Justice Rehnquist
delivered the opinion of the Court.
Petitioners brought two separate class actions in the United States District Court for the Eastern District of Michigan against respondent Director of the Michigan Department of Social Services, claiming that respondent’s calculations of benefits under the federal Aid to Families With Dependent Children (AFDC) program violated certain provisions of that federal law. Before a final determination on the merits of either case could be made, Congress amended the relevant statutory provisions. It is undisputed that respondent’s calculations thereafter have conformed to federal law. Notwithstanding this fact, petitioners claim that they were entitled to have the District Court award them both “notice relief” and a declaration that respondent’s prior conduct violated federal law. The District Court denied petitioners both forms of relief, and the Court of Appeals for the Sixth Circuit affirmed. We now affirm the judgment of the Court of Appeals, holding that the Eleventh Amendment [66]*66to the United States Constitution and applicable principles governing the issuance of declaratory judgments forbid the award of either form of relief.
The two class actions involved in this case were brought on behalf of recipients of benefits disbursed under the AFDC program. See 42 U. S. C. §§601-615. The AFDC program uses a person’s earned income in determining eligibility for, and the amount of, benefits. See §602. The complaints alleged that certain of respondent’s policies and regulations violated 42 U. S. C. § 1983 by inflating their respective class members’ earned income and thereby causing a reduction or termination of AFDC benefits contrary to the applicable federal law.
One putative class challenged respondent’s policy of prohibiting the deduction of child care costs in the calculation of earned income. While the case was pending in the District Court, Congress changed the relevant provisions of the AFDC program to expressly require participating States to deduct child care expenses up to a specified amount. Respondent thereafter brought state policy into compliance with this amendment and began deducting child care expenses in the calculation of earned income. There is no claim that respondent’s current child care deduction policy violates federal law.
The other putative class challenged respondent’s policy of automatically including stepparents’ income in the calculation of earned income. The District Court issued a preliminary injunction preventing respondent from enforcing its automatic inclusion policy. But again, while the matter was pending on the merits, Congress amended the relevant section of the AFDC program to expressly require States to include stepparent income in the calculation of earned income. The parties thereafter stipulated that the District Court should terminate its preliminary injunction as of the effective date of the amendment. Here, too, there is no claim that respondent has not complied with federal law since that time.
[67]*67The District Court granted respondent’s motions to dismiss in each case. It held in each that the changes in federal law rendered moot the claims for prospective relief, and that the remaining claims for declaratory and notice relief related solely to past violations of federal law. Such retrospective relief, the court determined, is barred by the Eleventh Amendment.
The Court of Appeals affirmed in a consolidated appeal. Banas v. Dempsey, 742 F. 2d 277 (1984). It agreed that the changes in federal law rendered moot the claims for prospective relief. Id., at 281-283. It also agreed that because the sought-after notice and declaratory relief was retrospective in nature, the relief was barred by Edelman v. Jordan, 415 U. S. 651 (1974). 742 F. 2d, at 286-288. It reasoned that when there is no prospective relief to which notice can be ancillary, even notice of the sort approved in Quern v. Jordan, 440 U. S. 332 (1979), cannot escape the Eleventh Amendment bar. 742 F. 2d, at 287-288. Declaratory relief is similarly barred under such circumstances, it explained, because such relief could relate solely to past violations of federal law. Id., at 288.
We granted certiorari to resolve a conflict in the Circuits over whether federal courts may order the giving of notice of the sort approved in Quern v. Jordan, supra, or issue a declaratory judgment that state officials violated federal law in the past when there is no ongoing violation of federal law. The decision by the Court of Appeals in this case agrees with the result in Colbeth v. Wilson, 554 F. Supp. 539 (Vt. 1982), aff’d, 707 F. 2d 57 (CA2 1983) (per curiam), but it conflicts with the decisions in Appleyard v. Wallace, 754 F. 2d 955, 959-963 (CA11 1985); Randall v. Lukhard, 729 F. 2d 966 (CA4) (en banc), cert. denied, 469 U. S. 872 (1984); Beltran v. Myers, 701 F. 2d 91, 94 (CA9) (per curiam), cert. denied, 462 U. S. 1134 (1983); and Silva v. Vowell, 621 F. 2d 640, 650-654 (CA5 1980), which all allowed notice relief even though changes in state policy or federal law rendered moot [68]*68any claim for injunctive relief stopping ongoing violations of federal law. We now affirm the decision of the Court of Appeals.
The Eleventh Amendment confirms that “the fundamental principle of sovereign immunity limits the grant of judicial authority in Art. III.” Pennhurst State School & Hospital v. Halderman, 465 U. S. 89, 98 (1984). Because of the Eleventh Amendment, States may not be sued in federal court unless they consent to it in unequivocal terms or unless Congress, pursuant to a valid exercise of power, unequivocally expresses its intent to abrogate the immunity. Id., at 99. The landmark case of Ex parte Young, 209 U. S. 123 (1908), created an exception to this general principle by asserting that a suit challenging the constitutionality of a state official’s action in enforcing state law is not one against the State. Id., at 159-160. The theory of Young was that an unconstitutional statute is void, id., at 159, and therefore does not “impart to [the official] any immunity from responsibility to the supreme authority of the United States.” Id., at 160. Young also held that the Eleventh Amendment does not prevent federal courts from granting prospective injunctive relief to prevent a continuing violation of federal law. Id., at 155-156, 159. We have refused to extend the reasoning of Young, however, to claims for retrospective relief. See Pennhurst, supra, at 102-103; Quern v. Jordan, supra, at 337; Edelman v. Jordan, supra, at 668.
Both prospective and retrospective relief implicate Eleventh Amendment concerns, but the availability of prospective relief of the sort awarded in Ex parte Young gives life to the Supremacy Clause.
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Justice Rehnquist
delivered the opinion of the Court.
Petitioners brought two separate class actions in the United States District Court for the Eastern District of Michigan against respondent Director of the Michigan Department of Social Services, claiming that respondent’s calculations of benefits under the federal Aid to Families With Dependent Children (AFDC) program violated certain provisions of that federal law. Before a final determination on the merits of either case could be made, Congress amended the relevant statutory provisions. It is undisputed that respondent’s calculations thereafter have conformed to federal law. Notwithstanding this fact, petitioners claim that they were entitled to have the District Court award them both “notice relief” and a declaration that respondent’s prior conduct violated federal law. The District Court denied petitioners both forms of relief, and the Court of Appeals for the Sixth Circuit affirmed. We now affirm the judgment of the Court of Appeals, holding that the Eleventh Amendment [66]*66to the United States Constitution and applicable principles governing the issuance of declaratory judgments forbid the award of either form of relief.
The two class actions involved in this case were brought on behalf of recipients of benefits disbursed under the AFDC program. See 42 U. S. C. §§601-615. The AFDC program uses a person’s earned income in determining eligibility for, and the amount of, benefits. See §602. The complaints alleged that certain of respondent’s policies and regulations violated 42 U. S. C. § 1983 by inflating their respective class members’ earned income and thereby causing a reduction or termination of AFDC benefits contrary to the applicable federal law.
One putative class challenged respondent’s policy of prohibiting the deduction of child care costs in the calculation of earned income. While the case was pending in the District Court, Congress changed the relevant provisions of the AFDC program to expressly require participating States to deduct child care expenses up to a specified amount. Respondent thereafter brought state policy into compliance with this amendment and began deducting child care expenses in the calculation of earned income. There is no claim that respondent’s current child care deduction policy violates federal law.
The other putative class challenged respondent’s policy of automatically including stepparents’ income in the calculation of earned income. The District Court issued a preliminary injunction preventing respondent from enforcing its automatic inclusion policy. But again, while the matter was pending on the merits, Congress amended the relevant section of the AFDC program to expressly require States to include stepparent income in the calculation of earned income. The parties thereafter stipulated that the District Court should terminate its preliminary injunction as of the effective date of the amendment. Here, too, there is no claim that respondent has not complied with federal law since that time.
[67]*67The District Court granted respondent’s motions to dismiss in each case. It held in each that the changes in federal law rendered moot the claims for prospective relief, and that the remaining claims for declaratory and notice relief related solely to past violations of federal law. Such retrospective relief, the court determined, is barred by the Eleventh Amendment.
The Court of Appeals affirmed in a consolidated appeal. Banas v. Dempsey, 742 F. 2d 277 (1984). It agreed that the changes in federal law rendered moot the claims for prospective relief. Id., at 281-283. It also agreed that because the sought-after notice and declaratory relief was retrospective in nature, the relief was barred by Edelman v. Jordan, 415 U. S. 651 (1974). 742 F. 2d, at 286-288. It reasoned that when there is no prospective relief to which notice can be ancillary, even notice of the sort approved in Quern v. Jordan, 440 U. S. 332 (1979), cannot escape the Eleventh Amendment bar. 742 F. 2d, at 287-288. Declaratory relief is similarly barred under such circumstances, it explained, because such relief could relate solely to past violations of federal law. Id., at 288.
We granted certiorari to resolve a conflict in the Circuits over whether federal courts may order the giving of notice of the sort approved in Quern v. Jordan, supra, or issue a declaratory judgment that state officials violated federal law in the past when there is no ongoing violation of federal law. The decision by the Court of Appeals in this case agrees with the result in Colbeth v. Wilson, 554 F. Supp. 539 (Vt. 1982), aff’d, 707 F. 2d 57 (CA2 1983) (per curiam), but it conflicts with the decisions in Appleyard v. Wallace, 754 F. 2d 955, 959-963 (CA11 1985); Randall v. Lukhard, 729 F. 2d 966 (CA4) (en banc), cert. denied, 469 U. S. 872 (1984); Beltran v. Myers, 701 F. 2d 91, 94 (CA9) (per curiam), cert. denied, 462 U. S. 1134 (1983); and Silva v. Vowell, 621 F. 2d 640, 650-654 (CA5 1980), which all allowed notice relief even though changes in state policy or federal law rendered moot [68]*68any claim for injunctive relief stopping ongoing violations of federal law. We now affirm the decision of the Court of Appeals.
The Eleventh Amendment confirms that “the fundamental principle of sovereign immunity limits the grant of judicial authority in Art. III.” Pennhurst State School & Hospital v. Halderman, 465 U. S. 89, 98 (1984). Because of the Eleventh Amendment, States may not be sued in federal court unless they consent to it in unequivocal terms or unless Congress, pursuant to a valid exercise of power, unequivocally expresses its intent to abrogate the immunity. Id., at 99. The landmark case of Ex parte Young, 209 U. S. 123 (1908), created an exception to this general principle by asserting that a suit challenging the constitutionality of a state official’s action in enforcing state law is not one against the State. Id., at 159-160. The theory of Young was that an unconstitutional statute is void, id., at 159, and therefore does not “impart to [the official] any immunity from responsibility to the supreme authority of the United States.” Id., at 160. Young also held that the Eleventh Amendment does not prevent federal courts from granting prospective injunctive relief to prevent a continuing violation of federal law. Id., at 155-156, 159. We have refused to extend the reasoning of Young, however, to claims for retrospective relief. See Pennhurst, supra, at 102-103; Quern v. Jordan, supra, at 337; Edelman v. Jordan, supra, at 668.
Both prospective and retrospective relief implicate Eleventh Amendment concerns, but the availability of prospective relief of the sort awarded in Ex parte Young gives life to the Supremacy Clause. Remedies designed to end a continuing violation of federal law are necessary to vindicate the federal interest in assuring the supremacy of that law. See Pennhurst, supra, at 102. See also Milliken v. Bradley, 433 U. S. 267 (1977). But compensatory or deterrence interests are insufficient to overcome the dictates of the Eleventh Amendment. Petitioners concede that any claim they might [69]*69have had for the specific type of injunctive relief approved in Ex parte Young was rendered moot by the amendments to the AFDC program. They nevertheless seek “notice relief” of the type approved in Quern v. Jordan, arguing that notice is an independent form of prospective relief protected against the Eleventh Amendment bar by Ex parte Young. In taking this position, we think petitioners misconceive our Eleventh Amendment jurisprudence and our decision in Quern.
Quern was the last chapter in the litigation that initially gave rise to Edelman v. Jordan, supra. The plaintiffs in that litigation challenged a State’s administration of the federal-state program for Aid to the Aged, Blind, or Disabled (AABD). The District Court issued a declaratory judgment that current state regulations governing the administration of the program violated federal regulations then in effect.1 It therefore permanently enjoined the state officials from continuing to violate federal law. Although the language of the declaratory judgment was no broader than necessary to complement the injunction against the current violation of federal law, it implied that the defendants had violated federal law in the past. The District Court therefore issued a second injunction ordering the defendants to release and remit all AABD benefits that they had wrongfully withheld on account of their past violations of federal law. The Court of Appeals affirmed, Jordan v. Weaver, 472 F. 2d 985 (CA7 1973), but we reversed, holding that the Eleventh Amendment barred the injunction ordering retroactive benefits because it was effectively an award of money damages for past [70]*70violations of federal law. Edelman v. Jordan, 451 U. S., at 666-669.
On remand, the District Court ordered the defendants to send notice to the plaintiff class informing individual class members that they were wrongfully denied benefits in a particular amount, together with a returnable form for filing claims with the appropriate state agency. The Court of Appeals reversed, holding that the District Court’s proposed notice violated the Eleventh Amendment because it would effectively result in a federal adjudication of state liability for past violations of federal law. Jordan v. Trainor, 563 F. 2d 873, 875 (CA7 1977) (en banc). At the same time, the Court of Appeals determined that the Eleventh Amendment would not bar an order requiring state officials to send “a mere explanatory notice to applicants advising them that there is a state administrative procedure available if they desire to have the state determine whether or not they may be eligible for past benefits.” Ibid.
We affirmed in Quern v. Jordan, 440 U. S. 332 (1979), holding that although Edelman v. Jordan, supra, retained continuing vitality after Monell v. New York City Dept. of Social Services, 436 U. S. 658 (1978), see 440 U. S., at 338-345, the specific notice order approved by the Court of Appeals did not violate the Eleventh Amendment. Id., at 346-349. We explained that the appellate court’s particular notice order fell “on the Ex parte Young side of the Eleventh Amendment line rather than on the Edelman side.” Id., at 347. We reasoned that “unlike [the notice] ordered by the District Court, [this notice was] more properly viewed as ancillary to the prospective relief already ordered by the court,” id., at 349, and it did no more than “simply infor[m] class members that their federal suit is at an end, that the federal court can provide them with no further relief, and that there are existing state administrative procedures which they may wish to pursue.” Ibid. We also stressed that the state defendants had not objected to the expense of providing [71]*71such notice, state agencies rather than federal courts would be the final arbiters of whether retroactive payments would be ordered, and the notice would not automatically lead to any particular action. Id., at 347-348.
Our review of the long, drawn-out Jordan litigation convinces us that neither the Court of Appeals nor this Court conceived of the requested notice allowed in that case to be an independent form of relief. We simply held that the specific order fell within the Ex parte Young exception to the Eleventh Amendment principle of sovereign immunity because it was ancillary to a valid injunction previously granted and was sufficiently narrow to retain its character as a mere case-management device. The notice in Quern v. Jordan did nothing other than inform a diverse and partially victorious class concerning the extent of the judgment in its favor, cf. Fed. Rule Civ. Proc. 23(d)(2), and that the federal courts could do no more for them. There was no suggestion that the notice itself would bind state officials in any way, or that such notice would be routinely available as a form of relief in other cases. Because “notice relief” is not the type of remedy designed to prevent ongoing violations of federal law, the Eleventh Amendment limitation on the Art. Ill power of federal courts prevents them from ordering it as an independent form of relief.
Measured by the standards of Quern, however, a request for a limited notice order will escape the Eleventh Amendment bar if the notice is ancillary to the grant of some other appropriate relief that can be “noticed.” Because there is no continuing violation of federal law to enjoin in this case, an injunction is not available. Therefore, notice cannot be justified as a mere case-management device that is ancillary to a judgment awarding valid prospective relief. Petitioners argue, however, that they are entitled to a declaratory judgment that respondent violated federal law in the past. Only if petitioners are correct in this assertion can they properly [72]*72nlaim a right to “notice” of a judgment under the principles of Quern.
The Declaratory Judgment Act of 1934, 28 U. S. C. § 2201, permits a federal court to declare the rights of a party whether or not further relief is or could be sought, and we have held that under this Act declaratory relief may be available even though an injunction is not. Steffel v. Thompson, 415 U. S. 452, 462 (1974). But we have also held that the declaratory judgment statute “is an enabling Act, which confers a discretion on the courts rather than an absolute right upon the litigant.” Public Service Comm’n v. Wycoff Co., 344 U. S. 237, 241 (1952). The propriety of issuing a declaratory judgment may depend upon equitable considerations, see Samuels v. Mackell, 401 U. S. 66, 73 (1971), and is also “informed by the teachings and experience concerning the functions and extent of federal judicial power.” Wycoff, supra, at 243; cf. Younger v. Harris, 401 U. S. 37, 44-45 (1971).
In applying these principles, we have held that a declaratory judgment is not available in a number of instances. In Great Lakes Co. v. Huffman, 319 U. S. 293 (1943), we held that a declaratory judgment was not available to obtain a determination of the constitutionality of a state tax even though the relevant federal statute prohibited federal courts only from issuing injunctions against the collection of such taxes. Id., at 299. We held in Samuels v. Mackell, supra, that a declaratory judgment declaring a state criminal statute unconstitutional was unavailable where it would have much the same effect as an injunction prohibiting enforcement of the statute, and the latter was barred by traditional principles of equity, comity, and federalism. Id., at 69-73. In Wycoff, we held that it was inappropriate to issue a declaratory judgment deciding whether the plaintiff’s business was interstate commerce and therefore potentially immune from state regulation. 344 U. S., at 244, 247-249. We reasoned that if the federal judgment were res judicata in subsequent [73]*73state proceedings, then the federal court will have lifted the case out of the state court before the state agency or court can hear it. Id., at 247. On the other hand, if the federal judgment would not have such an effect, then it would “serv[e] no useful purpose as a final determination of rights.” Ibid.
We think that these cases demonstrate the impropriety of the issuance of a declaratory judgment in this case. There is no claimed continuing violation of federal law, and therefore no occasion to issue an injunction. Nor can there be any threat of state officials violating the repealed law in the future. Cf. Steffel v. Thompson, supra, at 454. There is a dispute about the lawfulness of respondent’s past actions, but the Eleventh Amendment would prohibit the award of money damages or restitution if that dispute were resolved in favor of petitioners. We think that the award of a declaratory judgment in this situation would be useful in resolving the dispute over the past lawfulness of respondent’s action only if it might be offered in state-court proceedings as res judicata on the issue of liability, leaving to the state courts only a form of accounting proceeding whereby damages or restitution would be computed. But the issuance of a declaratory judgment in these circumstances would have much the same effect as a full-fledged award of damages or restitution by the federal court, the latter kinds of relief being of course prohibited by the Eleventh Amendment. The teachings of Huffman, Samuels, and Wycoff are that a declaratory judgment is not available when the result would be a partial “end run” around our decision in Edelman v. Jordan, 415 U. S. 651 (1974).2
[74]*74Justice Brennan’s dissent contends that because the injunction and declaratory judgment in Quern implied past violations of federal law, declaratory judgments expressly adjudicating the question of past violations are routinely available. We think he is mistaken. The District Court’s injunction and declaratory judgment against continuing and future violations of federal law in Quern implied that similar violations had occurred in the past because neither state nor federal policy had varied through the time of judgment. Here, by contrast, there are no present violations under the amended statute, and even if there were, an injunction against them would not imply that past practice violated the repealed federal law. Thus, a declaratory judgment that respondent violated federal law in the past would have to stand on its own feet as an appropriate exercise of federal jurisdiction in this case. This it cannot do for the reasons we have previously stated.
We hold that the District Court was correct in concluding that neither the “notice” proposed by petitioners nor a declaratory judgment should have issued in a case of this type. The judgment of the Court of Appeals is therefore
Affirmed.