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Recent guidance from the United States Postal Service may affect how paper tax returns are treated when filing close to deadlines.
Since the Internal Revenue Service uses the postmark date to determine whether a return is filed on time, these changes could create new risks if you mail tax documents at the last minute.
What changed?
Starting December 24, 2025, a postmark may reflect when mail is processed at a USPS facility rather than when it is dropped in a mailbox or handed to a postal employee.
This matters because:
- Mail may travel farther before being processed
- Same-day postmarks are not guaranteed
- The date on the envelope may not match the day you mailed it
Under IRS rules, a return is considered timely if it is postmarked on or before the filing deadline.
Why this matters for taxes
If mail is processed after the deadline, even if you mailed it earlier, the return could be treated as late. This may lead to:
- Failure-to-file penalties
- Interest charges
- Additional notices or follow-up paperwork
Postal consolidation and centralized processing may increase the chance that mail dropped on a deadline is not postmarked until the next day.
How to protect yourself
If you mail a paper return, consider these steps:
Mail early
Avoid waiting until the deadline. Mailing several days in advance reduces risk.
Request a manual postmark
Visit a staffed USPS counter and ask for a round-date postmark as proof of same-day mailing.
Use certified or registered mail
Tracking and mailing documentation can help verify submission.
Consider private delivery services
The IRS accepts certain approved carriers for timely filing. Visit https://www.irs.gov/filing/private-delivery-services-pds to view a full list.
The easiest option: E-file
Electronic filing removes the uncertainty of mail processing.
With e-filing:
- Your return is time-stamped when received by the IRS
- You get immediate confirmation
- Filing does not depend on postal routing or processing delays
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