Loper Bright Enterprises v. Raimondo

603 U.S. 369

• Court: Supreme Court of the United States
• Decided: June 28, 2024
• Docket: 22-451
• Status: Published

Opinion

PRELIMINARY PRINT

Volume 603 U. S. Part 1 Pages 369–479

OFFICIAL REPORTS OF

THE SUPREME COURT June 28, 2024

REBECCA A. WOMELDORF reporter of decisions

NOTICE: This preliminary print is subject to formal revision before the bound volume is published. Users are requested to notify the Reporter of Decisions, Supreme Court of the United States, Washington, D. C. 20543, pio@supremecourt.gov, of any typographical or other formal errors. OCTOBER TERM, 2023 369

Syllabus

LOPER BRIGHT ENTERPRISES et al. v. RAIMONDO, SECRETARY OF COMMERCE, et al.

certiorari to the united states court of appeals for the district of columbia circuit No. 22–451. Argued January 17, 2024—Decided June 28, 2024* The Court granted certiorari in these cases limited to the question whether Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837, should be overruled or clarifed. Under the Chevron doctrine, courts have sometimes been required to defer to “permissible” agency interpretations of the statutes those agencies administer—even when a reviewing court reads the statute differently. Id., at 843. In each case below, the reviewing courts applied Chevron's framework to resolve in favor of the Government challenges by petitioners to a rule promulgated by the National Marine Fisheries Service pursuant to the Magnuson-Stevens Act, 16 U. S. C. § 1801 et seq., which incorporates the Administrative Procedure Act (APA), 5 U. S. C. § 551 et seq. Held: The Administrative Procedure Act requires courts to exercise their Page independentProof judgment in Pending deciding whether an Publication agency has acted within its statutory authority, and courts may not defer to an agency interpre- tation of the law simply because a statute is ambiguous; Chevron is overruled. Pp. 384–413. (a) Article III of the Constitution assigns to the Federal Judiciary the responsibility and power to adjudicate “Cases” and “Controversies”— concrete disputes with consequences for the parties involved. The Framers appreciated that the laws judges would necessarily apply in resolving those disputes would not always be clear, but envisioned that the fnal “interpretation of the laws” would be “the proper and peculiar province of the courts.” The Federalist No. 78, p. 525 (A. Hamilton). As Chief Justice Marshall declared in the foundational decision of Mar- bury v. Madison, “[i]t is emphatically the province and duty of the judi- cial department to say what the law is.” 1 Cranch 137, 177. In the decades following Marbury, when the meaning of a statute was at issue, the judicial role was to “interpret the act of Congress, in order to ascer- tain the rights of the parties.” Decatur v. Paulding, 14 Pet. 497, 515.

*Together with No. 22–1219, Relentless, Inc., et al. v. Department of Commerce et al., on certiorari to the United States Court of Appeals for the First Circuit. 370 LOPER BRIGHT ENTERPRISES v. RAIMONDO

The Court recognized from the outset, though, that exercising inde- pendent judgment often included according due respect to Executive Branch interpretations of federal statutes. Such respect was thought especially warranted when an Executive Branch interpretation was is- sued roughly contemporaneously with enactment of the statute and re- mained consistent over time. The Court also gave “the most respect- ful consideration” to Executive Branch interpretations simply because “[t]he offcers concerned [were] usually able men, and masters of the subject,” who may well have drafted the laws at issue. United States v. Moore, 95 U. S. 760, 763. “Respect,” though, was just that. The views of the Executive Branch could inform the judgment of the Judi- ciary, but did not supersede it. “[I]n cases where [a court's] own judg- ment . . . differ[ed] from that of other high functionaries,” the court was “not at liberty to surrender, or to waive it.” United States v. Dickson, 15 Pet. 141, 162. During the “rapid expansion of the administrative process” that took place during the New Deal era, United States v. Morton Salt Co., 338 U. S. 632, 644, the Court often treated agency determinations of fact as binding on the courts, provided that there was “evidence to support the fndings,” St. Joseph Stock Yards Co. v. United States, 298 U. S. 38, 51. But the Court did not extend similar deference to agency resolutions of questions of law. “The interpretation of the meaning of statutes, as applied to justiciable controversies,” remained “exclusively a judicial function.” United States v. American Trucking Assns., Inc., 310 U. S. 534, 544. The Court also continued to note that the informed judgment of the Executive Branch could be entitled to “great weight.” Id., at 549. “The weight of such a judgment in a particular case,” the Court observed, would “depend upon the thoroughness evident in its consider- ation, the validity of its reasoning, its consistency with earlier and later pronouncements, and all those factors which give it power to persuade, if lacking power to control.” Skidmore v. Swift & Co., 323 U. S. 134, 140. Occasionally during this period, the Court applied deferential review after concluding that a particular statute empowered an agency to de- cide how a broad statutory term applied to specifc facts found by the agency. See Gray v. Powell, 314 U. S. 402; NLRB v. Hearst Publica- tions, Inc., 322 U. S. 111. But such deferential review, which the Court was far from consistent in applying, was cabined to factbound determi- nations. And the Court did not purport to refashion the longstanding judicial approach to questions of law. It instead proclaimed that “[u]n- doubtedly questions of statutory interpretation . . . are for the courts to resolve, giving appropriate weight to the judgment of those whose spe- cial duty is to administer the questioned statute.” Id., at 130–131. Cite as: 603 U. S. 369 (2024) 371

Nothing in the New Deal era or before it thus resembled the deference rule the Court would begin applying decades later to all varieties of agency interpretations of statutes under Chevron. Pp. 384–390. (b) Congress in 1946 enacted the APA “as a check upon administra- tors whose zeal might otherwise have carried them to excesses not con- templated in legislation creating their offces.” Morton Salt, 338 U. S., at 644. The APA prescribes procedures for agency action and delin- eates the basic contours of judicial review of such action. And it codi- fes for agency cases the unremarkable, yet elemental proposition re- fected by judicial practice dating back to Marbury: that courts decide legal questions by applying their own judgment. As relevant here, the APA specifes that courts, not agencies, will decide “all relevant ques- tions of law” arising on review of agency action, 5 U. S. C. § 706 (em- phasis added)—even those involving ambiguous laws. It prescribes no deferential standard for courts to employ in answering those legal questions, despite mandating deferential judicial review of agency poli- cymaking and factfnding. See §§ 706(2)(A), (E). And by directing courts to “interpret constitutional and statutory provisions” without dif- ferentiating between the two, § 706, it makes clear that agency interpre- tations of statutes—like agency interpretations of the Constitution—are not entitled to deference. The APA's history and the contemporaneous views of various respected commentators underscore the plain meaning of its text. Courts exercising independent judgment in determining the meaning of statutory provisions, consistent with the APA, may—as they have from the start—seek aid from the interpretations of those responsible for implementing particular statutes. See Skidmore, 323 U. S., at 140. And when the best reading of a statute is that it delegates discretionary authority to an agency, the role of the reviewing court under the APA is, as always, to independently interpret the statute and effectuate the will of Congress subject to constitutional limits. The court fulflls that role by recognizing constitutional delegations, fxing the boundaries of the delegated authority, and ensuring the agency has engaged in “ `rea- soned decisionmaking' ” within those boundaries. Michigan v. EPA, 576 U. S. 743, 750 (quoting Allentown Mack Sales & Service, Inc. v. NLRB, 522 U. S. 359, 374). By doing so, a court upholds the traditional conception of the judicial function that the APA adopts. Pp. 391–396. (c) The deference that Chevron requires of courts reviewing agency action cannot be squared with the APA. Pp. 396–407. (1) Chevron, decided in 1984 by a bare quorum of six Justices, trig- gered a marked departure from the traditional judicial approach of inde- pendently examining each statute to determine its meaning. The ques- tion in the case was whether an Environmental Protection Agency 372 LOPER BRIGHT ENTERPRISES v. RAIMONDO

(EPA) regulation was consistent with the term “stationary source” as used in the Clean Air Act. 467 U. S., at 840. To answer that question, the Court articulated and employed a now familiar two-step approach broadly applicable to review of agency action. The frst step was to discern “whether Congress ha[d] directly spoken to the precise question at issue.” Id., at 842. The Court explained that “[i]f the intent of Con- gress is clear, that is the end of the matter,” ibid., and courts were therefore to “reject administrative constructions which are contrary to clear congressional intent,” id., at 843, n. 9. But in a case in which “the statute [was] silent or ambiguous with respect to the specifc issue” at hand, a reviewing court could not “simply impose its own construction on the statute, as would be necessary in the absence of an administrative interpretation.” Id., at 843 (footnote omitted). Instead, at Chevron's second step, a court had to defer to the agency if it had offered “a per- missible construction of the statute,” ibid., even if not “the reading the court would have reached if the question initially had arisen in a judicial proceeding,” ibid., n. 11. Employing this new test, the Court concluded that Congress had not addressed the question at issue with the neces- sary “level of specifcity” and that EPA's interpretation was “entitled to deference.” Id., at 865. Although the Court did not at frst treat Chevron as the watershed decision it was fated to become, the Court and the courts of appeals were soon routinely invoking its framework as the governing standard in cases involving statutory questions of agency authority. The Court eventually decided that Chevron rested on “a presumption that Con- gress, when it left ambiguity in a statute meant for implementation by an agency, understood that the ambiguity would be resolved, frst and foremost, by the agency, and desired the agency (rather than the courts) to possess whatever degree of discretion the ambiguity allows.” Smi- ley v. Citibank (South Dakota), N. A., 517 U. S. 735, 740–741. Pp. 396–398. (2) Neither Chevron nor any subsequent decision of the Court at- tempted to reconcile its framework with the APA. Chevron defes the command of the APA that “the reviewing court”—not the agency whose action it reviews—is to “decide all relevant questions of law” and “inter- pret . . . statutory provisions.” § 706 (emphasis added). It requires a court to ignore, not follow, “the reading the court would have reached” had it exercised its independent judgment as required by the APA. Chevron, 467 U. S., at 843, n. 11. Chevron insists on more than the “respect” historically given to Executive Branch interpretations; it de- mands that courts mechanically afford binding deference to agency in- terpretations, including those that have been inconsistent over time, see id., at 863, and even when a pre-existing judicial precedent holds that Cite as: 603 U. S. 369 (2024) 373

an ambiguous statute means something else, National Cable & Telecom- munications Assn. v. Brand X Internet Services, 545 U. S. 967, 982. That regime is the antithesis of the time honored approach the APA prescribes. Chevron cannot be reconciled with the APA by presuming that statu- tory ambiguities are implicit delegations to agencies. That presump- tion does not approximate reality. A statutory ambiguity does not nec- essarily refect a congressional intent that an agency, as opposed to a court, resolve the resulting interpretive question. Many or perhaps most statutory ambiguities may be unintentional. And when courts confront statutory ambiguities in cases that do not involve agency inter- pretations or delegations of authority, they are not somehow relieved of their obligation to independently interpret the statutes. Instead of declaring a particular party's reading “permissible” in such a case, courts use every tool at their disposal to determine the best reading of the statute and resolve the ambiguity. But in an agency case as in any other, there is a best reading all the same—“the reading the court would have reached” if no agency were involved. Chevron, 467 U. S., at 843, n. 11. It therefore makes no sense to speak of a “permissible” interpre- tation that is not the one the court, after applying all relevant interpre- tive tools, concludes is best. Perhaps most fundamentally, Chevron's presumption is misguided be- cause agencies have no special competence in resolving statutory ambi- guities. Courts do. The Framers anticipated that courts would often confront statutory ambiguities and expected that courts would resolve them by exercising independent legal judgment. Chevron gravely erred in concluding that the inquiry is fundamentally different just be- cause an administrative interpretation is in play. The very point of the traditional tools of statutory construction is to resolve statutory ambiguities. That is no less true when the ambiguity is about the scope of an agency's own power—perhaps the occasion on which abdication in favor of the agency is least appropriate. Pp. 398–401. (3) The Government responds that Congress must generally intend for agencies to resolve statutory ambiguities because agencies have sub- ject matter expertise regarding the statutes they administer; because deferring to agencies purportedly promotes the uniform construction of federal law; and because resolving statutory ambiguities can involve policymaking best left to political actors, rather than courts. See Brief for Respondents in No. 22–1219, pp. 16–19. But none of these con- siderations justifes Chevron's sweeping presumption of congressional intent. As the Court recently noted, interpretive issues arising in connection with a regulatory scheme “may fall more naturally into a judge's baili- 374 LOPER BRIGHT ENTERPRISES v. RAIMONDO

wick” than an agency's. Kisor v. Wilkie, 588 U. S. 558, 578. Under Chevron's broad rule of deference, though, ambiguities of all stripes trigger deference, even in cases having little to do with an agency's technical subject matter expertise. And even when an ambiguity hap- pens to implicate a technical matter, it does not follow that Congress has taken the power to authoritatively interpret the statute from the courts and given it to the agency. Congress expects courts to handle technical statutory questions, and courts did so without issue in agency cases before Chevron. After all, in an agency case in particular, the reviewing court will go about its task with the agency's “body of experi- ence and informed judgment,” among other information, at its disposal. Skidmore, 323 U. S., at 140. An agency's interpretation of a statute “cannot bind a court,” but may be especially informative “to the extent it rests on factual premises within [the agency's] expertise.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S. 89, 98, n. 8. Dele- gating ultimate interpretive authority to agencies is simply not neces- sary to ensure that the resolution of statutory ambiguities is well in- formed by subject matter expertise. Nor does a desire for the uniform construction of federal law justify Chevron. It is unclear how much the Chevron doctrine as a whole actu- ally promotes such uniformity, and in any event, we see no reason to presume that Congress prefers uniformity for uniformity's sake over the correct interpretation of the laws it enacts. Finally, the view that interpretation of ambiguous statutory provi- sions amounts to policymaking suited for political actors rather than courts is especially mistaken because it rests on a profound misconcep- tion of the judicial role. Resolution of statutory ambiguities involves legal interpretation, and that task does not suddenly become policymak- ing just because a court has an “agency to fall back on.” Kisor, 588 U. S., at 575. Courts interpret statutes, no matter the context, based on the traditional tools of statutory construction, not individual policy preferences. To stay out of discretionary policymaking left to the polit- ical branches, judges need only fulfll their obligations under the APA to independently identify and respect such delegations of authority, po- lice the outer statutory boundaries of those delegations, and ensure that agencies exercise their discretion consistent with the APA. By forcing courts to instead pretend that ambiguities are necessarily delegations, Chevron prevents judges from judging. Pp. 401–404. (4) Because Chevron's justifying presumption is, as Members of the Court have often recognized, a fction, the Court has spent the better part of four decades imposing one limitation on Chevron after another. Confronted with the byzantine set of preconditions and exceptions that has resulted, some courts have simply bypassed Chevron or failed to Cite as: 603 U. S. 369 (2024) 375

heed its various steps and nuances. The Court, for its part, has not deferred to an agency interpretation under Chevron since 2016. But because Chevron remains on the books, litigants must continue to wres- tle with it, and lower courts—bound by even the Court's crumbling prec- edents—understandably continue to apply it. At best, Chevron has been a distraction from the question that matters: Does the statute au- thorize the challenged agency action? And at worst, it has required courts to violate the APA by yielding to an agency the express responsi- bility, vested in “the reviewing court,” to “decide all relevant questions of law” and “interpret . . . statutory provisions.” § 706 (emphasis added). Pp. 404–407. (d) Stare decisis, the doctrine governing judicial adherence to prece- dent, does not require the Court to persist in the Chevron project. The stare decisis considerations most relevant here—“the quality of [the precedent's] reasoning, the workability of the rule it established, . . . and reliance on the decision,” Knick v. Township of Scott, 588 U. S. 180, 203 (quoting Janus v. State, County, and Municipal Employees, 585 U. S. 878, 917)—all weigh in favor of letting Chevron go. Chevron has proved to be fundamentally misguided. It reshaped ju- dicial review of agency action without grappling with the APA, the stat-

ute that lays out how such review works. And its faws were apparent from the start, prompting the Court to revise its foundations and contin- ually limit its application. Experience has also shown that Chevron is unworkable. The defn- ing feature of its framework is the identifcation of statutory ambiguity, but the concept of ambiguity has always evaded meaningful defnition. Such an impressionistic and malleable concept “cannot stand as an every-day test for allocating” interpretive authority between courts and agencies. Swift & Co. v. Wickham, 382 U. S. 111, 125. The Court has also been forced to clarify the doctrine again and again, only adding to Chevron's unworkability, and the doctrine continues to spawn diffcult threshold questions that promise to further complicate the inquiry should Chevron be retained. And its continuing import is far from clear, as courts have often declined to engage with the doctrine, saying it makes no difference. Nor has Chevron fostered meaningful reliance. Given the Court's constant tinkering with and eventual turn away from Chevron, it is hard to see how anyone could reasonably expect a court to rely on Chevron in any particular case or expect it to produce readily foreseeable outcomes. And rather than safeguarding reliance interests, Chevron affrmatively destroys them by allowing agencies to change course even when Con- gress has given them no power to do so. 376 LOPER BRIGHT ENTERPRISES v. RAIMONDO

The only way to “ensure that the law will not merely change errati- cally, but will develop in a principled and intelligible fashion,” Vasquez v. Hillery, 474 U. S. 254, 265, is for the Court to leave Chevron behind. By overruling Chevron, though, the Court does not call into question prior cases that relied on the Chevron framework. The holdings of those cases that specifc agency actions are lawful—including the Clean Air Act holding of Chevron itself—are still subject to statutory stare decisis despite the Court's change in interpretive methodology. See CBOCS West, Inc. v. Humphries, 553 U. S. 442, 457. Mere reliance on Chevron cannot constitute a “ `special justifcation' ” for overruling such a holding. Halliburton Co. v. Erica P. John Fund, Inc., 573 U. S. 258, 266 (quoting Dickerson v. United States, 530 U. S. 428, 443). Pp. 407–412. No. 22–451, 45 F. 4th 359; and No. 22–1219, 62 F. 4th 621, vacated and remanded.

Roberts, C. J., delivered the opinion of the Court, in which Thomas, Alito, Gorsuch, Kavanaugh, and Barrett, JJ., joined. Thomas, J., post, p. 413, and Gorsuch, J., post, p. 416, fled concurring opinions. Kagan, J., fled a dissenting opinion, in which Sotomayor, J., joined, and in which Jackson, J., joined as it applies to No. 22–1219, post, p. 448. Jackson, J., took no part in the consideration or decision of the case in No. 22–451.

Paul D. Clement argued the cause for petitioners. With him on the briefs were Andrew C. Lawrence, Ryan P. Mul- vey, Eric R. Bolinder, and R. James Valvo III. Solicitor General Prelogar argued the cause for respond- ents. With her on the brief were Assistant Attorney Gen- eral Kim, Deputy Solicitor General Kneedler, Matthew Guarnieri, Rachel Heron, and Dina B. Mishra.†

†Briefs of amici curiae urging reversal were fled for the State of West Virginia et al. by Lindsay S. See, Solicitor General of West Virginia, Pat- rick Morrisey, Attorney General, Michael R. Williams, Principal Deputy Solicitor General, and Grant A. Newman, Assistant Solicitor General, by Angela Colmenero, Provisional Attorney General of Texas, and by the At- torneys General for their respective States as follows: Steve Marshall of Al- abama, Treg Taylor of Alaska, Tim Griffn of Arkansas, Ashley Moody of Florida, Chris Carr of Georgia, Raúl Labrador of Idaho, Theodore E. Rok- ita of Indiana, Brenna Bird of Iowa, Kris Kobach of Kansas, Daniel Cam- eron of Kentucky, Jeff Landry of Louisiana, Lynn Fitch of Mississippi, Andrew Bailey of Missouri, Austin Knudsen of Montana, Michael T. Hil- Cite as: 603 U. S. 369 (2024) 377

Opinion of the Court

Chief Justice Roberts delivered the opinion of the Court. Since our decision in Chevron U. S. A. Inc. v. Natural Re- sources Defense Council, Inc., 467 U. S. 837 (1984), we have

gers of Nebraska, John M. Formella of New Hampshire, Drew Wrigley of North Dakota, Dave Yost of Ohio, Gentner Drummond of Oklahoma, Alan Wilson of South Carolina, Marty Jackley of South Dakota, Jonathan Skrmetti of Tennessee, Sean D. Reyes of Utah, Jason Miyares of Virginia, and Bridget Hill of Wyoming; for the Advance Colorado Institute by Kris- tine L. Brown; for Advancing American Freedom et al. by J. Marc Wheat; for the America First Legal Foundation by Christopher E. Mills, Gene P. Hamilton, and Reed D. Rubinstein; for the America First Policy Insti- tute by Matthew J. Conigliaro, Jessica Hart Steinmann, and Richard P. Lawson; for the American Center for Law and Justice by Jay Alan Sekulow, Stuart J. Roth, Jordan A. Sekulow, Colby M. May, and Laura B. Hernandez; for the American Cornerstone Institute by Edward M. Wenger, Andrew Pardue, and Kenneth C. Daines; for The Buckeye Insti- tute et al. by David C. Tryon and Elizabeth Milito; for the Cato Institute et al. by Anastasia P. Boden, Thomas A. Berry, and Curt A. Levey; for the Center for Constitutional Jurisprudence by John C. Eastman and An- thony T. Caso; for the Chamber of Commerce of the United States of America by Helgi C. Walker, Russell B. Balikian, Daryl L. Joseffer, and Andrew R. Varcoe; for the Christian Employers Alliance by Matthew S. Bowman, Julie Marie Blake, John J. Bursch, James A. Campbell, and Erin Morrow Hawley; for the Competitive Enterprise Institute by Dan Greenberg; for the DRI Center for Law and Public Policy by Melinda S. Kollross and Don R. Sampen; for Eight National Business Organizations by Timothy S. Bishop, Brett E. Legner, Richard Gupton, Ellen Steen, Travis Cushman, and Michael C. Formica; for the Foundation for Govern- ment Accountability by Stewart L. Whitson; for the FPC Action Founda- tion et al. by Joseph G. S. Greenlee and Cody J. Wisniewski; for the Gold- water Institute by Timothy Sandefur; for Gun Owners of America, Inc., et al. by William J. Olson, Jeremiah L. Morgan, Robert J. Olson, and John I. Harris III; for the Independent Women's Law Center et al. by Kathryn E. Tarbert, Gene C. Schaerr, Cory L. Andrews, and John M. Mas- slon II; for the Landmark Legal Foundation by Michael J. O'Neill, Mat- thew C. Forys, and Richard P. Hutchison; for the Liberty Justice Center by Loren A. Seehase; for the Little Sisters of the Poor Saints Peter and Paul Home by Eric C. Rassbach and William J. Haun; for the Manhattan Institute et al. by Ilya Shapiro; for the Mountain States Legal Foundation by Ivan L. London and David C. McDonald; for the National Right to 378 LOPER BRIGHT ENTERPRISES v. RAIMONDO

sometimes required courts to defer to “permissible” agency interpretations of the statutes those agencies administer— even when a reviewing court reads the statute differently. In these cases we consider whether that doctrine should be overruled.

Work Legal Defense Foundation, Inc., by W. James Young; for the Na- tional Sports Shooting Foundation, Inc., by H. Christopher Bartolomucci, Brian J. Field, and Kenneth A. Klukowski; for the National Taxpayers Union Foundation by Joseph D. Henchman and Tyler Martinez; for the New Civil Liberties Alliance by John J. Vecchione, Mark Chenoweth, and Kara Rollins; for the New England Legal Foundation by Benjamin G. Robbins and Daniel B. Winslow; for the Ohio Chamber of Commerce by Larry J. Obhof, Jr.; for the Pacifc Legal Foundation by Aditya Dynar; for the Southeastern Legal Foundation et al. by Thomas R. McCarthy, J. Michael Connolly, Braden H. Boucek, Kimberly S. Hermann, Karen Harned, Robert Henneke, Chance Weldon, and Donald A. Daugherty, Jr.; for Strive Asset Management by Jonathan Berry; for TechFreedom by Corbin K. Barthold; for the U. S. House of Representatives by Matthew B. Berry, Todd B. Tatelman, Brooks M. Hanner, and Sarah E. Clouse; for Sen. Ted Cruz et al. by Jennifer L. Mascott and R. Trent McCotter; for David Goethel et al. by Andrew M. Grossman; and for Gov. Brian P. Kemp by David B. Dove. Briefs of amici curiae urging vacatur were fled for the American Free Enterprise Chamber of Commerce by Steven A. Engel, Michael H. McGinley, and William P. Barr; and for the Third Party Pay- ment Processors Association by Misha Tseytlin, Kevin M. LeRoy, and Sean T. H. Dutton. Briefs of amici curiae urging affrmance were fled for Administrative and Federal Regulatory Law Professors by Daniel M. Sullivan and Brian T. Goldman; for the American Association for the Advancement of Science et al. by D. Alicia Hickok; for the American Federation of Labor and Congress of Industrial Organizations by Harold C. Becker, Matthew Gins- burg, and Andrew Lyubarsky; for the Conservation Law Foundation et al. by Kirti Datla and Andrea A. Treece; for the Environmental Defense Fund by Sean H. Donahue, David T. Goldberg, Megan M. Herzog, Vickie L. Patton, and Peter Zalzal; for the Lawyers' Committee for Civil Rights Under Law by James P. McLoughlin, Jr., Mary Katherine Stukes, Pierce Werner, Damon Hewitt, Jon Greenbaum, and Thomas Silverstein; for PTAAARMIGAN, LLC, et al. by David E. Boundy; for Public Citizen by Scott L. Nelson and Allison M. Zieve; for Small Business Associations by Jeffrey B. Dubner, Kaitlyn Golden, and Skye L. Perryman; for Thomas Cite as: 603 U. S. 369 (2024) 379

I Our Chevron doctrine requires courts to use a two-step framework to interpret statutes administered by federal agencies. After determining that a case satisfes the vari- ous preconditions we have set for Chevron to apply, a review- ing court must frst assess “whether Congress has directly spoken to the precise question at issue.” Id., at 842. If, and only if, congressional intent is “clear,” that is the end of the inquiry. Ibid. But if the court determines that “the statute is silent or ambiguous with respect to the specifc issue” at hand, the court must, at Chevron's second step, defer to the agency's interpretation if it “is based on a per-

W. Merrill by Joseph D. Kearney; and for Sen. Sheldon Whitehouse et al. by Erwin Chemerinsky. Briefs of amici curiae were fled for the District of Columbia et al. by Brian L. Schwalb, Attorney General of the District of Columbia, Caroline S. Van Zile, Solicitor General, Ashwin P. Phatak, Principal Deputy Solici- tor General, and Alexandra Lichtenstein, Assistant Attorney General, and by the Attorneys General for their respective States as follows: Rob Bonta of California, Philip J. Weiser of Colorado, William Tong of Connecticut, Kathleen Jennings of Delaware, Anne E. Lopez of Hawaii, Kwame Raoul of Illinois, Anthony G. Brown of Maryland, Andrea Joy Campbell of Mas- sachusetts, Dana Nessel of Michigan, Keith Ellison of Minnesota, Aaron D. Ford of Nevada, Matthew J. Platkin of New Jersey, Raúl Torrez of New Mexico, Letitia James of New York, Joshua H. Stein of North Caro- lina, Ellen F. Rosenblum of Oregon, Michelle A. Henry of Pennsylvania, Peter F. Neronha of Rhode Island, Charity R. Clark of Vermont, Robert W. Ferguson of Washington, and Joshua L. Kaul of Wisconsin; for the American Cancer Society et al. by Scott P. Lewis, Mary Rouvelas, and Jane Perkins; for the Atlantic Legal Foundation by Lawrence S. Ebner and Herbert L. Fenster; for the Coalition for a Democratic Workplace et al. by Elbert Lin and Kurt G. Larkin; for the Electronic Nicotine Delivery System Industry Stakeholders by Eric P. Gotting, Azim Chowdhury, and J. Gregory Troutman; for the LONANG Institute by Kerry Lee Morgan and Randall A. Pentiuk; for the Natural Resources Defense Council by Ian Fein and David Doniger; for Scholars of Administrative Law et al. by Elizabeth B. Wydra and Brianne J. Gorod; for Aditya Bamzai, pro se; and for Kent Barnett et al. by Christopher J. Walker, pro se. 380 LOPER BRIGHT ENTERPRISES v. RAIMONDO

missible construction of the statute.” Id., at 843. The re- viewing courts in each of the cases before us applied Chev- ron's framework to resolve in favor of the Government chal- lenges to the same agency rule.

A Before 1976, unregulated foreign vessels dominated fshing in the international waters off the U. S. coast, which began just 12 nautical miles offshore. See, e. g., S. Rep. No. 94– 459, pp. 2–3 (1975). Recognizing the resultant overfshing and the need for sound management of fshery resources, Congress enacted the Magnuson-Stevens Fishery Conserva- tion and Management Act (MSA). See 90 Stat. 331 (codifed as amended at 16 U. S. C. § 1801 et seq.). The MSA and sub- sequent amendments extended the jurisdiction of the United States to 200 nautical miles beyond the U. S. territorial sea and claimed “exclusive fshery management authority over all fsh” within that area, known as the “exclusive economic zone.” § 1811(a); see Presidential Proclamation No. 5030, 3 CFR 22 (1983 Comp.); §§ 101, 102, 90 Stat. 336. The National Marine Fisheries Service (NMFS) administers the MSA under a delegation from the Secretary of Commerce. The MSA established eight regional fshery management councils composed of representatives from the coastal States, fshery stakeholders, and NMFS. See 16 U. S. C. §§ 1852(a), (b). The councils develop fshery management plans, which NMFS approves and promulgates as fnal regulations. See §§ 1852(h), 1854(a). In service of the statute's fshery con- servation and management goals, see § 1851(a), the MSA re- quires that certain provisions—such as “a mechanism for specifying annual catch limits . . . at a level such that over- fshing does not occur,” § 1853(a)(15)—be included in these plans, see § 1853(a). The plans may also include additional discretionary provisions. See § 1853(b). For example, plans may “prohibit, limit, condition, or require the use of Cite as: 603 U. S. 369 (2024) 381

specifed types and quantities of fshing gear, fshing vessels, or equipment,” § 1853(b)(4); “reserve a portion of the allow- able biological catch of the fshery for use in scientifc re- search,” § 1853(b)(11); and “prescribe such other measures, requirements, or conditions and restrictions as are deter- mined to be necessary and appropriate for the conservation and management of the fshery,” § 1853(b)(14). Relevant here, a plan may also require that “one or more observers be carried on board” domestic vessels “for the pur- pose of collecting data necessary for the conservation and management of the fshery.” § 1853(b)(8). The MSA speci- fes three groups that must cover costs associated with ob- servers: (1) foreign fshing vessels operating within the ex- clusive economic zone (which must carry observers), see §§ 1821(h)(1)(A), (h)(4), (h)(6); (2) vessels participating in cer- tain limited access privilege programs, which impose quotas permitting fshermen to harvest only specifc quantities of a fshery's total allowable catch, see §§ 1802(26), 1853a(c)(1)(H), (e)(2), 1854(d)(2); and (3) vessels within the jurisdiction of the North Pacifc Council, where many of the largest and most successful commercial fshing enterprises in the Nation oper- ate, see § 1862(a). In the latter two cases, the MSA ex- pressly caps the relevant fees at two or three percent of the value of fsh harvested on the vessels. See §§ 1854(d)(2)(B), 1862(b)(2)(E). And in general, it authorizes the Secretary to impose “sanctions” when “any payment required for ob- server services provided to or contracted by an owner or operator . . . has not been paid.” § 1858(g)(1)(D). The MSA does not contain similar terms addressing whether Atlantic herring fshermen may be required to bear costs associated with any observers a plan may mandate. And at one point, NMFS fully funded the observer coverage the New England Fishery Management Council required in its plan for the Atlantic herring fshery. See 79 Fed. Reg. 8792 (2014). In 2013, however, the council proposed amend- ing its fshery management plans to empower it to require 382 LOPER BRIGHT ENTERPRISES v. RAIMONDO

fshermen to pay for observers if federal funding became un- available. Several years later, NMFS promulgated a rule approving the amendment. See 85 Fed. Reg. 7414 (2020). With respect to the Atlantic herring fshery, the Rule cre- ated an industry funded program that aims to ensure ob- server coverage on 50 percent of trips undertaken by vessels with certain types of permits. Under that program, vessel representatives must “declare into” a fshery before begin- ning a trip by notifying NMFS of the trip and announcing the species the vessel intends to harvest. If NMFS deter- mines that an observer is required, but declines to assign a Government-paid one, the vessel must contract with and pay for a Government-certifed third-party observer. NMFS es- timated that the cost of such an observer would be up to $710 per day, reducing annual returns to the vessel owner by up to 20 percent. See id., at 7417–7418.

B Petitioners Loper Bright Enterprises, Inc., H&L Axels- son, Inc., Lund Marr Trawlers LLC, and Scombrus One LLC are family businesses that operate in the Atlantic herring fshery. In February 2020, they challenged the Rule under the MSA, 16 U. S. C. § 1855(f), which incorporates the Admin- istrative Procedure Act (APA), 5 U. S. C. § 551 et seq. In relevant part, they argued that the MSA does not authorize NMFS to mandate that they pay for observers required by a fshery management plan. The District Court granted summary judgment to the Government. It concluded that the MSA authorized the Rule, but noted that even if these petitioners' “arguments were enough to raise an ambiguity in the statutory text,” deference to the agency's interpreta- tion would be warranted under Chevron. 544 F. Supp. 3d 82, 107 (DC 2021); see id., at 103–107. A divided panel of the D. C. Circuit affrmed. See 45 F. 4th 359 (2022). The majority addressed various provi- sions of the MSA and concluded that it was not “wholly un- Cite as: 603 U. S. 369 (2024) 383

ambiguous” whether NMFS may require Atlantic herring fshermen to pay for observers. Id., at 366. Because there remained “some question” as to Congress's intent, id., at 369, the court proceeded to Chevron's second step and deferred to the agency's interpretation as a “reasonable” construction of the MSA, 45 F. 4th, at 370. In dissent, Judge Walker concluded that Congress's silence on industry funded observ- ers for the Atlantic herring fshery—coupled with the ex- press provision for such observers in other fsheries and on foreign vessels—unambiguously indicated that NMFS lacked the authority to “require [Atlantic herring] fshermen to pay the wages of at-sea monitors.” Id., at 375.

C Petitioners Relentless Inc., Huntress Inc., and Seafreeze Fleet LLC own two vessels that operate in the Atlantic her- ring fshery: the F/V Relentless and the F/V Persistence.1 These vessels use small-mesh bottom-trawl gear and can freeze fsh at sea, so they can catch more species of fsh and take longer trips than other vessels (about 10 to 14 days, as opposed to the more typical 2 to 4). As a result, they gener- ally declare into multiple fsheries per trip so they can catch whatever the ocean offers up. If the vessels declare into the Atlantic herring fshery for a particular trip, they must carry an observer for that trip if NMFS selects the trip for cover- age, even if they end up harvesting fewer herring than other vessels—or no herring at all. This set of petitioners, like those in the D. C. Circuit case, fled a suit challenging the Rule as unauthorized by the MSA. The District Court, like the D. C. Circuit, deferred to NMFS's contrary interpretation under Chevron and thus granted summary judgment to the Government. See 561 F. Supp. 3d 226, 234–238 (RI 2021).

1 For any landlubbers, “F/V” is simply the designation for a fshing vessel. 384 LOPER BRIGHT ENTERPRISES v. RAIMONDO

The First Circuit affrmed. See 62 F. 4th 621 (2023). It relied on a “default norm” that regulated entities must bear compliance costs, as well as the MSA's sanctions provision, Section 1858(g)(1)(D). See id., at 629–631. And it rejected petitioners' argument that the express statutory authoriza- tion of three industry funding programs demonstrated that NMFS lacked the broad implicit authority it asserted to im- pose such a program for the Atlantic herring fshery. See id., at 631–633. The court ultimately concluded that the “[a]gency's interpretation of its authority to require at-sea monitors who are paid for by owners of regulated vessels does not `exceed[ ] the bounds of the permissible.' ” Id., at 633–634 (quoting Barnhart v. Walton, 535 U. S. 212, 218 (2002); alteration in original). In reaching that conclusion, the First Circuit stated that it was applying Chevron's two- step framework. 62 F. 4th, at 628. But it did not explain which aspects of its analysis were relevant to which of Chev- ron's two steps. Similarly, it declined to decide whether the result was “a product of Chevron step one or step two.” Id., at 634. We granted certiorari in both cases, limited to the question whether Chevron should be overruled or clarifed. See 601 U. S. 883 (2023); 598 U. S. 1270 (2023).2

II A Article III of the Constitution assigns to the Federal Judi- ciary the responsibility and power to adjudicate “Cases” and “Controversies”—concrete disputes with consequences for the parties involved. The Framers appreciated that the laws judges would necessarily apply in resolving those dis-

2 Both petitions also presented questions regarding the consistency of the Rule with the MSA. See Pet. for Cert. in No. 22–451, p. i; Pet. for Cert. in No. 22–1219, p. ii. We did not grant certiorari with respect to those questions and thus do not reach them. Cite as: 603 U. S. 369 (2024) 385

putes would not always be clear. Cognizant of the limits of human language and foresight, they anticipated that “[a]ll new laws, though penned with the greatest technical skill, and passed on the fullest and most mature deliberation,” would be “more or less obscure and equivocal, until their meaning” was settled “by a series of particular discussions and adjudications.” The Federalist No. 37, p. 236 (J. Cooke ed. 1961) (J. Madison). The Framers also envisioned that the fnal “interpretation of the laws” would be “the proper and peculiar province of the courts.” Id., No. 78, at 525 (A. Hamilton). Unlike the political branches, the courts would by design exercise “nei- ther Force nor Will, but merely judgment.” Id., at 523. To ensure the “steady, upright and impartial administration of the laws,” the Framers structured the Constitution to allow judges to exercise that judgment independent of infuence from the political branches. Id., at 522; see id., at 522–524; Stern v. Marshall, 564 U. S. 462, 484 (2011). This Court embraced the Framers' understanding of the judicial function early on. In the foundational decision of Marbury v. Madison, Chief Justice Marshall famously de- clared that “[i]t is emphatically the province and duty of the judicial department to say what the law is.” 1 Cranch 137, 177 (1803). And in the following decades, the Court under- stood “interpret[ing] the laws, in the last resort,” to be a “solemn duty” of the Judiciary. United States v. Dickson, 15 Pet. 141, 162 (1841) (Story, J., for the Court). When the meaning of a statute was at issue, the judicial role was to “interpret the act of Congress, in order to ascertain the rights of the parties.” Decatur v. Paulding, 14 Pet. 497, 515 (1840). The Court also recognized from the outset, though, that exercising independent judgment often included according due respect to Executive Branch interpretations of federal statutes. For example, in Edwards' Lessee v. Darby, 12 Wheat. 206 (1827), the Court explained that “[i]n the con- 386 LOPER BRIGHT ENTERPRISES v. RAIMONDO

struction of a doubtful and ambiguous law, the contempora- neous construction of those who were called upon to act under the law, and were appointed to carry its provisions into effect, is entitled to very great respect.” Id., at 210; see also United States v. Vowell, 5 Cranch 368, 372 (1809) (Marshall, C. J., for the Court). Such respect was thought especially warranted when an Executive Branch interpretation was issued roughly contem- poraneously with enactment of the statute and remained con- sistent over time. See Dickson, 15 Pet., at 161; United States v. Alabama Great Southern R. Co., 142 U. S. 615, 621 (1892); National Lead Co. v. United States, 252 U. S. 140, 145–146 (1920). That is because “the longstanding `practice of the government' ”—like any other interpretive aid—“can inform [a court's] determination of `what the law is. ' ” NLRB v. Noel Canning, 573 U. S. 513, 525 (2014) (frst quot- ing McCulloch v. Maryland, 4 Wheat. 316, 401 (1819); then quoting Marbury, 1 Cranch, at 177). The Court also gave “the most respectful consideration” to Executive Branch in- terpretations simply because “[t]he offcers concerned [were] usually able men, and masters of the subject,” who were “[n]ot unfrequently . . . the draftsmen of the laws they [were] afterwards called upon to interpret.” United States v. Moore, 95 U. S. 760, 763 (1878); see also Jacobs v. Prichard, 223 U. S. 200, 214 (1912). “Respect,” though, was just that. The views of the Exec- utive Branch could inform the judgment of the Judiciary, but did not supersede it. Whatever respect an Executive Branch interpretation was due, a judge “certainly would not be bound to adopt the construction given by the head of a department.” Decatur, 14 Pet., at 515; see also Burnet v. Chicago Portrait Co., 285 U. S. 1, 16 (1932). Otherwise, judi- cial judgment would not be independent at all. As Justice Story put it, “in cases where [a court's] own judgment . . . differ[ed] from that of other high functionaries,” the court Cite as: 603 U. S. 369 (2024) 387

was “not at liberty to surrender, or to waive it.” Dickson, 15 Pet., at 162. B The New Deal ushered in a “rapid expansion of the admin- istrative process.” United States v. Morton Salt Co., 338 U. S. 632, 644 (1950). But as new agencies with new powers proliferated, the Court continued to adhere to the traditional understanding that questions of law were for courts to de- cide, exercising independent judgment. During this period, the Court often treated agency deter- minations of fact as binding on the courts, provided that there was “evidence to support the fndings.” St. Joseph Stock Yards Co. v. United States, 298 U. S. 38, 51 (1936). “When the legislature itself acts within the broad feld of legislative discretion,” the Court reasoned, “its determina- tions are conclusive.” Ibid. Congress could therefore “appoint[ ] an agent to act within that sphere of legisla- tive authority” and “endow the agent with power to make fndings of fact which are conclusive, provided the require- ments of due process which are specially applicable to such an agency are met, as in according a fair hearing and act- ing upon evidence and not arbitrarily.” Ibid. (emphasis added). But the Court did not extend similar deference to agency resolutions of questions of law. It instead made clear, re- peatedly, that “[t]he interpretation of the meaning of stat- utes, as applied to justiciable controversies,” was “exclu- sively a judicial function.” United States v. American Trucking Assns., Inc., 310 U. S. 534, 544 (1940); see also So- cial Security Bd. v. Nierotko, 327 U. S. 358, 369 (1946); Medo Photo Supply Corp. v. NLRB, 321 U. S. 678, 681–682, n. 1 (1944). The Court understood, in the words of Justice Bran- deis, that “[t]he supremacy of law demands that there shall be opportunity to have some court decide whether an errone- ous rule of law was applied.” St. Joseph Stock Yards, 298 388 LOPER BRIGHT ENTERPRISES v. RAIMONDO

U. S., at 84 (concurring opinion). It also continued to note, as it long had, that the informed judgment of the Executive Branch—especially in the form of an interpretation issued contemporaneously with the enactment of the statute—could be entitled to “great weight.” American Trucking Assns., 310 U. S., at 549. Perhaps most notably along those lines, in Skidmore v. Swift & Co., 323 U. S. 134 (1944), the Court explained that the “interpretations and opinions” of the relevant agency, “made in pursuance of offcial duty” and “based upon . . . specialized experience,” “constitute[d] a body of experience and informed judgment to which courts and litigants [could] properly resort for guidance,” even on legal questions. Id., at 139–140. “The weight of such a judgment in a particular case,” the Court observed, would “depend upon the thor- oughness evident in its consideration, the validity of its rea- soning, its consistency with earlier and later pronounce- ments, and all those factors which give it power to persuade, if lacking power to control.” Id., at 140. On occasion, to be sure, the Court applied deferential re- view upon concluding that a particular statute empowered an agency to decide how a broad statutory term applied to specifc facts found by the agency. For example, in Gray v. Powell, 314 U. S. 402 (1941), the Court deferred to an admin- istrative conclusion that a coal-burning railroad that had ar- rangements with several coal mines was not a coal “pro- ducer” under the Bituminous Coal Act of 1937. Congress had “specifcally” granted the agency the authority to make that determination. Id., at 411. The Court thus reasoned that “[w]here, as here, a determination has been left to an administrative body, this delegation will be respected and the administrative conclusion left untouched” so long as the agency's decision constituted “a sensible exercise of judg- ment.” Id., at 412–413. Similarly, in NLRB v. Hearst Pub- lications, Inc., 322 U. S. 111 (1944), the Court deferred to the determination of the National Labor Relations Board that Cite as: 603 U. S. 369 (2024) 389

newsboys were “employee[s]” within the meaning of the Na- tional Labor Relations Act. The Act had, in the Court's judgment, “assigned primarily” to the Board the task of marking a “defnitive limitation around the term `em- ployee.' ” Id., at 130. The Court accordingly viewed its own role as “limited” to assessing whether the Board's deter- mination had a “ `warrant in the record' and a reasonable basis in law.” Id., at 131. Such deferential review, though, was cabined to factbound determinations like those at issue in Gray and Hearst. Nei- ther Gray nor Hearst purported to refashion the longstand- ing judicial approach to questions of law. In Gray, after de- ferring to the agency's determination that a particular entity was not a “producer” of coal, the Court went on to discern, based on its own reading of the text, whether another statu- tory term—“other disposal” of coal—encompassed a transac- tion lacking a transfer of title. See 314 U. S., at 416–417. The Court evidently perceived no basis for deference to the agency with respect to that pure legal question. And in Hearst, the Court proclaimed that “[u]ndoubtedly questions of statutory interpretation . . . are for the courts to resolve, giving appropriate weight to the judgment of those whose special duty is to administer the questioned statute.” 322 U. S., at 130–131. At least with respect to questions it re- garded as involving “statutory interpretation,” the Court thus did not disturb the traditional rule. It merely thought that a different approach should apply where application of a statutory term was suffciently intertwined with the agency's factfnding. In any event, the Court was far from consistent in review- ing deferentially even such factbound statutory determina- tions. Often the Court simply interpreted and applied the statute before it. See K. Davis, Administrative Law § 248, p. 893 (1951) (“The one statement that can be made with confdence about applicability of the doctrine of Gray v. Pow- ell is that sometimes the Supreme Court applies it and some- 390 LOPER BRIGHT ENTERPRISES v. RAIMONDO

times it does not.”); B. Schwartz, Gray vs. Powell and the Scope of Review, 54 Mich. L. Rev. 1, 68 (1955) (noting an “embarrassingly large number of Supreme Court decisions that do not adhere to the doctrine of Gray v. Powell”). In one illustrative example, the Court rejected the U. S. Price Administrator's determination that a particular warehouse was a “public utility” entitled to an exemption from the Ad- ministrator's General Maximum Price Regulation. Despite the striking resemblance of that administrative determina- tion to those that triggered deference in Gray and Hearst, the Court declined to “accept the Administrator's view in deference to administrative construction.” Davies Ware- house Co. v. Bowles, 321 U. S. 144, 156 (1944). The Adminis- trator's view, the Court explained, had “hardly seasoned or broadened into a settled administrative practice,” and thus did not “overweigh the considerations” the Court had “set forth as to the proper construction of the statute.” Ibid. Nothing in the New Deal era or before it thus resembled the deference rule the Court would begin applying decades later to all varieties of agency interpretations of statutes. Instead, just fve years after Gray and two after Hearst, Congress codifed the opposite rule: the traditional under- standing that courts must “decide all relevant questions of law.” 5 U. S. C. § 706.3

3 The dissent plucks out Gray, Hearst, and—to “gild the lily,” in its tell- ing—three more 1940s decisions, claiming they refect the relevant histori- cal tradition of judicial review. Post, at 468–469, and n. 6 (opinion of Kagan, J.). But it has no substantial response to the fact that Gray and Hearst themselves endorsed, implicitly in one case and explicitly in the next, the traditional rule that “questions of statutory interpretation . . . are for the courts to resolve, giving appropriate weight”—not outright defer- ence—“to the judgment of those whose special duty is to administer the questioned statute.” Hearst, 322 U. S., at 130–131. And it fails to recog- nize the deep roots that this rule has in our Nation's judicial tradition, to the limited extent it engages with that tradition at all. See post, at 467– 468, n. 5. Instead, like the Government, it strains to equate the “respect” or Cite as: 603 U. S. 369 (2024) 391

C Congress in 1946 enacted the APA “as a check upon admin- istrators whose zeal might otherwise have carried them to excesses not contemplated in legislation creating their of- fces.” Morton Salt, 338 U. S., at 644. It was the culmina- tion of a “comprehensive rethinking of the place of adminis- trative agencies in a regime of separate and divided powers.” Bowen v. Michigan Academy of Family Physicians, 476 U. S. 667, 670–671 (1986). In addition to prescribing procedures for agency action, the APA delineates the basic contours of judicial review of such action. As relevant here, Section 706 directs that “[t]o the extent necessary to decision and when presented, the reviewing court shall decide all relevant questions of law, interpret constitutional and statutory provisions, and deter- mine the meaning or applicability of the terms of an agency action.” 5 U. S. C. § 706. It further requires courts to “hold unlawful and set aside agency action, fndings, and conclusions found to be . . . not in accordance with law.” § 706(2)(A). The APA thus codifes for agency cases the unremarkable, yet elemental proposition refected by judicial practice dat-

“weight” traditionally afforded to Executive Branch interpretations with binding deference. See ibid.; Brief for Respondents in No. 22–1219, pp. 21–24. That supposed equivalence is a fction. The dissent's cases establish that a “contemporaneous construction” shared by “not only . . . the courts” but also “the departments” could be “controlling,” Schell's Executors v. Fauché, 138 U. S. 562, 572 (1891) (emphasis added), and that courts might “lean in favor” of a “contemporaneous” and “continued” con- struction of the Executive Branch as strong evidence of a statute's mean- ing, United States v. Alabama Great Southern R. Co., 142 U. S. 615, 621 (1892). They do not establish that Executive Branch interpretations of ambiguous statutes—no matter how inconsistent, late breaking, or fawed—always bound the courts. In reality, a judge was never “bound to adopt the construction given by the head of a department.” Decatur v. Paulding, 14 Pet. 497, 515 (1840). 392 LOPER BRIGHT ENTERPRISES v. RAIMONDO

ing back to Marbury: that courts decide legal questions by applying their own judgment. It specifes that courts, not agencies, will decide “all relevant questions of law” arising on review of agency action, § 706 (emphasis added)—even those involving ambiguous laws—and set aside any such ac- tion inconsistent with the law as they interpret it. And it prescribes no deferential standard for courts to employ in answering those legal questions. That omission is telling, because Section 706 does mandate that judicial review of agency policymaking and factfnding be deferential. See § 706(2)(A) (agency action to be set aside if “arbitrary, capri- cious, [or] an abuse of discretion”); § 706(2)(E) (agency fact- fnding in formal proceedings to be set aside if “unsupported by substantial evidence”). In a statute designed to “serve as the fundamental charter of the administrative state,” Kisor v. Wilkie, 588 U. S. 558, 580 (2019) (plurality opinion) (internal quotation marks omit- ted), Congress surely would have articulated a similarly def- erential standard applicable to questions of law had it in- tended to depart from the settled pre-APA understanding that deciding such questions was “exclusively a judicial func- tion,” American Trucking Assns., 310 U. S., at 544. But nothing in the APA hints at such a dramatic departure. On the contrary, by directing courts to “interpret constitutional and statutory provisions” without differentiating between the two, Section 706 makes clear that agency interpretations of statutes—like agency interpretations of the Constitu- tion—are not entitled to deference. Under the APA, it thus “remains the responsibility of the court to decide whether the law means what the agency says.” Perez v. Mortgage Bankers Assn., 575 U. S. 92, 109 (2015) (Scalia, J., concurring in judgment).4 4 The dissent observes that Section 706 does not say expressly that courts are to decide legal questions using “a de novo standard of review.” Post, at 463. That much is true. But statutes can be sensibly understood only “by reviewing text in context.” Pulsifer v. United States, 601 Cite as: 603 U. S. 369 (2024) 393

The text of the APA means what it says. And a look at its history if anything only underscores that plain meaning. According to both the House and Senate Reports on the leg- islation, Section 706 “provide[d] that questions of law are for courts rather than agencies to decide in the last analysis.” H. R. Rep. No. 1980, 79th Cong., 2d Sess., 44 (1946) (emphasis added); accord, S. Rep. No. 752, 79th Cong., 1st Sess., 28 (1945). Some of the legislation's most prominent supporters articulated the same view. See 92 Cong. Rec. 5654 (1946) (statement of Rep. Walter); P. McCarran, Improving “Admin- istrative Justice”: Hearings and Evidence; Scope of Judicial Review, 32 A. B. A. J. 827, 831 (1946). Even the Department of Justice—an agency with every incentive to endorse a view of the APA favorable to the Executive Branch—opined after its enactment that Section 706 merely “restate[d] the present law as to the scope of judicial review.” Dept. of Justice, At- torney General's Manual on the Administrative Procedure Act 108 (1947); see also Kisor, 588 U. S., at 582 (plurality opinion) (same). That “present law,” as we have described, adhered to the traditional conception of the judicial function. See supra, at 387–390. Various respected commentators contemporaneously maintained that the APA required reviewing courts to exer- cise independent judgment on questions of law. Professor John Dickinson, for example, read the APA to “impose a clear mandate that all [questions of law] shall be decided by the reviewing Court for itself, and in the exercise of its own

U. S. 124, 133 (2024). Since the start of our Republic, courts have “de- cide[d] . . . questions of law” and “interpret[ed] constitutional and statu- tory provisions” by applying their own legal judgment. § 706. Setting aside its misplaced reliance on Gray and Hearst, the dissent does not and could not deny that tradition. But it nonetheless insists that to codify that tradition, Congress needed to expressly reject a sort of deference the courts had never before applied—and would not apply for several decades to come. It did not. “The notion that some things `go without saying' applies to legislation just as it does to everyday life.” Bond v. United States, 572 U. S. 844, 857 (2014). 394 LOPER BRIGHT ENTERPRISES v. RAIMONDO

independent judgment.” Administrative Procedure Act: Scope and Grounds of Broadened Judicial Review, 33 A. B. A. J. 434, 516 (1947). Professor Bernard Schwartz noted that § 706 “would seem . . . to be merely a legislative restatement of the familiar review principle that questions of law are for the reviewing court, at the same time leaving to the courts the task of determining in each case what are questions of law.” Mixed Questions of Law and Fact and the Administrative Procedure Act, 19 Ford. L. Rev. 73, 84– 85 (1950). And Professor Louis Jaffe, who had served in several agencies at the advent of the New Deal, thought that § 706 leaves it up to the reviewing “court” to “decide as a `question of law' whether there is `discretion' in the prem- ises”—that is, whether the statute at issue delegates particu- lar discretionary authority to an agency. Judicial Control of Administrative Action 570 (1965). The APA, in short, incorporates the traditional under- standing of the judicial function, under which courts must exercise independent judgment in determining the mean- ing of statutory provisions. In exercising such judgment, though, courts may—as they have from the start—seek aid from the interpretations of those responsible for implement- ing particular statutes. Such interpretations “constitute a body of experience and informed judgment to which courts and litigants may properly resort for guidance” consistent with the APA. Skidmore, 323 U. S., at 140. And interpre- tations issued contemporaneously with the statute at issue, and which have remained consistent over time, may be espe- cially useful in determining the statute's meaning. See ibid.; American Trucking Assns., 310 U. S., at 549. In a case involving an agency, of course, the statute's meaning may well be that the agency is authorized to ex- ercise a degree of discretion. Congress has often enacted such statutes. For example, some statutes “expressly dele- gate[ ]” to an agency the authority to give meaning to a par- ticular statutory term. Batterton v. Francis, 432 U. S. 416, Cite as: 603 U. S. 369 (2024) 395

425 (1977) (emphasis deleted).5 Others empower an agency to prescribe rules to “fll up the details” of a statutory scheme, Wayman v. Southard, 10 Wheat. 1, 43 (1825), or to regulate subject to the limits imposed by a term or phrase that “leaves agencies with fexibility,” Michigan v. EPA, 576 U. S. 743, 752 (2015), such as “appropriate” or “reasonable.” 6 When the best reading of a statute is that it delegates discretionary authority to an agency, the role of the review- ing court under the APA is, as always, to independently in- terpret the statute and effectuate the will of Congress sub- ject to constitutional limits. The court fulflls that role by recognizing constitutional delegations, “fx[ing] the bound- aries of [the] delegated authority,” H. Monaghan, Marbury and the Administrative State, 83 Colum. L. Rev. 1, 27 (1983), and ensuring the agency has engaged in “ `reasoned decision- making' ” within those boundaries, Michigan, 576 U. S., at 750 (quoting Allentown Mack Sales & Service, Inc. v. NLRB, 522 U. S. 359, 374 (1998)); see also Motor Vehicle Mfrs. Assn. of United States, Inc. v. State Farm Mut. Automobile Ins. Co., 463 U. S. 29 (1983). By doing so, a court upholds the

5 See, e. g., 29 U. S. C. § 213(a)(15) (exempting from provisions of the Fair Labor Standards Act “any employee employed on a casual basis in domes- tic service employment to provide companionship services for individuals who (because of age or infrmity) are unable to care for themselves (as such terms are defned and delimited by regulations of the Secretary)” (emphasis added)); 42 U. S. C. § 5846(a)(2) (requiring notifcation to Nuclear Regulatory Commission when a facility or activity licensed or regulated pursuant to the Atomic Energy Act “contains a defect which could create a substantial safety hazard, as defned by regulations which the Commis- sion shall promulgate” (emphasis added)). 6 See, e. g., 33 U. S. C. § 1312(a) (requiring establishment of effuent limi- tations “[w]henever, in the judgment of the [Environmental Protection Agency (EPA)] Administrator . . . , discharges of pollutants from a point source or group of point sources . . . would interfere with the attainment or maintenance of that water quality . . . which shall assure” various out- comes, such as the “protection of public health” and “public water sup- plies”); 42 U. S. C. § 7412(n)(1)(A) (directing EPA to regulate power plants “if the Administrator fnds such regulation is appropriate and necessary”). 396 LOPER BRIGHT ENTERPRISES v. RAIMONDO

traditional conception of the judicial function that the APA adopts. III The deference that Chevron requires of courts reviewing agency action cannot be squared with the APA.

A In the decades between the enactment of the APA and this Court's decision in Chevron, courts generally continued to review agency interpretations of the statutes they adminis- ter by independently examining each statute to determine its meaning. Cf. T. Merrill, Judicial Deference to Executive Precedent, 101 Yale L. J. 969, 972–975 (1992). As an early proponent (and later critic) of Chevron recounted, courts during this period thus identifed delegations of discretion- ary authority to agencies on a “statute-by-statute basis.” A. Scalia, Judicial Deference to Administrative Interpreta- tions of Law, 1989 Duke L. J. 511, 516. Chevron, decided in 1984 by a bare quorum of six Justices, triggered a marked departure from the traditional approach. The question in the case was whether an EPA regulation “allow[ing] States to treat all of the pollution-emitting de- vices within the same industrial grouping as though they were encased within a single `bubble' ” was consistent with the term “stationary source” as used in the Clean Air Act. 467 U. S., at 840. To answer that question of statutory in- terpretation, the Court articulated and employed a now fa- miliar two-step approach broadly applicable to review of agency action. The frst step was to discern “whether Congress ha[d] di- rectly spoken to the precise question at issue.” Id., at 842. The Court explained that “[i]f the intent of Congress is clear, that is the end of the matter,” ibid., and courts were there- fore to “reject administrative constructions which are con- trary to clear congressional intent,” id., at 843, n. 9. To dis- Cite as: 603 U. S. 369 (2024) 397

cern such intent, the Court noted, a reviewing court was to “employ[ ] traditional tools of statutory construction.” Ibid. Without mentioning the APA, or acknowledging any doc- trinal shift, the Court articulated a second step applicable when “Congress ha[d] not directly addressed the precise question at issue.” Id., at 843. In such a case—that is, a case in which “the statute [was] silent or ambiguous with respect to the specifc issue” at hand—a reviewing court could not “simply impose its own construction on the statute, as would be necessary in the absence of an administrative interpretation.” Ibid. (footnote omitted). A court instead had to set aside the traditional interpretive tools and defer to the agency if it had offered “a permissible construction of the statute,” ibid., even if not “the reading the court would have reached if the question initially had arisen in a judicial proceeding,” ibid., n. 11. That directive was justifed, ac- cording to the Court, by the understanding that administer- ing statutes “requires the formulation of policy” to fll statu- tory “gap[s]”; by the long judicial tradition of according “considerable weight” to Executive Branch interpretations; and by a host of other considerations, including the complex- ity of the regulatory scheme, EPA's “detailed and reasoned” consideration, the policy-laden nature of the judgment sup- posedly required, and the agency's indirect accountability to the people through the President. Id., at 843, 844, and n. 14, 865. Employing this new test, the Court concluded that Con- gress had not addressed the question at issue with the neces- sary “level of specifcity” and that EPA's interpretation was “entitled to deference.” Id., at 865. It did not matter why Congress, as the Court saw it, had not squarely addressed the question, see ibid., or that “the agency ha[d] from time to time changed its interpretation,” id., at 863. The latest EPA interpretation was a permissible reading of the Clean Air Act, so under the Court's new rule, that reading controlled. 398 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Initially, Chevron “seemed destined to obscurity.” T. Merrill, The Story of Chevron: The Making of an Accidental Landmark, 66 Admin. L. Rev. 253, 276 (2014). The Court did not at frst treat it as the watershed decision it was fated to become; it was hardly cited in cases involving statutory questions of agency authority. See ibid. But within a few years, both this Court and the courts of appeals were rou- tinely invoking its two-step framework as the governing standard in such cases. See id., at 276–277. As the Court did so, it revisited the doctrine's justifcations. Eventually, the Court decided that Chevron rested on “a presumption that Congress, when it left ambiguity in a statute meant for implementation by an agency, understood that the ambiguity would be resolved, frst and foremost, by the agency, and desired the agency (rather than the courts) to possess what- ever degree of discretion the ambiguity allows.” Smiley v. Citibank (South Dakota), N. A., 517 U. S. 735, 740–741 (1996); see also, e. g., Cuozzo Speed Technologies, LLC v. Lee, 579 U. S. 261, 276–277 (2016); Utility Air Regulatory Group v. EPA, 573 U. S. 302, 315 (2014); National Cable & Telecom- munications Assn. v. Brand X Internet Services, 545 U. S. 967, 982 (2005). B Neither Chevron nor any subsequent decision of this Court attempted to reconcile its framework with the APA. The “law of deference” that this Court has built on the foundation laid in Chevron has instead been “[h]eedless of the original design” of the APA. Perez, 575 U. S., at 109 (Scalia, J., con- curring in judgment). 1 Chevron defes the command of the APA that “the review- ing court”—not the agency whose action it reviews—is to “decide all relevant questions of law” and “interpret . . . stat- utory provisions.” § 706 (emphasis added). It requires a court to ignore, not follow, “the reading the court would have Cite as: 603 U. S. 369 (2024) 399

reached” had it exercised its independent judgment as re- quired by the APA. Chevron, 467 U. S., at 843, n. 11. And although exercising independent judgment is consistent with the “respect” historically given to Executive Branch inter- pretations, see, e. g., Edwards' Lessee, 12 Wheat., at 210; Skidmore, 323 U. S., at 140, Chevron insists on much more. It demands that courts mechanically afford binding defer- ence to agency interpretations, including those that have been inconsistent over time. See 467 U. S., at 863. Still worse, it forces courts to do so even when a pre-existing judicial precedent holds that the statute means something else—unless the prior court happened to also say that the statute is “unambiguous. ” Brand X, 545 U. S., at 982. That regime is the antithesis of the time honored approach the APA prescribes. In fretting over the prospect of “allow[ing]” a judicial interpretation of a statute “to override an agency's” in a dispute before a court, ibid., Chevron turns the statutory scheme for judicial review of agency action up- side down. Chevron cannot be reconciled with the APA, as the Gov- ernment and the dissent contend, by presuming that statu- tory ambiguities are implicit delegations to agencies. See Brief for Respondents in No. 22–1219, pp. 13, 37–38; post, at 451–462 (opinion of Kagan, J.). Presumptions have their place in statutory interpretation, but only to the extent that they approximate reality. Chevron's presumption does not, because “[a]n ambiguity is simply not a delegation of law- interpreting power. Chevron confuses the two.” C. Sun- stein, Interpreting Statutes in the Regulatory State, 103 Harv. L. Rev. 405, 445 (1989). As Chevron itself noted, am- biguities may result from an inability on the part of Congress to squarely answer the question at hand, or from a failure to even “consider the question” with the requisite precision. 467 U. S., at 865. In neither case does an ambiguity neces- sarily refect a congressional intent that an agency, as op- posed to a court, resolve the resulting interpretive question. 400 LOPER BRIGHT ENTERPRISES v. RAIMONDO

And many or perhaps most statutory ambiguities may be unintentional. As the Framers recognized, ambiguities will inevitably follow from “the complexity of objects, . . . the imperfection of the human faculties,” and the simple fact that “no language is so copious as to supply words and phrases for every complex idea.” The Federalist No. 37, at 236. Courts, after all, routinely confront statutory ambiguities in cases having nothing to do with Chevron—cases that do not involve agency interpretations or delegations of author- ity. Of course, when faced with a statutory ambiguity in such a case, the ambiguity is not a delegation to anybody, and a court is not somehow relieved of its obligation to in- dependently interpret the statute. Courts in that situation do not throw up their hands because “Congress's instruc- tions have” supposedly “run out,” leaving a statutory “gap.” Post, at 449 (opinion of Kagan, J.). Courts instead under- stand that such statutes, no matter how impenetrable, do— in fact, must—have a single, best meaning. That is the whole point of having written statutes; “every statute's meaning is fxed at the time of enactment.” Wisconsin Cen- tral Ltd. v. United States, 585 U. S. 274, 284 (2018) (emphasis deleted). So instead of declaring a particular party's read- ing “permissible” in such a case, courts use every tool at their disposal to determine the best reading of the statute and resolve the ambiguity. In an agency case as in any other, though, even if some judges might (or might not) consider the statute ambiguous, there is a best reading all the same—“the reading the court would have reached” if no agency were involved. Chevron, 467 U. S., at 843, n. 11. It therefore makes no sense to speak of a “permissible” interpretation that is not the one the court, after applying all relevant interpretive tools, con- cludes is best. In the business of statutory interpretation, if it is not the best, it is not permissible. Perhaps most fundamentally, Chevron's presumption is misguided because agencies have no special competence in Cite as: 603 U. S. 369 (2024) 401

resolving statutory ambiguities. Courts do. The Framers, as noted, anticipated that courts would often confront statu- tory ambiguities and expected that courts would resolve them by exercising independent legal judgment. And even Chevron itself reaffrmed that “[t]he judiciary is the fnal au- thority on issues of statutory construction” and recognized that “in the absence of an administrative interpretation,” it is “necessary” for a court to “impose its own construction on the statute.” Id., at 843, and n. 9. Chevron gravely erred, though, in concluding that the inquiry is fundamentally dif- ferent just because an administrative interpretation is in play. The very point of the traditional tools of statutory construction—the tools courts use every day—is to resolve statutory ambiguities. That is no less true when the ambi- guity is about the scope of an agency's own power—perhaps the occasion on which abdication in favor of the agency is least appropriate. 2 The Government responds that Congress must generally intend for agencies to resolve statutory ambiguities because agencies have subject matter expertise regarding the stat- utes they administer; because deferring to agencies purport- edly promotes the uniform construction of federal law; and because resolving statutory ambiguities can involve policy- making best left to political actors, rather than courts. See Brief for Respondents in No. 22–1219, pp. 16–19. The dis- sent offers more of the same. See post, at 456–461. But none of these considerations justifes Chevron's sweeping presumption of congressional intent. Beginning with expertise, we recently noted that interpre- tive issues arising in connection with a regulatory scheme often “may fall more naturally into a judge's bailiwick” than an agency's. Kisor, 588 U. S., at 578 (opinion of the Court). We thus observed that “[w]hen the agency has no compar- ative expertise in resolving a regulatory ambiguity, Con- gress presumably would not grant it that authority.” Ibid. 402 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Chevron's broad rule of deference, though, demands that courts presume just the opposite. Under that rule, ambigu- ities of all stripes trigger deference. Indeed, the Govern- ment and, seemingly, the dissent continue to defend the prop- osition that Chevron applies even in cases having little to do with an agency's technical subject matter expertise. See Brief for Respondents in No. 22–1219, p. 17; post, at 457. But even when an ambiguity happens to implicate a techni- cal matter, it does not follow that Congress has taken the power to authoritatively interpret the statute from the courts and given it to the agency. Congress expects courts to handle technical statutory questions. “[M]any statutory cases” call upon “courts [to] interpret the mass of technical detail that is the ordinary diet of the law,” Egelhoff v. Egel- hoff, 532 U. S. 141, 161 (2001) (Breyer, J., dissenting), and courts did so without issue in agency cases before Chevron, see post, at 444–445 (Gorsuch, J., concurring). Courts, after all, do not decide such questions blindly. The parties and amici in such cases are steeped in the subject matter, and re- viewing courts have the beneft of their perspectives. In an agency case in particular, the court will go about its task with the agency's “body of experience and informed judg- ment,” among other information, at its disposal. Skidmore, 323 U. S., at 140. And although an agency's interpretation of a statute “cannot bind a court,” it may be especially infor- mative “to the extent it rests on factual premises within [the agency's] expertise.” Bureau of Alcohol, Tobacco and Fire- arms v. FLRA, 464 U. S. 89, 98, n. 8 (1983). Such expertise has always been one of the factors which may give an Execu- tive Branch interpretation particular “power to persuade, if lacking power to control.” Skidmore, 323 U. S., at 140; see, e. g., County of Maui v. Hawaii Wildlife Fund, 590 U. S. 165, 180 (2020); Moore, 95 U. S., at 763. For those reasons, delegating ultimate interpretive au- thority to agencies is simply not necessary to ensure that the Cite as: 603 U. S. 369 (2024) 403

resolution of statutory ambiguities is well informed by sub- ject matter expertise. The better presumption is therefore that Congress expects courts to do their ordinary job of in- terpreting statutes, with due respect for the views of the Executive Branch. And to the extent that Congress and the Executive Branch may disagree with how the courts have performed that job in a particular case, they are of course always free to act by revising the statute. Nor does a desire for the uniform construction of federal law justify Chevron. Given inconsistencies in how judges apply Chevron, see infra, at 407–410, it is unclear how much the doctrine as a whole (as opposed to its highly deferential second step) actually promotes such uniformity. In any event, there is little value in imposing a uniform interpreta- tion of a statute if that interpretation is wrong. We see no reason to presume that Congress prefers uniformity for uni- formity's sake over the correct interpretation of the laws it enacts. The view that interpretation of ambiguous statutory pro- visions amounts to policymaking suited for political actors rather than courts is especially mistaken, for it rests on a profound misconception of the judicial role. It is reasonable to assume that Congress intends to leave policymaking to political actors. But resolution of statutory ambiguities in- volves legal interpretation. That task does not suddenly be- come policymaking just because a court has an “agency to fall back on.” Kisor, 588 U. S., at 575 (opinion of the Court). Courts interpret statutes, no matter the context, based on the traditional tools of statutory construction, not individual policy preferences. Indeed, the Framers crafted the Consti- tution to ensure that federal judges could exercise judg- ment free from the infuence of the political branches. See The Federalist No. 78, at 522–525. They were to construe the law with “[c]lear heads . . . and honest hearts,” not with an eye to policy preferences that had not made it into 404 LOPER BRIGHT ENTERPRISES v. RAIMONDO

the statute. 1 Works of James Wilson 363 (J. Andrews ed. 1896). That is not to say that Congress cannot or does not confer discretionary authority on agencies. Congress may do so, subject to constitutional limits, and it often has. But to stay out of discretionary policymaking left to the political branches, judges need only fulfll their obligations under the APA to independently identify and respect such delegations of authority, police the outer statutory boundaries of those delegations, and ensure that agencies exercise their discre- tion consistent with the APA. By forcing courts to instead pretend that ambiguities are necessarily delegations, Chev- ron does not prevent judges from making policy. It pre- vents them from judging. 3 In truth, Chevron's justifying presumption is, as Members of this Court have often recognized, a fction. See Buffng- ton v. McDonough, 598 U. S. 1021, 1029–1030 (2022) (Gor- such, J., dissenting from denial of certiorari); Cuozzo, 579 U. S., at 286 (Thomas, J., concurring); Scalia, 1989 Duke L. J., at 517; see also post, at 462 (opinion of Kagan, J.). So we have spent the better part of four decades imposing one limi- tation on Chevron after another, pruning its presumption on the understanding that “where it is in doubt that Congress actually intended to delegate particular interpretive author- ity to an agency, Chevron is `inapplicable.' ” United States v. Mead Corp., 533 U. S. 218, 230 (2001) (quoting Christensen v. Harris County, 529 U. S. 576, 597 (2000) (Breyer, J., dis- senting)); see also Adams Fruit Co. v. Barrett, 494 U. S. 638, 649 (1990). Consider the many refnements we have made in an effort to match Chevron's presumption to reality. We have said that Chevron applies only “when it appears that Congress delegated authority to the agency generally to make rules carrying the force of law, and that the agency interpretation claiming deference was promulgated in the exercise of that Cite as: 603 U. S. 369 (2024) 405

authority.” Mead, 533 U. S., at 226–227. In practice, that threshold requirement—sometimes called Chevron “step zero”—largely limits Chevron to “the fruits of notice-and- comment rulemaking or formal adjudication.” 533 U. S., at 230. But even when those processes are used, deference is still not warranted “where the regulation is `procedurally de- fective'—that is, where the agency errs by failing to follow the correct procedures in issuing the regulation.” Encino Motorcars, LLC v. Navarro, 579 U. S. 211, 220 (2016) (quot- ing Mead, 533 U. S., at 227). Even where those procedural hurdles are cleared, substan- tive ones remain. Most notably, Chevron does not apply if the question at issue is one of “deep `economic and political signifcance.' ” King v. Burwell, 576 U. S. 473, 486 (2015). We have instead expected Congress to delegate such author- ity “expressly” if at all, ibid., for “[e]xtraordinary grants of regulatory authority are rarely accomplished through `mod- est words,' `vague terms,' or `subtle device[s],' ” West Vir- ginia v. EPA, 597 U. S. 697, 723 (2022) (quoting Whitman v. American Trucking Assns., Inc., 531 U. S. 457, 468 (2001); alteration in original). Nor have we applied Chevron to agency interpretations of judicial review provisions, see Adams Fruit Co., 494 U. S., at 649–650, or to statutory schemes not administered by the agency seeking deference, see Epic Systems Corp. v. Lewis, 584 U. S. 497, 519–520 (2018). And we have sent mixed signals on whether Chev- ron applies when a statute has criminal applications. Com- pare Abramski v. United States, 573 U. S. 169, 191 (2014), with Babbitt v. Sweet Home Chapter, Communities for Great Ore., 515 U. S. 687, 704, n. 18 (1995). Confronted with this byzantine set of preconditions and exceptions, some courts have simply bypassed Chevron, say- ing it makes no difference for one reason or another.7 And 7 See, e.g., Guedes v. Bureau of Alcohol, Tobacco, Firearms and Explo- sives, 45 F. 4th 306, 313–314 (CADC 2022), abrogated by Garland v. Car- gill, 602 U. S. 406 (2024); County of Amador v. United States Dept. of 406 LOPER BRIGHT ENTERPRISES v. RAIMONDO

even when they do invoke Chevron, courts do not always heed the various steps and nuances of that evolving doctrine. In one of the cases before us today, for example, the First Circuit both skipped “step zero,” see 62 F. 4th, at 628, and refused to “classify [its] conclusion as a product of Chevron step one or step two”—though it ultimately appears to have deferred under step two, id., at 634. This Court, for its part, has not deferred to an agency in- terpretation under Chevron since 2016. See Cuozzo, 579 U. S., at 280 (most recent occasion). But Chevron remains on the books. So litigants must continue to wrestle with it, and lower courts—bound by even our crumbling precedents, see Agostini v. Felton, 521 U. S. 203, 238 (1997)—understand- ably continue to apply it. The experience of the last 40 years has thus done little to rehabilitate Chevron. It has only made clear that Chevron's fctional presumption of congressional intent was always un- moored from the APA's demand that courts exercise inde- pendent judgment in construing statutes administered by agencies. At best, our intricate Chevron doctrine has been nothing more than a distraction from the question that mat- ters: Does the statute authorize the challenged agency ac- tion? And at worst, it has required courts to violate the APA by yielding to an agency the express responsibility, vested in “the reviewing court,” to “decide all relevant ques-

Interior, 872 F. 3d 1012, 1021–1022 (CA9 2017); Estrada-Rodriguez v. Lynch, 825 F. 3d 397, 403–404 (CA8 2016); Nielsen v. AECOM Tech. Corp., 762 F. 3d 214, 220 (CA2 2014); Alaska Stock, LLC v. Houghton Miffin Harcourt Publishing Co., 747 F. 3d 673, 685, n. 52 (CA9 2014); Jurado- Delgado v. Attorney Gen. of U. S., 498 Fed. Appx. 107, 117 (CA3 2009); see also D. Brookins, Confusion in the Circuit Courts: How the Circuit Courts Are Solving the Mead-Puzzle by Avoiding It Altogether, 85 Geo. Wash. L. Rev. 1484, 1496–1499 (2017) (documenting Chevron avoidance by the lower courts); A. Vermeule, Our Schmittian Administrative Law, 122 Harv. L. Rev. 1095, 1127–1129 (2009) (same); L. Bressman, How Mead Has Mud- dled Judicial Review of Agency Action, 58 Vand. L. Rev. 1443, 1464–1466 (2005) (same). Cite as: 603 U. S. 369 (2024) 407

tions of law” and “interpret . . . statutory provisions.” § 706 (emphasis added). IV The only question left is whether stare decisis, the doc- trine governing judicial adherence to precedent, requires us to persist in the Chevron project. It does not. Stare deci- sis is not an “inexorable command,” Payne v. Tennessee, 501 U. S. 808, 828 (1991), and the stare decisis considerations most relevant here—“the quality of [the precedent's] reason- ing, the workability of the rule it established, . . . and reliance on the decision,” Knick v. Township of Scott, 588 U. S. 180, 203 (2019) (quoting Janus v. State, County, and Municipal Employees, 585 U. S. 878, 917 (2018))—all weigh in favor of letting Chevron go. Chevron has proved to be fundamentally misguided. De- spite reshaping judicial review of agency action, neither it nor any case of ours applying it grappled with the APA—the statute that lays out how such review works. Its faws were nonetheless apparent from the start, prompting this Court to revise its foundations and continually limit its application. It has launched and sustained a cottage industry of scholars attempting to decipher its basis and meaning. And Mem- bers of this Court have long questioned its premises. See, e. g., Pereira v. Sessions, 585 U. S. 198, 219–221 (2018) (Kennedy, J., concurring); Michigan, 576 U. S., at 760–764 (Thomas, J., concurring); Buffngton, 598 U. S. 1021 (opinion of Gorsuch, J.); B. Kavanaugh, Fixing Statutory Interpreta- tion, 129 Harv. L. Rev. 2118, 2150–2154 (2016). Even Justice Scalia, an early champion of Chevron, came to seriously doubt whether it could be reconciled with the APA. See Perez, 575 U. S., at 109–110 (opinion concurring in judgment). For its entire existence, Chevron has been a “rule in search of a justifcation,” Knick, 588 U. S., at 204, if it was ever coherent enough to be called a rule at all. Experience has also shown that Chevron is unworkable. The defning feature of its framework is the identifcation of 408 LOPER BRIGHT ENTERPRISES v. RAIMONDO

statutory ambiguity, which requires deference at the doc- trine's second step. But the concept of ambiguity has al- ways evaded meaningful defnition. As Justice Scalia put the dilemma just fve years after Chevron was decided: “How clear is clear?” 1989 Duke L. J., at 521. We are no closer to an answer to that question than we were four decades ago. “ `[A]mbiguity' is a term that may have different meanings for different judges.” Exxon Mobil Corp. v. Allapattah Services, Inc., 545 U. S. 546, 572 (2005) (Stevens, J., dissenting). One judge might see ambiguity ev- erywhere; another might never encounter it. Compare L. Silberman, Chevron—The Intersection of Law & Policy, 58 Geo. Wash. L. Rev. 821, 822 (1990), with R. Kethledge, Ambi- guities and Agency Cases: Refections After (Almost) Ten Years on the Bench, 70 Vand. L. Rev. En Banc 315, 323 (2017). A rule of law that is so wholly “in the eye of the beholder,” Exxon Mobil Corp., 545 U. S., at 572 (Stevens, J., dissenting), invites different results in like cases and is therefore “arbitrary in practice,” Gulfstream Aerospace Corp. v. Mayacamas Corp., 485 U. S. 271, 283 (1988). Such an impressionistic and malleable concept “cannot stand as an every-day test for allocating” interpretive authority be- tween courts and agencies. Swift & Co. v. Wickham, 382 U. S. 111, 125 (1965). The dissent proves the point. It tells us that a court should reach Chevron's second step when it fnds, “at the end of its interpretive work,” that “Congress has left an ambigu- ity or gap.” Post, at 449. (The Government offers a similar test. See Brief for Respondents in No. 22–1219, pp. 7, 10, 14; Tr. of Oral Arg. 113–114, 116.) That is no guide at all. Once more, the basic nature and meaning of a statute does not change when an agency happens to be involved. Nor does it change just because the agency has happened to offer its interpretation through the sort of procedures necessary to obtain deference, or because the other preconditions for Chevron happen to be satisfed. The statute still has a best Cite as: 603 U. S. 369 (2024) 409

meaning, necessarily discernible by a court deploying its full interpretive toolkit. So for the dissent's test to have any meaning, it must think that in an agency case (unlike in any other), a court should give up on its “interpretive work” be- fore it has identifed that best meaning. But how does a court know when to do so? On that point, the dissent leaves a gap of its own. It protests only that some other interpre- tive tools—all with pedigrees more robust than Chevron's, and all designed to help courts identify the meaning of a text rather than allow the Executive Branch to displace it—also apply to ambiguous texts. See post, at 474. That this is all the dissent can come up with, after four decades of judicial experience attempting to identify ambiguity under Chevron, reveals the futility of the exercise.8 Because Chevron in its original, two-step form was so in- determinate and sweeping, we have instead been forced to clarify the doctrine again and again. Our attempts to do so have only added to Chevron's unworkability, transform- ing the original two-step into a dizzying breakdance. See Adams Fruit Co., 494 U. S., at 649–650; Mead, 533 U. S., at 226–227; King, 576 U. S., at 486; Encino Motorcars, 579 U. S., at 220; Epic Systems, 584 U. S., at 519–520; on and on. And the doctrine continues to spawn diffcult threshold questions that promise to further complicate the inquiry should Chev- ron be retained. See, e. g., Cargill v. Garland, 57 F. 4th 447, 465–468 (CA5 2023) (plurality opinion) (May the Govern- ment waive reliance on Chevron? Does Chevron apply to agency interpretations of statutes imposing criminal penal- ties? Does Chevron displace the rule of lenity?), aff'd, 602 U. S. 406 (2024).

8 Citing an empirical study, the dissent adds that Chevron “fosters agree- ment among judges.” Post, at 474. It is hardly surprising that a study might fnd as much; Chevron's second step is supposed to be hospitable to agency interpretations. So when judges get there, they tend to agree that the agency wins. That proves nothing about the supposed ease or predictability of identifying ambiguity in the frst place. 410 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Four decades after its inception, Chevron has thus become an impediment, rather than an aid, to accomplishing the basic judicial task of “say[ing] what the law is.” Marbury, 1 Cranch, at 177. And its continuing import is far from clear. Courts have often declined to engage with the doctrine, say- ing it makes no difference. See n. 7, supra. And as noted, we have avoided deferring under Chevron since 2016. That trend is nothing new; for decades, we have often declined to invoke Chevron even in those cases where it might appear to be applicable. See W. Eskridge & L. Baer, The Contin- uum of Deference: Supreme Court Treatment of Agency Statutory Interpretations From Chevron to Hamdan, 96 Geo. L. J. 1083, 1125 (2008). At this point, all that remains of Chevron is a decaying husk with bold pretensions. Nor has Chevron been the sort of “ `stable background' rule” that fosters meaningful reliance. Post, at 455, n. 1 (opinion of Kagan, J.) (quoting Morrison v. National Aus- tralia Bank Ltd., 561 U. S. 247, 261 (2010)). Given our con- stant tinkering with and eventual turn away from Chevron, and its inconsistent application by the lower courts, it instead is hard to see how anyone—Congress included—could rea- sonably expect a court to rely on Chevron in any particular case. And even if it were possible to predict accurately when courts will apply Chevron, the doctrine “does not pro- vide `a clear or easily applicable standard, so arguments for reliance based on its clarity are misplaced.' ” Janus, 585 U. S., at 927 (quoting South Dakota v. Wayfair, Inc., 585 U. S. 162, 186 (2018)). To plan on Chevron yielding a particular result is to gamble not only that the doctrine will be invoked, but also that it will produce readily foreseeable outcomes and the stability that comes with them. History has proved neither bet to be a winning proposition. Rather than safeguarding reliance interests, Chevron af- frmatively destroys them. Under Chevron, a statutory am- biguity, no matter why it is there, becomes a license authoriz- Cite as: 603 U. S. 369 (2024) 411

ing an agency to change positions as much as it likes, with “[u]nexplained inconsistency” being “at most . . . a reason for holding an interpretation to be . . . arbitrary and capricious.” Brand X, 545 U. S., at 981. But statutory ambiguity, as we have explained, is not a reliable indicator of actual delegation of discretionary authority to agencies. Chevron thus allows agencies to change course even when Congress has given them no power to do so. By its sheer breadth, Chevron fos- ters unwarranted instability in the law, leaving those at- tempting to plan around agency action in an eternal fog of uncertainty. Chevron accordingly has undermined the very “rule of law” values that stare decisis exists to secure. Michigan v. Bay Mills Indian Community, 572 U. S. 782, 798 (2014). And it cannot be constrained by admonishing courts to be extra careful, or by tacking on a new batch of conditions. We would need to once again “revis[e] its theoretical basis . . . in order to cure its practical defciencies.” Montejo v. Louisiana, 556 U. S. 778, 792 (2009). Stare decisis does not require us to do so, especially because any refnements we might make would only point courts back to their duties under the APA to “decide all relevant questions of law” and “interpret . . . statutory provisions.” § 706. Nor is there any reason to wait helplessly for Congress to correct our mistake. The Court has jettisoned many precedents that Congress likewise could have legislatively overruled. See, e. g., Patterson v. McLean Credit Union, 485 U. S. 617, 618 (1988) (per curiam) (collecting cases). And part of “judicial humility,” post, at 450, 471 (opinion of Kagan, J.), is admit- ting and in certain cases correcting our own mistakes, espe- cially when those mistakes are serious, see post, at 423–424 (opinion of Gorsuch, J.). This is one of those cases. Chevron was a judicial inven- tion that required judges to disregard their statutory duties. And the only way to “ensure that the law will not merely 412 LOPER BRIGHT ENTERPRISES v. RAIMONDO

change erratically, but will develop in a principled and intelli- gible fashion,” Vasquez v. Hillery, 474 U. S. 254, 265 (1986), is for us to leave Chevron behind. By doing so, however, we do not call into question prior cases that relied on the Chevron framework. The holdings of those cases that specifc agency actions are lawful—includ- ing the Clean Air Act holding of Chevron itself—are still subject to statutory stare decisis despite our change in inter- pretive methodology. See CBOCS West, Inc. v. Humphries, 553 U. S. 442, 457 (2008). Mere reliance on Chevron cannot constitute a “ `special justifcation' ” for overruling such a holding, because to say a precedent relied on Chevron is, at best, “just an argument that the precedent was wrongly de- cided.” Halliburton Co. v. Erica P. John Fund, Inc., 573 U. S. 258, 266 (2014) (quoting Dickerson v. United States, 530 U. S. 428, 443 (2000)). That is not enough to justify overrul- ing a statutory precedent.

Page Proof Pending * * * Publication The dissent ends by quoting Chevron: “ `Judges are not experts in the feld.' ” Post, at 478 (quoting 467 U. S., at 865). That depends, of course, on what the “feld” is. If it is legal interpretation, that has been, “emphatically,” “the province and duty of the judicial department” for at least 221 years. Marbury, 1 Cranch, at 177. The rest of the dissent's selected epigraph is that judges “ `are not part of either polit- ical branch.' ” Post, at 478 (quoting Chevron, 467 U. S., at 865). Indeed. Judges have always been expected to apply their “judgment” independent of the political branches when interpreting the laws those branches enact. The Federalist No. 78, at 523. And one of those laws, the APA, bars judges from disregarding that responsibility just because an Execu- tive Branch agency views a statute differently. Chevron is overruled. Courts must exercise their inde- pendent judgment in deciding whether an agency has acted within its statutory authority, as the APA requires. Careful Cite as: 603 U. S. 369 (2024) 413

Thomas, J., concurring

attention to the judgment of the Executive Branch may help inform that inquiry. And when a particular statute dele- gates authority to an agency consistent with constitutional limits, courts must respect the delegation, while ensuring that the agency acts within it. But courts need not and under the APA may not defer to an agency interpretation of the law simply because a statute is ambiguous. Because the D. C. and First Circuits relied on Chevron in deciding whether to uphold the Rule, their judgments are vacated, and the cases are remanded for further proceedings consistent with this opinion. It is so ordered.

Justice Thomas, concurring. I join the Court's opinion in full because it correctly con- cludes that Chevron U. S. A. Inc. v. Natural Resources De- fense Council, Inc., 467 U. S. 837 (1984), must fnally be over- ruled. Under Chevron, a judge was required to adopt an agency's interpretation of an ambiguous statute, so long as the agency had a “permissible construction of the statute.” See id., at 843. As the Court explains, that deference does not comport with the Administrative Procedure Act, which requires judges to decide “all relevant questions of law” and “interpret constitutional and statutory provisions” when reviewing an agency action. 5 U. S. C. § 706; see also ante, at 396–401; Baldwin v. United States, 589 U. S. 1237, 1240–1241 (2020) (Thomas, J., dissenting from denial of certiorari). I write separately to underscore a more fundamental prob- lem: Chevron deference also violates our Constitution's sepa- ration of powers, as I have previously explained at length. See Baldwin, 589 U. S., at 1239–1240 (dissenting opinion); Michigan v. EPA, 576 U. S. 743, 761–763 (2015) (concurring opinion); see also Perez v. Mortgage Bankers Assn., 575 U. S. 92, 115–118 (2015) (opinion concurring in judgment). And, I agree with Justice Gorsuch that we should not overlook 414 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Chevron's constitutional defects in overruling it.* Post, at 429–435 (concurring opinion). To provide “practical and real protections for individual liberty,” the Framers drafted a Constitution that divides the legislative, executive, and judi- cial powers between three branches of Government. Perez, 575 U. S., at 118 (opinion of Thomas, J.). Chevron deference compromises this separation of powers in two ways. It curbs the judicial power afforded to courts, and simultane- ously expands agencies' executive power beyond constitu- tional limits. Chevron compels judges to abdicate their Article III “ju- dicial Power.” § 1. “[T]he judicial power, as originally understood, requires a court to exercise its independent judg- ment in interpreting and expounding upon the laws.” Perez, 575 U. S., at 119 (opinion of Thomas, J.); accord, post, at 432– 433 (opinion of Gorsuch, J.). The Framers understood that “legal texts . . . often contain ambiguities,” and that the judicial power included “the power to resolve these ambiguities over time.” Perez, 575 U. S., at 119 (opinion of Thomas, J.); accord, ante, at 384–387. But, under Chevron, a judge must accept an agency's interpretation of an ambiguous law, even if he thinks another interpretation is correct. Ante, at 397. Chevron deference thus prevents judges from exercising their inde- pendent judgment to resolve ambiguities. Baldwin, 589 U. S., at 1239 (opinion of Thomas, J.); see also Michigan, 576 U. S., at 761 (opinion of Thomas, J.); see also Perez, 575 U. S., at 123 (opinion of Thomas, J.). By tying a judge's hands, Chevron prevents the Judiciary from serving as a constitu- tional check on the Executive. It allows “the Executive . . . to dictate the outcome of cases through erroneous interpre- tations.” Baldwin, 589 U. S., at 1240 (opinion of Thomas, J.); Michigan, 576 U. S., at 763, n. 1 (opinion of Thomas, J.);

*There is much to be commended in Justice Gorsuch's careful consid- eration from frst principles of the weight we should afford to our prece- dent. I agree with the lion's share of his concurrence. See generally Gamble v. United States, 587 U. S. 678, 710 (2019) (Thomas, J., concurring). Cite as: 603 U. S. 369 (2024) 415

see also Perez, 575 U. S., at 124 (opinion of Thomas, J.). Be- cause the judicial power requires judges to exercise their independent judgment, the deference that Chevron requires contravenes Article III's mandate. Chevron deference also permits the Executive Branch to exercise powers not given to it. “When the Government is called upon to perform a function that requires an exercise of legislative, executive, or judicial power, only the vested recipient of that power can perform it.” Department of Transportation v. Association of American Railroads, 575 U. S. 43, 68 (2015) (Thomas, J., concurring in judgment). Because the Constitution gives the Executive Branch only “[t]he executive Power,” executive agencies may constitu- tionally exercise only that power. Art. II, § 1, cl. 1. But, Chevron gives agencies license to exercise judicial power. By allowing agencies to defnitively interpret laws so long as they are ambiguous, Chevron “transfer[s]” the Judiciary's “interpretive judgment to the agency.” Perez, 575 U. S., at 124 (opinion of Thomas, J.); see also Baldwin, 589 U. S., at 1240 (opinion of Thomas, J.); Michigan, 576 U. S., at 761–762 (opinion of Thomas, J.); post, at 18 (Gorsuch, J., concurring). Chevron deference “cannot be salvaged” by recasting it as deference to an agency's “formulation of policy.” Baldwin, 589 U. S., at 1239 (opinion of Thomas, J.) (internal quotation marks omitted). If that were true, Chevron would mean that “agencies are unconstitutionally exercising `legislative Powers' vested in Congress.” Baldwin, 589 U. S., at 1239 (opinion of Thomas, J.) (quoting Art. I, § 1). By “giv[ing] the force of law to agency pronouncements on matters of private conduct as to which Congress did not actually have an intent,” Chevron “permit[s] a body other than Congress to perform a function that requires an exercise of legislative power.” Michigan, 576 U. S., at 762 (opinion of Thomas, J.) (internal quotation marks omitted). No matter the gloss put on it, Chevron expands agencies' power beyond the 416 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Gorsuch, J., concurring

bounds of Article II by permitting them to exercise powers reserved to another branch of Government. Chevron deference was “not a harmless transfer of power.” Baldwin, 589 U. S., at 1239 (opinion of Thomas, J.). “The Constitution carefully imposes structural constraints on all three branches, and the exercise of power free of those ac- companying restraints subverts the design of the Constitu- tion's ratifers.” Id., at 1239–1240. In particular, the Founders envisioned that “the courts [would] check the Ex- ecutive by applying the correct interpretation of the law.” Id., at 1240. Chevron was thus a fundamental disruption of our separation of powers. It improperly strips courts of judicial power by simultaneously increasing the power of ex- ecutive agencies. By overruling Chevron, we restore this aspect of our separation of powers. To safeguard individual liberty, “[s]tructure is everything.” A. Scalia, Foreword: The Importance of Structure in Constitutional Interpreta- tion, 83 Notre Dame L. Rev. 1417, 1418 (2008). Although the Court fnally ends our 40-year misadventure with Chevron deference, its more profound problems should not be over- looked. Regardless of what a statute says, the type of def- erence required by Chevron violates the Constitution.

Justice Gorsuch, concurring. In disputes between individuals and the government about the meaning of a federal law, federal courts have tradition- ally sought to offer independent judgments about “what the law is” without favor to either side. Marbury v. Madison, 1 Cranch 137, 177 (1803). Beginning in the mid-1980s, how- ever, this Court experimented with a radically different ap- proach. Applying Chevron deference, judges began defer- ring to the views of executive agency offcials about the meaning of federal statutes. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837 (1984). With time, the error of this approach became widely appreciated. So much so that this Court has refused to Cite as: 603 U. S. 369 (2024) 417

apply Chevron deference since 2016. Today, the Court places a tombstone on Chevron no one can miss. In doing so, the Court returns judges to interpretive rules that have guided federal courts since the Nation's founding. I write separately to address why the proper application of the doc- trine of stare decisis supports that course.

I A Today, the phrase “common law judge” may call to mind a judicial titan of the past who brilliantly devised new legal rules on his own. The phrase “stare decisis” might conjure up a sense that judges who come later in time are strictly bound to follow the work of their predecessors. But neither of those intuitions fairly describes the traditional common- law understanding of the judge's role or the doctrine of stare decisis. At common law, a judge's charge to decide cases was not usually understood as a license to make new law. For much of England's early history, different rulers and different legal systems prevailed in different regions. As England consoli- dated into a single kingdom governed by a single legal sys- tem, the judge's task was to examine those pre-existing legal traditions and apply in the disputes that came to him those legal rules that were “common to the whole land and to all Englishmen.” F. Maitland, Equity, Also the Forms of Ac- tion at Common Law 2 (1929). That was “common law” judging. This view of the judge's role had consequences for the au- thority due judicial decisions. Because a judge's job was to fnd and apply the law, not make it, the “opinion of the judge” and “the law” were not considered “one and the same thing.” 1 W. Blackstone, Commentaries on the Laws of England 71 (1765) (Blackstone) (emphasis deleted). A judge's decision might bind the parties to the case at hand. M. Hale, The History and Analysis of the Common Law of England 68 418 LOPER BRIGHT ENTERPRISES v. RAIMONDO

(1713) (Hale). But none of that meant the judge had the power to “make a Law properly so called” for society at large, “for that only the King and Parliament can do.” Ibid. Other consequences followed for the role precedent played in future judicial proceedings. Because past decisions rep- resented something “less than a Law,” they did not bind fu- ture judges. Ibid. At the same time, as Matthew Hale put it, a future judge could give a past decision “Weight” as “Evi- dence” of the law. Ibid. Expressing the same idea, Wil- liam Blackstone conceived of judicial precedents as “evi- dence” of “the common law.” 1 Blackstone 69, 71. And much like other forms of evidence, precedents at common law were thought to vary in the weight due them. Some past decisions might supply future courts with considerable guidance. But others might be entitled to lesser weight, not least because judges are no less prone to error than anyone else and they may sometimes “mistake” what the law de- mands. Id., at 71 (emphasis deleted). In cases like that, both men thought, a future judge should not rotely repeat a past mistake but instead “vindicate” the law “from misrepre- sentation.” Id., at 70. When examining past decisions as evidence of the law, common law judges did not, broadly speaking, afford over- whelming weight to any “single precedent.” J. Baker, An Introduction to English Legal History 209–210 (5th ed. 2019). Instead, a prior decision's persuasive force depended in large measure on its “Consonancy and Congruity with Resolutions and Decisions of former Times.” Hale 68. An individual decision might refect the views of one court at one moment in time, but a consistent line of decisions repre- senting the wisdom of many minds across many generations was generally considered stronger evidence of the law's meaning. Ibid. With this conception of precedent in mind, Lord Mansfeld cautioned against elevating “particular cases” above the “general principles” that “run through the cases, and govern Cite as: 603 U. S. 369 (2024) 419

the decision of them.” Rust v. Cooper, 2 Cowp. 629, 632, 98 Eng. Rep. 1277, 1279 (K. B. 1777). By discarding aberra- tional rulings and pursuing instead the mainstream of past decisions, he observed, the common law tended over time to “wor[k] itself pure.” Omychund v. Barker, 1 Atk. 22, 33, 26 Eng. Rep. 15, 23 (Ch. 1744) (emphasis deleted). Refecting similar thinking, Edmund Burke offered fve principles for the evaluation of past judicial decisions: “They ought to be shewn; frst, to be numerous and not scattered here and there;—secondly, concurrent and not contradictory and mu- tually destructive;—thirdly, to be made in good and constitu- tional times;—fourthly, not to be made to serve an occa- sion;—and ffthly, to be agreeable to the general tenor of legal principles.” Speech of Dec. 23, 1790, in 3 The Speeches of the Right Honourable Edmund Burke 513 (1816). Not only did different decisions carry different weight, so did different language within a decision. An opinion's hold- ing and the reasoning essential to it (the ratio decidendi) merited careful attention. Dicta, stray remarks, and digres- sions warranted less weight. See N. Duxbury, The Intrica- cies of Dicta and Dissent 19–24 (2021) (Duxbury). These were no more than “the vapours and fumes of law.” F. Bacon, The Lord Keeper's Speech in the Exchequer (1617), in 2 The Works of Francis Bacon 478 (B. Montagu ed. 1887) (Bacon). That is not to say those “vapours” were worthless. Often dicta might provide the parties to a particular dispute a “ful- ler understanding of the court's decisional path or related areas of concern.” B. Garner et al., The Law of Judicial Precedent 65 (2016) (Precedent). Dicta might also provide future courts with a source of “thoughtful advice.” Ibid. But future courts had to be careful not to treat every “hasty expression . . . as a serious and deliberate opinion.” Steel v. Houghton, 1 Bl. H. 51, 53, 126 Eng. Rep. 32, 33 (C. P. 1788). To do so would work an “injustice to [the] memory” of their predecessors who could not expect judicial remarks issued in 420 LOPER BRIGHT ENTERPRISES v. RAIMONDO

one context to apply perfectly in others, perhaps especially ones they could not foresee. Ibid. Also, the limits of the adversarial process, a distinctive feature of English law, had to be borne in mind. When a single judge or a small panel reached a decision in a case, they did so based on the factual record and legal arguments the parties at hand have chosen to develop. Attuned to those constraints, future judges had to proceed with an open mind to the possibility that different facts and different legal arguments might dictate different outcomes in later disputes. See Duxbury 19–24.

B Necessarily, this represents just a quick sketch of tradi- tional common-law understandings of the judge's role and the place of precedent in it. It focuses, too, on the horizontal, not vertical, force of judicial precedents. But there are good reasons to think that the common law's understandings of judges and precedent outlined above crossed the Atlantic and informed the nature of the “judicial Power” the Constitution vests in federal courts. Art. III, § 1. Not only was the Constitution adopted against the back- drop of these understandings and, in light of that alone, they may provide evidence of what the framers meant when they spoke of the “judicial Power.” Many other, more specifc provisions in the Constitution refect much the same distinc- tion between lawmaking and lawfnding functions the com- mon law did. The Constitution provides that its terms may be amended only through certain prescribed democratic processes. Art. V. It vests the power to enact federal leg- islation exclusively in the people's elected representatives in Congress. Art. I, § 1. Meanwhile, the Constitution de- scribes the judicial power as the power to resolve cases and controversies. Art. III, § 2, cl. 1. As well, it delegates that authority to life-tenured judges, see § 1, an assignment that would have made little sense if judges could usurp lawmak- ing powers vested in periodically elected representatives. Cite as: 603 U. S. 369 (2024) 421

But one that makes perfect sense if what is sought is a neu- tral party “to interpret and apply” the law without fear or favor in a dispute between others. 2 The Works of James Wilson 161 (J. Andrews ed. 1896) (Wilson); see Osborn v. Bank of United States, 9 Wheat. 738, 866 (1824). The constrained view of the judicial power that runs through our Constitution carries with it familiar implica- tions, ones the framers readily acknowledged. James Madi- son, for example, proclaimed that it would be a “fallacy” to suggest that judges or their precedents could “repeal or alter” the Constitution or the laws of the United States. Letter to N. Trist (Dec. 1831), in 9 The Writings of James Madison 477 (G. Hunt ed. 1910). A court's opinion, James Wilson added, may be thought of as “effective la[w]” “[a]s to the parties.” Wilson 160–161. But as in England, Wilson said, a prior judicial decision could serve in a future dispute only as “evidence” of the law's proper construction. Id., at 160; accord, 1 J. Kent, Commentaries on American Law 442– 443 (1826). The framers also recognized that the judicial power de- scribed in our Constitution implies, as the judicial power did in England, a power (and duty) of discrimination when it comes to assessing the “evidence” embodied in past deci- sions. So, for example, Madison observed that judicial rul- ings “repeatedly confrmed” may supply better evidence of the law's meaning than isolated or aberrant ones. Letter to C. Ingersoll (June 1831), in 4 Letters and Other Writings of James Madison 184 (1867) (emphasis added). Extending the thought, Thomas Jefferson believed it would often take “nu- merous decisions” for the meaning of new statutes to become truly “settled.” Letter to S. Jones (July 1809), in 12 The Writings of Thomas Jefferson 299 (A. Bergh ed. 1907). From the start, too, American courts recognized that not everything found in a prior decision was entitled to equal weight. As Chief Justice Marshall warned, “It is a maxim not to be disregarded, that general expressions, in every 422 LOPER BRIGHT ENTERPRISES v. RAIMONDO

opinion, are to be taken in connection with the case in which those expressions are used.” Cohens v. Virginia, 6 Wheat. 264, 399 (1821). To the extent a past court offered views “beyond the case,” those expressions “may be respected” in a later case “but ought not to control the judgment.” Ibid. One “obvious” reason for this, Marshall continued, had to do with the limits of the adversarial process we inherited from England: Only “[t]he question actually before the Court is investigated with care, and considered in its full extent. Other principles which may serve to illustrate it, are consid- ered in their relation to the case decided, but their possible bearing on all other cases is seldom completely investigated.” Id., at 399–400. Abraham Lincoln championed these traditional under- standings in his debates with Stephen Douglas. Douglas took the view that a single decision of this Court—no matter how fawed—could defnitively resolve a contested issue for everyone and all time. Those who thought otherwise, he said, “aim[ed] a deadly blow to our whole Republican system of government.” Speech at Springfeld, Ill. (June 26, 1857), in 2 The Collected Works of Abraham Lincoln 401 (R. Bas- ler ed. 1953) (Lincoln Speech). But Lincoln knew better. While accepting that judicial decisions “absolutely deter- mine” the rights of the parties to a court's judgment, he re- fused to accept that any single judicial decision could “fully settl[e]” an issue, particularly when that decision departs from the Constitution. Id., at 400–401. In cases such as these, Lincoln explained, “it is not resistance, it is not fac- tious, it is not even disrespectful, to treat [the decision] as not having yet quite established a settled doctrine for the country.” Id., at 401. After the Civil War, the Court echoed some of these same points. It stressed that every statement in a judicial opin- ion “must be taken in connection with its immediate con- text,” In re Ayers, 123 U. S. 443, 488 (1887), and stray “re- marks” must not be elevated above the written law, see The Cite as: 603 U. S. 369 (2024) 423

Belfast, 7 Wall. 624, 641 (1869); see also, e. g., Trebilcock v. Wilson, 12 Wall. 687, 692–693 (1872); Mason v. Eldred, 6 Wall. 231, 236–238 (1868). During Chief Justice Chase's ten- ure, it seems a Justice writing the Court's majority opinion would generally work alone and present his work orally and in summary form to his colleagues at conference, which meant that other Justices often did not even review the opin- ion prior to publication. 6 C. Fairman, History of the Su- preme Court of the United States 69–70 (1971). The Court could proceed in this way because it understood that a single judicial opinion may resolve a “case or controversy,” and in so doing it may make “effective law” for the parties, but it does not legislate for the whole of the country and is not to be confused with laws that do.

C From all this, I see at least three lessons about the doc- trine of stare decisis relevant to the decision before us today. Each concerns a form of judicial humility. First, a past decision may bind the parties to a dispute, but it provides this Court no authority in future cases to depart from what the Constitution or laws of the United States ordain. Instead, the Constitution promises, the American people are sovereign and they alone may, through democratically responsive processes, amend our foundational charter or revise federal legislation. Unelected judges enjoy no such power. Part I–B, supra. Recognizing as much, this Court has often said that stare decisis is not an “ `inexorable command.' ” State Oil Co. v. Khan, 522 U. S. 3, 20 (1997). And from time to time it has found it necessary to correct its past mistakes. When it comes to correcting errors of constitutional interpretation, the Court has stressed the importance of doing so, for they can be corrected otherwise only through the amendment process. See, e. g., Franchise Tax Bd. of Cal. v. Hyatt, 587 U. S. 230, 248 (2019). When it comes to fxing errors of stat- 424 LOPER BRIGHT ENTERPRISES v. RAIMONDO

utory interpretation, the Court has proceeded perhaps more circumspectly. But in that feld, too, it has overruled even longstanding but “fawed” decisions. See, e. g., Leegin Cre- ative Leather Products, Inc. v. PSKS, Inc., 551 U. S. 877, 904, 907 (2007). Recent history illustrates all this. During the tenures of Chief Justices Warren and Burger, it seems this Court over- ruled an average of around three cases per Term, includ- ing roughly 50 statutory precedents between the 1960s and 1980s alone. See W. Eskridge, Overruling Statutory Prece- dents, 76 Geo. L. J. 1361, 1427–1434 (1988) (collecting cases). Many of these decisions came in settings no less consequen- tial than today's. In recent years, we have not approached the pace set by our predecessors, overruling an average of just one or two prior decisions each Term.1 But the point remains: Judicial decisions inconsistent with the written law do not inexorably control. Second, another lesson tempers the frst. While judicial decisions may not supersede or revise the Constitution or federal statutory law, they merit our “respect as embody- ing the considered views of those who have come before.” Ramos v. Louisiana, 590 U. S. 83, 105 (2020). As a matter of professional responsibility, a judge must not only avoid confusing his writings with the law. When a case comes be- fore him, he must also weigh his view of what the law de- mands against the thoughtful views of his predecessors. After all, “[p]recedent is a way of accumulating and passing down the learning of past generations, a font of established wisdom richer than what can be found in any single judge or panel of judges.” Precedent 9.

1 For relevant databases of decisions, see Congressional Research Serv- ice, Table of Supreme Court Decisions Overruled by Subsequent Decisions, Constitution Annotated, https://constitution.congress.gov/resources/ decisions-overruled/; see also H. Spaeth et al., 2023 Supreme Court Data- base, http://supremecourtdatabase.org. Cite as: 603 U. S. 369 (2024) 425

Doubtless, past judicial decisions may, as they always have, command “greater or less authority as precedents, ac- cording to circumstances.” Lincoln Speech 401. But, like English judges before us, we have long turned to familiar considerations to guide our assessment of the weight due a past decision. So, for example, as this Court has put it, the weight due a precedent may depend on the quality of its reasoning, its consistency with related decisions, its work- ability, and reliance interests that have formed around it. See Ramos, 590 U. S., at 106. The frst factor recognizes that the primary power of any precedent lies in its power to persuade—and poorly reasoned decisions may not provide reliable evidence of the law's meaning. The second factor refects the fact that a precedent is more likely to be correct and worthy of respect when it refects the time-tested wis- dom of generations than when it sits “unmoored” from sur- rounding law. Ibid. The remaining factors, like workabil- ity and reliance, do not often supply reason enough on their own to abide a fawed decision, for almost any past decision is likely to beneft some group eager to keep things as they are and content with how things work. See, e. g., id., at 108. But these factors can sometimes serve functions similar to the others, by pointing to clues that may suggest a past deci- sion is right in ways not immediately obvious to the individ- ual judge. When asking whether to follow or depart from a prece- dent, some judges deploy adverbs. They speak of whether or not a precedent qualifes as “demonstrably erroneous,” Gamble v. United States, 587 U. S. 678, 711 (2019) (Thomas, J., concurring), or “egregiously wrong,” Ramos, 590 U. S., at 121 (Kavanaugh, J., concurring in part). But the emphasis the adverb imparts is not meant for dramatic effect. It seeks to serve instead as a reminder of a more substantive lesson. The lesson that, in assessing the weight due a past decision, a judge is not to be guided by his own impression alone, but must self-consciously test his views against those 426 LOPER BRIGHT ENTERPRISES v. RAIMONDO

who have come before, open to the possibility that a prece- dent might be correct in ways not initially apparent to him. Third, it would be a mistake to read judicial opinions like statutes. Adopted through a robust and democratic process, statutes often apply in all their particulars to all persons. By contrast, when judges reach a decision in our adversarial system, they render a judgment based only on the factual record and legal arguments the parties at hand have chosen to develop. A later court assessing a past decision must therefore appreciate the possibility that different facts and different legal arguments may dictate a different outcome. They must appreciate, too, that, like anyone else, judges are “innately digressive,” and their opinions may sometimes offer stray asides about a wider topic that may sound nearly like legislative commands. Duxbury 4. Often, enterprising counsel seek to exploit such statements to maximum effect. See id., at 25. But while these digressions may sometimes contain valuable counsel, they remain “vapours and fumes of law,” Bacon 478, and cannot “control the judgment in a subsequent suit,” Cohens, 6 Wheat., at 399. These principles, too, have long guided this Court and oth- ers. As Judge Easterbrook has put it, an “opinion is not a comprehensive code; it is just an explanation for the Court's disposition. Judicial opinions must not be confused with statutes, and general expressions must be read in light of the subject under consideration.” United States v. Skoien, 614 F. 3d 638, 640 (CA7 2010) (en banc); see also Reiter v. Sonotone Corp., 442 U. S. 330, 341 (1979) (stressing that an opinion is not “a statute,” and its language should not “be parsed” as if it were); Nevada v. Hicks, 533 U. S. 353, 372 (2001) (same). If stare decisis counsels respect for the thinking of those who have come before, it also counsels against doing an “injustice to [their] memory” by overreli- ance on their every word. Steel, 1 Bl. H., at 53, 126 Eng. Rep., at 33. As judges, “[w]e neither expect nor hope that our successors will comb” through our opinions, searching Cite as: 603 U. S. 369 (2024) 427

for delphic answers to matters we never fully explored. Brown v. Davenport, 596 U. S. 118, 141 (2022). To proceed otherwise risks “turn[ing] stare decisis from a tool of judicial humility into one of judicial hubris.” Ibid.

II Turning now directly to the question what stare decisis effect Chevron deference warrants, each of these lessons seem to me to weigh frmly in favor of the course the Court charts today: Lesson 1, because Chevron deference contra- venes the law Congress prescribed in the Administrative Procedure Act. Lesson 2, because Chevron deference runs against mainstream currents in our law regarding the sepa- ration of powers, due process, and centuries-old interpretive rules that fortify those constitutional commitments. And Lesson 3, because to hold otherwise would effectively re- quire us to endow stray statements in Chevron with the au- thority of statutory language, all while ignoring more consid- ered language in that same decision and the teachings of experience. A Start with Lesson 1. The Administrative Procedure Act of 1946 (APA) directs a “reviewing court” to “decide all rele- vant questions of law” and “interpret” relevant “constitu- tional and statutory provisions.” 5 U. S. C. § 706. When applying Chevron deference, reviewing courts do not inter- pret all relevant statutory provisions and decide all relevant questions of law. Instead, judges abdicate a large measure of that responsibility in favor of agency offcials. Their in- terpretations of “ambiguous” laws control even when those interpretations are at odds with the fairest reading of the law an independent “reviewing court” can muster. Agency offcials, too, may change their minds about the law's mean- ing at any time, even when Congress has not amended the relevant statutory language in any way. National Cable & Telecommunications Assn. v. Brand X Internet Services, 428 LOPER BRIGHT ENTERPRISES v. RAIMONDO

545 U. S. 967, 982–983 (2005). And those offcials may even disagree with and effectively overrule not only their own past interpretations of a law but a court's past interpretation as well. Ibid. None of that is consistent with the APA's clear mandate. The hard fact is Chevron “did not even bother to cite” the APA, let alone seek to apply its terms. United States v. Mead Corp., 533 U. S. 218, 241 (2001) (Scalia, J., dissenting). Instead, as even its most ardent defenders have conceded, Chevron deference rests upon a “fctionalized statement of legislative desire,” namely, a judicial supposition that Con- gress implicitly wishes judges to defer to executive agencies' interpretations of the law even when it has said nothing of the kind. D. Barron & E. Kagan, Chevron's Nondelegation Doctrine, 2001 S. Ct. Rev. 201, 212 (Kagan) (emphasis added). As proponents see it, that fction represents a “policy judg- men[t] about what . . . make[s] for good government.” Ibid.2 But in our democracy unelected judges possess no authority to elevate their own fctions over the laws adopted by the Nation's elected representatives. Some might think the legal directive Congress provided in the APA unwise; some might think a different arrangement preferable. See, e. g., post, at 456–458 (Kagan, J., dissenting). But it is Con- gress's view of “good government,” not ours, that controls. Much more could be said about Chevron's inconsistency with the APA. But I have said it in the past. See Buffng- ton v. McDonough, 598 U. S. 1021, 1025 (2022) (opinion dis- senting from denial of certiorari); Gutierrez-Brizuela v. Lynch, 834 F. 3d 1142, 1151–1153 (CA10 2016) (concurring

2 See also A. Scalia, Judicial Deference to Administrative Interpretations of Law, 1989 Duke L. J. 511, 516–517 (1989) (describing Chevron's theory that Congress “delegat[ed]” interpretive authority to agencies as “fc- tional”); S. Breyer, Judicial Review of Questions of Law and Policy, 38 Admin. L. Rev. 363, 370 (1986) (describing the notion that there exists a “ `legislative intent to delegate the law-interpreting function' as a kind of legal fction”). Cite as: 603 U. S. 369 (2024) 429

opinion). And the Court makes many of the same points at length today. See ante, at 391–394. For present purposes, the short of it is that continuing to abide Chevron deference would require us to transgress the frst lesson of stare deci- sis—the humility required of judges to recognize that our decisions must yield to the laws adopted by the people's elected representatives.3 B Lesson 2 cannot rescue Chevron deference. If stare deci- sis calls for judicial humility in the face of the written law, it also cautions us to test our present conclusions carefully against the work of our predecessors. At the same time and as we have seen, this second form of humility counsels us to remember that precedents that have won the endorsement of judges across many generations, demonstrated coherence with our broader law, and weathered the tests of time and experience are entitled to greater consideration than those that have not. See Part I, supra. Viewed by each of these lights, the case for Chevron deference only grows weaker still. 1 Start with a look to how our predecessors traditionally understood the judicial role in disputes over a law's meaning. From the Nation's founding, they considered “[t]he interpre- tation of the laws” in cases and controversies “the proper

3 The dissent suggests that we need not take the APA's directions quite so seriously because the “fnest administrative law scholars” from Harvard claim to see in them some wiggle room. Post, at 464 (opinion of Kagan, J.). But nothing in the APA commands deference to the views of profes- sors any more than it does the government. Nor is the dissent's list of Harvard's fnest administrative law scholars entirely complete. See S. Breyer et al., Administrative Law and Regulatory Policy 288 (7th ed. 2011) (acknowledging that Chevron deference “seems in confict with . . . the apparently contrary language of § 706”); Kagan 212 (likewise acknowledg- ing Chevron deference rests upon a “fctionalized statement of legislative desire”). 430 LOPER BRIGHT ENTERPRISES v. RAIMONDO

and peculiar province of the courts.” The Federalist No. 78, p. 467 (C. Rossiter ed. 1961) (A. Hamilton). Perhaps the Court's most famous early decision refected exactly that view. There, Chief Justice Marshall declared it “emphati- cally the province and duty of the judicial department to say what the law is.” Marbury, 1 Cranch, at 177. For judges “have neither FORCE nor WILL but merely judgment”— and an obligation to exercise that judgment independently. The Federalist No. 78, at 465. No matter how “disagreeable that duty may be,” this Court has said, a judge “is not at liberty to surrender, or to waive it.” United States v. Dick- son, 15 Pet. 141, 162 (1841) (Story, J.). This duty of inde- pendent judgment is perhaps “the defning characteristi[c] of Article III judges.” Stern v. Marshall, 564 U. S. 462, 483 (2011). To be sure, this Court has also long extended “great re- spect” to the “contemporaneous” and consistent views of the coordinate branches about the meaning of a statute's terms. Edwards' Lessee v. Darby, 12 Wheat. 206, 210 (1827); see also McCulloch v. Maryland, 4 Wheat. 316, 401 (1819); Stuart v. Laird, 1 Cranch 299, 309 (1803).4 But traditionally, that did not mean a court had to “defer” to any “reasonable” con- struction of an “ambiguous” law that an executive agency might offer. It did not mean that the government could pro- pound a “reasonable” view of the law's meaning one day, a different one the next, and bind the judiciary always to its latest word. Nor did it mean the executive could displace a pre-existing judicial construction of a statute's terms, replace 4 Accord, National Lead Co. v. United States, 252 U. S. 140, 145–146 (1920) (affording “great weight” to a “contemporaneous construction” by the executive that had “been long continued”); Jacobs v. Prichard, 223 U. S. 200, 214 (1912) (“fnd[ing] no ambiguity in the act” but also fnding “strength” for the Court's interpretation in the executive's “immediate and continued construction of the act”); Schell's Executors v. Fauché, 138 U. S. 562, 572 (1891) (treating as “controlling” a “contemporaneous con- struction” of a law endorsed “not only [by] the courts but [also by] the departments”). Cite as: 603 U. S. 369 (2024) 431

it with its own, and effectively overrule a judicial precedent in the process. Put simply, this Court was “not bound” by any and all reasonable “administrative construction[s]” of ambiguous statutes when resolving cases and controversies. Burnet v. Chicago Portrait Co., 285 U. S. 1, 16 (1932). While the executive's consistent and contemporaneous views war- ranted respect, they “by no means control[led] the action or the opinion of this court in expounding the law with refer- ence to the rights of parties litigant before them.” Irvine v. Marshall, 20 How. 558, 567 (1858); see also A. Bamzai, The Origins of Judicial Deference to Executive Interpretation, 126 Yale L. J. 908, 987 (2017). Sensing how jarringly inconsistent Chevron is with this Court's many longstanding precedents discussing the nature of the judicial role in disputes over the law's meaning, the government and dissent struggle for a response. The best they can muster is a handful of cases from the early 1940s in which, they say, this Court frst “put [deference] principles into action.” Post, at 468 (Kagan, J., dissenting). And, ad- mittedly, for a period this Court toyed with a form of defer- ence akin to Chevron, at least for so-called mixed questions of law and fact. See, e. g., Gray v. Powell, 314 U. S. 402, 411– 412 (1941); NLRB v. Hearst Publications, Inc., 322 U. S. 111, 131 (1944). But, as the Court details, even that limited ex- periment did not last. See ante, at 387–389. Justice Rob- erts, in his Gray dissent, decried these decisions for “abdicat- [ing our] function as a court of review” and “complete[ly] revers[ing] . . . the normal and usual method of construing a statute.” 314 U. S., at 420–421. And just a few years later, in Skidmore v. Swift & Co., 323 U. S. 134 (1944), the Court returned to its time-worn path. Echoing themes that had run throughout our law from its start, Justice Robert H. Jackson wrote for the Court in Skidmore. There, he said, courts may extend respectful consideration to another branch's interpretation of the law, but the weight due those interpretations must always “de- 432 LOPER BRIGHT ENTERPRISES v. RAIMONDO

pend upon the[ir] thoroughness . . . , the validity of [their] reasoning, [their] consistency with earlier and later pro- nouncements, and all those factors which give [them] power to persuade.” Id., at 140. In another case the same year, and again writing for the Court, Justice Jackson expressly rejected a call for a judge-made doctrine of deference much like Chevron, offering that, “[i]f Congress had deemed it nec- essary or even appropriate” for courts to “defe[r] to adminis- trative construction[,] . . . it would not have been at a loss for words to say so.” Davies Warehouse Co. v. Bowles, 321 U. S. 144, 156 (1944). To the extent proper respect for precedent demands, as it always has, special respect for longstanding and mainstream decisions, Chevron scores badly. It represented not a con- tinuation of a long line of decisions but a break from them. Worse, it did not merely depart from our precedents. More nearly, Chevron defed them.

Page Proof Pending 2 Publication Consider next how uneasily Chevron deference sits along- side so many other settled aspects of our law. Having wit- nessed frst-hand King George's efforts to gain infuence and control over colonial judges, see Declaration of Independence ¶11, the framers made a considered judgment to build ju- dicial independence into the Constitution's design. They vested the judicial power in decisionmakers with life tenure. Art. III, § 1. They placed the judicial salary beyond political control during a judge's tenure. Ibid. And they rejected any proposal that would subject judicial decisions to review by political actors. The Federalist No. 81, at 482; United States v. Hansen, 599 U. S. 762, 786–791 (2023) (Thomas, J., concurring). All of this served to ensure the same thing: “A fair trial in a fair tribunal.” In re Murchison, 349 U. S. 133, 136 (1955). One in which impartial judges, not those cur- rently wielding power in the political branches, would “say Cite as: 603 U. S. 369 (2024) 433

what the law is” in cases coming to court. Marbury, 1 Cranch, at 177. Chevron deference undermines all that. It precludes courts from exercising the judicial power vested in them by Article III to say what the law is. It forces judges to aban- don the best reading of the law in favor of views of those presently holding the reins of the Executive Branch. It re- quires judges to change, and change again, their interpreta- tions of the law as and when the government demands. And that transfer of power has exactly the sort of consequences one might expect. Rather than insulate adjudication from power and politics to ensure a fair hearing “without respect to persons” as the federal judicial oath demands, 28 U. S. C. § 453, Chevron deference requires courts to “place a fn- ger on the scales of justice in favor of the most powerful of litigants, the federal government.” Buffngton, 598 U. S., at 1028. Along the way, Chevron deference guarantees “sys- tematic bias” in favor of whichever political party currently holds the levers of executive power. P. Hamburger, Chev- ron Bias, 84 Geo. Wash. L. Rev. 1187, 1212 (2016). Chevron deference undermines other aspects of our settled law, too. In this country, we often boast that the Constitu- tion's promise of due process of law, see Amdts. 5, 14, means that “ `no man can be a judge in his own case.' ” Williams v. Pennsylvania, 579 U. S. 1, 8–9 (2016); Calder v. Bull, 3 Dall. 386, 388 (1798) (opinion of Chase, J.). That principle, of course, has even deeper roots, tracing far back into the common law where it was known by the Latin maxim nemo iudex in causa sua. See 1 E. Coke, Institutes of the Laws of England § 212, *141a. Yet, under the Chevron regime, all that means little, for executive agencies may effectively judge the scope of their own lawful powers. See, e. g., Ar- lington v. FCC, 569 U. S. 290, 296–297 (2013). Traditionally, as well, courts have sought to construe stat- utes as a reasonable reader would “when the law was made.” 434 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Blackstone 59; see United States v. Fisher, 2 Cranch 358, 386 (1805). Today, some call this “textualism.” But really it's a very old idea, one that constrains judges to a lawfnding rather than lawmaking role by focusing their work on the statutory text, its linguistic context, and various canons of construction. In that way, textualism serves as an essen- tial guardian of the due process promise of fair notice. If a judge could discard an old meaning and assign a new one to a law's terms, all without any legislative revision, how could people ever be sure of the rules that bind them? New Prime Inc. v. Oliveira, 586 U. S. 105, 113 (2019). Were the rules otherwise, Blackstone warned, the people would be rendered “slaves to their magistrates.” 4 Blackstone 371. Yet, replace “magistrates” with “bureaucrats,” and Black- stone's fear becomes reality when courts employ Chevron deference. Whenever we confront an ambiguity in the law, judges do not seek to resolve it impartially according to the best evidence of the law's original meaning. Instead, we re- sort to a far cruder heuristic: “The reasonable bureaucrat always wins.” And because the reasonable bureaucrat may change his mind year-to-year and election-to-election, the people can never know with certainty what new “interpreta- tions” might be used against them. This “fuid” approach to statutory interpretation is “as much of a trap for the inno- cent as the ancient laws of Caligula,” which were posted so high up on the walls and in print so small that ordinary peo- ple could never be sure what they required. United States v. Cardiff, 344 U. S. 174, 176 (1952). The ancient rule of lenity is still another of Chevron's vic- tims. Since the founding, American courts have construed ambiguities in penal laws against the government and with lenity toward affected persons. Wooden v. United States, 595 U. S. 360, 388–390 (2022) (Gorsuch, J., concurring in judgment). That principle upholds due process by safe- guarding individual liberty in the face of ambiguous laws. Cite as: 603 U. S. 369 (2024) 435

Ibid. And it fortifes the separation of powers by keeping the power of punishment frmly “ `in the legislative, not in the judicial department.' ” Id., at 391 (quoting United States v. Wiltberger, 5 Wheat. 76, 95 (1820)). But power begets power. And pressing Chevron deference as far as it can go, the government has sometimes managed to leverage “ambi- guities” in the written law to penalize conduct Congress never clearly proscribed. Compare Guedes v. ATF, 920 F. 3d 1, 27–28, 31 (CADC 2019), with Garland v. Cargill, 602 U. S. 406 (2024). In all these ways, Chevron's fction has led us to a strange place. One where authorities long thought reserved for Ar- ticle III are transferred to Article II, where the scales of justice are tilted systematically in favor of the most power- ful, where legal demands can change with every election even though the laws do not, and where the people are left to guess about their legal rights and responsibilities. So much tension with so many foundational features of our legal order is surely one more sign that we have “taken a wrong turn along the way.” Kisor v. Wilkie, 588 U. S. 558, 607 (2019) (Gorsuch, J., concurring in judgment).5 5 The dissent suggests that Chevron deference bears at least something in common with surrounding law because it resembles a presumption or traditional canon of construction, and both “are common.” Post, at 455, n. 1, 473–474 (opinion of Kagan, J.). But even that thin reed wavers at a glance. Many of the presumptions and interpretive canons the dissent cites—in- cluding lenity, contra proferentem, and others besides—“ `embod[y] . . . legal doctrine[s] centuries older than our Republic.' ” Opati v. Republic of Sudan, 590 U. S. 418, 425 (2020). Chevron deference can make no such boast. Many of the presumptions and canons the dissent cites also serve the Constitution, protecting the lines of authority it draws. Take just two examples: The federalism canon tells courts to presume federal statutes do not preempt state laws because of the sovereignty States enjoy under the Constitution. Bond v. United States, 572 U. S. 844, 858 (2014). The presumption against retroactivity serves as guardian of the Constitution's promise of due process and its ban on ex post facto laws, Landgraf v. USI Film Products, 511 U. S. 244, 265 (1994). Once more, however, Chevron deference can make no similar claim. Rather than serve the Constitu- 436 LOPER BRIGHT ENTERPRISES v. RAIMONDO

3 Finally, consider workability and reliance. If, as I have sought to suggest, these factors may sometimes serve as use- ful proxies for the question whether a precedent comports with the historic tide of judicial practice or represents an aberrational mistake, see Part I–C, supra, they certainly do here. Take Chevron's “workability.” Throughout its short life, this Court has been forced to supplement and revise Chevron so many times that no one can agree on how many “steps” it requires, nor even what each of those “steps” entails. Some suggest that the analysis begins with “step zero” (perhaps itself a tell), an innovation that traces to United States v. Mead Corp., 533 U. S. 218. Mead held that, before even con- sidering whether Chevron applies, a court must determine whether Congress meant to delegate to the agency authority to interpret the law in a given feld. 533 U. S., at 226–227. But that exercise faces an immediate challenge: Because Chevron depends on a judicially implied, rather than a legis- latively expressed, delegation of interpretive authority to an executive agency, Part II–A, supra, when should the fction apply and when not? Mead fashioned a multifactor test for judges to use. 533 U. S., at 229–231. But that test has proved as indeterminate in application as it was contrived in origin. Perhaps for these reasons, perhaps for others, this Court has sometimes applied Mead and often ignored it. See Brand X, 545 U. S., at 1014, n. 8 (Scalia, J., dissenting). Things do not improve as we move up the Chevron ladder. At “step one,” a judge must defer to an executive offcial's interpretation when the statute at hand is “ambiguous.”

tion's usual rule that litigants are entitled to have an independent judge interpret disputed legal terms, Chevron deference works to undermine that promise. As explored above, too, Chevron deference sits in tension with many traditional legal presumptions and interpretive principles, rep- resenting nearly the inverse of the rules of lenity, nemo iudex, and con- tra proferentem. Cite as: 603 U. S. 369 (2024) 437

But even today, Chevron's principal benefciary—the federal government—still cannot say when a statute is suffciently ambiguous to trigger deference. See, e. g., Tr. of Oral Arg. in American Hospital Assn. v. Becerra, O. T. 2021, No. 20– 1114, pp. 71–72. Perhaps thanks to this particular confusion, the search for ambiguity has devolved into a sort of Snark hunt: Some judges claim to spot it almost everywhere, while other equally fne judges claim never to have seen it. Com- pare L. Silberman, Chevron—The Intersection of Law & Pol- icy, 58 Geo. Wash. L. Rev. 821, 826 (1990), with R. Kethledge, Ambiguities and Agency Cases: Refections After (Almost) Ten Years on the Bench, 70 Vand. L. Rev. En Banc 315, 323 (2017). Nor do courts agree when it comes to “step two.” There, a judge must assess whether an executive agency's interpre- tation of an ambiguous statute is “reasonable.” But what does that inquiry demand? Some courts engage in a com- paratively searching review; others almost refexively defer to an agency's views. Here again, courts have pursued “wil- dly different” approaches and reached wildly different con- clusions in similar cases. See B. Kavanaugh, Fixing Statu- tory Interpretation, 129 Harv. L. Rev. 2118, 2152 (2016) (Kavanaugh). Today's cases exemplify some of these problems. We have before us two circuit decisions, three opinions, and at least as many interpretive options on the Chevron menu. On the one hand, we have the D. C. Circuit majority, which deemed the Magnuson-Stevens Act “ambiguous” and upheld the agency's regulation as “ `permissible.' ” 45 F. 4th 359, 365 (2022). On the other hand, we have the D. C. Circuit dissent, which argues the statute is “unambiguou[s]” and that it plainly forecloses the agency's new rule. Id., at 372 (opinion of Walker, J.). And on yet a third hand, we have the First Circuit, which claimed to have identifed “clear textual support” for the regulation, yet refused to say whether it would “classify [its] conclusion as a product of Chevron step 438 LOPER BRIGHT ENTERPRISES v. RAIMONDO

one or step two.” 62 F. 4th 621, 631, 634 (2023). As these cases illustrate, Chevron has turned statutory interpretation into a game of bingo under blindfold, with parties guessing at how many boxes there are and which one their case might ultimately fall in. Turn now from workability to reliance. Far from engen- dering reliance interests, the whole point of Chevron defer- ence is to upset them. Under Chevron, executive offcials can replace one “reasonable” interpretation with another at any time, all without any change in the law itself. The re- sult: Affected individuals “can never be sure of their legal rights and duties.” Buffngton, 598 U. S., at 1030. How bad is the problem? Take just one example. Brand X concerned a law regulating broadband internet services. There, the Court upheld an agency rule adopted by the ad- ministration of President George W. Bush because it was premised on a “reasonable” interpretation of the statute. Later, President Barack Obama's administration rescinded the rule and replaced it with another. Later still, during President Donald J. Trump's administration, offcials re- placed that rule with a different one, all before President Joseph R. Biden, Jr.'s administration declared its intention to reverse course for yet a fourth time. See Safeguarding and Securing the Open Internet, 88 Fed. Reg. 76048 (2023); Brand X, 545 U. S., at 981–982. Each time, the government claimed its new rule was just as “reasonable” as the last. Rather than promoting reliance by fxing the meaning of the law, Chevron deference engenders constant uncertainty and convulsive change even when the statute at issue itself re- mains unchanged. Nor are these antireliance harms distributed equally. So- phisticated entities and their lawyers may be able to keep pace with rule changes affecting their rights and responsibil- ities. They may be able to lobby for new “ `reasonable' ” agen- cy interpretations and even capture the agencies that issue them. Buffngton, 598 U. S., at 1027, 1031. But ordinary Cite as: 603 U. S. 369 (2024) 439

people can do none of those things. They are the ones who suffer the worst kind of regulatory whiplash Chevron invites. Consider a couple of examples. Thomas Buffngton, a vet- eran of the U. S. Air Force, was injured in the line of duty. For a time after he left the Air Force, the Department of Veterans Affairs (VA) paid disability benefts due him by law. But later the government called on Mr. Buffngton to reenter active service. During that period, everyone agreed, the VA could (as it did) suspend his disability payments. After he left active service for a second time, however, the VA turned his patriotism against him. By law, Congress per- mitted the VA to suspend disability pay only “for any period for which [a servicemember] receives active service pay.” 38 U. S. C. § 5304(c). But the VA had adopted a self-serving regulation requiring veterans to fle a form asking for the resumption of their disability pay after a second (or subse- quent) stint in active service. 38 CFR § 3.654(b)(2) (2021). Unaware of the regulation, Mr. Buffngton failed to reapply immediately. When he fnally fgured out what had hap- pened and reapplied, the VA agreed to resume payments going forward but refused to give Mr. Buffngton all of the past disability payments it had withheld. Buffngton, 598 U. S., at 1022–1024. Mr. Buffngton challenged the agency's action as inconsist- ent with Congress's direction that the VA may suspend dis- ability payments only for those periods when a veteran re- turns to active service. But armed with Chevron, the agency defeated Mr. Buffngton's claim. Maybe the self- serving regulation the VA cited as justifcation for its action was not premised on the best reading of the law, courts said, but it represented a “ `permissible' ” one. 598 U. S., at 1026. In that way, the Executive Branch was able to evade Con- gress's promises to someone who took the feld repeatedly in the Nation's defense. In another case, one which I heard as a court of appeals judge, De Niz Robles v. Lynch, 803 F. 3d 1165 (CA10 2015), 440 LOPER BRIGHT ENTERPRISES v. RAIMONDO

the Board of Immigration Appeals invoked Chevron to over- rule a judicial precedent on which many immigrants had re- lied, see In re Briones, 24 I. & N. Dec. 355, 370 (BIA 2007) (purporting to overrule Padilla–Caldera v. Gonzales, 426 F. 3d 1294 (CA10 2005)). The agency then sought to apply its new interpretation retroactively to punish those immigrants—including Alfonzo De Niz Robles, who had re- lied on that judicial precedent as authority to remain in this country with his U. S. wife and four children. See 803 F. 3d, at 1168–1169. Our court ruled that this retrospective appli- cation of the BIA's new interpretation of the law violated Mr. De Niz Robles's due process rights. Id., at 1172. But as a lower court, we could treat only the symptom, not the disease. So Chevron permitted the agency going forward to overrule a judicial decision about the best reading of the law with its own different “reasonable” one and in that way deny relief to countless future immigrants. Those are just two stories among so many that federal judges could tell (and have told) about what Chevron defer- ence has meant for ordinary people interacting with the fed- eral government. See, e. g., Lambert v. Saul, 980 F. 3d 1266, 1268–1276 (CA9 2020); Valent v. Commissioner of Social Se- curity, 918 F. 3d 516, 525–527 (CA6 2019) (Kethledge, J., dis- senting); Gonzalez v. United States Atty. Gen., 820 F. 3d 399, 402–405 (CA11 2016) (per curiam). What does the federal government have to say about this? It acknowledges that Chevron sits as a heavy weight on the scale in favor of the government, “oppositional” to many “categories of individuals.” Tr. of Oral Arg. in No. 22–1219, p. 133 (Relentless Tr.). But, according to the government, Chevron deference is too important an innovation to undo. In its brief reign, the government says, it has become a “fun- damenta[l] . . . ground rul[e] for how all three branches of the government are operating together.” Relentless Tr. 102. But, in truth, the Constitution, the APA, and our long- standing precedents set those ground rules some time ago. Cite as: 603 U. S. 369 (2024) 441

And under them, agencies cannot invoke a judge-made fction to unsettle our Nation's promise to individuals that they are entitled to make their arguments about the law's demands on them in a fair hearing, one in which they stand on equal footing with the government before an independent judge.

C How could a Court, guided for 200 years by Chief Justice Marshall's example, come to embrace a counter-Marbury revolution, one at war with the APA, time honored prece- dents, and so much surrounding law? To answer these ques- tions, turn to Lesson 3 and witness the temptation to endow a stray passage in a judicial decision with extraordinary au- thority. Call it “power quoting.” Chevron was an unlikely place for a revolution to begin. The case concerned the Clean Air Act's requirement that States regulate “stationary sources” of air pollution in their borders. See 42 U. S. C. § 7401 et seq. At the time, it was an open question whether entire industrial plants or their constituent polluting parts counted as “stationary sources.” The Environmental Protection Agency had defned entire plants as sources, an approach that allowed companies to re- place individual plant parts without automatically triggering the permitting requirements that apply to new sources. Chevron, 467 U. S., at 840. This Court upheld the EPA's defnition as consistent with the governing statute. Id., at 866. The decision, issued by a bare quorum of the Court, without concurrence or dissent, purported to apply “well-settled principles.” Id., at 845. “If a court, employing traditional tools of statutory construc- tion, ascertains that Congress had an intention on the precise question at issue,” Chevron provided, then “that intention is the law and must be given effect.” Id., at 843, n. 9. Many of the cases Chevron cited to support its judgment stood for the traditional proposition that courts afford respectful con- sideration, not deference, to executive interpretations of the 442 LOPER BRIGHT ENTERPRISES v. RAIMONDO

law. See, e. g., Burnet, 285 U. S., at 16; United States v. Moore, 95 U. S. 760, 763 (1878). And the decision's sole cita- tion to legal scholarship was to Roscoe Pound, who long championed de novo judicial review. 467 U. S., at 843, n. 10; see R. Pound, The Place of the Judiciary in a Democratic Polity, 27 A. B. A. J. 133, 136–137 (1941). At the same time, of course, the opinion contained bits and pieces that spoke differently. The decision also said that, “if [a] statute is silent or ambiguous with respect to [a] specifc issue, the question for the court is whether the agency's answer is based on a permissible construction of the statute.” 467 U. S., at 843. But it seems the government didn't advance this formulation in its brief, so there was no adver- sarial engagement on it. T. Merrill, The Story of Chevron: The Making of an Accidental Landmark, 66 Admin. L. Rev. 253, 268 (2014) (Merrill). As we have seen, too, the Court did not pause to consider (or even mention) the APA. See Part II–A, supra. It did not discuss con- trary precedents issued by the Court since the founding, let alone purport to overrule any of them. See Part II– B–1, supra. Nor did the Court seek to address how its novel rule of deference might be squared with so much sur- rounding law. See Part II–B–2, supra. As even its defend- ers have acknowledged, “Chevron barely bothered to justify its rule of deference, and the few brief passages on this mat- ter pointed in disparate directions. ” Kagan 212–213. “[T]he quality of the reasoning,” they acknowledge, “was not high,” C. Sunstein, Chevron as Law, 107 Geo. L. J. 1613, 1669 (2019). If Chevron meant to usher in a revolution in how judges interpret laws, no one appears to have realized it at the time. Chevron's author, Justice Stevens, characterized the decision as a “simpl[e] . . . restatement of existing law, nothing more or less.” Merrill 255, 275. In the “19 argued cases” in the following Term “that presented some kind of question about whether the Court should defer to an agency interpretation of statutory law,” this Court cited Chevron just once. Mer- Cite as: 603 U. S. 369 (2024) 443

rill 276. By some accounts, the decision seemed “destined to obscurity.” Ibid. It was only three years later when Justice Scalia wrote a concurrence that a revolution began to take shape. Buffng- ton, 598 U. S., at 1027. There, he argued for a new rule requiring courts to defer to executive agency interpretations of the law whenever a “ `statute is silent or ambiguous.' ” NLRB v. Food & Commercial Workers, 484 U. S. 112, 133– 134 (1987) (opinion of Scalia, J.). Eventually, a majority of the Court followed his lead. Buffngton, 598 U. S., at 1027. But from the start, Justice Scalia made no secret about the scope of his ambitions. See Judicial Deference to Adminis- trative Interpretations of Law, 1989 Duke L. J. 511, 521 (1989) (Scalia). The rule he advocated for represented such a sharp break from prior practice, he explained, that many judges of his day didn't yet “understand” the “old criteria” were “no longer relevant.” Ibid. Still, he said, overthrow- ing the past was worth it because a new deferential rule would be “easier to follow.” Ibid. Events proved otherwise. As the years wore on and the Court's new and aggressive reading of Chevron gradually exposed itself as unworkable, unfair, and at odds with our separation of powers, Justice Scalia could have doubled down on the project. But he didn't. He appreciated that stare decisis is not a rule of “if I thought it yesterday, I must think it tomorrow.” And rather than cling to the pride of personal precedent, the Justice began to express doubts over the very project that he had worked to build. See Perez v. Mortgage Bankers Assn., 575 U. S. 92, 109–110 (2015) (opinion concur- ring in judgment); cf. Decker v. Northwest Environmental Defense Center, 568 U. S. 597, 617–618, 621 (2013) (opinion concurring in part and dissenting in part). If Chevron's as- cent is a testament to the Justice's ingenuity, its demise is an even greater tribute to his humility.6 6 It should be recalled that, when Justice Scalia launched the Chevron revolution, there were many judges who “abhor[red] . . . `plain meaning' ” and preferred instead to elevate “legislative history” and their own cu- 444 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Justice Scalia was not alone in his reconsideration. After years spent laboring under Chevron, trying to make sense of it and make it work, Member after Member of this Court came to question the project. See, e. g., Pereira v. Sessions, 585 U. S. 198, 219–221 (2018) (Kennedy, J., concurring); Mich- igan v. EPA, 576 U. S. 743, 760–764 (2015) (Thomas, J., con- curring); Kisor, 588 U. S., at 591 (Roberts, C. J., concurring in part); Gutierrez-Brizuela, 834 F. 3d, at 1153; Buffngton, 598 U. S., at 1032–1033; Kavanaugh 2150–2154. Ultimately, the Court gave up. Despite repeated invitations, it has not applied Chevron deference since 2016. Relentless Tr. 81; App. to Brief for Respondents in No. 22–1219, p. 68a. So an experiment that began only in the mid-1980s effectively ended eight years ago. Along the way, an unusually large number of federal appellate judges voiced their own thought- ful and extensive criticisms of Chevron. Buffngton, 598 U. S., at 1032–1033 (collecting examples). A number of state courts did, too, refusing to import Chevron deference into their own administrative law jurisprudence. See 598 U. S., at 1032. Even if all that and everything else laid out above is true, the government suggests we should retain Chevron de- ference because judges simply cannot live without it; some statutes are just too “technical” for courts to interpret “in- telligently.” Post, at 456, 478–479 (dissenting opinion). But that objection is no answer to Chevron's inconsistency with Congress's directions in the APA, so much surrounding law, or the challenges its multistep regime have posed in practice.

rated accounts of a law's “purpose[s]” over enacted statutory text. Scalia 515, 521. Chevron, he predicted, would provide a new guardrail against that practice. Scalia 515, 521. As the Justice's later writings show, he had the right diagnosis, just the wrong cure. The answer for judges elid- ing statutory terms is not deference to agencies that may seek to do the same, but a demand that all return to a more faithful adherence to the written law. That was, of course, another project Justice Scalia champi- oned. And as we like to say, “we're all textualists now.” Cite as: 603 U. S. 369 (2024) 445

Nor does history counsel such defeatism. Surely, it would be a mistake to suggest our predecessors before Chevron's rise in the mid-1980s were unable to make their way intel- ligently through technical statutory disputes. Following their lead, over the past eight years this Court has managed to resolve even highly complex cases without Chevron defer- ence, and done so even when the government sought defer- ence. Nor, as far as I am aware, did any Member of the Court suggest Chevron deference was necessary to an intelli- gent resolution of any of those matters.7 If anything, by affording Chevron deference a period of repose before ad- dressing whether it should be retained, the Court has en- abled its Members to test the propriety of that precedent and refect more deeply on how well it fts into the broader architecture of our law. Others may see things differently, see post, at 473 (dissenting opinion), but the caution the Court has exhibited before overruling Chevron may illus- trate one of the reasons why the current Court has been slower to overrule precedents than some of its predecessors, see Part I–C, supra. None of this, of course, discharges any Member of this Court from the task of deciding for himself or herself today whether Chevron deference itself warrants deference. But when so many past and current judicial colleagues in this Court and across the country tell us our doctrine is mis- guided, and when we ourselves managed without Chevron for centuries and manage to do so today, the humility at the core of stare decisis compels us to pause and refect carefully on the wisdom embodied in that experience. And, in the end, to my mind the lessons of experience counsel wisely

7 See, e. g., Becerra v. Empire Health Foundation, for Valley Hospital Medical Center, 597 U. S. 424, 434 (2022) (resolving intricate Medicare dispute by reference solely to “text,” “context,” and “structure”); see also Sackett v. EPA, 598 U. S. 651 (2023) (same in a complex Clean Water Act dispute); Johnson v. Guzman Chavez, 594 U. S. 523 (2021) (same in techni- cal immigration case). 446 LOPER BRIGHT ENTERPRISES v. RAIMONDO

against continued reliance on Chevron's stray and unconsid- ered digression. This Court's opinions fll over 500 volumes, and perhaps “some printed judicial word may be found to support almost any plausible proposition.” R. Jackson, De- cisional Law and Stare Decisis, 30 A. B. A. J. 334 (1944). It is not for us to pick and choose passages we happen to like and demand total obedience to them in perpetuity. That would turn stare decisis from a doctrine of humility into a tool for judicial opportunism. Brown, 596 U. S., at 141.

III Proper respect for precedent helps “keep the scale of jus- tice even and steady,” by reinforcing decisional rules consist- ent with the law upon which all can rely. 1 Blackstone 69. But that respect does not require, nor does it readily toler- ate, a steadfast refusal to correct mistakes. As early as 1810, this Court had already overruled one of its cases. See Hudson v. Guestier, 6 Cranch 281, 284 (overruling Rose v. Himely, 4 Cranch 241 (1808)). In recent years, the Court may have overruled precedents less frequently than it did during the Warren and Burger Courts. See Part I–C, supra. But the job of reconsidering past decisions re- mains one every Member of this Court faces from time to time.8 8 Today's dissenters are no exceptions. They have voted to overrule precedents that they consider “wrong,” Hurst v. Florida, 577 U. S. 92, 101 (2016) (opinion for the Court by Sotomayor, J., joined by, inter alios, Kagan, J.); Obergefell v. Hodges, 576 U. S. 644, 665, 675 (2015) (opinion for the Court, joined by, inter alios, Sotomayor and Kagan, JJ.); that confict with the Constitution's “original meaning,” Alleyne v. United States, 570 U. S. 99, 118 (2013) (Sotomayor, J., joined by, inter alios, Kagan, J., con- curring); and that have proved “unworkable,” Johnson v. United States, 576 U. S. 591, 605 (2015) (opinion for the Court, joined by, inter alios, Sotomayor and Kagan, JJ.); see also Erlinger v. United States, 602 U. S. 821, 872 (2024) (Jackson, J., dissenting) (arguing Apprendi v. New Jersey, 530 U. S. 466 (2000), and the many cases applying it were all “wrongly decided”). Cite as: 603 U. S. 369 (2024) 447

Justice William O. Douglas served longer on this Court than any other person in the Nation's history. During his tenure, he observed how a new colleague might be inclined initially to “revere” every word written in an opinion issued before he arrived. W. Douglas, Stare Decisis, 49 Colum. L. Rev. 735, 736 (1949). But, over time, Justice Douglas re- fected, his new colleague would “remembe[r] . . . that it is the Constitution which he swore to support and defend, not the gloss which his predecessors may have put on it.” Ibid. And “[s]o he [would] com[e] to formulate his own views, re- jecting some earlier ones as false and embracing others.” Ibid. This process of reexamination, Justice Douglas ex- plained, is a “necessary consequence of our system” in which each judge takes an oath—both “personal” and binding—to discern the law's meaning for himself and apply it faithfully in the cases that come before him. Id., at 736–737. Justice Douglas saw, too, how appeals to precedent could be overstated and sometimes even overwrought. Judges, he refected, would sometimes frst issue “new and startling de- cision[s],” and then later spin around and “acquire an acute conservatism” in their aggressive defense of “their new sta- tus quo.” Id., at 737. In that way, even the most novel and unlikely decisions became “coveted anchorage[s],” defended heatedly, if ironically, under the banner of “stare decisis.” Ibid.; see also Edwards v. Vannoy, 593 U. S. 255, 294, n. 7 (2021) (Gorsuch, J., concurring). That is Chevron's story: A revolution masquerading as the status quo. And the defense of it follows the same course Justice Douglas described. Though our dissenting col- leagues have not hesitated to question other precedents in the past, they today manifest what Justice Douglas called an “acute conservatism” for Chevron's “startling” development, insisting that if this “coveted anchorage” is abandoned the heavens will fall. But the Nation managed to live with busy executive agencies of all sorts long before the Chevron revo- lution began to take shape in the mid-1980s. And all today's 448 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Kagan, J., dissenting

decision means is that, going forward, federal courts will do exactly as this Court has since 2016, exactly as it did before the mid-1980s, and exactly as it had done since the founding: resolve cases and controversies without any systemic bias in the government's favor. Proper respect for precedent does not begin to suggest otherwise. Instead, it counsels respect for the written law, adherence to consistent teachings over aberrations, and re- sistance to the temptation of treating our own stray remarks as if they were statutes. And each of those lessons points toward the same conclusion today: Chevron deference is in- consistent with the directions Congress gave us in the APA. It represents a grave anomaly when viewed against the sweep of historic judicial practice. The decision undermines core rule-of-law values ranging from the promise of fair no- tice to the promise of a fair hearing. Even on its own terms, it has proved unworkable and operated to undermine rather than advance reliance interests, often to the detriment of ordinary Americans. And from the start, the whole project has relied on the overaggressive use of snippets and stray remarks from an opinion that carried mixed messages. Stare decisis's true lesson today is not that we are bound to respect Chevron's “startling development,” but bound to inter it. Justice Kagan, with whom Justice Sotomayor and Justice Jackson join,* dissenting. For 40 years, Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837 (1984), has served as a cornerstone of administrative law, allocating responsibility for statutory construction between courts and agencies. Under Chevron, a court uses all its normal interpretive tools to determine whether Congress has spoken to an issue. If

*Justice Jackson did not participate in the consideration or decision of the case in No. 22–451 and joins this opinion only as it applies to the case in No. 22–1219. Cite as: 603 U. S. 369 (2024) 449

the court fnds Congress has done so, that is the end of the matter; the agency's views make no difference. But if the court fnds, at the end of its interpretive work, that Congress has left an ambiguity or gap, then a choice must be made. Who should give content to a statute when Congress's in- structions have run out? Should it be a court? Or should it be the agency Congress has charged with administering the statute? The answer Chevron gives is that it should usually be the agency, within the bounds of reasonableness. That rule has formed the backdrop against which Congress, courts, and agencies—as well as regulated parties and the public—all have operated for decades. It has been applied in thousands of judicial decisions. It has become part of the warp and woof of modern government, supporting regula- tory efforts of all kinds—to name a few, keeping air and water clean, food and drugs safe, and fnancial markets honest. And the rule is right. This Court has long understood Chevron deference to refect what Congress would want, and so to be rooted in a presumption of legislative intent. Con- gress knows that it does not—in fact cannot—write perfectly complete regulatory statutes. It knows that those statutes will inevitably contain ambiguities that some other actor will have to resolve, and gaps that some other actor will have to fll. And it would usually prefer that actor to be the respon- sible agency, not a court. Some interpretive issues arising in the regulatory context involve scientifc or technical sub- ject matter. Agencies have expertise in those areas; courts do not. Some demand a detailed understanding of complex and interdependent regulatory programs. Agencies know those programs inside-out; again, courts do not. And some present policy choices, including trade-offs between compet- ing goods. Agencies report to a President, who in turn an- swers to the public for his policy calls; courts have no such accountability and no proper basis for making policy. And of course Congress has conferred on that expert, experi- 450 LOPER BRIGHT ENTERPRISES v. RAIMONDO

enced, and politically accountable agency the authority to ad- minister—to make rules about and otherwise implement— the statute giving rise to the ambiguity or gap. Put all that together and deference to the agency is the almost obvious choice, based on an implicit congressional delegation of inter- pretive authority. We defer, the Court has explained, “be- cause of a presumption that Congress” would have “desired the agency (rather than the courts)” to exercise “whatever degree of discretion” the statute allows. Smiley v. Citibank (South Dakota), N. A., 517 U. S. 735, 740–741 (1996). Today, the Court fips the script: It is now “the courts (rather than the agency)” that will wield power when Con- gress has left an area of interpretive discretion. A rule of judicial humility gives way to a rule of judicial hubris. In recent years, this Court has too often taken for itself decision-making authority Congress assigned to agencies. The Court has substituted its own judgment on workplace health for that of the Occupational Safety and Health Admin- istration; its own judgment on climate change for that of the Environmental Protection Agency; and its own judgment on student loans for that of the Department of Education. See, e. g., National Federation of Independent Business v. OSHA, 595 U. S. 109 (2022); West Virginia v. EPA, 597 U. S. 697 (2022); Biden v. Nebraska, 600 U. S. 477 (2023). But evi- dently that was, for this Court, all too piecemeal. In one fell swoop, the majority today gives itself exclusive power over every open issue—no matter how expertise-driven or policy-laden—involving the meaning of regulatory law. As if it did not have enough on its plate, the majority turns itself into the country's administrative czar. It defends that move as one (suddenly) required by the (nearly 80-year-old) Ad- ministrative Procedure Act. But the Act makes no such de- mand. Today's decision is not one Congress directed. It is entirely the majority's choice. And the majority cannot destroy one doctrine of judicial humility without making a laughing-stock of a second. (If Cite as: 603 U. S. 369 (2024) 451

opinions had titles, a good candidate for today's would be Hubris Squared.) Stare decisis is, among other things, a way to remind judges that wisdom often lies in what prior judges have done. It is a brake on the urge to convert “every new judge's opinion” into a new legal rule or regime. Dobbs v. Jackson Women's Health Organization, 597 U. S. 215, 388 (2022) ( joint opinion of Breyer, Sotomayor, and Kagan, JJ., dissenting) (quoting 1 W. Blackstone, Commen- taries on the Laws of England 69 (7th ed. 1775)). Chevron is entrenched precedent, entitled to the protection of stare decisis, as even the majority acknowledges. In fact, Chev- ron is entitled to the supercharged version of that doctrine because Congress could always overrule the decision, and because so many governmental and private actors have re- lied on it for so long. Because that is so, the majority needs a “particularly special justifcation” for its action. Kisor v. Wilkie, 588 U. S. 558, 588 (2019) (opinion of the Court). But the majority has nothing that would qualify. It barely tries to advance the usual factors this Court invokes for overrul- ing precedent. Its justifcation comes down, in the end, to this: Courts must have more say over regulation—over the provision of health care, the protection of the environment, the safety of consumer products, the effcacy of transporta- tion systems, and so on. A longstanding precedent at the crux of administrative governance thus falls victim to a bald assertion of judicial authority. The majority disdains re- straint, and grasps for power.

I Begin with the problem that gave rise to Chevron (and also to its older precursors): The regulatory statutes Con- gress passes often contain ambiguities and gaps. Some- times they are intentional. Perhaps Congress “consciously desired” the administering agency to fll in aspects of the legislative scheme, believing that regulatory experts would be “in a better position” than legislators to do so. Chevron, 452 LOPER BRIGHT ENTERPRISES v. RAIMONDO

467 U. S., at 865. Or “perhaps Congress was unable to forge a coalition on either side” of a question, and the contending parties “decided to take their chances with” the agency's res- olution. Ibid. Sometimes, though, the gaps or ambiguities are what might be thought of as predictable accidents. They may be the result of sloppy drafting, a not infrequent legislative occurrence. Or they may arise from the well- known limits of language or foresight. Accord, ante, at 385, 399–400. “The subject matter” of a statutory provision may be too “specialized and varying” to “capture in its every de- tail.” Kisor, 588 U. S., at 566 (plurality opinion). Or the pro- vision may give rise, years or decades down the road, to an issue the enacting Congress could not have anticipated. Whichever the case—whatever the reason—the result is to create uncertainty about some aspect of a provision's meaning. Consider a few examples from the caselaw. They will help show what a typical Chevron question looks like—or really, what a typical Chevron question is. Because when choosing whether to send some class of questions mainly to a court, or mainly to an agency, abstract analysis can only go so far; indeed, it may obscure what matters most. So I begin with the concrete: • Under the Public Health Service Act, the Food and Drug Administration (FDA) regulates “biological prod- uct[s],” including “protein[s].” 42 U. S. C. § 262(i)(1). When does an alpha amino acid polymer qualify as such a “protein”? Must it have a specifc, defned sequence of amino acids? See Teva Pharmaceuticals USA, Inc. v. FDA, 514 F. Supp. 3d 66, 79–80, 93–106 (DC 2020). • Under the Endangered Species Act, the Fish and Wild- life Service must designate endangered “vertebrate fsh or wildlife” species, including “distinct population seg- ment[s]” of those species. 16 U. S. C. § 1532(16); see § 1533. What makes one population segment “distinct” from another? Must the Service treat the Washington State population of western gray squirrels as “distinct” Cite as: 603 U. S. 369 (2024) 453

because it is geographically separated from other west- ern gray squirrels? Or can the Service take into ac- count that the genetic makeup of the Washington popu- lation does not differ markedly from the rest? See Northwest Ecosystem Alliance v. United States Fish and Wildlife Serv., 475 F. 3d 1136, 1140–1145, 1149 (CA9 2007). • Under the Medicare program, reimbursements to hos- pitals are adjusted to refect “differences in hospital wage levels” across “geographic area[s].” 42 U. S. C. § 1395ww(d)(3)(E)(i). How should the Department of Health and Human Services measure a “geographic area”? By city? By county? By metropolitan area? See Bellevue Hospital Center v. Leavitt, 443 F. 3d 163, 174–176 (CA2 2006). • Congress directed the Department of the Interior and the Federal Aviation Administration to reduce noise from aircraft fying over Grand Canyon National Park— specifcally, to “provide for substantial restoration of the natural quiet.” § 3(b)(1), 101 Stat. 676; see § 3(b)(2). How much noise is consistent with “the natural quiet”? And how much of the park, for how many hours a day, must be that quiet for the “substantial restoration” re- quirement to be met? See Grand Canyon Air Tour Co- alition v. FAA, 154 F. 3d 455, 466–467, 474–475 (CADC 1998). • Or take Chevron itself. In amendments to the Clean Air Act, Congress told States to require permits for modifying or constructing “stationary sources” of air pol- lution. 42 U. S. C. § 7502(c)(5). Does the term “station- ary source[ ]” refer to each pollution-emitting piece of equipment within a plant? Or does it refer to the entire plant, and thus allow escape from the permitting re- quirement when increased emissions from one piece of equipment are offset by reductions from another? See 467 U. S., at 857, 859. 454 LOPER BRIGHT ENTERPRISES v. RAIMONDO

In each case, a statutory phrase has more than one reason- able reading. And Congress has not chosen among them: It has not, in any real-world sense, “fxed” the “single, best meaning” at “the time of enactment” (to use the majority's phrase). Ante, at 400. A question thus arises: Who decides which of the possible readings should govern? This Court has long thought that the choice should usually fall to agencies, with courts broadly deferring to their judg- ments. For the last 40 years, that doctrine has gone by the name of Chevron deference, after the 1984 decision that for- malized and canonized it. In Chevron, the Court set out a simple two-part framework for reviewing an agency's inter- pretation of a statute that it administers. First, the review- ing court must determine whether Congress has “directly spoken to the precise question at issue.” 467 U. S., at 842. That inquiry is rigorous: A court must exhaust all the “tradi- tional tools of statutory construction” to divine statutory meaning. Id., at 843, n. 9. And when it can fnd that mean- ing—a “single right answer”—that is “the end of the mat- ter”: The court cannot defer because it “must give effect to the unambiguously expressed intent of Congress.” Kisor, 588 U. S., at 575 (opinion of the Court); Chevron, 467 U. S., at 842–843. But if the court, after using its whole legal toolkit, concludes that “the statute is silent or ambiguous with respect to the specifc issue” in dispute—for any of the not-uncommon reasons discussed above—then the court must cede the pri- mary interpretive role. Ibid.; see supra, at 451–452. At that second step, the court asks only whether the agency construction is within the sphere of “reasonable” readings. Chevron, 467 U. S., at 844. If it is, the agency's interpreta- tion of the statute that it every day implements will control. That rule, the Court has long explained, rests on a pre- sumption about legislative intent—about what Congress wants when a statute it has charged an agency with imple- menting contains an ambiguity or a gap. See id., at 843– 845; Smiley, 517 U. S., at 740–741. An enacting Congress, Cite as: 603 U. S. 369 (2024) 455

as noted above, knows those uncertainties will arise, even if it does not know what they will turn out to be. See supra, at 451–452. And every once in a while, Congress provides an explicit instruction for dealing with that contingency— assigning primary responsibility to the courts, or else to an agency. But much more often, Congress does not say. Thus arises the need for a presumption—really, a default rule—for what should happen in that event. Does a statu- tory silence or ambiguity then go to a court for resolution? Or to an agency? This Court has long thought Congress would choose an agency, with courts serving only as a back- stop to make sure the agency makes a reasonable choice among the possible readings. Or said otherwise, Congress would select the agency it has put in control of a regulatory scheme to exercise the “degree of discretion” that the stat- ute's lack of clarity or completeness allows. Smiley, 517 U. S., at 741. Of course, Congress can always refute that presump- tive choice—can say that, really, it would prefer courts to wield that discretionary power. But until then, the presump- tion cuts in the agency's favor.1 The next question is why.

1 Note that presumptions of this kind are common in the law. In other contexts, too, the Court responds to a congressional lack of direction by adopting a presumption about what Congress wants, rather than trying to fgure that out in every case. And then Congress can legislate, with “predictable effects,” against that “stable background” rule. Morrison v. National Australia Bank Ltd., 561 U. S. 247, 261 (2010). Take the pre- sumption against extraterritoriality: The Court assumes Congress means for its statutes to apply only within the United States, absent a “clear indication” to the contrary. Id., at 255. Or the presumption against ret- roactivity: The Court assumes Congress wants its laws to apply only prospectively, unless it “unambiguously instruct[s]” something different. Vartelas v. Holder, 566 U. S. 257, 266 (2012). Or the presumption against repeal of statutes by implication: The Court assumes Congress does not intend a later statute to displace an earlier one unless it makes that inten- tion “clear and manifest.” Epic Systems Corp. v. Lewis, 584 U. S. 497, 510 (2018). Or the (so far unnamed) presumption against treating a proce- dural requirement as “jurisdictional” unless “Congress clearly states that it is.” Boechler v. Commissioner, 596 U. S. 199, 203 (2022). I could con- 456 LOPER BRIGHT ENTERPRISES v. RAIMONDO

For one, because agencies often know things about a stat- ute's subject matter that courts could not hope to. The point is especially stark when the statute is of a “scientifc or technical nature.” Kisor, 588 U. S., at 571 (plurality opin- ion). Agencies are staffed with “experts in the feld” who can bring their training and knowledge to bear on open stat- utory questions. Chevron, 467 U. S., at 865. Consider, for example, the frst bulleted case above. When does an alpha amino acid polymer qualify as a “protein”? See supra, at 452. I don't know many judges who would feel confdent resolving that issue. (First question: What even is an alpha amino acid polymer?) But the FDA likely has scores of sci- entists on staff who can think intelligently about it, maybe collaborate with each other on its fner points, and arrive at a sensible answer. Or take the perhaps more accessible- sounding second case, involving the Endangered Species Act. See supra, at 452–453. Deciding when one squirrel popula- tion is “distinct” from another (and thus warrants protection) requires knowing about species more than it does consulting a dictionary. How much variation of what kind—geographic, genetic, morphological, or behavioral—should be required? A court could, if forced to, muddle through that issue and an- nounce a result. But wouldn't the Fish and Wildlife Service, with all its specialized expertise, do a better job of the task— of saying what, in the context of species protection, the open- ended term “distinct” means? One idea behind the Chevron presumption is that Congress—the same Congress that charged the Service with implementing the Act—would an- swer that question with a resounding “yes.”

tinue, except that this footnote is long enough. The Chevron deference rule is to the same effect: The Court generally assumes that Congress intends to confer discretion on agencies to handle statutory ambiguities or gaps, absent a direction to the contrary. The majority calls that presump- tion a “fction,” ante, at 404, but it is no more so than any of the presump- tions listed above. They all are best guesses—and usually quite good guesses—by courts about congressional intent. Cite as: 603 U. S. 369 (2024) 457

A second idea is that Congress would value the agency's experience with how a complex regulatory regime functions, and with what is needed to make it effective. Let's stick with squirrels for a moment, except broaden the lens. In construing a term like “distinct” in a case about squirrels, the Service likely would beneft from its “historical familiar- ity” with how the term has covered the population segments of other species. Martin v. Occupational Safety and Health Review Comm'n, 499 U. S. 144, 153 (1991); see, e. g., Center for Biological Diversity v. Zinke, 900 F. 3d 1053, 1060–1062 (CA9 2018) (arctic grayling); Center for Biological Diversity v. Zinke, 868 F. 3d 1054, 1056 (CA9 2017) (desert eagle). Just as a common-law court makes better decisions as it sees multiple variations on a theme, an agency's construction of a statutory term benefts from its unique exposure to all the related ways the term comes into play. Or consider, for an- other way regulatory familiarity matters, the example about adjusting Medicare reimbursement for geographic wage dif- ferences. See supra, at 453. According to a dictionary, the term “geographic area” could be as large as a multi-state region or as small as a census tract. How to choose? It would make sense to gather hard information about what reimbursement levels each approach will produce, to explore the ease of administering each on a nationwide basis, to sur- vey how regulators have dealt with similar questions in the past, and to confer with the hospitals themselves about what makes sense. See Kisor, 588 U. S., at 571 (plurality opinion) (noting that agencies are able to “conduct factual investiga- tions” and “consult with affected parties”). Congress knows the Department of Health and Human Services can do all those things—and that courts cannot. Still more, Chevron's presumption refects that resolving statutory ambiguities, as Congress well knows, is “often more a question of policy than of law.” Pauley v. BethEn- ergy Mines, Inc., 501 U. S. 680, 696 (1991). The task is less one of construing a text than of balancing competing goals 458 LOPER BRIGHT ENTERPRISES v. RAIMONDO

and values. Consider the statutory directive to achieve “substantial restoration of the [Grand Canyon's] natural quiet.” See supra, at 453. Someone is going to have to de- cide exactly what that statute means for air traffc over the canyon. How many fights, in what places and at what times, are consistent with restoring enough natural quiet on the ground? That is a policy trade-off of a kind familiar to agencies—but peculiarly unsuited to judges. Or consider Chevron itself. As the Court there understood, the choice between defning a “stationary source” as a whole plant or as a pollution-emitting device is a choice about how to “rec- oncile” two “manifestly competing interests.” 467 U. S., at 865. The plantwide defnition relaxes the permitting re- quirement in the interest of promoting economic growth; the device-specifc defnition strengthens that requirement to better reduce air pollution. See id., at 851, 863, 866. Again, that is a choice a judge should not be making, but one an agency properly can. Agencies are “subject to the supervision of the President, who in turn answers to the pub- lic.” Kisor, 588 U. S., at 571–572 (plurality opinion). So when faced with a statutory ambiguity, “an agency to which Congress has delegated policymaking responsibilities” may rely on an accountable actor's “views of wise policy to inform its judgments.” Chevron, 467 U. S., at 865. None of this is to say that deference to agencies is always appropriate. The Court over time has fne-tuned the Chev- ron regime to deny deference in classes of cases in which Congress has no reason to prefer an agency to a court. The majority treats those “refnements” as a faw in the scheme, ante, at 404, but they are anything but. Consider the rule that an agency gets no deference when construing a statute it is not responsible for administering. See Epic Systems Corp. v. Lewis, 584 U. S. 497, 519–520 (2018). Well, of course not—if Congress has not put an agency in charge of im- plementing a statute, Congress would not have given the agency a special role in its construction. Or take the rule Cite as: 603 U. S. 369 (2024) 459

that an agency will not receive deference if it has reached its decision without using—or without using properly—its rulemaking or adjudicatory authority. See United States v. Mead Corp., 533 U. S. 218, 226–227 (2001); Encino Motorcars, LLC v. Navarro, 579 U. S. 211, 220 (2016). Again, that should not be surprising: Congress expects that authorita- tive pronouncements on a law's meaning will come from the procedures it has enacted to foster “fairness and delibera- tion” in agency decision-making. Mead, 533 U. S., at 230. Or fnally, think of the “extraordinary cases” involving ques- tions of vast “economic and political signifcance” in which the Court has declined to defer. King v. Burwell, 576 U. S. 473, 485–486 (2015). The theory is that Congress would not have left matters of such import to an agency, but would instead have insisted on maintaining control. So the Chev- ron refnements proceed from the same place as the original doctrine. Taken together, they give interpretive primacy to the agency when—but only when—it is acting, as Congress specifed, in the heartland of its delegated authority. That carefully calibrated framework “refects a sensitivity to the proper roles of the political and judicial branches.” Pauley, 501 U. S., at 696. Where Congress has spoken, Con- gress has spoken; only its judgments matter. And courts alone determine when that has happened: Using all their normal interpretive tools, they decide whether Congress has addressed a given issue. But when courts have decided that Congress has not done so, a choice arises. Absent a legisla- tive directive, either the administering agency or a court must take the lead. And the matter is more ft for the agency. The decision is likely to involve the agency's subject-matter expertise; to fall within its sphere of regula- tory experience; and to involve policy choices, including cost- beneft assessments and trade-offs between conficting val- ues. So a court without relevant expertise or experience, and without warrant to make policy calls, appropriately steps back. The court still has a role to play: It polices the 460 LOPER BRIGHT ENTERPRISES v. RAIMONDO

agency to ensure that it acts within the zone of reasonable options. But the court does not insert itself into an agency's expertise-driven, policy-laden functions. That is the ar- rangement best suited to keep every actor in its proper lane. And it is the one best suited to ensure that Congress's stat- utes work in the way Congress intended. The majority makes two points in reply, neither convinc- ing. First, it insists that “agencies have no special compe- tence” in flling gaps or resolving ambiguities in regulatory statutes; rather, “[c]ourts do.” Ante, at 400–401. Score one for self-confdence; maybe not so high for self-refection or -knowledge. Of course courts often construe legal texts, hopefully well. And Chevron's frst step takes full advan- tage of that talent: There, a court tries to divine what Con- gress meant, even in the most complicated or abstruse statu- tory schemes. The deference comes in only if the court cannot do so—if the court must admit that standard legal tools will not avail to fll a statutory silence or give content to an ambiguous term. That is when the issues look like the ones I started off with: When does an alpha amino acid poly- mer qualify as a “protein”? How distinct is “distinct” for squirrel populations? What size “geographic area” will ensure appropriate hospital reimbursement? As between two equally feasible understandings of “stationary source,” should one choose the one more protective of the environ- ment or the one more favorable to economic growth? The idea that courts have “special competence” in deciding such questions whereas agencies have “no[ne]” is, if I may say, malarkey. Answering those questions right does not mainly demand the interpretive skills courts possess. Instead, it de- mands one or more of: subject-matter expertise, long engage- ment with a regulatory scheme, and policy choice. It is courts (not agencies) that “have no special competence”—or even legitimacy—when those are the things a decision calls for. Second, the majority complains that an ambiguity or gap does not “necessarily refect a congressional intent that an Cite as: 603 U. S. 369 (2024) 461

agency” should have primary interpretive authority. Ante, at 399. On that score, I'll agree with the premise: It doesn't “necessarily” do so. Chevron is built on a presumption. The decision does not maintain that Congress in every case wants the agency, rather than a court, to fll in gaps. The decision maintains that when Congress does not expressly pick one or the other, we need a default rule; and the best default rule—agency or court?—is the one we think Con- gress would generally want. As to why Congress would generally want the agency: The answer lies in everything said above about Congress's delegation of regulatory power to the agency and the agency's special competencies. See supra, at 456–458. The majority appears to think it is a showstopping rejoinder to note that many statutory gaps and ambiguities are “unintentional.” Ante, at 400. But to begin, many are not; the ratio between the two is uncertain. See supra, at 451–452. And to end, why should that matter in any event? Congress may not have deliberately intro- duced a gap or ambiguity into the statute; but it knows that pretty much everything it drafts will someday be found to contain such a “faw.” Given that knowledge, Chevron asks, what would Congress want? The presumed answer is again the same (for the same reasons): The agency. And as with any default rule, if Congress decides otherwise, all it need do is say. In that respect, the proof really is in the pudding: Con- gress basically never says otherwise, suggesting that Chev- ron chose the presumption aligning with legislative intent (or, in the majority's words, “approximat[ing] reality,” ante, at 399). Over the last four decades, Congress has authorized or reauthorized hundreds of statutes. The drafters of those statutes knew all about Chevron. See A. Gluck & L. Bress- man, Statutory Interpretation From the Inside—An Empiri- cal Study of Congressional Drafting, Delegation, and the Canons: Part I, 65 Stan. L. Rev. 901, 928 (fg. 2), 994 (2013). So if they had wanted a different assignment of interpretive 462 LOPER BRIGHT ENTERPRISES v. RAIMONDO

responsibility, they would have inserted a provision to that effect. With just a pair of exceptions I know of, they did not. See 12 U. S. C. § 25b(b)(5)(A) (exception #1); 15 U. S. C. § 8302(c)(3)(A) (exception #2). Similarly, Congress has de- clined to enact proposed legislation that would abolish Chev- ron across the board. See S. 909, 116th Cong., 1st Sess., § 2 (2019) (still a bill, not a law); H. R. 5, 115th Cong., 1st Sess., § 202 (2017) (same). So to the extent the majority is worried that the Chevron presumption is “fction[al],” ante, at 404—as all legal presumptions in some sense are—it has gotten less and less so every day for 40 years. The congressional reac- tion shows as well as anything could that the Chevron Court read Congress right. II The majority's principal arguments are in a different vein. Around 80 years after the APA was enacted and 40 years after Chevron, the majority has decided that the former pre- cludes the latter. The APA's Section 706, the majority says, “makes clear” that agency interpretations of statutes “are not entitled to deference.” Ante, at 392 (emphasis in origi- nal). And that provision, the majority continues, codifed the contemporaneous law, which likewise did not allow for deference. See ante, at 387–390, 393–394. But neither the APA nor the pre-APA state of the law does the work that the majority claims. Both are perfectly compatible with Chevron deference. Section 706, enacted with the rest of the APA in 1946, provides for judicial review of agency action. It states: “To the extent necessary to decision and when presented, the reviewing court shall decide all relevant questions of law, interpret constitutional and statutory provisions, and deter- mine the meaning or applicability of the terms of an agency action.” 5 U. S. C. § 706. That text, contra the majority, “does not resolve the Chev- ron question.” C. Sunstein, Chevron As Law, 107 Geo. L. J. Cite as: 603 U. S. 369 (2024) 463

1613, 1642 (2019) (Sunstein). Or said a bit differently, Sec- tion 706 is “generally indeterminate” on the matter of defer- ence. A. Vermeule, Judging Under Uncertainty 207 (2006) (Vermeule). The majority highlights the phrase “decide all relevant questions of law” (italicizing the “all”), and notes that the provision “prescribes no deferential standard” for answering those questions. Ante, at 392. But just as the provision does not prescribe a deferential standard of review, so too it does not prescribe a de novo standard of review (in which the court starts from scratch, without giving defer- ence). In point of fact, Section 706 does not specify any standard of review for construing statutes. See Kisor, 588 U. S., at 581 (plurality opinion). And when a court uses a deferential standard—here, by deciding whether an agency reading is reasonable—it just as much “decide[s]” a “relevant question[ ] of law” as when it uses a de novo standard. § 706. The deferring court then conforms to Section 706 “by deter- mining whether the agency has stayed within the bounds of its assigned discretion—that is, whether the agency has construed [the statute it administers] reasonably.” J. Man- ning, Chevron and the Reasonable Legislator, 128 Harv. L. Rev. 457, 459 (2014); see Arlington v. FCC, 569 U. S. 290, 317 (2013) (Roberts, C. J., dissenting) (“We do not ignore [Section 706's] command when we afford an agency's statu- tory interpretation Chevron deference; we respect it”).2

2 The majority tries to buttress its argument with a stray sentence or two from the APA's legislative history, but the same response holds. As the majority notes, see ante, at 393, the House and Senate Reports each stated that Section 706 “provid[ed] that questions of law are for courts rather than agencies to decide in the last analysis.” H. R. Rep. No. 1980, 79th Cong., 2d Sess., 44 (1946); S. Rep. No. 752, 79th Cong., 1st Sess., 28 (1945). But that statement also does not address the standard of review that courts should then use. When a court defers under Chevron, it re- views the agency's construction for reasonableness “in the last analysis.” The views of Representative Walter, which the majority also cites, further demonstrate my point. He stated that the APA would require courts to 464 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Section 706's references to standards of review in other contexts only further undercut the majority's argument. The majority notes that Section 706 requires deferential re- view for agency fact-fnding and policy-making (under, re- spectively, a substantial-evidence standard and an arbitrary- and-capricious standard). See ante, at 392. Congress, the majority claims, “surely would have articulated a similarly deferential standard applicable to questions of law had it in- tended to depart” from de novo review. Ibid. Surely? In another part of Section 706, Congress explicitly referred to de novo review. § 706(2)(F). With all those references to standards of review—both deferential and not—running around Section 706, what is “telling” (ante, at 392) is the absence of any standard for reviewing an agency's statutory constructions. That silence left the matter, as noted above, “generally indeterminate”: Section 706 neither mandates nor forbids Chevron-style deference. Vermeule 207.3 And contra the majority, most “respected commentators” understood Section 706 in that way—as allowing, even if not requiring, deference. Ante, at 393. The fnest administra- tive law scholars of the time (call them that generation's Manning, Sunstein, and Vermeule) certainly did. Professor

“determine independently all relevant questions of law,” but he also stated that courts would be required to “exercise . . . independent judgment” in applying the substantial-evidence standard (a deferential standard if ever there were one). 92 Cong. Rec. 5654 (1946). He therefore did not equate “independent” review with de novo review; he thought that a court could conduct independent review of agency action using a deferential standard. 3 In a footnote responding to the last two paragraphs, the majority raises the white fag on Section 706's text. See ante, at 392–393, n. 4. Yes, it fnally concedes, Section 706 does not say that de novo review is required for an agency's statutory construction. Rather, the majority says, “some things go without saying,” and de novo review is such a thing. See ibid. But why? What extra-textual considerations force us to read Section 706 the majority's way? In its footnote, the majority repairs only to history. But as I will explain below, the majority also gets wrong the most relevant history, pertaining to how judicial review of agency interpretations oper- ated in the years before the APA was enacted. See infra, at 466–470. Cite as: 603 U. S. 369 (2024) 465

Louis Jaffe described something very like the Chevron two- step as the preferred method of reviewing agency interpre- tations under the APA. A court, he said, frst “must decide as a `question of law' whether there is `discretion' in the premises.” Judicial Control of Administrative Action 570 (1965). That is akin to step 1: Did Congress speak to the issue, or did it leave openness? And if the latter, Jaffe con- tinued, the agency's view “if `reasonable' is free of control.” Ibid. That of course looks like step 2: defer if reasonable. And just in case that description was too complicated, Jaffe conveyed his main point this way: The argument that courts “must decide all questions of law”—as if there were no agency in the picture—“is, in my opinion, unsound.” Id., at 569. Similarly, Professor Kenneth Culp Davis, author of the then-preeminent treatise on administrative law, noted with approval that “reasonableness” review of agency interpreta- tions—in which courts “refused to substitute judgment”— had “survived the APA.” Administrative Law 880, 883, 885 (1951) (Davis). Other contemporaneous scholars and ex- perts agreed. See R. Levin, The APA and the Assault on Deference, 106 Minn. L. Rev. 125, 181–183 (2021) (Levin) (listing many of them). They did not see in their own time what the majority fnds there today.4 Nor, evidently, did the Supreme Court. In the years after the APA was enacted, the Court “never indicated that sec- tion 706 rejected the idea that courts might defer to agency

4 I concede one exception (whose view was “almost completely isolated,” Levin 181), but his comments on Section 706 refute a different aspect of the majority's argument. Professor John Dickinson, as the majority notes, thought that Section 706 precluded courts from deferring to agency interpretations. See Administrative Procedure Act: Scope and Grounds of Broadened Judicial Review, 33 A. B. A. J. 434, 516 (1947) (Dickinson); ante, at 393–394. But unlike the majority, he viewed that bar as “a change” to, not a restatement of, pre-APA law. Compare Dickinson 516 with ante, at 393–394. So if the majority really wants to rely on Profes- sor Dickinson, it will have to give up the claim, which I address below, that the law before the APA forbade deference. See infra, at 466–470. 466 LOPER BRIGHT ENTERPRISES v. RAIMONDO

interpretations of law.” Sunstein 1654. Indeed, not a sin- gle Justice so much as foated that view of the APA. To the contrary, the Court issued a number of decisions in those years deferring to an agency's statutory interpretation. See, e. g., Unemployment Compensation Comm'n of Alaska v. Aragon, 329 U. S. 143, 153–154 (1946); NLRB v. E. C. At- kins & Co., 331 U. S. 398, 403 (1947); Cardillo v. Liberty Mut. Ins. Co., 330 U. S. 469, 478–479 (1947). And that continued right up until Chevron. See, e. g., Mitchell v. Budd, 350 U. S. 473, 480 (1956); Zenith Radio Corp. v. United States, 437 U. S. 443, 450 (1978). To be clear: Deference in those years was not always given to interpretations that would receive it under Chevron. The practice then was more in- consistent and less fully elaborated than it later became. The point here is only that the Court came nowhere close to accepting the majority's view of the APA. Take the lan- guage from Section 706 that the majority most relies on: “de- cide all relevant questions of law.” See ante, at 391. In the decade after the APA's enactment, those words were used only four times in Supreme Court opinions (all in foot- notes)—and never to suggest that courts could not defer to agency interpretations. See Sunstein 1656. The majority's view of Section 706 likewise gets no sup- port from how judicial review operated in the years leading up to the APA. That prior history matters: As the majority recognizes, Section 706 was generally understood to “re- state[ ] the present law as to the scope of judicial review.” Dept. of Justice, Attorney General's Manual on the Adminis- trative Procedure Act 108 (1947); ante, at 393. The problem for the majority is that in the years preceding the APA, courts became ever more deferential to agencies. New Deal administrative programs had by that point come into their own. And this Court and others, in a fairly short time, had abandoned their initial resistance and gotten on board. Justice Breyer, wearing his administrative-law-scholar hat, characterized the pre-APA period this way: “[J]udicial re- Cite as: 603 U. S. 369 (2024) 467

view of administrative action was curtailed, and particular agency decisions were frequently sustained with judicial obeisance to the mysteries of administrative expertise.” S. Breyer et al., Administrative Law and Regulatory Policy 21 (7th ed. 2011). And that description extends to review of an agency's statutory constructions. An infuential study of administrative practice, published fve years before the APA's enactment, described the state of play: Judicial “re- view may, in some instances at least, be limited to the in- quiry whether the administrative construction is a permissi- ble one.” Final Report of Attorney General's Committee on Administrative Procedure (1941), reprinted in Administra- tive Procedure in Government Agencies, S. Doc. No. 8, 77th Cong., 1st Sess., 78 (1941). Or again: “[W]here the statute is reasonably susceptible of more than one interpretation, the court may accept that of the administrative body.” Id., at 90–91.5 Page 5 Proof Pending Publication Because the APA was meant to “restate[ ] the present law,” the judicial review practices of the 1940s are more important to understanding the statute than is any earlier tradition (such as the majority dwells on). But before I expand on those APA-contemporaneous practices, I pause to note that they were “not built on sand.” Kisor v. Wilkie, 588 U. S. 558, 568– 569 (2019) (plurality opinion). Since the early days of the Republic, this Court has given signifcant weight to offcial interpretations of “ambiguous law[s].” Edwards' Lessee v. Darby, 12 Wheat. 206, 210 (1827). With the passage of time—and the growth of the administrative sphere—those “ju- dicial expressions of deference increased.” H. Monaghan, Marbury and the Administrative State, 83 Colum. L. Rev. 1, 15 (1983). By the early 20th century, the Court stated that it would afford “great weight” to an agency construction in the face of statutory “uncertainty or ambiguity.” National Lead Co. v. United States, 252 U. S. 140, 145 (1920); see Schell's Executors v. Fauché, 138 U. S. 562, 572 (1891) (“controlling” weight in “all cases of ambiguity”); United States v. Alabama Great Southern R. Co., 142 U. S. 615, 621 (1892) (“decisive” weight “in case of ambiguity”); Jacobs v. Prichard, 223 U. S. 200, 214 (1912) (referring to the “rule which gives strength” to offcial interpretations if “ambiguity exist[s]”). So even be- fore the New Deal, a strand of this Court's cases exemplifed deference to executive constructions of ambiguous statutes. And then, as I show in 468 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Two prominent Supreme Court decisions of the 1940s put those principles into action. Gray v. Powell, 314 U. S. 402 (1941), was then widely understood as “the leading case” on review of agency interpretations. Davis 882; see ibid. (not- ing that it “establish[ed] what is known as `the doctrine of Gray v. Powell' ”). There, the Court deferred to an agency construction of the term “producer” as used in a statutory exemption from price controls. Congress, the Court ex- plained, had committed the scope of the exemption to the agency because its “experience in [the] feld gave promise of a better informed, more equitable, adjustment of the con- ficting interests.” Gray, 314 U. S., at 412. Accordingly, the Court concluded that it was “not the province of a court” to “substitute its judgment” for the agency's. Ibid. Three years later, the Court decided NLRB v. Hearst Publications, Inc., 322 U. S. 111 (1944), another acknowledged “leading case.” Davis 882; see id., at 884. The Court again de- ferred, this time to an agency's construction of the term “em- ployee” in the National Labor Relations Act. The scope of that term, the Court explained, “belong[ed] to” the agency to answer based on its “[e]veryday experience in the admin- istration of the statute.” Hearst, 322 U. S., at 130. The Court therefore “limited” its review to whether the agency's reading had “warrant in the record and a reasonable basis in law.” Id., at 131.6 Recall here that even the majority ac-

the text, the New Deal arrived and deference surged—creating the “pres- ent law” that the APA “restated.” 6 The majority says that I have “pluck[ed] out” Gray and Hearst, im- pliedly from a vast number of not-so-helpful cases. Ante, at 390, n. 3. It would make as much sense to say that a judge “plucked out” Universal Camera Corp. v. NLRB, 340 U. S. 474 (1951), to discuss substantial- evidence review or “plucked out” Motor Vehicle Mfrs. Assn. of United States, Inc. v. State Farm Mut. Automobile Ins. Co., 463 U. S. 29 (1983), to discuss arbitrary-and-capricious review. Gray and Hearst, as noted above, were the leading cases about agency interpretations in the years before the APA's enactment. But just to gild the lily, here are a number of other Supreme Court decisions from the fve years prior to the APA's Cite as: 603 U. S. 369 (2024) 469

cepts that Section 706 was meant to “restate[ ] the present law” as to judicial review. See ante, at 393; supra, at 466– 467. Well then? It sure would seem that the provision allows a deference regime. The majority has no way around those two noteworthy decisions. It frst appears to distinguish between “pure legal question[s]” and the so-called mixed questions in Gray and Hearst, involving the application of a legal standard to a set of facts. Ante, at 389. If in drawing that distinction, the majority intends to confne its holding to the pure type of legal issue—thus enabling courts to defer when law and facts are entwined—I'd be glad. But I suspect the majority has no such intent, because that approach would preserve Chevron in a substantial part of its current domain. Cf. Wilkinson v. Garland, 601 U. S. 209, 230 (2024) (Alito, J., dissenting) (noting, in the immigration context, that the uni- verse of mixed questions swamps that of pure legal ones). It is frequently in the consideration of mixed questions that the scope of statutory terms is established and their meaning defned. See H. Monaghan, Marbury and the Administra- tive State, 83 Colum. L. Rev. 1, 29 (1983) (“Administrative application of law is administrative formulation of law when- ever it involves elaboration of the statutory norm”). How does a statutory interpreter decide, as in Hearst, what an “employee” is? In large part through cases asking whether the term covers people performing specifc jobs, like (in that case) “newsboys.” 322 U. S., at 120. Or consider one of the examples I offered above. How does an interpreter decide when one population segment of a species is “distinct” from another? Often by considering that requirement with re-

enactment that were of a piece: United States v. Pierce Auto Freight Lines, Inc., 327 U. S. 515, 536 (1946); ICC v. Parker, 326 U. S. 60, 65 (1945); Federal Security Administrator v. Quaker Oats Co., 318 U. S. 218, 227– 228 (1943). The real “pluck[ing]” offense is the majority's—for taking a stray sentence from Hearst (ante, at 390, n. 3) to suggest that both Hearst and Gray stand for the opposite of what they actually do. 470 LOPER BRIGHT ENTERPRISES v. RAIMONDO

spect to particular species, like western gray squirrels. So the distinction the majority offers makes no real-world (or even theoretical) sense. If the Hearst Court was deferring to an agency on whether the term “employee” covered news- boys, it was deferring to the agency on the scope and mean- ing of the term “employee.” The majority's next rejoinder—that “the Court was far from consistent” in deferring—falls equally fat. Ante, at 389. I am perfectly ready to acknowledge that in the pre- APA period, a deference regime had not yet taken complete hold. I'll go even further: Let's assume that deference was then an on-again, off-again function (as the majority seems to suggest, see ante, at 389–390, and n. 3). Even on that assumption, the majority's main argument—that Section 706 prohibited deferential review—collapses. Once again, the majority agrees that Section 706 was not meant to change the then-prevailing law. See ante, at 393. And even if in- consistent, that law cannot possibly be thought to have pro- hibited deference. Or otherwise said: “If Section 706 did not change the law of judicial review (as we have long rec- ognized), then it did not proscribe a deferential standard then known and in use.” Kisor, 588 U. S., at 583 (plurality opinion). The majority's whole argument for overturning Chevron relies on Section 706. But the text of Section 706 does not support that result. And neither does the contemporaneous practice, which that text was supposed to refect. So today's decision has no basis in the only law the majority deems rele- vant. It is grounded on air.

III And still there is worse, because abandoning Chevron sub- verts every known principle of stare decisis. Of course, re- specting precedent is not an “inexorable command.” Payne v. Tennessee, 501 U. S. 808, 828 (1991). But overthrowing it requires far more than the majority has offered up here. Cite as: 603 U. S. 369 (2024) 471

Chevron is entitled to stare decisis's strongest form of pro- tection. The majority thus needs an exceptionally strong reason to overturn the decision, above and beyond thinking it wrong. And it has nothing approaching such a justifca- tion, proposing only a bewildering theory about Chevron's “unworkability.” Ante, at 409. Just fve years ago, this Court in Kisor rejected a plea to overrule Auer v. Robbins, 519 U. S. 452 (1997), which requires judicial deference to agencies' interpretations of their own regulations. See 588 U. S., at 586–589 (opinion of the Court). The case against overruling Chevron is at least as strong. In particular, the majority's decision today will cause a massive shock to the legal system, “cast[ing] doubt on many settled constructions” of statutes and threatening the interests of many parties who have relied on them for years. 588 U. S., at 587 (opinion of the Court). Adherence to precedent is “a foundation stone of the rule of law.” Michigan v. Bay Mills Indian Community, 572 U. S. 782, 798 (2014). Stare decisis “promotes the even- handed, predictable, and consistent development of legal principles.” Payne, 501 U. S., at 827. It enables people to order their lives in reliance on judicial decisions. And it “contributes to the actual and perceived integrity of the judi- cial process,” by ensuring that those decisions are founded in the law, and not in the “personal preferences” of judges. Id., at 828; Dobbs, 597 U. S., at 388 (dissenting opinion). Perhaps above all else, stare decisis is a “doctrine of judicial modesty.” Id., at 363. In that, it shares something impor- tant with Chevron. Both tell judges that they do not know everything, and would do well to attend to the views of oth- ers. So today, the majority rejects what judicial humility counsels not just once but twice over. And Chevron is entitled to a particularly strong form of stare decisis, for two separate reasons. First, it matters that “Congress remains free to alter what we have done.” Patterson v. McLean Credit Union, 491 U. S. 164, 173 (1989); 472 LOPER BRIGHT ENTERPRISES v. RAIMONDO

see Kisor, 588 U. S., at 587 (opinion of the Court) (making the same point for Auer deference). In a constitutional case, the Court alone can correct an error. But that is not so here. “Our deference decisions are balls tossed into Con- gress's court, for acceptance or not as that branch elects.” 588 U. S., at 587–588 (opinion of the Court). And for genera- tions now, Congress has chosen acceptance. Throughout those years, Congress could have abolished Chevron across the board, most easily by amending the APA. Or it could have eliminated deferential review in discrete areas, by amending old laws or drafting new laws to include an anti- Chevron provision. Instead, Congress has “spurned multi- ple opportunities” to do a comprehensive rejection of Chev- ron, and has hardly ever done a targeted one. Kimble v. Marvel Entertainment, LLC, 576 U. S. 446, 456 (2015); see supra, at 461–462. Or to put the point more affrmatively, Congress has kept Chevron as is for 40 years. It maintained that position even as Members of this Court began to call Chevron into question. See ante, at 407. From all it ap- pears, Congress has not agreed with the view of some Jus- tices that they and other judges should have more power. Second, Chevron is by now much more than a single de- cision. This Court alone, acting as Chevron allows, has upheld an agency's reasonable interpretation of a statute at least 70 times. See Brief for United States in No. 22–1219, p. 27; App. to id., at 68a–72a (collecting cases). Lower courts have applied the Chevron framework on thousands upon thousands of occasions. See K. Barnett & C. Walker, Chevron and Stare Decisis, 31 Geo. Mason L. Rev. 475, 477, and n. 11 (2024) (noting that at last count, Chevron was cited in more than 18,000 federal-court decisions). The Kisor Court observed, when upholding Auer, that “[d]eference to reasonable agency interpretations of ambiguous rules per- vades the whole corpus of administrative law.” 588 U. S., at 587 (opinion of the Court). So too does deference to reason- able agency interpretations of ambiguous statutes—except Cite as: 603 U. S. 369 (2024) 473

more so. Chevron is as embedded as embedded gets in the law. The majority says differently, because this Court has ig- nored Chevron lately; all that is left of the decision is a “de- caying husk with bold pretensions.” Ante, at 410. Tell that to the D. C. Circuit, the court that reviews a large share of agency interpretations, where Chevron remains alive and well. See, e. g., Lissack v. Commissioner, 68 F. 4th 1312, 1321–1322 (2023); Solar Energy Industries Assn. v. FERC, 59 F. 4th 1287, 1291–1294 (2023). But more to the point: The majority's argument is a bootstrap. This Court has “avoided deferring under Chevron since 2016” (ante, at 410) because it has been preparing to overrule Chevron since around that time. That kind of self-help on the way to re- versing precedent has become almost routine at this Court. Stop applying a decision where one should; “throw some gra- tuitous criticisms into a couple of opinions”; issue a few sepa- rate writings “question[ing the decision's] premises” (ante, at 407); give the whole process a few years . . . and voila!—you have a justifcation for overruling the decision. Janus v. State, County, and Municipal Employees, 585 U. S. 878, 950 (2018) (Kagan, J., dissenting) (discussing the overruling of Abood v. Detroit Bd. of Ed., 431 U. S. 209 (1977)); see also, e. g., Kennedy v. Bremerton School Dist., 597 U. S. 507, 571– 572 (2022) (Sotomayor, J., dissenting) (similar for Lemon v. Kurtzman, 403 U. S. 602 (1971)); Shelby County v. Holder, 570 U. S. 529, 587–588 (2013) (Ginsburg, J., dissenting) (simi- lar for South Carolina v. Katzenbach, 383 U. S. 301 (1966)). I once remarked that this overruling-through-enfeeblement technique “mock[ed] stare decisis.” Janus, 585 U. S., at 950 (dissenting opinion). I have seen no reason to change my mind. The majority does no better in its main justifcation for overruling Chevron—that the decision is “unworkable.” Ante, at 407. The majority's frst theory on that score is that there is no single “answer” about what “ambiguity” means: 474 LOPER BRIGHT ENTERPRISES v. RAIMONDO

Some judges turn out to see more of it than others do, lead- ing to “different results.” Ante, at 408. But even if so, the legal system has for many years, in many contexts, dealt perfectly well with that variation. Take contract law. It is hornbook stuff that when (but only when) a contract is ambiguous, a court interpreting it can consult extrinsic evi- dence. See CNH Industrial N.V. v. Reese, 583 U. S. 133, 139 (2018) (per curiam). And when all interpretive tools still leave ambiguity, the contract is construed against the drafter. See Lamps Plus, Inc. v. Varela, 587 U. S. 176, 186– 187 (2019). So I guess the contract rules of the 50 States are unworkable now. Or look closer to home, to doctrines this Court regularly applies. In deciding whether a govern- ment has waived sovereign immunity, we construe “[a]ny am- biguities in the statutory language” in “favor of immunity.” FAA v. Cooper, 566 U. S. 284, 290 (2012). Similarly, the rule of lenity tells us to construe ambiguous statutes in favor of criminal defendants. See United States v. Castleman, 572 U. S. 157, 172–173 (2014). And the canon of constitutional avoidance instructs us to construe ambiguous laws to avoid diffcult constitutional questions. See United States v. Oak- land Cannabis Buyers' Cooperative, 532 U. S. 483, 494 (2001). I could go on, but the point is made. There are ambiguity triggers all over the law. Somehow everyone seems to get by. And Chevron is an especially puzzling decision to criticize on the ground of generating too much judicial divergence. There's good empirical—meaning, non-impressionistic—evi- dence on exactly that subject. And it shows that, as com- pared with de novo review, use of the Chevron two-step framework fosters agreement among judges. See K. Bar- nett, C. Boyd, & C. Walker, Administrative Law's Political Dynamics, 71 Vand. L. Rev. 1463, 1502 (2018) (Barnett). More particularly, Chevron has a “powerful constraining ef- fect on partisanship in judicial decisionmaking.” Barnett Cite as: 603 U. S. 369 (2024) 475

1463 (italics deleted); see Sunstein 1672 (“[A] predictable ef- fect of overruling Chevron would be to ensure a far greater role for judicial policy preferences in statutory interpreta- tion and far more common splits along ideological lines”). So if consistency among judges is the majority's lodestar, then the Court should not overrule Chevron, but return to using it. The majority's second theory on workability is likewise a makeweight. Chevron, the majority complains, has some exceptions, which (so the majority says) are “diffcult” and “complicate[d]” to apply. Ante, at 409. Recall that courts are not supposed to defer when the agency construing a stat- ute (1) has not been charged with administering that law; (2) has not used deliberative procedures—i. e., notice-and- comment rulemaking or adjudication; or (3) is intervening in a “major question,” of great economic and political signif- cance. See supra, at 458–459; ante, at 405. As I've ex- plained, those exceptions—the majority also aptly calls them “refnements”—ft with Chevron's rationale: They defne cir- cumstances in which Congress is unlikely to have wanted agency views to govern. Ante, at 404; see supra, at 458– 459. And on the diffculty scale, they are nothing much. Has Congress put the agency in charge of administering the statute? In 99 of 100 cases, everyone will agree on the an- swer with scarcely a moment's thought. Did the agency use notice-and-comment or an adjudication before rendering an interpretation? Once again, I could stretch my mind and think up a few edge cases, but for the most part, the answer is an easy yes or no. The major questions exception is, I acknowledge, different: There, many judges have indeed dis- puted its nature and scope. Compare, e. g., West Virginia, 597 U. S., at 721–724, with id., at 764–770 (Kagan, J., dissent- ing). But that disagreement concerns, on everyone's view, a tiny subset of all agency interpretations. For the most part, the exceptions that so upset the majority require 476 LOPER BRIGHT ENTERPRISES v. RAIMONDO

merely a rote, check-the-box inquiry. If that is the majori- ty's idea of a “dizzying breakdance,” ante, at 409, the major- ity needs to get out more. And anyway, diffcult as compared to what? The majori- ty's prescribed way of proceeding is no walk in the park. First, the majority makes clear that what is usually called Skidmore deference continues to apply. See ante, at 394. Under that decision, agency interpretations “constitute a body of experience and informed judgment” that may be “entitled to respect.” Skidmore v. Swift & Co., 323 U. S. 134, 140 (1944). If the majority thinks that the same judges who argue today about where “ambiguity” resides (see ante, at 408) are not going to argue tomorrow about what “re- spect” requires, I fear it will be gravely disappointed. Sec- ond, the majority directs courts to comply with the varied ways in which Congress in fact “delegates discretionary au- thority” to agencies. Ante, at 395–396. For example, Con- gress may authorize an agency to “defne[ ]” or “delimit[ ]” statutory terms or concepts, or to “fll up the details” of a statutory scheme. Ante, at 395, and n. 5. Or Congress may use, in describing an agency's regulatory authority, inher- ently “fexib[le]” language like “appropriate” or “reason- able.” Ibid., n. 6. Attending to every such delegation, as the majority says, is necessary in a world without Chev- ron. But that task involves complexities of its own. In- deed, one reason Justice Scalia supported Chevron was that it replaced such a “statute-by-statute evaluation (which was assuredly a font of uncertainty and litigation) with an across- the-board presumption.” A. Scalia, Judicial Deference to Administrative Interpretations of Law, 1989 Duke L. J. 511, 516. As a lover of the predictability that rules create, Jus- tice Scalia thought the latter “unquestionably better.” Id., at 517. On the other side of the balance, the most important stare decisis factor—call it the “jolt to the legal system” issue— weighs heavily against overruling Chevron. Dobbs, 597 Cite as: 603 U. S. 369 (2024) 477

U. S., at 357 (Roberts, C. J., concurring in judgment). Con- gress and agencies alike have relied on Chevron—have as- sumed its existence—in much of their work for the last 40 years. Statutes passed during that time refect the expecta- tion that Chevron would allocate interpretive authority be- tween agencies and courts. Rules issued during the period likewise presuppose that statutory ambiguities were the agencies' to (reasonably) resolve. Those agency interpreta- tions may have benefted regulated entities; or they may have protected members of the broader public. Either way, private parties have ordered their affairs—their business and fnancial decisions, their health-care decisions, their edu- cational decisions—around agency actions that are suddenly now subject to challenge. In Kisor, this Court refused to overrule Auer because doing so would “cast doubt on” many longstanding constructions of rules, and thereby upset set- tled expectations. 588 U. S., at 587 (opinion of the Court). Overruling Chevron, and thus raising new doubts about agency constructions of statutes, will be far more disruptive. The majority tries to alleviate concerns about a piece of that problem: It states that judicial decisions that have up- held agency action as reasonable under Chevron should not be overruled on that account alone. See ante, at 412. That is all to the good: There are thousands of such decisions, many settled for decades. See supra, at 472. But frst, rea- sonable reliance need not be predicated on a prior judicial decision. Some agency interpretations never challenged under Chevron now will be; expectations formed around those constructions thus could be upset, in a way the majori- ty's assurance does not touch. And anyway, how good is that assurance, really? The majority says that a decision's “[m]ere reliance on Chevron” is not enough to counter the force of stare decisis; a challenger will need an additional “special justifcation.” Ante, at 412. The majority is san- guine; I am not so much. Courts motivated to overrule an old Chevron-based decision can always come up with some- 478 LOPER BRIGHT ENTERPRISES v. RAIMONDO

thing to label a “special justifcation.” Maybe a court will say “the quality of [the precedent's] reasoning” was poor. Ante, at 407. Or maybe the court will discover something “unworkable” in the decision—like some exception that has to be applied. Ibid. All a court need do is look to today's opinion to see how it is done.

IV Judges are not experts in the feld, and are not part of either political branch of the Government.

—Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837, 865 (1984)

Those were the days, when we knew what we are not. When we knew that as between courts and agencies, Con- gress would usually think agencies the better choice to re- solve the ambiguities and fll the gaps in regulatory statutes. Because agencies are “experts in the feld.” And because they are part of a political branch, with a claim to making interstitial policy. And because Congress has charged them, not us, with administering the statutes containing the open questions. At its core, Chevron is about respecting that al- location of responsibility—the conferral of primary authority over regulatory matters to agencies, not courts. Today, the majority does not respect that judgment. It gives courts the power to make all manner of scientifc and technical judgments. It gives courts the power to make all manner of policy calls, including about how to weigh compet- ing goods and values. (See Chevron itself.) It puts courts at the apex of the administrative process as to every conceiv- able subject—because there are always gaps and ambiguities in regulatory statutes, and often of great import. What ac- tions can be taken to address climate change or other envi- ronmental challenges? What will the Nation's health-care system look like in the coming decades? Or the fnancial or Cite as: 603 U. S. 369 (2024) 479

transportation systems? What rules are going to constrain the development of A.I.? In every sphere of current or fu- ture federal regulation, expect courts from now on to play a commanding role. It is not a role Congress has given to them, in the APA or any other statute. It is a role this Court has now claimed for itself, as well as for other judges. And that claim requires disrespecting, too, this Court's precedent. There are no special reasons, of the kind usually invoked for overturning precedent, to eliminate Chevron def- erence. And given Chevron's pervasiveness, the decision to do so is likely to produce large-scale disruption. All that backs today's decision is the majority's belief that Chevron was wrong—that it gave agencies too much power and courts not enough. But shifting views about the worth of regula- tory actors and their work do not justify overhauling a cor- nerstone of administrative law. In that sense too, today's majority has lost sight of its proper role. And it is impossible to pretend that today's decision is a one-off, in either its treatment of agencies or its treatment of precedent. As to the frst, this very Term presents yet another example of the Court's resolve to roll back agency authority, despite congressional direction to the contrary. See SEC v. Jarkesy, 603 U. S. 109 (2024); see also supra, at 450. As to the second, just my own defenses of stare deci- sis—my own dissents to this Court's reversals of settled law—by now fll a small volume. See Dobbs, 597 U. S., at 363–364 ( joint opinion of Breyer, Sotomayor, and Kagan, JJ.); Edwards v. Vannoy, 593 U. S. 255, 296–297 (2021); Knick v. Township of Scott, 588 U. S. 180, 207–208 (2019); Janus, 585 U. S., at 931–932. Once again, with respect, I dissent. Reporter’s Note

The attached opinion has been revised to refect the usual publication and citation style of the United States Reports. The revised pagination makes available the offcial United States Reports citation in advance of publication. The syllabus has been prepared by the Reporter of Decisions for the convenience of the reader and constitutes no part of the opinion of the Court. A list of counsel who argued or fled briefs in this case, and who were members of the bar of this Court at the time this case was argued, has been inserted following the syllabus. Other revisions may include adjustments to formatting, captions, citation form, and any errant punctuation. The following additional edits were made:

p. 393, last line: “for” is inserted before “itself ” p. 434, line 12 from bottom: “of ” is inserted after “much”