https://www.jrcpa.com/usps-postmark-rule-change-what-it-means-for-tax-filers-and-deadlines/
USPS Postmark Rule Change: What It Means for Tax Filers and Deadlines
Dec 17, 2025 - Starting December 24, 2025, the U.S. Postal Service (USPS) will change how postmark dates are determined.
usps postmark rulewhat it means