When Is a Postmark Really a Postmark? The IRS Postmark Rule
The IRS postmark rule determines whether a tax return is considered filed on time based on the date it is mailed rather than the date it is received. A postmark is an official USPS mark that cancels the stamp and indicates when the Postal Service received the envelope. Understanding how the IRS postmark rule works is essential for avoiding late-filing penalties and protecting your compliance with tax deadlines.
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