The United States Postal Service (USPS) is implementing changes in 2026 that could lead to postmark delays. Mail will primarily be postmarked at regional processing centers instead of local post offices. This shift, part of a modernization plan, may result in fewer daily pickups and longer transport times, potentially causing mail to receive a postmark date later than its actual mailing date. This could affect the timely delivery of tax returns, ballots, and bills.