Postmarks and Postal Possession(federalregister.gov)
federalregister.gov
Postmarks and Postal Possession
https://www.federalregister.gov/documents/2025/11/24/2025-20740/postmarks-and-postal-possession
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Keep in mind for next time, the date you drop the mail in your local post office might not be the date it is postmarked. Impacts voting, bank fees, IRS and more.