Summary

William J. Brennan, Jr. McKesson Corporation v. Division of Alcoholic Beverages and Tobacco Department of Business Regulation of Florida…

The question before us is whether prospective relief, by itself, exhausts the requirements of federal law. The answer is no: If a State places a taxpayer under duress promptly to pay a tax when due and relegates him to a postpayment refund action in which he can challenge the tax's legality, the Due Process Clause of the Fourteenth Amendment [14] obligates the State to provide meaningful backward-looking relief to rectify any unconstitutional deprivation.
Source: Wikisource

William J. Brennan, Jr. McKesson Corporation v. Division of Alcoholic Beverages and Tobacco Department of Business Regulation of Florida…

We repeatedly have recognized that determining whether a particular business cost has in fact been passed on to customers or suppliers entails a highly sophisticated theoretical and factual inquiry; a court certainly cannot withhold part of a refund otherwise required to rectify an unconstitutional deprivation without first satisfactorily engaging in this inquiry. [31]
In any event, however, we reject respondents' premise that "equitable considerations" justify a State's attempt to avoid bestowing this so-called "windfall" when redressing a tax that is unconstitutional because discriminatory.
Source: Wikisource

William J. Brennan, Jr. McKesson Corporation v. Division of Alcoholic Beverages and Tobacco Department of Business Regulation of Florida…

But even if a State chooses to provide partial refunds as a means of curing the unlawful discrimination (as opposed to increasing the tax assessment of those previously favored) , the State's interest in financial stability does not justify a refusal to provide relief. As noted earlier, see supra, at 46, the State here does not and cannot claim that the Florida courts' invalidation of the Liquor Tax was a surprise, and even after the trial court found a Commerce Clause violation the State failed to take reasonable precautions to reduce its ultimate exposure for the unconstitutional tax.
Source: Wikisource

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