Tax Legal Services · Primary-source case analysis

Carlton: Modest Retroactive Tax Legislation Satisfied Due Process

By Aneeta Mishra and Timothy Chan

Published September 13, 2026

United States v. Carlton explains the due-process test for retroactive federal tax legislation.

A deduction was used beyond Congress’s intended scope

An executor bought employer stock after death, transferred it to an employee stock-ownership plan, and claimed an estate-tax deduction under newly enacted text. Congress later limited the deduction to stock owned immediately before death.

Congress corrected an unexpected revenue loss

The amendment was designed to prevent a broad and unintended tax benefit. Congress acted promptly after learning that the original language could produce substantial revenue consequences.

Rational-basis review governed

The Court asked whether the retroactive application served a legitimate legislative purpose furthered by rational means. The short corrective period was neither arbitrary nor irrational.

Reliance did not establish a constitutional violation

The Court acknowledged the executor’s transaction but held that detrimental reliance alone did not make the amendment unconstitutional. It reversed the refund judgment.

Key takeaways

• Check both the transaction date and every amendment’s effective date.
• Distinguish statutory interpretation from a constitutional retroactivity claim.
• Document reliance but apply the deferential due-process test.
• Measure the length and purpose of the retroactive period.