delivered the opinion of the Court.

Califano v. Goldfarb, 430 U. S. 199 (1977), held that a gender-based classification in the spousal-benefit provisions of the Social Security Act violated the right to the equal protection of the laws guaranteed by the Due Process Clause *731 of the Fifth Amendment. In this case, the United States District Court for the Northern District of Alabama held that amendments to the Act, adopted in 1977 partly in response to our decision, unjustifiably revive the gender-based classification that was invalidated in Goldfarb and therefore also violate the Fifth Amendment. App. to Juris. Statement la-9a. The Secretary of Health and Human Services appealed directly to this Court. We noted probable jurisdiction under 28 U. S. C. § 1252, 460 U. S. 1036 (1983), and now reverse.

I

A

The Social Security Act (Act) provides spousal benefits for the wives, husbands, widows, and widowers of retired and disabled wage earners. 42 U. S. C. § 402 (1976 ed. and Supp. V). Prior to December 1977, benefits were payable only to those husbands or widowers who could demonstrate dependency on their wage-earning wives for one-half of their support. Wives and widows, on the other hand, were entitled to spousal benefits without any such showing of dependency on their husbands. See former 42 U. S. C. §§ 402(b), (c)(1)(C), and (f)(1)(D). In March 1977, Califano v. Goldfarb, supra, affirmed the judgment of a three-judge District Court which held that the gender-based dependency requirement for widowers violated the equal protection component of the Due Process Clause of the Fifth Amendment. 1 Subsequently, the Court summarily affirmed two District Court decisions invalidating the dependency requirement for husbands’ benefits. Califano v. Silbowitz, 430 U. S. 924 (1977); Jablon v. Califano, 430 U. S. 924 (1977).

Following these decisions, as part of a general reform of the Social Security system, Congress repealed the dependency requirement for widowers and husbands. Social Security *732 Amendments of 1977 (1977 Amendments), §§ 334(b)(1), (d)(1), Pub. L. 95-216, 91 Stat. 1544, 1545, 42 U. S. C. §§ 402(c)(1), (f)(1) (1976 ed., Supp. V). See S. Rep. No. 95-572, pp. 88, 93 (1977). 2 It concluded, however, that elimination of the dependency test, by increasing the number of individuals entitled to spousal benefits, could create a serious fiscal problem for the Social Security trust fund. See id., at 27-28. This problem was particularly acute with respect to the large number of retired federal and state employees who would now become eligible for spousal benefits. Unlike most applicants, who must offset any dual Social Security benefits against each other, 42 U. S. C. § 402(k)(3)(A), retired civil servants could, at the time of the 1977 Amendments, receive the full amount of both the spousal benefits and the government pensions to which they were entitled. Congress estimated that payment of unreduced spousal benefits to such individuals could cost the system an estimated $190 million in 1979. S. Rep. No. 95-572, supra, at 27-28.

To avoid this fiscal drain, Congress included as part of the 1977 Amendments a “pension offset” provision that generally requires the reduction of spousal benefits by the amount of certain Federal or State Government pensions received by the Social Security applicant. 1977 Amendments, §§334 (a)(2) and (b)(2), 42 U. S. C. §§ 402(b)(4)(A) and (c)(2)(A) (1976 ed., Supp. V). Congress estimated that 90 percent of the savings that would be achieved by the pension offset provision as proposed by the Senate would be attributable to a reduction in payments to nondependent husbands and widowers who had not been entitled to any spousal benefits prior to *733 the decision in Goldfarb. See S. Rep. No. 95-572, supra, at 81. The remaining portion of the savings, however, would come from a reduction in benefits to individuals, mostly women but also dependent men, who had retired or were about to retire and who had planned their retirements in reliance on their entitlement, under pre-1977 law, to spousal benefits unreduced by government pension benefits. See ibid.; H. R. Conf. Rep. No. 95-837, p. 72 (1977); S. Conf. Rep. No. 95-612, p. 72 (1977). In order to protect the reliance interests of this group, see infra, at 742, Congress exempted from the pension offset requirement as ultimately enacted those spouses who were eligible to receive pension benefits prior to December 1982 and who would have qualified for unreduced spousal benefits under the Act “as it was in effect and being administered in January 1977.” 1977 Amendments, § 334(g)(1), note following 42 U. S. C. §402 (1976 ed., Supp. V). 3

*734 In the same subsection in which it established this 5-year grace period for individuals who qualified for spousal benefits in January 1977, Congress also included a severability clause, which provides:

“If any provision of this subsection, or the application thereof to any person or circumstance, is held invalid, the remainder of this section shall not be affected thereby, but the application of this subsection to any other persons or circumstances shall also be considered invalid.” 1977 Amendments, § 334(g)(3), note following 42 U. S. C. §402 (1976 ed., Supp. V).

The Conference Committee explained that the severability clause was enacted “so that if [the exception to the pension offset provision] is found invalid the pension-offset. . . would not be affected, and the application of the exception clause would not be broadened to include persons or circumstances that are not included within it.” H. R. Conf. Rep. No. 95-837, pp. 71-72 (1977); S. Conf. Rep. No. 95-612, pp. 71-72 (1977).

B

Appellee Robert H. Mathews (hereafter Mathews or appel-lee) retired from his job with the United States Postal Service on November 18, 1977. His wife, who had retired from her job a few months earlier, was fully insured under the *735 Social Security Act. In December 1977, Mathews applied for husband’s benefits on his wife’s account. On review of the application, the Social Security Administration (SSA) informed Mathews that he was entitled to spousal benefits of $153.30 per month but that, because, as appellee acknowledged, he was not dependent upon his wife for one-half of his support, this amount would be entirely offset by his $573 per month Postal Service pension in accordance with § 334(b)(2) of the 1977 Amendments, 42 U. S. C. § 402(c)(2) (1976 ed., Supp. V). App. to Juris. Statement 2a. After a hearing, an Administrative Law Judge (ALJ) affirmed the SSA’s initial decision. Id., at 16a-22a. The ALJ’s decision was in turn affirmed by the Appeals Council of the Department of Health and Human Services and thereby became the final decision of the Secretary. Id., at 13a-14a.

Mathews and his wife then brought this class action against the Secretary in the United States District Court for the Northern District of Alabama under § 205(g) of the Act, 42 U. S. C. 405(g). The complaint alleged that application of the pension offset provision of the 1977 Amendments to Mathews and other nondependent men but not to similarly situated nondependent women violated the Due Process Clause of the Fifth Amendment and sought a declaratory judgment to that effect. Appellee also contended that the severability clause of the 1977 Amendments was unconstitutional. The District Court certified a nationwide class composed of “all applicants for husband’s insurance benefits . . . whose applications . . . have been denied [beginning 60 days before the filing of the complaint] solely because of the statutory requirement that husbands must have received more than one-half of their support from their wives in order to be entitled to benefits.” App. to Juris. Statement 10a.

Shortly thereafter, the District Court filed an opinion, id., at la-9a, and order, id., at 27a-28a, holding both the pension offset exception of § 334(g)(1)(B) and the severability clause of § 334(g)(3) unconstitutional. The court noted that, in es *736 sence, the exception to the pension offset “provides a five-year grace period for all women who retire within five years of the enactment, and for men who retire within five years of the enactment and who are economically dependent upon their wives.” Id., at 3a. In light of this gender-based classification, the court noted that the offset exception could be upheld only if it “‘serve[s] important governmental objectives and [is] substantially related to achievement of those objectives.’” Id., at 4a, quoting Craig v. Boren, 429 U. S. 190, 197 (1976). The court decided that the exception could not be justified as protecting the reliance interests of individuals who had planned their retirements prior to the 1977 Amendments in expectation of undiminished benefits because, by requiring men to prove dependency notwithstanding the decision in Goldfarb, the offset exception presumes that “women would have relied upon the practices of the Social Security Administration, yet men would not have relied upon a decision of the Supreme Court.” App. to Juris. Statement 5a. Accordingly, the court held that the “portion of the exception to the pension offset provision that requires a male applicant to prove that he received one-half of his economic support from his wife violates the equal protection guarantees of the due process clause of the fifth amendment.” Id., at 6a-7a (footnote omitted).

Having invalidated the exception to the offset provision, the District Court considered the severability clause of § 334(g)(3). The court noted that, in the event appellee obtained a judgment that the offset exception unconstitutionally discriminates against him, the clause, if valid, would require nullification of the exception as to all persons, rather than extension of the exception to persons like appellee. Consequently, all government retirees not covered by Social Security, without regard to gender or dependency, would have their spousal benefits offset by the amount of their government pensions. The court characterized this effect of the severability clause as an effort by Congress “to mandate the *737 outcome of any challenge to the validity of the [pension offset] exception by making such a challenge fruitless. Even if a plaintiff achieved success in having the gender-based classification stricken, he would derive no personal benefit from the decision, because the pension offset would be applied to all applicants without exception.” Id., at 8a. Because of its view that Congress could not have meant to defeat the reliance interests of government retirees in that way, the court concluded “that the severability clause is not an expression of the true Congressional intent, but instead is an adroit attempt to discourage the bringing of an action by destroying standing.” Ibid. Accordingly, the court held the severability provision unconstitutional and ordered the Secretary to pay Mathews and the rest of the plaintiff class full spousal benefits without regard to dependency and without offsetting the amount of their government pensions. Id., at 9a.

II

Because it may affect our jurisdiction, see Linda R. S. v. Richard D., 410 U. S. 614, 616 (1973), we consider first the District Court’s conclusion that the severability provision of the 1977 Amendments would, if valid, deprive appellee of standing to bring this action by preventing him from receiving any more spousal benefits if he prevails than he is now allowed. Appellee agrees with the District Court’s analysis and, for that reason, contends that the severability clause amounts to an unconstitutional attempt by Congress to thwart the jurisdiction and remedial power of the federal courts. We agree with the Secretary, however, that because the right asserted by appellee is the right to receive “benefits . . . distributed according to classifications which do not without sufficient justification differentiate among covered [applicants] solely on the basis of sex,” Weinberger v. Wiesenfeld, 420 U. S. 636, 647 (1975), and not a substantive right to any particular amount of benefits, appellee’s standing does not depend on his ability to obtain increased Social Security payments.

*738 In order to establish standing for purposes of the constitutional “case or controvery” requirement, a plaintiff “must show that he personally has suffered some actual or threatened injury as a result of the putatively illegal conduct of the defendant,” Gladstone, Realtors v. Village of Bellwood, 441 U. S. 91, 99 (1979), and that the injury “is likely to be redressed by a favorable decision,” Simon v. Eastern Kentucky Welfare Rights Organization, 426 U. S. 26, 38 (1976). In this case, appellee claims a type of personal injury we have long recognized as judicially cognizable. 4 He alleges that the pension offset exception subjects him to unequal treatment in the provision of his Social Security benefits solely because of his gender; specifically, as a nondependent man, he receives fewer benefits than he would if he were a similarly situated woman. App. 6.

Although the severability clause would prevent a court from redressing this inequality by increasing the benefits payable to appellee, we have never suggested that the injuries caused by a constitutionally underinclusive scheme can be remedied only by extending the program’s benefits to the excluded class. To the contrary, we have noted that a court sustaining such a claim faces “two remedial alternatives: [it] may either declare [the statute] a nullity and order that its benefits not extend to the class that the legislature intended to benefit, or it may extend the coverage of the statute to include those who are aggrieved by the exclusion.” Welsh v. United States, 398 U. S. 333, 361 (1970) (Harlan, J., concurring in result). See Califano v. Westcott, 443 U. S. 76, *739 89-91 (1979). 5 For that reason, we have frequently entertained attacks on discriminatory statutes or practices even when the government could deprive a successful plaintiff of any monetary relief by withdrawing the statute’s benefits from both the favored and the excluded class. 6

These decisions demonstrate that, like the right to procedural due process, see Carey v. Piphus, 435 U. S. 247, 266 (1978), the right to equal treatment guaranteed by the Constitution is not coextensive with any substantive rights to the benefits denied the party discriminated against. Rather, as we have repeatedly emphasized, discrimination itself, by perpetuating “archaic and stereotypic notions” or by stigmatizing members of the disfavored group as “innately inferior” and therefore as less worthy participants in the political community, Mississippi University for Women v. Hogan, 458 U. S. 718, 725 (1982), can cause serious noneconomic injuries *740 to those persons who are personally denied equal treatment solely because of their membership in a disfavored group. 7 Accordingly, as Justice Brandéis explained, when the “right invoked is that to equal treatment,” the appropriate remedy is a mandate of equal treatment, a result that can be accomplished by withdrawal of benefits from the favored class as well as by extension of benefits to the excluded class. Iowa-Des Moines National Bank v. Bennett, 284 U. S. 239, 247 (1931). 8 Because the severability clause would forbid only the latter and not the former kind of relief in this case, the injury caused by the unequal treatment allegedly suffered by appellee may “be redressed by a favorable decision,” Simon v. Eastern Kentucky Welfare Rights Organization, supra, at 38, and he therefore has standing to prosecute this action. 9

*741 HH I — I f — 1

Although appellee prevailed in the District Court on his constitutional claim, he urges as an alternative ground for affirmance that we construe the pension offset exception so that it does not incorporate a gender-based classification of the kind invalidated in Califano v. Goldfarb, 430 U. S. 199 (1977), but instead exempts from the offset requirement both men and women, without regard to dependency. Relying on “the maxim that statutes should be construed to avoid constitutional questions,” United States v. Batchelder, 442 U. S. 114, 122 (1979), he contends that Congress, in reviving the qualifying criteria in effect before the decision in Goldfarb, must be presumed to have done so without reenacting the gender-based dependency test which this Court had held unconstitutional.

The canon favoring constructions of statutes to avoid constitutional questions does not, however, license a court to usurp the policymaking and legislative functions of duly elected representatives. Yu Cong Eng v. Trinidad, 271 U. S. 500, 518 (1926). See NLRB v. Catholic Bishop of Chicago, 440 U. S. 490, 499-501 (1979); id., at 508-511 (Brennan, J., dissenting); United States v. Sullivan, 332 U. S. 689, 693 (1948). “‘[Although this Court will often strain to construe legislation so as to save it against constitutional attack, it must not and will not carry this to the point of *742 perverting the purpose of a statute . . .’or judicially rewriting it.” Aptheker v. Secretary of State, 378 U. S. 500, 515 (1964), quoting Scales v. United States, 367 U. S. 203, 211 (1961). In this case, the language and history of the offset exception plainly demonstrate that Congress meant to resurrect, for a 5-year grace period, the gender-based dependency test of pre-Goldfarb law.

As we have noted, supra, at 731-733, Congress adopted the pension offset requirement to prevent the serious fiscal drain that it concluded would result from payment of unreduced benefits to the new class of recipients made eligible by the decision in Goldfarb. Nevertheless, in an effort to protect the reliance interests of individuals who had planned their retirement before the March 1977 Goldfarb decision and the resulting amendments to the Act, see H. R. Conf. Rep. No. 95-837, p. 72 (1977); S. Conf. Rep. No. 95-612, p. 72 (1977), Congress exempted from the offset requirement those individuals eligible for spousal benefits under the Act “as it was in effect and being administered in January 1977.” There can be no dispute that in January 1977 men were eligible for benefits only upon a showing of dependency whereas women were subject to no such requirement. See former 42 U. S. C. §§ 402(c) and (f); Califano v. Goldfarb, supra, at 201-202, and nn. 1, 2. 10 And Congress further indicated its intent to revive those eligibility criteria by including an un *743 usual severability clause that would, in the event the classification were held invalid, sacrifice the exception’s protection of reliance interests to the goal served by the offset provision itself — preventing an undue financial burden on the system. See supra, at 734, and n. 5; H. R. Conf. Rep. No. 95-837, supra, at 72; S. Conf. Rep. No. 95-612, supra, at 72.

Consistent with the plain import of these provisions, Senator Long, then Chairman of the Senate Finance Committee and principal manager of the bill in the Senate, explained that the exception clause was meant “to afford . . . protection to those who anticipated receiving their spouses benefits prior to March 1977 without providing it also to those [who] would qualify only as a result of [the Goldfarb] decision.” 123 Cong. Rec. 39134 (1977) (emphasis added). See also id., at 39008 (remarks of Rep. Ullman). Appellee’s proposed interpretation of the exception provision would defeat this clearly expressed intention and, by rendering the offset requirement applicable to very few applicants, 11 frustrate the congres *744 sional aim of preventing a major fiscal drain on the Social Security trust fund. Accordingly, we reject appellee’s construction of the Act and conclude that the exception to the offset provision applies to otherwise eligible men only when they can show dependency on their wives for one-half of their support. We turn therefore to consider the constitutionality of that gender-based classification.

HH <

We recently reviewed the “firmly established principles by which to evaluate a claim of gender discrimination like that made by appellee:

“Our decisions . . . establish that the party seeking to uphold a statute that classifies individuals on the basis of their gender must carry the burden of showing an ‘exceedingly persuasive justification’ for the classification. . . . The burden is met only by showing at least that the classification serves ‘important governmental objectives and that the discriminatory means employed’ are ‘substantially related to the achievement of those objectives.’. . .

“Although the test for determining the validity of a gender-based classification is straightforward, it must be applied free of fixed notions concerning the roles and abilities of males and females. Care must be taken in ascertaining whether the statutory objective itself reflects archaic and stereotypic notions. Thus, if the statutory objective is to exclude or ‘protect’ members of one gender because they are presumed to suffer from an inherent handicap or to be innately inferior, the objective itself is illegitimate. . . .

“If the State’s objective is legitimate and important, we next determine whether the requisite direct, substantial relationship between objective and means is present.” Mississippi University for Women v. Hogan, 458 U. S., at 724-725. (Citations and footnotes omitted.)

*745 We therefore consider in turn whether the Secretary has carried her burden of (A) showing a legitimate and “exceedingly persuasive justification” for the gender-based classification of the pension offset provision and (B) demonstrating “the requisite direct, substantial relationship” between the classification and the important governmental objectives it purports to serve.

A

Although the offset exception temporarily revives the gender-based eligibility requirements invalidated in Gold-farb, Congress’ purpose in adopting the exception bears no relationship to the concerns that animated the original enactment of those criteria. The Court concluded in Goldfarb that the original gender-based standards, which were premised on an assumption that females would normally be dependent on the earnings of their spouses but males would not, constituted an “accidental byproduct of a traditional way of thinking about females,” 430 U. S., at 223 (Stevens, J., concurring in judgment), that reflected “‘old notions’ and ‘archaic and overbroad’ generalizations” about the roles and relative abilities of men and women, id., at 211,217 (plurality opinion). Accordingly, the statute’s “objective itself [was] illegitimate.” Mississippi University for Women v. Hogan, supra, at 725. 12

The provision at issue here, in contrast, reflects no such illegitimate government purposes. As detailed above, Congress adopted the offset exception in order to protect the expectations of persons, both men and women, who had planned their retirements based on pre-January 1977 law, under which they could receive spousal benefits unreduced by the amount of any government pensions to which they were also entitled. Congress accomplished its aim by incor *746 porating the eligibility criteria as they existed in January 1977; its choice of this approach rather than an explicit adoption of new gender-based standards confirms that its purpose was to protect reliance on prior law, not to reassert the sexist assumptions rejected in Goldfarb.

Nor is that purpose rendered illegitimate by the fact that it is achieved through a temporary revival of an invalidated classification. We have recognized, in a number of contexts, the legitimacy of protecting reasonable reliance on prior law even when that requires allowing an unconstitutional statute to remain in effect for a limited period of time. See, e. g., Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U. S. 50, 87-89 (1982) (plurality opinion); Buckley v. Valeo, 424 U. S. 1, 142-143 (1976) (per curiam); Chevron Oil Co. v. Huson, 404 U. S. 97, 106-107 (1971). See also Los Angeles Dept. of Water & Power v. Manhart, 435 U. S. 702, 718-723 (1978). Although an unconstitutional scheme could not be retained for an unduly prolonged period in the name of protecting reliance interests, or even for a brief period if the expectations sought to be protected were themselves unreasonable or illegitimate, there is no indication that the offset exception suffers from either of these flaws. The duration of the exception is closely related to its goal of protecting only individuals who had planned their retirements in reliance on prior law, see infra, at 748-749, and appellee does not suggest that the expectations of those individuals, who hardly could have anticipated the adoption of the offset requirement, were unreasonable or illegitimate.

The protection of reasonable reliance interests is not only a legitimate governmental objective: it provides “an exceedingly persuasive justification” for the statute at issue here. See Kirchberg v. Feenstra, 450 U. S. 455, 461 (1981); Personnel Administrator of Mass. v. Feeney, 442 U. S. 256, 273 (1979). Appellee does not, and cannot, contest the Secretary’s statement that “it is a significant and salutary goal to secure the retirement plans of our Nation’s workers who in *747 good faith had long and reasonably relied on the provisions of the Social Security Act.” Brief for Appellant 33. Instead, appellee contends that the only people who could justifiably have relied on an expectation of unreduced benefits are those who actually retired before the effective date of the offset provision and those individuals will not be required to offset their benefits. Brief for Appellees 28-29, and n. 21, 31-32. Congress determined, however, that many individuals adjusted their spending and savings habits prior to their retirements in expectation of receiving full spousal benefits as well as a government pension, 13 and we have no reason to doubt that conclusion. One commentator has explained:

“Many couples have undoubtedly made retirement plans and adjusted the level of their private saving and investment in anticipation of retirement benefits from social security which include a special benefit for a spouse. An abrupt denial of benefits in these cases, even if the spouse who would have received them is shown to be not truly dependent on the other is clearly inequitable since the couple’s savings and retirement plans would have *748 been different had the spouse benefit not been anticipated. Thus, were it to be decided that wives should prove dependency in order to receive spouse benefits, a strong argument could be made for making such a change gradually so as to avoid inequities to couples approaching retirement who had anticipated that such benefits would be available to them and had made their retirement plans accordingly.” M. Flowers, Women and Social Security: An Institutional Dilemma 41 (1977).

In short, particularly in the years immediately preceding retirement, individuals make spending, savings, and investment decisions based on assumptions regarding the amount of income they expect to receive after they stop working. For such individuals reliance on the law in effect during those years may be critically important. 14 In recognition of this fact, the offset exception, in the words of the Conference Report, protects “people who are already retired, or close to retirement, from public employment and who cannot be expected to readjust their retirement plans to take account of the ‘offset’ provision that will apply in the future.” H. R. Conf. Rep. No. 95-837, p. 72 (1977); S. Conf. Rep. No. 95-612, p. 72 (1977). That purpose, consistent with the principle that “ ‘[gjreat nations, like great men, should keep their word,’” Astrup v. INS, 402 U. S. 509, 514, n. 4 (1971), quoting FTC v. Tuscarora Indian Nation, 362 U. S. 99, 142 (1960) (Black, J., dissenting), provides an exceedingly persuasive justification for the gender-based classification incorporated in the offset exception.

B

Having identified the legitimate and important governmental purpose of the offset exception, we have little trouble *749 concluding that the means employed by the statute is “substantially related to the achievement of [that] objectiv[e].” Wengler v. Druggists Mutual Insurance Co., 446 U. S. 142, 150 (1980). By reviving for a 5-year period the eligibility criteria in effect in January 1977, the exception is narrowly tailored to protect only those individuals who made retirement plans prior to the changes in the law that occurred after that date. Individuals who were eligible for spousal benefits before the law changed and who retire within five years of the statute’s enactment may reasonably be assumed to have begun planning for their retirement prior to the adoption of the offset provision. See supra, at 747-748. Such persons, men as well as women, may receive spousal benefits unreduced by their government pensions, while those persons, men as well as women, who first became eligible for benefits after January 1977 may not. 15

*750 Moreover, the offset exception was plainly adopted “through reasoned analysis rather than through the mechanical application of traditional, often inaccurate, assumptions about the proper roles of men and women.” Mississippi University for Women v. Hogan, 458 U. S., at 726 (footnote omitted). As the legislative history set out above demonstrates, Congress considered carefully and at length both the financial problems that led to the offset provision and the reliance interests that might be frustrated by that requirement. The solution finally adopted, after rejection of more expensive or impractical alternatives, 16 distinguishes Social Security applicants, not according to archaic generalizations about the roles and abilities of men and women, but rather according to whether they planned their retirements with the expectation, created by the law in effect in January 1977, that they would receive both full spousal benefits and a government pension.

V

The exception to the pension offset requirement set out in § 334(g)(1) of the 1977 Amendments to the Social Security Act, while temporarily reviving the gender-based classifica *751 tion invalidated in Califano v. Goldfarb, is directly and substantially related to the important governmental interest of protecting individuals who planned their retirements in reasonable reliance on the law in effect prior to that decision. Accordingly, the judgment of the District Court is

Reversed.