Hoeper v. Tax Comm'n of Wis.

Background

A Wisconsin man and his wife each earned income and filed separate tax returns. The state tax assessor added the wife’s earnings to the husband’s income and taxed him on the combined total, producing a higher bill. The husband paid under protest, sued to recover the excess, and argued that the law violated the Constitution’s protections for due process and equal treatment.

Reasoning

The Court asked whether a state may measure one person’s tax by including another person’s separate income. The majority explained that Wisconsin law treats a married woman’s earnings as her own separate property. Because the wife’s income was not the husband’s, the state could not lawfully make that income part of his tax base. The Court rejected the state’s arguments that the rule was needed to prevent fraud or that it was simply a regulation of marriage. It concluded that taxing one person by reference to another’s separate income is arbitrary and violates constitutional protections, so the judgment upholding the tax was reversed.

Real world impact

The decision prevents a state from increasing one spouse’s tax liability by treating the other spouse’s separately owned earnings as the first spouse’s income. Married people whose states treat a spouse’s earnings as separate property are protected from having those earnings used to compute the other spouse’s tax. The case was reversed and sent back for further proceedings consistent with this ruling.

Dissents or concurrances

Justice Holmes dissented, arguing the legislature may define the tax consequences of marriage and that including spouses’ incomes could be justified to prevent tax evasion; Justices Brandeis and Stone joined his view.