For decades, taxpayers have relied on a simple principle known as the "Mailbox Rule." Formally enshrined in Internal Revenue Code Section 7502, this rule states that "timely mailing is timely filing"—meaning if you drop your return in the mail by the deadline, it is legally considered filed on time, even if the IRS receives it days or weeks later. However, as of December 24, 2025, the United States Postal Service (USPS) implemented a significant rule change that could put your "timely filing" status at risk.
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