USPS Changes to Postmark Date System Taking Effect December 24, 2025 — Current Federal Tax Developments

Summary of the Final Rule The United States Postal Service (USPS) has adopted a final rule ( FR Doc. 2025-20740 ) adding Section 6 08.11, "Postmarks and Postal Possession," to the Domestic Mail Manual (DMM). The rule formally defines postmarks and identifies the types of markings that qu