Justice O'CONNOR announced the judgment of the Court, and delivered an opinion in which THE CHIEF JUSTICE, Justice WHITE, and Justice KENNEDY join.
In this case, we decide whether our decision in American Trucking Assns, Inc. v. Scheiner, 483 U. S. 266 (1987), applies retroactively to taxation of highway use prior to the date of that decision.
I
In 1983, petitioners brought suit in the Chancery Court of Pulaski County, Arkansas, challenging the constitutionality of the newly enacted Arkansas Highway Use Equalization Tax Act (HUE), 1983 Ark.Gen. Acts, No. 685, Ark.Code Ann. §§ 27-35204, 27-35-205 (1987) (formerly codified as Ark.Stat.Ann. §§ 75-817.2, 75-817.3 (Supp. 1985)), under the Commerce Clause of the Federal Constitution. Art. I, § 8, cl. 3. The HUE tax required trucks operating on Arkansas highways with a gross weight between 73,281 and 80,000 pounds to pay either an annual flat tax of $175 or a tax of 5c per mile traveled in Arkansas or a trip permit fee of $8 per 100 miles. Effectively, HUE taxed only the first 3,500 miles of annual highway use by heavy trucks, that being the point at which it became advantageous to pay the flat tax of $175. Because trucks based in Arkansas were likely to travel many more miles on the State's highways than heavy trucks based out of the State, petitioners argued that HUE impermissibly discriminated against interstate commerce by imposing on out-of-state truckers greater per-mile costs than those imposed on in-state truckers. To remedy the alleged federal constitutional violation, petitioners argued that Art. 16, § 13 of the Arkansas Constitution required the State to refund all HUE taxes petitioners had paid. See App. 12-13, 22-23 (filed Mar. 6, 1989).
Pending determination on the merits of their constitutional challenge, petitioners sought a preliminary injunction placing all HUE tax revenues in escrow to prevent those revenues from being deposited into the state treasury and being distributed to state agencies. The Chancery Court's denial of petitioners' motion for the preliminary injunction was affirmed on interlocutory appeal to the Arkansas Supreme Court. American Trucking Assns., Inc. v. Gray, 280 Ark. 258, 657 S.W.2d 207 (1983). After further proceedings, the Chancery Court upheld the constitutionality of HUE and the State Supreme Court affirmed. American Trucking Assns., Inc. v. Gray, 288 Ark. 488, 707 S.W.2d 759 (1986). That court relied on our decisions in Capitol Greyhound Lines v. Brice, 339 U. S. 542 (1950), Aero Mayflower Transit Co. v. Board of Railroad Comm'rs of Montana, 332 U. S. 495 (1947), and Aero Mayflower Transit Co. v. Georgia Public Service Comm'n, 295 U. S. 285 (1935), to hold that the flat tax portion of HUE was neither excessive nor unreasonable and did not, therefore, violate the Commerce Clause. In so doing, the Arkansas Supreme Court explicitly rejected petitioners' argument that our decision in Complete Auto Transit, Inc. v. Brady, 430 U. S. 274 (1977), had overruled the Aero Mayflower line of cases.
Petitioners appealed the Arkansas Supreme Court decision to this Court and we held the case pending our decision in Scheiner, which involved a similar constitutional challenge to two flat highway use taxes enacted by the Commonwealth of Pennsylvania. In Scheiner, decided June 23, 1987, the Court held that unapportioned flat taxes such as those imposed by Pennsylvania penalize travel within a free trade area among the States. The Court applied the "internal consistency" test, see Armco, Inc. v. Hardesty, 467 U. S. 638, 467 U. S. 644 (1984), and concluded that
[i]f each State imposed flat taxes for the privilege of making commercial entrances into its territory, there is no conceivable doubt that commerce among the States would be deterred.
483 U.S. at 483 U. S. 284. We recognized in Scheiner that Arkansas, appearing as amicus curiae in that case, was one of a number of States that had enacted flat highway use taxes. See id. at 483 U. S. 285, n. 17; id. at 483 U. S. 300 -301 (dissenting opinion). Accordingly, three days after deciding Scheiner, we vacated the judgment of the Arkansas Supreme Court in Gray and remanded that case for further consideration in light of Scheiner. American Trucking Assns., Inc. v. Gray, 483 U.S. 1014 (1987). On motion by petitioners, who sought to expedite their efforts in the state courts to obtain injunctive relief against further enforcement of the HUE tax, and pursuant to this Court's former Rule 52.2, Justice BLACKMUN shortened the time of issuance of our mandate to the Arkansas Supreme Court and ordered that the mandate issue on July 16, 1987.
Petitioners thereupon sought to enjoin further collection of the HUE tax or to order an escrow of the taxes to be collected pending reconsideration of Gray by the Arkansas Supreme Court. Motions seeking to accomplish this end were denied by that court, and petitioners returned here. In an opinion issued August 14, 1987, Justice BLACKMUN, acting as Circuit Justice, concluded there was a significant possibility that the Arkansas Supreme Court would find the HUE tax unconstitutional under Scheiner or, failing that, that this Court would note probable jurisdiction and strike down the HUE tax. American Trucking Assns., Inc. v. Gray, 483 U. S. 1306, 483 U. S. 1309 (1987) (in chambers). He further concluded that, because "there is a substantial risk that [petitioners] will not be able to obtain a refund if the [HUE] tax ultimately is declared unconstitutional," ibid., petitioners would suffer "irreparable injury absent injunctive relief." Ibid. Justice BLACKMUN therefore ordered Arkansas to "escrow the HUE taxes to be collected, until a final decision on the merits in this case is reached." Id. at 483 U. S. 1310.
On October 9, 1987, the Arkansas Legislature met in special session, repealed the HUE tax, and replaced it with a tax requiring heavy trucks to pay 2.5 cents per mile of travel on Arkansas highways. See Ark. Code Ann. §§ 27-35-204, 27-35-205 (Supp. 1987). Subsequently, in an opinion delivered on March 14, 1988, the Arkansas Supreme Court reconsidered the HUE tax in light of Scheiner and ruled it unconstitutional. American Trucking Assns., Inc. v. Gray, 295 Ark. 43, 746 S.W.2d 377. The court, however, declined to order tax refunds to petitioners for all HUE taxes paid prior to Justice BLACKMUN's August 14, 1987, escrow order. The Arkansas Supreme Court reasoned that petitioners would be entitled to refunds of all their HUE tax payments only if that court were to apply our Scheiner decision retroactively. In order to determine whether it would so treat Scheiner, the State Supreme Court applied the three-factor test we enunciated in Chevron Oil Co. v. Huson, 404 U. S. 97 (1971).
First, the Arkansas court ruled that Scheiner established a new rule of law with respect to flat highway use taxes by overruling the Aero Mayflower line of cases. The Arkansas court concluded that it reasonably relied on those cases in originally upholding the HUE tax against petitioners' Commerce Clause challenge. Second, the court held that prospective application of Scheiner would effectuate the purpose of the Commerce Clause "to secure equal treatment for interand intrastate commerce and thus create an area of free trade among the states." 295 Ark. at 46, 746 S.W.2d at 379. In this regard, the Arkansas Supreme Court relied heavily on the decision of the Washington Supreme Court denying tax refunds because of its determination that our decision in Tyler Pipe Industries, Inc. v. Washington State Dept. of Revenue, 483 U. S. 232 (1987), should not be applied retroactively. See National Can Corp. v. Department of Revenue, 109 Wash.2d 878, 888, 749 P.2d 1286, 1291 (1988) (en banc) ("It is difficult to understand how retroactive application would encourage free trade among the states, since whatever chill was imposed on interstate trade is in the past"), app. dism'd, 486 U.S. 1040 (1988). Third, the Arkansas Supreme Court held that it would be inequitable to order a total refund of HUE taxes already paid by petitioners into the state treasury. The court reasoned that, because petitioners had driven their heavy trucks on Arkansas highways, a total refund would
allow them an unconscionable windfall far in excess of a fair recovery for the discrimination they may have suffered due to the tax. It would constitute unfair treatment of the Arkansas-based truckers who have paid the tax and seek no refund.
295 Ark. at 47, 746 S.W.2d at 379. The Arkansas court determined, however, that HUE tax money paid into escrow after Justice BLACKMUN's August 14, 1987, order should be refunded to petitioners, as that money, having not been placed into the state treasury, had not been spent or budgeted for future expenditure. Justice Hickman dissented, believing that petitioners were entitled to refunds from the date Scheiner was decided "or certainly no later than when we were asked, in July 1987, to place the funds in escrow." 295 Ark. at 47, 746 S.W.2d at 379. On petition for rehearing, petitioners modified their remedial request and urged the Arkansas court to refund HUE taxes paid in excess of taxes petitioners would have paid had they been based in the State. The petition for rehearing was denied.
Petitioners thereupon sought a writ of certiorari from this Court. They presented the questions whether Scheiner should be applied retroactively and whether, even if the Scheiner decision is not retroactive, they are still entitled to refunds for taxes paid before we decided Scheiner for the tax year that began after the Scheiner decision or to refunds for taxes paid after the Scheiner decision but before Justice BLACKMUN's escrow order. We granted the petition for certiorari, 488 U.S. 954 (1988), and consolidated the case with No. 88-192, McKesson Corp. v. Division of Alcoholic Beverages and Tobacco, Dept. of Business Regulation of Fla., which we also decide today. See ante, p. 496 U. S. 18. We now affirm in part, reverse in part, and remand for further consideration.
II
When we have held state taxes unconstitutional in the past, it has been our practice to abstain from deciding the remedial effects of such a holding. While the relief provided by the State must be in accord with federal constitutional requirements, see McKesson, ante, at 496 U. S. 36 -43, 496 U. S. 51 -52, we have entrusted state courts with the initial duty of determining appropriate relief. See, e.g., Scheiner, 483 U.S. at 483 U. S. 297 -298; Tyler Pipe, supra, 483 U.S. at 483 U. S. 251 -253; Williams v. Vermont, 472 U. S. 14, 472 U. S. 28 (1985); Bacchus Imports, Ltd. v. Dias, 468 U. S. 263, 468 U. S. 276 -277 (1984); Exxon Corp. v. Eagerton, 462 U. S. 176, 462 U. S. 196 -197 (1983). Our reasons for doing so have arisen from a perception based in considerations of federal-state comity:
[T]his Court should not take it upon itself in this complex area of state tax structures to determine how to apply its holding: These refund issues, which are essentially issues of remedy for the imposition of a tax that unconstitutionally discriminated against interstate commerce, were not addressed by the state courts. Also, the federal constitutional issues involved may well be intertwined with, or their consideration obviated by, issues of state law. Also, resolution of those issues, if required at all, may necessitate more of a record than so far has been made in this case. We are reluctant, therefore, to address them in the first instance.
Tyler Pipe, supra, 483 U.S. at 483 U. S. 252, quoting Bacchus, supra, 468 U.S. at 468 U. S. 277.
In a case such as this, where a state court has addressed the refund issues, the same comity-based perception that has dictated abstention in the first instance requires that we carefully disentangle issues of federal law from those of state law and refrain from deciding anything apart from questions of federal law directly presented to us. By these means, we avoid interpreting state laws with which we are generally unfamiliar and deciding additional questions of federal law unnecessarily. Cf. Michigan v. Long, 463 U. S. 1032, 463 U. S. 1039 -1042 (1983). In the present case, it is eminently clear that the "state court decision fairly appears to rest primarily on federal law, or to be interwoven with the federal law…." Id. at 463 U. S. 1040. Specifically, the Arkansas Supreme Court took the view that, whatever else Arkansas law might require, petitioners could not receive tax refunds if Scheiner is not retroactive under the test of Chevron Oil.
The determination whether a constitutional decision of this Court is retroactive -that is, whether the decision applies to conduct or events that occurred before the date of the decision -is a matter of federal law. When questions of state law are at issue, state courts generally have the authority to determine the retroactivity of their own decisions. See Great Northern R. Co. v. Sunburst Oil & Refining Co., 287 U. S. 358, 287 U. S. 364 (1932) ("We think the federal constitution has no voice upon the subject [of whether a state court may decline to give its decisions retroactive effect]"). The retroactive applicability of a constitutional decision of this Court, however, "is every bit as much of a federal question as what particular federal constitutional provisions themselves mean, what they guarantee, and whether they have been denied." Chapman v. California, 386 U. S. 18, 386 U. S. 21 (1967). In order to ensure the uniform application of decisions construing constitutional requirements and to prevent States from denying or curtailing federally protected rights, we have consistently required that state courts adhere to our retroactivity decisions. See, e.g., Michigan v. Payne, 412 U. S. 47 (1973) (holding that the state court erred in applying North Carolina v. Pearce, 395 U. S. 711 (1969), retroactively to invalidate a resentencing proceeding occurring prior to the date of the decision in Pearce ); Arsenault v. Massachusetts, 393 U. S. 5 (1968) (holding that the state court erred in determining that White v. Maryland, 373 U. S. 59 (1963), requiring an accused to be represented by counsel during a preliminary hearing, did not apply retroactively to petitioner).
Although the Court has recently determined that new rules of criminal procedure must be applied retroactively to all cases pending on direct review or not yet final, see Griffith v. Kentucky, 479 U. S. 314, 479 U. S. 328 (1987), retroactivity of decisions in the civil context "continues to be governed by the standard announced in [ Chevron Oil ]," id. at 479 U. S. 322, n. 8; see also United States v. Johnson, 457 U. S. 537, 457 U. S. 550, n. 12 (1982). In this case, the Arkansas Supreme Court decided that, under Chevron Oil, our decision in Scheiner need only apply prospectively. This decision presents a federal question: Did the Arkansas Supreme Court apply Chevron Oil correctly? As petitioners properly observed at oral argument, this is the only question before the Court in this case. Tr. of Oral Arg. 7-10.
It is important to distinguish the question of retroactivity at issue in this case from the distinct remedial question at issue in McKesson, ante p. 496 U. S. 18. When taxpayers involuntarily pay a tax that is unconstitutional under existing precedents, to what relief are those affected taxpayers entitled as a matter of federal law? Our decision in McKesson indicates that federal law sets certain minimum requirements that States must meet but may exceed in providing appropriate relief. Because we decide that, in certain respects, the Arkansas Supreme Court misapplied Chevron Oil and, therefore, that our decision in Scheiner applies to some taxation of highway use pursuant to the HUE tax, we must remand this case to the Arkansas Supreme Court to determine appropriate relief in light of McKesson.
A
Using the Chevron Oil test, we consider first the application of Scheiner to taxation of highway use prior to June 23, 1987, the date we decided Scheiner, for the HUE tax year ending June 30, 1987. That test has three parts:
First, the decision to be applied nonretroactively must establish a new principle of law, either by overruling clear past precedent on which litigants may have relied or by deciding an issue of first impression whose resolution was not clearly foreshadowed. Second,… we must… weigh the merits and demerits in each case by looking to the prior history of the rule in question, its purpose and effect, and whether retrospective operation will further or retard its operation. Finally, we [must] weig[h] the inequity imposed by retroactive application, for where a decision of this Court could produce substantial inequitable results if applied retroactively, there is ample basis in our cases for avoiding the injustice or hardship by a holding of nonretroactivity.
404 U.S. at 404 U. S. 106 -107 (citations and internal quotations omitted).
We think it obvious that Scheiner meets the first test of nonretroactivity. Both the majority and dissent in that case recognized that the Court's decision left very little of the Aero Mayflower line of precedents standing. As the majority observed,
the precedents upholding flat taxes can no longer support the broad proposition… that every flat tax for the privilege of using a State's highways must be upheld even if it has a clearly discriminatory effect on commerce by reason of that commerce's interstate character.
483 U.S. at 483 U. S. 296. These precedents retain vitality only when flat taxes "are the only practicable means of collecting revenues from users," ibid. -a situation no more present in Arkansas than it was in Pennsylvania. See also id. at 483 U. S. 298 (dissenting opinion) ("[T]he Court today directly overrules the holdings of" the Aero Mayflower precedents); id. at 483 U. S. 304 (SCALIA, J., dissenting). That the Court in Scheiner recognized that Complete Auto Transit "called into question the future vitality of earlier cases that had upheld facially neutral flat taxes," id. at 483 U. S. 295, does not alter our conclusion. As we observed last Term,
[i]f a precedent of this Court has direct application in a case, yet appears to rest on reasons rejected in some other line of decisions, the [lower courts] should follow the case which directly controls, leaving to this Court the prerogative of overruling its own decisions.
Rodriguez de Quijas v. Shearson/American Express, Inc., 490 U. S. 477, 490 U. S. 484 (1989). This is precisely what the State of Arkansas argued and what the Arkansas Supreme Court did in its original decision holding the HUE tax constitutional. Moreover, that court noted with reliance that we cited the Aero Mayflower cases with approval in Massachusetts v. United States, 435 U. S. 444, 435 U. S. 463 -464 (1978), one year after we decided Complete Auto Transit. 288 Ark. at 497, 707 S.W.2d at 762-763. The Arkansas Supreme Court correctly concluded that Scheiner established a "new principle of law" by overruling those aspects of the Aero Mayflower cases on which the State of Arkansas relied in enacting and assessing the HUE tax.
The conclusion that Scheiner established a new principle of law in the area of our dormant Commerce Clause jurisprudence does not necessarily end the inquiry. See Florida v. Long, 487 U. S. 223, 487 U. S. 230 (1988); Arizona Governing Committee for Tax Deferred Annuity and Deferred Compensation Plans v. Norris, 463 U. S. 1073, 463 U. S. 1109 -1110 (1983) (concurring opinion). It is equally clear to us, however, that the purpose of the Commerce Clause does not dictate retroactive application of Scheiner and that equitable considerations tilt the balance toward nonretroactive application. We observed in Scheiner that the Commerce Clause " by its own force created an area of trade free from interference by the States.'" 483 U.S. at 483 U. S. 280, quoting Boston Stock Exchange v. State Tax Comm'n, 429 U. S. 318, 429 U. S. 328 (1977). Petitioners argue that the retroactive application of Scheiner will tend to deter future free trade violations which the several States have strong parochial incentives to commit. As we have just discussed, however, the HUE tax was entirely consistent with the Aero Mayflower line of cases, and it is not the purpose of the Commerce Clause to prevent legitimate state taxation of interstate commerce. See Complete Auto Transit, 430 U.S. at 430 U. S. 288.
Finally, under the third prong of the Chevron Oil test, we consider the equities of retroactive application of Scheiner. Our decision today in McKesson makes clear that, once a State's tax statute is held invalid under the Commerce Clause, the State is obligated to provide relief consistent with federal due.process principles. See ante at 496 U. S. 36 -43. When the State comes under such a constitutional obligation, McKesson establishes that equitable considerations play only the most limited role in delineating the scope of that relief. Ante at 496 U. S. 44 -51. Of course, we had no occasion to consider the equities of retroactive application of new law in McKesson, because that case involved only the application of settled Commerce Clause precedent. See ante at 496 U. S. 31, n. 15. In light of McKesson's holding that a ruling that a tax is unconstitutionally discriminatory under the Commerce Clause places substantial obligations on the States to provide relief, the threshold determination whether a new decision should apply retroactively is a crucial one, requiring a hard look at whether retroactive application would be unjust. At this initial stage, the question is not whether equitable considerations outweigh the obligation to provide relief for a constitutional violation, cf. ante at 496 U. S. 44 -45, 496 U. S. 50, but whether there is a constitutional violation in the first place.
A careful consideration of the equities persuades us that Scheiner should not apply retroactively. Unlike McKesson, where the State enacted a tax scheme that "was virtually identical to the Hawaii scheme invalidated in Bacchus Imports, Ltd. v. Dias, 468 U. S. 263 (1984)," ante at 496 U. S. 46, and thus the State could "hardly claim surprise at the Florida courts' invalidation of the scheme," ibid., here the State promulgated and implemented its tax scheme in reliance on the Aero Mayflower precedents of this Court. In light of these precedents, legislators would have good reason to suppose that enactment of the HUE tax would not violate their oath to uphold the United States Constitution, and a state supreme court would have every reason to consider itself bound by those precedents to uphold the tax against a constitutional challenge. Similarly, state tax collection authorities would have been justified in relying on state enactments valid under then-current precedents of this Court, particularly where, as here, the enactments were upheld by the State's highest court.
Where a State can easily foresee the invalidation of its tax statutes, its reliance interests may merit little concern, see McKesson, ante at 496 U. S. 44 -46, 496 U. S. 50. By contrast, because the State cannot be expected to foresee that a decision of this Court would overturn established precedents, the inequity of unsettling actions taken in reliance on those precedents is apparent. Although at this point the burden that the retroactive application of Scheiner would place on Arkansas cannot be precisely determined, it is clear that the invalidation of the State's HUE tax would have potentially disruptive consequences for the State and its citizens. A refund, if required by state or federal law, could deplete the state treasury, thus threatening the State's current operations and future plans. Presumably, under McKesson, the State would be required to calculate and refund that portion of the tax that would be found under Scheiner to discriminate against interstate commerce, with the attendant potentially significant administrative costs that would entail. As McKesson makes clear, the State could also attempt to provide relief by retroactively increasing taxes on the favored taxpayers to cure any violation. But this too would entail substantial administrative costs, and could at some point run into independent constitutional restrictions. See ante at 496 U. S. 40, n. 23 ("[B]eyond some temporal point, the retroactive imposition of a significant tax burden may be so harsh and oppressive as to transgress the constitutional limitation."). Moreover, such an approach would unfairly penalize favored taxpayers for the State's failure to foresee that this Court would overrule established precedent. Although in the future States may be able to protect their fiscal stability by imposing procedural requirements on taxpayer actions, see McKesson, ante, at 496 U. S. 45, 496 U. S. 50, such prospective safeguards do not affect the inequities of retroactive application of Scheiner. Nor can Arkansas be faulted for continuing to rely on its statute after its highest state court upheld the constitutionality of the tax.
In sum, we conclude that applying Scheiner retroactively would "produce substantial inequitable results." Chevron Oil, 404 U.S. at 404 U. S. 107. The invalidation of the HUE tax has the potential for severely burdening the State's operations. That burden may be largely irrelevant when a State violates constitutional norms well established under existing precedent. See McKesson. But we think it unjust to impose this burden when the State relied on valid existing precedent in enacting and implementing its tax. Accordingly, we conclude that Scheiner does not apply to HUE taxation for highway use prior to June 23, 1987, for the HUE tax year ending June 30, 1987. [ Footnote 1 ]
The dissent suggests that federal courts should weigh equitable considerations only in determining the scope of relief a federal court should award. This is precisely backwards. As previously discussed, McKesson makes plain that equitable considerations are of limited significance once a constitutional violation is found. As the dissent's analysis ultimately makes clear, see, e.g., post at 496 U. S. 218 -219, n. 8, 496 U. S. 224, its suggested approach would effectively eliminate consideration of the equities entirely in a case such as this, when the judicial decision invalidating the State's taxation scheme represented a clear break from prior precedent. This is inconsistent with our nonretroactivity doctrine, and would work real and inequitable hardships in many cases.
Petitioners further argue that the equities always favor applying decisions retroactively when those decisions would burden only a governmental entity. They rely on Owen v. City of Independence, 445 U. S. 622, 445 U. S. 651 (1980), for the proposition that local governments should not be permitted to "disavow liability for the injury it has begotten." Owen is not applicable to our considerations here. That case only addressed the question whether Congress intended a municipality to have good faith immunity from actions brought under 42 U.S.C. § 1983. Our decision in Owen simply construed that statute through a consideration of its legislative history and the immunity traditionally accorded municipalities in 1871, when the forerunner of § 1983 was enacted. Id. at 445 U. S. 635 -650. Our delineation of the scope of liability under a statute designed to permit suit against governmental entities and officials provides little guidance for determining the fairest way to apply our own decisions. Indeed, the policy concerns involved are quite distinct. In Owen, we discerned that according municipalities a special immunity from liability for violations of constitutional rights would not best serve the goals of § 1983, even if those rights had not been clearly established when the violation occurred. Such a determination merely makes municipalities, like private individuals, responsible for anticipating developments in the law. We noted that such liability would motivate each of the city's elected officials to
consider whether his decision comports with constitutional mandates and… weigh the risk that a violation might result in an award of damages from the public treasury.
Id. at 445 U. S. 656. This analysis does not apply when a decision clearly breaks with precedent, a type of departure which, by definition, public officials could not anticipate nor have any responsibility to anticipate. See Rodriguez de Quijas v. Shearson/American Express, Inc., 490 U.S. at 490 U. S. 485.
In determining whether a decision should be applied retroactively, this Court has consistently given great weight to the reliance interests of all parties affected by changes in the law. See, e.g., Cipriano v. City of Houma, 395 U. S. 701, 395 U. S. 706 (1969) ("Significant hardships would be imposed on cities, bondholders, and other connected with municipal utilities if our decision today were given full retroactive effect"). To the extent that retrospective application of a decision burdens a government's ability to plan or carry out its programs, the application injures all of the government's constituents. These concerns have long informed the Court's retroactivity decisions. The Court has used the technique of prospective overruling (accompanied by a stay of judgment) to avoid disabling Congress' bankruptcy scheme, see, e.g., Northern Pipeline Construction Co. v. Marathon Pipe Line Co., 458 U. S. 50, 458 U. S. 88 (1982), and has refused to invalidate retrospectively the administrative actions and decisions of the Federal Election Commission, see Buckley v. Valeo, 424 U. S. 1, 424 U. S. 142 -143 (1976). The Court has also declined to provide retrospective remedies which would substantially disrupt governmental programs and functions. See, e.g., Lemon v. Kurtzman, 411 U. S. 192, 411 U. S. 209 (1973) ( Lemon II ) ("[S]tate officials and those with whom they deal are entitled to rely on a presumptively valid state statute, enacted in good faith and by no means plainly unlawful") (plurality opinion); see also Reynolds v. Sims, 377 U. S. 533, 377 U. S. 585 (1964) ("[U]nder certain circumstances, such as where an impending election is imminent and a State's election machinery is already in progress, equitable considerations might justify a court in withholding the granting of immediately effective relief in a legislative apportionment case, even though the existing apportionment scheme was found invalid"); Allen v. State Board of Elections, 393 U. S. 544 (1969). The retrospective invalidation of a state tax that had been lawful under then-current precedents of this Court threatens a similar disruption of governmental operations. Therefore, our refusal here to retroactively invalidate legislation that was lawful when enacted is in accord with our previous determinations of how best to give effect to new constitutional decisions.
B
Before and after the date of our Scheiner decision, some petitioners paid HUE taxes for the tax year beginning July 1, 1987. The Arkansas Supreme C