This appeal concerns the remedy available to taxpayers aggrieved by Iowa’s former income tax scheme which taxed federal government employees’ pensions but not those of state employees. Reversing a department of revenue decision, the district court on judicial review ordered refunds on timely-filed amended returns. We affirm *449 but modify the judgment to permit installment payments.
I.
Background.
In
Davis v. Michigan Department of Treasury,
Plaintiff Arlo Hagge, a former United States government employee who retired in 1969, responded to Davis by timely filing amended returns for 1985-1988, claiming a refund of state income taxes he paid in those years. The Iowa Department of Revenue (department) denied Hagge’s request for refund, asserting its view that Davis would not be applied retroactively. It also maintained that repeal of the offending tax scheme offered prospective relief that obviated the need to refund taxes “voluntarily” paid before the statute was invalidated.
Hagge protested the department’s decision and the case was submitted directly to Gerald Bair, director of revenue and finance, on a stipulated factual record. That record recited not only Hagge’s claimed refund for Iowa income taxes paid during the years in question ($10,137.65) but the state’s estimated refund liability to other Iowa federal employees were
Davis
applied retroactively ($40 to $45 million). Applying the three-prong test for retroactivity announced in
Chevron Oil Co. v. Huson,
Hagge petitioned for judicial review in the district court in accordance with Iowa Code section 17A.19 (1989). The district court, noting that judicial decisions generally operate both retroactively and prospectively, reversed the director’s decision. This appeal by the department of revenue followed.
The department raises three issues on appeal. It argues that (1) Davis should be applied prospectively only; (2) refunding taxes collected on pre-Davis federal pension income would be inequitable to the state and its taxpayers and, hence, an inappropriate remedy; and (3) federal retirees are not entitled to refunds based on Iowa Code section 422.73(2). 1 We shall consider these arguments in turn.
II.
Retroactivity.
Since the submission of this appeal, the Supreme Court has decided the retroactivity question adverse to the department. In
Harper v. Virginia Department of Taxation,
— U.S. -, -,
When this Court applies a rule of federal law to the parties before it, that rule is the controlling interpretation of federal law and must be given full retroactive effect in all cases still open on direct review and as to all events, regardless of whether such events predate or postdate our announcement of the rule. This rule extends Griffith’s ban against “selective application of new rules.” Mindful of the “basic norms of constitutional adjudication” that animated our view of retro- *450 activity in the criminal context, we now prohibit the erection of selective temporal barriers to the application of federal law in noncriminal cases. In both civil and criminal cases, we can scarcely permit “the substantive law [to] shift and spring” according to “the particular equities of [individual parties’] claims” of actual reliance on an old rule and of harm from a retroactive application of the new rule.
Id.
at -,
Harper controls our decision on the ret-roactivity issue, leaving the department no basis to challenge the district court’s ruling on this aspect of the case.
III.
Remedy.
While the
Harper
Court decided that
Davis
must be applied retroactively to the tax years at issue in Harper’s refund action, the Court stopped short of entering judgment for the petitioners. Instead it observed that the Constitution requires only that states provide relief “consistent with federal due process principles.”
Harper,
— U.S. at -,
If Virginia “offers a meaningful opportunity for taxpayers to withhold contested tax assessments and to challenge their validity in a predeprivation hearing,” the “availability of a predeprivation hearing constitutes a procedural safeguard ... sufficient by itself to satisfy the Due Process Clause.” On the other hand, if no such predeprivation remedy exists, “the Due Process Clause of the Fourteenth Amendment obligates the State to provide meaningful backward-looking relief to rectify any unconstitutional deprivation.” In providing such relief, a State may either award full refunds to those burdened by an unlawful tax or issue some other order that “create[s] in hindsight a nondiscriminatory scheme.”
Harper,
— U.S. at -,
In the case before us, the district court found that Hagge had no “real” predepri-vation remedy. The record reveals that for at least a decade before this action arose, Hagge regularly voiced his dissatisfaction with this discriminatory tax scheme to legislators and tax officials alike. The court observed, however, that Hagge was effectively limited to this letter writing campaign because “failure to pay the tax would have subjected him to even further difficulties.”
We agree. Although the department argues strenuously that Hagge could have long ago brought suit under Iowa Rules of Civil Procedure 261 and 266 to enjoin the unconstitutional collection of state income tax on his federal pension, we seriously question whether such process would qualify as “meaningful” under a McKesson analysis.
The department cites only one case,
Atchison, Topeka & Santa Fe Railway Co. v. Bair,
More recently — and perhaps more realistically — the department has strongly resisted efforts by taxpayers to seek relief in district court without exhausting administrative remedies.
See, e.g., McManus v. Iowa Dep’t of Revenue & Fin.,
Within the more customary channels for protesting tax assessments, the department cites neither statute nor administrative rule that would permit taxpayers to “withhold payment and then interpose their objections as defenses in a tax enforcement proceeding.”
McKesson,
For example, Iowa Code section 422.25(2) provides a penalty of seven and one-half percent for failure to pay ninety percent of the tax due when filing the return. See also 701 Iowa Admin. Code 10.41(3), (5) (adjusting computation of penalty under section 422.25(2) depending on taxable year). Section 422.26 grants the state a tax lien on all of a taxpayer’s property for failure to pay assessments when due. And, of course, interest accrues on all unpaid taxes at a rate tied to the prime. See Iowa Code § 421.7(2).
For these reasons we reject the department’s contention that Iowa affords its taxpayers sufficient predeprivation relief to satisfy the minimum requirements of due process and may thereby avoid the “clear and certain remedy” of refund dictated by
McKesson.
The department also tries to avoid its refund obligation by arguing the alleged inequity of imposing an onerous fiscal burden on the state in order to remedy the relatively modest deprivations suffered individually by Iowans who are also federal retirees. But equity cannot override the clear commands of the Due Process Clause outlined in
Harper
and
McKesson.
Because the state has exacted taxes from its citizens pursuant to an unconstitutional tax scheme, it must afford taxpayers a meaningful opportunity to secure postpayment relief.
McKesson,
Finally, we consider the department’s request that it be permitted to pay the required refunds on an installment basis, with interest, over a four-year period. Hagge does not resist forbearance, observing in accordance with
McKesson
that serious economic consequences might reasonably impact the “form of and fine-tuning [of] the relief to be provided.”
See McKesson,
Accordingly we affirm the judgment of the district court, modified to permit payment of the required refunds, with interest, over a period of four years.
AFFIRMED AS MODIFIED.
Notes
. The statute provides in pertinent part: If it appears that an amount of tax, penalty or interest has been paid which was not due ... [then] that amount shall be refunded to the person [or credited to tax that may become due].
