[239]*239Mr. Justice Jackson
delivered the opinion of the Court.
As this suit in equity was commenced in United States District Court it sought two kinds of specific relief: (1) a declaratory judgment that complainant’s carriage of motion picture film and newsreels between points in Utah constitutes interstate commerce; (2) that the Public Service Commission of Utah and its members be forever enjoined from interfering with such transportation over routes authorized by the Interstate Commerce Commission.
The complaint alleged a course of importing, processing and transporting picture film and newsreels to support the contention that carriage between points in Utah was so integrated with their interstate movement that the whole constituted interstate commerce. It averred that the Commission and its members “threaten to and are attempting to stop and prevent plaintiff from transporting motion picture film and newsreels between points and places within the State of Utah, and they are thereby interfering with the conduct of interstate commerce by the plaintiff and imposing an undue burden upon interstate commerce,” and that unless the defendants are enjoined they will “block, harass and prevent plaintiff in the transportation of said motion picture film and newsreels in Utah.”
The Commission and its members answered that respondent’s transportation between points in Utah was nothing more than intrastate commerce. They specifically denied attempting, threatening, or intending to interfere with or burden interstate commerce.
The District Court, after trial, sustained the contention of the Commission and dismissed the complaint. The Court of Appeals considered only “whether the intrastate transportations are nonetheless integral parts of in[240]*240terstate transportations.” 1 It held the evidence to warrant an affirmative answer, reversed the judgment of the District Court and ordered further proceedings in conformity with that view. We granted certiorari,2 requesting counsel to discuss whether a single judge could hear and determine the case in view of 28 U. S. C. § 2281. That section provides that an injunction restraining enforcement of a state statute or the order of an administrative body thereunder “shall not be granted” upon the ground of unconstitutionality unless the application is heard and determined by a district court of three judges as provided in 28 U. S. C. § 2284.
The respondent, which was plaintiff, contends that a three-judge court was not required, because the suit does not question constitutionality of any Utah statute nor the validity of any order of the State Commission. It says also that no injunction has been granted or even urged “outside of the naked recitation in the prayer of the Complaint.” It offered no evidence whatever of any past, pending or threatened action by the Utah Commission touching its business in any respect. The pleadings made that a clear-cut issue, which seems to have been completely ignored thereafter. The only issues defined on pretrial hearing were whether as matter of fact and of law the within-state transportation constituted interstate commerce. The trial court, however, made a general finding that no such interference had been made or threatened, which was not reversed or mentioned by the Court of Appeals.
For more reasons than one it is clear that this proceeding cannot result in an injunction on constitutional grounds. In addition to defects that will appear in our discussion of declaratory relief, it is wanting in equity [241]*241because there is no proof of any threatened or probable act of the defendants which might cause the irreparable injury essential to equitable relief by injunction.
The respondent appears to have abandoned the suit as one for injunction but seeks to support it as one for declaratory judgment, hoping thereby to avoid both the three-judge court requirement and the necessity for proof of threatened injury. Whether declaratory relief is appropriate under the circumstances of this case apparently was not considered by either of the courts below. But that inquiry is one which every grant of this remedy must survive.
The Declaratory Judgment Act of 1934, now 28 U. S. C. § 2201, styled “creation of remedy,” provides that in a case of actual controversy a competent court may “declare the rights and other legal relations” of a party “whether or not further relief is or could be sought.” This is an enabling Act, which confers a discretion on the courts rather than an absolute right upon the litigant.
Previous to its enactment there were responsible expressions of doubt that constitutional limitations on federal judicial power would permit any federal declaratory judgment procedure. Cf. Liberty Warehouse Co. v. Grannis, 273 U. S. 70; Willing v. Chicago Auditorium Assn., 277 U. S. 274; Arizona v. California, 283 U. S. 423; Piedmont & N. R. Co. v. United States, 280 U. S. 469. Finally, as the practice extended in the states, we reviewed a declaratory judgment rendered by a state court and held that a controversy which would be justiciable in this Court if presented in a suit for injunction is not the less so because the relief was declaratory. Nashville, C. & St. L. R. Co. v. Wallace, 288 U. S. 249. Encouraged by this and guided by the experience of the thirty-four states that had enacted such laws, the Senate Judiciary Committee recommended an adaptation of the principle to federal practice. Its enabling clause was narrower [242]*242than that of the Uniform Act adopted in 1921 by the Commissioners on Uniform State Laws, which gave comprehensive power to declare rights, status and other legal relations. The Federal Act omits status and limits the declaration to cases of actual controversy.3
This Act was adjudged constitutional only by interpreting it to confine the declaratory remedy within conventional “case or controversy” limits. In Ashwander v. Tennessee Valley Authority, 297 U. S. 288, 325, the Court said, “The Act of June 14, 1934, providing for declaratory judgments, does not attempt to change the essential requisites for the exercise of judicial power” which still was to be tested by such established principles as that “the judicial power does not extend to the determination of abstract questions” and that “claims based merely upon 'assumed potential invasions’ of rights are not enough to warrant judicial intervention.”
In Aetna Life Insurance Co. v. Haworth, 300 U. S. 227, Mr.
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[239]*239Mr. Justice Jackson
delivered the opinion of the Court.
As this suit in equity was commenced in United States District Court it sought two kinds of specific relief: (1) a declaratory judgment that complainant’s carriage of motion picture film and newsreels between points in Utah constitutes interstate commerce; (2) that the Public Service Commission of Utah and its members be forever enjoined from interfering with such transportation over routes authorized by the Interstate Commerce Commission.
The complaint alleged a course of importing, processing and transporting picture film and newsreels to support the contention that carriage between points in Utah was so integrated with their interstate movement that the whole constituted interstate commerce. It averred that the Commission and its members “threaten to and are attempting to stop and prevent plaintiff from transporting motion picture film and newsreels between points and places within the State of Utah, and they are thereby interfering with the conduct of interstate commerce by the plaintiff and imposing an undue burden upon interstate commerce,” and that unless the defendants are enjoined they will “block, harass and prevent plaintiff in the transportation of said motion picture film and newsreels in Utah.”
The Commission and its members answered that respondent’s transportation between points in Utah was nothing more than intrastate commerce. They specifically denied attempting, threatening, or intending to interfere with or burden interstate commerce.
The District Court, after trial, sustained the contention of the Commission and dismissed the complaint. The Court of Appeals considered only “whether the intrastate transportations are nonetheless integral parts of in[240]*240terstate transportations.” 1 It held the evidence to warrant an affirmative answer, reversed the judgment of the District Court and ordered further proceedings in conformity with that view. We granted certiorari,2 requesting counsel to discuss whether a single judge could hear and determine the case in view of 28 U. S. C. § 2281. That section provides that an injunction restraining enforcement of a state statute or the order of an administrative body thereunder “shall not be granted” upon the ground of unconstitutionality unless the application is heard and determined by a district court of three judges as provided in 28 U. S. C. § 2284.
The respondent, which was plaintiff, contends that a three-judge court was not required, because the suit does not question constitutionality of any Utah statute nor the validity of any order of the State Commission. It says also that no injunction has been granted or even urged “outside of the naked recitation in the prayer of the Complaint.” It offered no evidence whatever of any past, pending or threatened action by the Utah Commission touching its business in any respect. The pleadings made that a clear-cut issue, which seems to have been completely ignored thereafter. The only issues defined on pretrial hearing were whether as matter of fact and of law the within-state transportation constituted interstate commerce. The trial court, however, made a general finding that no such interference had been made or threatened, which was not reversed or mentioned by the Court of Appeals.
For more reasons than one it is clear that this proceeding cannot result in an injunction on constitutional grounds. In addition to defects that will appear in our discussion of declaratory relief, it is wanting in equity [241]*241because there is no proof of any threatened or probable act of the defendants which might cause the irreparable injury essential to equitable relief by injunction.
The respondent appears to have abandoned the suit as one for injunction but seeks to support it as one for declaratory judgment, hoping thereby to avoid both the three-judge court requirement and the necessity for proof of threatened injury. Whether declaratory relief is appropriate under the circumstances of this case apparently was not considered by either of the courts below. But that inquiry is one which every grant of this remedy must survive.
The Declaratory Judgment Act of 1934, now 28 U. S. C. § 2201, styled “creation of remedy,” provides that in a case of actual controversy a competent court may “declare the rights and other legal relations” of a party “whether or not further relief is or could be sought.” This is an enabling Act, which confers a discretion on the courts rather than an absolute right upon the litigant.
Previous to its enactment there were responsible expressions of doubt that constitutional limitations on federal judicial power would permit any federal declaratory judgment procedure. Cf. Liberty Warehouse Co. v. Grannis, 273 U. S. 70; Willing v. Chicago Auditorium Assn., 277 U. S. 274; Arizona v. California, 283 U. S. 423; Piedmont & N. R. Co. v. United States, 280 U. S. 469. Finally, as the practice extended in the states, we reviewed a declaratory judgment rendered by a state court and held that a controversy which would be justiciable in this Court if presented in a suit for injunction is not the less so because the relief was declaratory. Nashville, C. & St. L. R. Co. v. Wallace, 288 U. S. 249. Encouraged by this and guided by the experience of the thirty-four states that had enacted such laws, the Senate Judiciary Committee recommended an adaptation of the principle to federal practice. Its enabling clause was narrower [242]*242than that of the Uniform Act adopted in 1921 by the Commissioners on Uniform State Laws, which gave comprehensive power to declare rights, status and other legal relations. The Federal Act omits status and limits the declaration to cases of actual controversy.3
This Act was adjudged constitutional only by interpreting it to confine the declaratory remedy within conventional “case or controversy” limits. In Ashwander v. Tennessee Valley Authority, 297 U. S. 288, 325, the Court said, “The Act of June 14, 1934, providing for declaratory judgments, does not attempt to change the essential requisites for the exercise of judicial power” which still was to be tested by such established principles as that “the judicial power does not extend to the determination of abstract questions” and that “claims based merely upon 'assumed potential invasions’ of rights are not enough to warrant judicial intervention.”
In Aetna Life Insurance Co. v. Haworth, 300 U. S. 227, Mr. Chief Justice Hughes used the whole catalogue of familiar phrases to define and delimit the measure of this new remedy. If its metes and bounds are not clearly marked, it is because his available verbal markers are themselves elastic, inconstant and imprecise. It applies, he points out, only to “cases and controversies in the constitutional sense” of a nature “consonant with the exercise of the judicial function” and “appropriate for judicial determination.” Each must present a “justiciable controversy” as distinguished from “a difference or dispute of a hypothetical or abstract character .... The controversy must be definite and concrete, touching the legal relations of parties having adverse legal interests. . . . It must be a real and substantial controversy admitting of specific relief through a decree of a conclusive character, as' distinguished from an opinion advising what the law [243]*243would be upon a hypothetical state of facts.” The relief is available only for a “concrete case admitting of an immediate and definitive determination of the legal rights of the parties.” Id., at 240, 241.
Other sources have stated relevant limitations. The Senate Judiciary Committee report regarded the 1,200 American decisions theretofore rendered on the subject as establishing that “the issue must be real, the question practical and not academic, and the decision must finally settle and determine the controversy.”4 Indeed the Uniform Act, unlike the Federal Act, expressly declares the discretion of the court to refuse a decree that would not “terminate the uncertainty or controversy giving rise to the proceeding.” In recommending Rule 57 of the Federal Rules of Civil Procedure, in order to provide procedures for the declaratory decree, the Committee noted “A declaration may not be rendered if a special statutory proceeding has been provided for the adjudication of some special type of case . . . .” 5
But when all of the axioms have been exhausted and all words of definition have been spent, the propriety of declaratory relief in a particular case will depend upon a circumspect sense of its fitness informed by the teachings and experience concerning the functions and extent of federal judicial power. While the courts should not be reluctant or niggardly in granting this relief in the cases for which it was designed, they must be alert to avoid imposition upon their jurisdiction through obtaining futile or premature interventions, especialy in the field of public law. A maximum of caution is necessary in the type of litigation that we have here, where a ruling is sought that would reach far beyond the particular case. Such differ-[244]*244enees of opinion or conflicts of interest must be “ripe for determination” as controversies over legal rights. The disagreement must not be nebulous or contingent but must have taken on fixed and final shape so that a court can see what legal issues it is deciding, what effect its decision will have on the adversaries, and some useful purpose to be achieved in deciding them.
The complainant in this case does not request an adjudication that it has a right to do, or to have, anything in particular. It does not ask a judgment that the Commission is without power to enter any specific order or take any concrete regulatory step. It seeks simply to establish that, as presently conducted, respondent’s carriage of goods between points within as well as without Utah is all interstate commerce. One naturally asks, “So what?” To that ultimate question no answer is sought.
A multitude of rights and immunities may be predicated upon the premise that a business consists of interstate commerce. What are the specific ones in controversy? The record is silent and counsel little more articulate. We may surmise that the purpose to be served by a declaratory judgment is ultimately the same as respondent’s explanation of the purposes of the injunction it originally asked, which is “to guard against the possibility that said Commission would attempt to prevent respondent from operating under its certificate from the Interstate Commerce Commission.” (Emphasis supplied.)
In this connection, Wycoff Co. v. Public Service Commission, -Utah -, 227 P. 2d 323 (1951), is brought to our attention. From this it appears that respondent and its predecessors in interest long made it a practice to obtain from the Utah Commission certificates to authorize this carriage of film commodities between points in Utah. But the Supreme Court of Utah, in the cited case, sustained the Commission in denying such an application [245]*245upon a finding that the field already was adequately served. We are also told that the Commission filed a petition in a Utah state court to enjoin respondent from operating between a few specified locations within the State, but that process was never served and nothing in the record tells us what has happened to this action. We may conjecture that respondent fears some form of administrative or judicial action to prohibit its service on routes wholly within the State without the Commission’s leave. What respondent asks is that it win any such case before it is commenced. Even if respondent is engaged solely in interstate commerce, we cannot say that there is nothing whatever that the State may require. Eichholz v. Commission, 306 U. S. 268, 273.
A declaratory judgment may be the basis of further relief necessary or proper against the adverse party (28 U. S. C. § 2202). The carrier’s idea seems to be that it can now establish the major premise of an exemption, not as an incident of any present declaration of any specific right or immunity, but to hold in readiness for use should the Commission at any future time attempt to apply any part of a complicated regulatory statute to it. If there is any more definite or contemporaneous purpose to this case, neither this record nor the briefs make it clear to us. We think this for several reasons exceeds any permissible discretionary use of the Federal Declaratory Judgment Act.
In the first place, this dispute has not matured to a point where we can see what, if any, concrete controversy will develop. It is much like asking a declaration that the State has no power to enact legislation that may be under consideration but has not yet shaped up into an enactment. If there is any risk of suffering penalty, liability or prosecution, which a declaration would avoid, it is not pointed out to us. If and when the State Commission takes some action that raises an issue of its power, [246]*246some further declaration would be necessary to any complete relief. The proposed decree cannot end the controversy.
Nor is it apparent that the present proceeding would serve a useful purpose if at some future date the State undertakes regulation of respondent. After a sifting of evidence and a finding of facts as they are today, there is no assurance that changes of significance may not take place before the State decides to move. Of course, the remedy is not to be withheld because it necessitates weighing conflicting evidence or deciding issues of fact as well as law. That is the province of courts. Aetna Life Insurance Co. v. Haworth, supra, at 242, and see Perkins v. Elg, 307 U. S. 325; Currin v. Wallace, 306 U. S. 1. But when the request is not for ultimate determination of rights but for preliminary findings and conclusions intended to fortify the litigant against future regulation, it would be a rare case in which the relief should be granted. Cf. Coffman v. Breeze Corporations, Inc., 323 U.S. 316.
Even when there is no incipient federal-state conflict, the declaratory judgment procedure will not be used to pre-empt and prejudge issues that are committed for initial decision to an administrative body or special tribunal any more than it will be used as a substitute for statutory methods of review. It would not be tolerable, for example, that declaratory judgments establish that an enterprise is not in interstate commerce in order to forestall proceedings by the National Labor Relations Board, the Interstate Commerce Commission or many agencies that are authorized to try and decide such an issue in the first instance. Cf. Myers v. Bethlehem Shipbuilding Corp., 303 U. S. 41; Eccles v. Peoples Bank, 333 U. S. 426. See Colegrove v. Green, 328 U. S. 549. Responsibility for effective functioning of the administrative process can[247]*247not be thus transferred from the bodies in which Congress has placed it to the courts.
But, as the declaratory proceeding is here invoked, it is even less appropriate because, in addition to foreclosing an administrative body, it is incompatible with a proper federal-state relationship. The carrier, being in some disagreement with the State Commission, rushed into federal court to get a declaration which either is intended in ways not disclosed to tie the Commission’s hands before it can act or it has no purpose at all.
Declaratory proceedings in the federal courts against state officials must be decided with regard for the implications of our federal system. State administrative bodies have the initial right to reduce the general policies of state regulatory statutes into concrete orders and the primary right to take evidence and make findings of fact. It is the state courts which have the first and the last word as to the meaning of state statutes and whether a particular order is within the legislative terms of reference so as to make it the action of the State. We have disapproved anticipatory declarations as to state regulatory statutes, even where the case originated in and was entertained by courts of the State affected. Alabama State Federation of Labor v. McAdory, 325 U. S. 450. Anticipatory judgment by a federal court to frustrate action by a state agency is even less tolerable to our federalism. Is the declaration contemplated here to be res judicata, so that the Commission cannot hear evidence and decide any matter for itself? If so, the federal court has virtually lifted the case out of the State Commission before it could be heard. If not, the federal judgment serves no useful purpose as a final determination of rights.
The procedures of review usually afford ample protection to a carrier whose federal rights are actually invaded, and there are remedies for threatened irreparable injuries. State courts are bound equally with the federal courts by [248]*248the Federal Constitution and laws. Ultimate recourse may be had to this Court by certiorari if a state court has allegedly denied a federal right.
In this case, as in many actions for declaratory judgment, the realistic position of the parties is reversed.6 The plaintiff is seeking to establish a defense against a cause of action which the declaratory defendant may assert in the Utah courts. Respondent here has sought to ward off possible action of the petitioners by seeking a declaratory judgment to the effect that he will have a good defense when and if that cause of action is asserted. Where the complaint in an action for declaratory judgment seeks in essence to assert a defense to an impending or threatened state court action, it is the character of the threatened action, and not of the defense, which will determine whether there is federal-question jurisdiction in the District Court. If the cause of action, which the declaratory defendant threatens to assert, does not itself involve a claim under federal law, it is doubtful if a federal court may entertain an action for a declaratory judgment establishing a defense to that claim. This is dubious even though the declaratory complaint sets forth a claim of federal right, if that right is in reality in the nature of a defense to a threatened cause of action. Federal courts will not seize litigations from state courts merely because one, normally a defendant, goes to federal court to begin his federal-law defense before the state court begins the case under state law. Tennessee v. Union & Planters’ Bank, 152 U. S. 454; The Fair v. Kohler Die & Specialty Co., 228 U. S. 22; Taylor v. Anderson, 234 U. S. 74.
Since this case should be dismissed in any event, it is not necessary to determine whether, on this record, the [249]*249alleged controversy over an action that may be begun in state court would be maintainable under the head of federal-question jurisdiction. But we advert to doubts upon that subject to indicate the injury that would be necessary if the case clearly rested merely on threatened suit in state court, as, for all we can learn, it may.
We conclude that this suit cannot be entertained as one for injunction and should not be continued as one for a declaratory judgment. The judgment below should be reversed and modified to direct that the action be dismissed.
Reversed and so ordered.