## Facts

- Before marrying, Paul Mapes and Jane Bryson (later Jane Mapes) made an oral prenuptial agreement about finances, intending to keep their earnings and expenses separate and to handle money much as they had while single.
- After marrying, the couple filed a joint federal income tax return for the 1976 tax year.
- Under the Internal Revenue Code (IRC) § 1 rate schedule applicable to married taxpayers filing jointly, their 1976 federal income tax liability was $8,532.10.
- The couple calculated that if they had remained unmarried and each filed as a single taxpayer, their combined liability would have been $7,312.00.
- They sought a refund of the difference—$1,220.10—contending that § 1 imposed an unconstitutional “marriage penalty” on certain two-earner married couples.
- They argued § 1 was unconstitutional because it (1) burdened the right to marry, (2) had a discriminatory impact on women by treating wives as secondary earners and husbands as primary earners, and (3) was invalid under Hoeper v. Tax Commission of Wisconsin, which struck down a state law taxing spouses’ combined income without an alternative.
- The couple attempted to distinguish a recent federal district court decision rejecting similar constitutional attacks on the marriage penalty, arguing that their prenuptial agreement made their situation different.
- The United States, through the IRS, denied the refund claim, and the couple sued in the Court of Claims.
- The parties filed cross-motions for summary judgment, presenting purely legal and constitutional questions.

## Issues

1. Whether IRC § 1’s married-filing-jointly rate structure, which can require some married couples to pay more tax than two similarly situated single taxpayers, violates the Due Process and equal-protection components of the Fifth Amendment.
2. Whether any increased tax liability tied to marriage unconstitutionally burdens the fundamental right to marry.
3. Whether IRC § 1 violates Fifth Amendment equal protection principles by discriminating against women, based on its asserted disparate impact on wives as “secondary earners.”
4. Whether Hoeper v. Tax Commission of Wisconsin requires invalidation of IRC § 1’s treatment of married taxpayers, and whether the couple’s prenuptial agreement changes the constitutional analysis.

## Decision

- The Court of Claims granted the government’s motion for summary judgment and denied the couple’s motion.
- The court held IRC § 1 constitutional as applied to the couple’s 1976 tax liability and rejected each of their constitutional theories.
- The court distinguished Hoeper and concluded it did not control the federal joint-return and rate-schedule framework.
- The couple’s refund claim for $1,220.10 was denied, and judgment was entered for the United States.

## Legal Principles

- Congress has broad authority to set tax classifications and rate schedules, and courts generally review federal tax line-drawing under a deferential rational-basis standard.
- A statute does not unconstitutionally burden the right to marry merely because it changes the financial consequences of marriage; absent a direct legal barrier to marriage, rational-basis review applies.
- A facially sex-neutral tax rule keyed to marital status and income levels is not unconstitutional solely because labor-market patterns may cause some groups to bear higher taxes more often; a disparate impact, without a sex-based classification or purposeful discrimination, does not trigger heightened scrutiny.
- Hoeper involved a state scheme that attributed one spouse’s income to the other for taxation; the federal system’s joint-return framework and marital rate schedules operate differently and therefore are not invalid under Hoeper.
- In a progressive income tax with separate filing statuses for married and single taxpayers, complete neutrality between marriage and non-marriage is not achievable in all cases; selecting among competing distributional goals is a legislative policy choice.

## Conclusion

Mapes v. United States rejected a married couple’s attempt to recover the added tax they attributed to the federal “marriage penalty” after filing a joint return for 1976. The Court of Claims held that IRC § 1’s rate structure reflects permissible congressional policy judgments, does not directly interfere with the right to marry, does not create unconstitutional sex discrimination, and is not controlled by Hoeper; accordingly, the couple was not entitled to a refund.


Mapes v. United States, 576 F.2d 896 (1978)