Mr. Justice Powell
delivered the opinion of the Court.
This case and Commissioner v. “Americans United” Inc., post, p. 752, involve the application of the Anti-[727]*727Injunction Act, § 7421 (a) of the Internal Revenue Code of 1954 (the Code), 26 U. S. C. § 7421 (a),.to the ruling-letter* program of the Internal Revenue Service (the Service) for organizations claiming tax-exempt status under Code § 501 (c) (3), 26 U. S. C. § 501 (c) (3). The question presented' is whether, prior to the assessment and collection of any tax, a court may enjoin the Service from revoking a ruling letter declaring that petitioner qualifies for tax-exempt status and from_ withdrawing advance assurance to donors that contributions to petitioner will constitute charitable deductions under Code § 170 (c)(2), 26 U. S. C. § 170 (c)(2). We hold that it may not.
Section 501 (a) of the.Code exempts from federal income taxes organizations .described in § 501 (c)(3). The latter provision encompasses:
“Corporations, and any community chest, fund, or foundation, organized and operated exclusively for religious, charitable, scientific, testing for public safety, literary, or educational purposes, or for the prevention of cruelty to children or .animals, no part of the net earnings of which inures to the benefit of any private shareholder or individual; no substantial part of the activities of which is carrying ..on propaganda, or otherwise attempting, to influence legislation, and which does not participate in, or intervene in (including the publishing or distributing of statements), any political campaign on behalf of any candidate for public office.”
Section 501 (c) (3.) organizations are also exempt from federal social security (FICA) taxes by virtue of Code §3121 (b)(8)(B), 26 U. S. C. § 3121 (b)(8)(B), and from federal unemployment (FUTA) taxes by virtue of §3306 (c)(8), 26 U. S. C. §3306 (c)(8). Dona[728]*728tions to § 501 (c) (3) organizations are tax deductible Under 1170(c)(2).1
As a practical matter, an organization hoping to solicit tax-deductible contributions may not rely solely on technical compliance with the language of §§ 501 (c)(3) and. 170 (c)(2). The organization must also obtain a ruling letter from the Service, pursuant to Rev. Procs. 72-3 and 72-4, 1972-1 Cum. Bull. 698, 706, declaring that it qualifies under § 501 (c)(3). Receipt of such a ruling letter leads, in the ordinary case, to inclusion in [729]*729the Service’s periodically updated Publication No. 78, “Cumulative List of Organizations described in Section 170 (c) - of the Internal Revenue Code of 1954” (the Cumulative List). In essence, the Cumulative List is the Service’s official roster of tax-exempt organizations: “The listing of an organization in [the Cumulative List] signifies it has received a ruling or determination letter .. . stating that contributions by donors to the organization are deductible as provided in section 170 of the-Code.” Rev. Proc. 72-39, 1972-2 Cum. Bull. 818. An. organization’s inclusion in the Cumulative List assures potential donors in advance that contributions to the organization will qualify as charitable deductions under §170 (c)(2). The Service has announced that, with ■ narrowly limited exceptions, a donor may rely on the Cumulative List for so long as the beneficiaries .of his largesse maintain their listing, regardless of their actual tax status.2 For this reason, appearance on the Cumu-. lative List is a prerequisite to successful fund raising [730]*730for most charitable organizations. Many contributors simply will not make donations to an organization that does not appear on the Cumulative List.3
Because of the importance of inclusion in the Cumulative List, revocation of a §501 (c)(3) ruling letter and consequent removal from the Cumulative List is likely to result in serious damage to a charitable organization.4 Revocation not only threatens the flow of contributions, it also subjects the affected organization to FICA and FUTA- taxes and, assuming that the organization has taxable income and does not qualify as tax exempt under another subsection of § 501, to federal income taxes.5 Upon -the assessment and attempted collection of income taxes, the organization may litigate the legality of the Service’s action by petitioning the Tax Court to review a notice of deficiency. See Code §§ 6212 and 6213, 26 U. S. C. §§ 6212 and 6213. Or, following the collection of apy federal tax and the denial of a refund by the Service,. the organization may bring a [731]*731refund suit in a federal district court or in the Court of Claims. See Code § 7422, 26 U. S. C. § 7422; 28 U. S. C. §§ 1346 (a)(1) and 1491. Finally, a donor to the organization may bring a refund suit to challenge the denial of a charitable deduction under §170 (c)(2). Presumably such a “friendly donor” would be able to attack the legality of the Service’s revocation of an organization’s § 501 (c) (3) status. But these post-revocation avenues of review take substantial time, during which the organization is certain to lose contributions from those donors whose gifts are contingent on entitlement to charitable deductions under § 170 (c)(2). Accordingly,' any organization threatened with revocation of a § 501 (c) (3) ruling letter has a powerful incentive to bring a pre-enforcement suit to prevent the Service from taking action in the first instance.
The pressures operating on organizations facing revocation of §501 (c)(3) status to seek injunctive relief against the Service pending judicial review of the proposed action conflict directly with a congressional prohibition of such pre-enforcement tax suits. In force continuously' since its enactment in 1867, the Anti-Injunction Act, now Code § 7421 (a), provides in pertinent part that “no suit, for the purpose of restraining the assessment or collection of any tax shall be maintained in any court . .' . .”6 Because an injunction [732]*732preventing the Service, from withdrawing a. § 501 (c) (3) ruling letter would necessarily preclude the collection of FICA, FUTA., and possibly incomé taxes from the affected organization, as well as the denial of § 170 (c)(2) charitable deductions to donors to the organization, a suit seeking such relief falls squarely within the literal scope of the Act.7
[733]*733The clash between the language of the Anti-Injunction Act and the desire of § 501 (c) (3) organizations to block the Service from withdrawing a ruling letter has been resolved against the organizations in most cases. E. g., [734]*734Crenshaw County Private School Foundation v. Connally, 474 F. 2d 1185 (CA5 1973), pet. for cert. pending in No. 73-170; National Council on the Facts of Overpopulation v. Caplin, 224 F. Supp. 313 (DC 1963); Israelite House of David v. Holden, 14 F. 2d 701 (WD Mich. 1926).8 But see McGlotten v. Connally, 338 F. Supp. 448 (DC 1972) (three-judge court). Cf. Green v. Connally, 330 F. Supp. 1150 (DC), aff’d per curiam sub nom. Coit v. Green, 404 U. S. 997 (1971).
In the present case, the Court of Appeals for the Fourth Circuit followed the majority view. Bob Jones University v. Connally, 472 F. 2d 903, petition for rehearing denied, 476 F. 2d 259 (1973). In light of the contrary result reached by the Court, of Appeals for the District of Columbia Circuit in “Americans United” Inc. v. Walters, 155 U. S. App. D. C. 284, 477 F. 2d 1169 (1973), rev’d sub nom. Commissioner_ v. “Americans. United” Inc., post, p. 752, we granted Bob Jones University’s petition for certiorari. 414 U. S. 817 (1973).
II
Petitioner refers to itself as “the world’s most unusual university.’’ Founded in. 1927 and now located in Green-ville, South Carolina, the University , is devoted, to the teaching and propagation of its fundamentalist religious beliefs. All classes commence, and close with grayer, [735]*735and courses in religion are compulsory! Students and faculty are screened for adherence to certain religious precepts and may be expelled or dismissed for lack of allegiance to them. One of these beliefs is that God intended segregation of the races and that the Scriptures forbid interracial marriage. Accordingly, petitioner refuses to admit Negroes as students. On pain of expulsion students are prohibited from interracial dating, and petitioner believes that it would be impossible to enforce this prohibition absent the exclusion of Negroes.
In 1942, the Service issued petitioner a ruling letter under § 101 (6) of the Internal Revenue Code of 1939, the predecessor of § 501 (c)(3). In 1970, however, the Service announced that it would no longer allow §;501 (c)(3) status for private schools maintaining racially, discriminatory admissions policies and that it would no longer treat contributions to such schools as tax deductible. See Rev. Rui. 71-447, 1971-2 Cum. Bull. 230. The Service requested proof of a nondiscriminatory admissions policy from all such schools and warned that tax-exempt ruling letters would be reviewed in light of the information provided. At the end of 1970, petitioner advised the Service that it did not admit Negroes, and in September 1971, further stated that it had no intention of altering this policy. The Commissioner’ of Internal Revenue theréfore instructed the District Director to commence administrative procedures leading to the revocation of petitioner’s § 501 (e)(3) ruling letter.
Petitioner brought these administrative proceedings to .a halt by filing suit in the United States District Court for the District of South Carolina for. preliminary and permanent injunctive relief preventing the Service from revoking or threatening to revoke petitioner’s tax-exempt status. Petitioner alleged irreparable injury in the form of substantial federal income tax liability and the loss of [736]*736contributions. Petitioner asserted that. the Service’s threatened action was outside its lawful authority and would violate petitioner’s rights to the free exercise of religion, to free association, and to due process and equal protection of the laws.
The District Court rejected a motion to dismiss for lack of jurisdiction, and it preliminarily enjoined the Service from revoking or threatening to revoke petitioner’s tax-exempt status and from withdrawing advance assurance of the deductibility of contributions made to, petitioner. Bob Jones University v. Connolly, 341 F. Supp. 277 (1971). The Court of Appeals for the Fourth Circuit reversed, with one judge dissenting. 472 F. 2d 903, reh. den., 476 F. 2d 259 (1973). That court held that petitioher’s suit, was báífed by the Anti-Injunction Act as interpreted by this Court in Enochs v. Williams Packing & Navigation Co., 370 U. S. 1. (1962).
in
The Anti-Injunction Act apparently has no recorded legislative history,9 but its language could scarcely be more explicit — “no suit for the purpose of restraining the assessment or collection of any tax shall be maintained in any court ....’’ The Court has interpreted the principal purpose of this- language to be the protection of the Government’s need to assess and collect taxes as expeditiously as possible with a minimum of preenforcement judicial interference, “and to. require that the legal right to the disputed sums be determined in a suit for refund.” Enochs v. Williams Packing & Navi[737]*737gation Co., supra, at 7. See also, e. g., State Railroad Tax Cases, 92 U. S. 575, 613-614 (1876). Cf. Cheatham v. United States, 92 U. S. 85, 88-89 (1876). The Court has also identified “a collateral objective of the Act — protection of the collector from litigation pending a suit for refund.” Williams Packing, supra, at 7-8.
In furtherance of these goals, the Court in its most recent reading gave the Act almost ■ literal effect. In Williams Packing, an employer sought to enjoin the collection of FICA and FUTA taxes that the employer alleged were not owed and would destroy its business. The Court held unanimously that the suit was barred by the Act. Only upon proof of the presence of two factors could the literati terms of § 7421 (a) be avoided: first, irreparable injury, the essential ‘prerequisite for injunctive relief in any case; and second, certainty of success on the merits. Id., at 6-7. An injunction could issue only “if it is clear that under no circumstances could the Government ultimately prevail . . . .” Id., at 7. And this determination would be made on the basis of the information available to the Governmentat the time of the suit. “Only if it is-then apparent that, under the most liberal view of the law and the facts, the United States cannot establish its claim, may the suit for an injunction be maintained.” Ibid.
■Perhaps in recognition of the stringent nature of the Williams Packing standard and its implications for this case, petitioner makes little effort to argue that it can meet that test. Rather, it asserts that the Anti-Injunction Act, properly construed, is not applicable, that Williams Packing is not the controlling reading of the Act, and that rejection- of both these contentions would work a denial of due process of law. We find these arguments unpersuasive.
[738]*738A ■
First, petitioner contends that the Act is inapplicable because this is not a suit “for the purpose of restraining the assessment or collection of any tax.....” Under petitioner’s theory, its suit is intended solely to compel the Servic^ to refrain from withdrawing petitioner’s § 501 (c) (3) ruling letter and from depriving petitioner’s donors of advance assurance of deductibility. Petitioner describes its goal as the maintenance of the flow of contributions, not the 'obstruction of revenue.
Petitioner’s complaint and supporting documents filed in the District Court belie any notion that this is not a suit to enjoin the assessment or collection of federal taxes from petitioner. In support of its claim of irreparable injury, petitioner alleged in part that it would be subject to “substantial” federal income tax liability if the Service were allowed to carry out its threatened action. App. 6. Petitioner buttressed this contention with sworn affidavits alleging federal income tax liability of three-quarters of a million dollars for one year and in excess of half a million dollars for another and stressing the1 detrimental effect such tax liability would have on petitioner’s capacity to -operate its institution, to support its personnel, and to continue with its expansion plans. Id., at 10-11, 43-^44. These allegations leave little doubt that a primary purpose of this lawsuit.is ¿o prevent the Service from assessing and collecting incolne taxes from petitioner.
We recognize that petitioner’s assertions that |t will' owe federal income-taxes should its § 501 (c)(3).status be revoked are open to debate, because they are based in part on a failure to take into account possible deductions for depreciation of plant and equipment. Even if it could bé shown, however, that petitioner would owe .no federal income taxes if its . §501 (c)(3) status were [739]*739revoked, this would still be a suit to restrain .the assessment or collection of taxes because petitioner would also be liable for FICA'and FUTA taxes. Section 7421 (a) speaks of “any tax”; it .does not differentiate between federal income taxes or FICA or FUTA taxes. See, e. g., Williams Packing, supra. Moreover, petitioner seeks to. restrain the collection of taxes from its donors — to force the Service to continue to provide advance assurance to those donors that contributions to petitioner will- be recognized as tax deductible, thereby reducing their tax liability. Although in this regard petitioner seeks to lower the taxes of those other than itself, the Act is nonetheless controlling.10 Thus in. any of its implications, this case falls- within the. literal' scope and the purposes of the Act.
Petitioner further contends that the Service’s actions do not represent an effort to protect the revenues but an attempt to regulate the admissions policies of private universities. Under- this line of argument, the Anti-[740]*740Injunction Act is said to be inapplicable because the case does not truly involve taxes. We disagree.
The Service bases its present position with regard to the tax status of segregative private schools on its interpretatibn of the Code.11 There is no evidence that that position does not represent a good-faith effort to enforce the technical requirements of the tax laws, and, without indicating a view as to whether the Service’s interpretation is correct, we cannot say that its position has no legal basis or is unrelated to the protection of the revenues. The Act is therefore applicable. Petitioner’s attribution of non-tax-related motives to the Service ignores the fact that petitioned has not shown that the. Service’s action, is without an independent basis in the requirements of the Code. Moreover, petitioner’s argument fails to give appropriate weight to Bailey v. George, 259 U. S. 16 (1922). In that case, the Court held that the Act blocked a pre-enforcement suit to enjoin collection of the federal Child Labor Tax, although •the tax was challenged as a regulatory measure beyondthet taxing power of Congress. . Significantly, the Court announced Bailey v. George on the same day that it issued Bailey v. Drexel Furniture Co., 259 U. S. 20 [741]*741(1922), a tax-refund case in which the Court struck down the Child Labor Tax Law as unconstitutional on the grounds that the taxpayer attempted to raise prematurely in Bailey v. George.12
. Petitioner also argues that § 7421 (a) is not controlling because when the Act was passed in 1867 Congress could not possibly have foreseen something as sophisticated as the comparatively recent ruling-letter program13 and the special importance of that program for § 501 (c) (3) organizations. This argument proves too much, however, since the same Congress also could not have foreseen, for example, FICA or FUTA taxes, to which the prohibitory command of § 7421 (a) indisputably applies. See, e. g., Williams Packing, supra. Moreover, through the years Congress has repeatedly re-enacted the Anti-Injunction Act14 at times when it was obviously aware of [742]*742the continuously increasing complexity of the federal tax system.15
B
Petitioner next argues that Enochs v. Williams Packing & Navigation Co., supra, does not constitute an all-encompássing reading of the Act. Petitioner contends, on - the ' basis of prior precedents, that § 7421 (a) is subject to judicially created exceptions other than the “under no circumstances” ' test an-' nounced in Williams Packing. But the Court’s unanimous opinion in Williams Packing indicates that the case was meant to be the capstone to judicial construction of the Act. It spells an end to a cyclical pattern' of allegiance to the plain meaning of the Act, followed by periods of uncertainty causéd by a judicial departure from that meaning, and followed in turn by the Court’s rediscovery of the ActV purpose.
During the first half century of the Act’s existence, the Court gave, it literal .force, without regard to the character of the tax, the nature of the pre-enforcement challenge to it, or the status of the plaintiff. See State Railroad Tax Cases, 92 U. S., at 613-614; Snyder v. Marks, 109 U. S. 189 (1883); Pacific Steam Whaling. Co. v. United States, 187 U. S. 447 (1903); Dodge v. Osborn, 240 U. S. 118 (1916); Bailey v. George, 259 U. S. 16 (1922).16 Occasionally, however, the Court noted in [743]*743dictum that unspecified extraordinary and exceptional circumstances might justify an injunction despite the Act. E. g., Dodge v. Osborn, supra, at 122; Bailey v. George, supra, at 20. In 1922, the Court seized upon these dicta and, permitted, pre-enforcement injunctive suits against tax statutes that were viewed as penalties or as adjuncts to the criminal law. Hill v. Wallace, 259 U. S. 44 (1922); Lipke v. Lederer, 259 U. S. 557 (1922); Regal Drug Corp. v. Wardell, 260 U. S. 386 (1922). Shortly thereafter, however, the- Court made clear that Hill, Lipke, and Regal Drug were of narrow scope and had no application to pre-enforcement challenges to truly revenue-raising tax statutes. Graham v. Du Pont, 262 U. S. 234 (1923).17 Thus, the Court’s first departure from a literal reading of the Act produced a prompt correction in course.
[744]*744In the 1930’s the Court decided Miller v. Standard Nut Margarine Co., 284 U. S. 498 (1932), and Allen v. Regents of the University System, of Georgia, 304 U. S. 439 (1938), the cases relied on most heavily by petitioner. Standard Nut set forth a new definition of the extraordinary and exceptional circumstances test, which was followed in Regents. In Standard Nut the Court stated that the Act is merely “declaratory of the principle” of cases prior to its passage- that equity usually, but not 'always, disavows interference with tax collection; thus, the Act was to be construed “as near as may be in harmony with [equity doctrine] and the reasons upon which it rests.” 284 U. S., at 509. Through this interpretation, the concept of extraordinary and exceptional circumstances was reduced to the traditional equitable requirements for issuance of an injunction.
Standard Nut was such a significant deviation from, precedent that it was referred to by a commentator at the time as “a tribute to the tenacity of the American taxpayer” and “little short of phenomenal.”18 Read literally, the Court’s opinion effectively repealed the Act, since the Act wa§ viewed as requiring nothing more than equity doctrine had demanded before the Act’s passage. The incongruity of this positional as not escaped notice.19 . It undoubtedly led directly to the Court’s re[745]*745examination of the requirements of the Act in Williams Packing, the second time the Court has undertaken to rehabilitate the Act following debilitating départures from its explicit language. See Graham v. Du Pont, supra.
Williams Packing switched the focus of the extraordinary and exceptional circumstances test from a showing of the degree of harm to the plaintiff absent an injunction to the requirement that it be established that the Service’s action is plainly without a legal basis. The Court in essence read Standard Nut- not'as án instance of irreparable injury but as a case where the Service had no chance of success on the merits. 370 U. S., at 7. And the Court explicitly held that the Act may not be evaded “merely because collection would cause an irreparable injury, such as the ruination of the taxpayer’s enterprise.” Id., at 6. Yet petitioner’s argument that we should find Williams Packing inapplicable turns, in the last analysis, on its claim that' to do otherwise would subject it to great harm. The Court rejected that consideration in Williams Packing itself, and we reject it as a reason for' finding that case not controlling. Under the language of the Act, the degree of harm is not a factQr, and as a matter of judicial Construction-, it does not provide a meaningful stopping point, between Standard Ny,t and Williams Packing. Acceptance of petitioner’s irreparable injury argument would simply [746]*746revive the evisceration of the Act inherent in Standard Nut.
C
. Assuming, arguendo, the applicability of § 7421 (a) and Williams Packing, petitioner, contends that forcing it to meet the standards of those authorities will deny it due process of law in light .of the irreparable injury it will suffer pending resort to alternative procedures for review and of the alleged inadequacies of those remedies at law. The Court. dismissed out of hand similar contentions nearly 60 years ago,20 and we find such arguments no more compelling.now than then.
This is not a case in which an aggrieved, party has no access at all to judicial review. Were that true, our conclusion might well be different. If, as alleged in its complaint, petitioner will have taxable income upon the withdrawal of its § 501 (c) (3) status, it may in accordance with prescribed procedures petition the .Tax Court to review the assessment of income taxes! Alternatively, petitioner may pay income taxes, or, in their absence, an installment of FICA' or FUTA taxes, exhaust the Service’s internal refund procedures, and then bring suit for a refund. These review procedures offer petitioner a full, albeit delayed, Opportunity to litigate the legality of the Service’s revocation of tax-exempt status and withdrawal of advance assurance of deductibility. See, e. g., Christian Echoes National Ministry, Inc. v. United States, [747]*747470 F. 2d 849 (CA10 1972), cert. denied, 414 U. S. 864 (1973); Center on Corporate Responsibility, Inc. v. Shultz, 368 F. Supp. 863 (DC 1973).21
We do not say that these avenues of review áre the best that can be. devised. They present serious problems of delay, during which the flow of donations to an organization will be impaired and in some cases perhaps even terminated. But, as the Sfervice notes, some delay may be an inevitable consequence of the fact that disputes between the Service and a party challenging the Service’s actions are not susceptible of instant resolution through litigation. And although the congressional restriction to postenforcement review may place an organization claiming tax-exempt-status in a. precarious financial position, the problems presented do not rise to the level of constitutional infirmities, in light of the powerful governmental interests in protecting the administration of the tax system from premature judicial interferencé, e. g., Cheatham v. United States, 92 U. S., at 88-89; State [748]*748Railroad Tax Cases, 92 U. S., at 613-614, and of the opportunities for review that are available.22
IV
Since we hold that Williams Packing, supra, governs this case, the remaining issue is whether petitioner has met the standards of that case. Without deciding the [749]*749merits, we think that petitioner’s First Amendment, due process, and equal protection contentions are sufficiently debatable to foreclose any notion that “under no circumstances could the Government ultimately prevail ...370 U. S., at 7. See, e. g., Green v. Connally, 330 F. Supp. 1150 (DC), aff’d per curiam sub nom. Coit v. Green, 404 U. S. 997 (1971). Accordingly, the Court, of Appeals did not err in holding that § 7421 (a) deprived the District Court of jurisdiction to issue the injunctive relief petitioner sought.
In holding that § 7421 (a) blocks the present suit, we are not unaware that Congress has imposed an especially harsh regime on §501 (c)(3) organizations threatened with loss of tax-exempt status and with withdrawal of advance assurance of deductibility of contributions. Á former Commissioner of the Internal Revenue Service has sharply critipized the system applicable to such organizations.23 The degree of bureaucratic control [750]*750that, practically speaking, has been placed in the Service over those in petitioner’s position is susceptible of abuse, regardless of how conscientiously the Service may attempt to carry out its responsibilities. Specific treatment of not-for-profit organizations to allow them to seek pre-enforcement review may well merit consideration. • But this matter is for Congress, which is the appropriate body to weigh the relevant, policy-laden considerations, ', such as the harshness of the present law, the consequences of an unjustified revocation of § 501 (c) (3) status, the number of organizations in any year threatened with such'revocation, the comparability of those organizations to others which rely on the Service’s ruling-letter program, and the litigation burden on the Service and the effect on the assessment and collection of federal taxes if the law were to be changed.
The judgment is affirmed.
It is so ordered.
Mr. Justice Douglas took no part in the decision of this case.