Postmark Changes Impact Time-Sensitive Mail
On December 24, 2025, the USPS changed how it applies postmarks. Instead of showing the day you dropped your mail off, the postmark may now reflect the day the item is first processed at a sorting facility, which can sometimes be days later.
Key Takeaways
- Postmarks may no longer reflect when you mail items.
- Electronic payment is the safest and most reliable option.
- If you can’t pay electronically, use certified mail for proof.
Why does correct postmarking matter?
Tax authorities use the postmark date to determine whether a mailed tax return or payment was on time. If the postmark date is after the deadline, the filing or payment may be treated as late—even if it was mailed by the due date.
How to protect against penalties?
- Use electronic payment (highly recommended). Paying online gives instant proof of when the payment was sent. With this method, you don’t have to worry about postmarks or mail delays.
- For Federal IRS payments use https://www.irs.gov/payments
- For State, PA payments use https://mypath.pa.gov/
- Use certified mail. Go to the post office counter and ask for certified mail. Please note that this service has an additional fee. The certified stamped receipt will show the exact date the item was mailed. Keep this receipt with your tax records as proof, if needed in the future.
- Ask for a hand-stamped postmark. Go to the post office counter and ask the clerk to hand-stamp your envelope with the date. This shows the actual date the item(s) were mailed. However, it doesn’t provide proof if the mail date is contested at a future time.
- Mail early (not recommended). If you can’t use certified mail or make an electronic payment, mail your documents several days or weeks in advance of the deadline to hopefully prevent problems.
Final Recommendation: Postmarks may no longer reflect when you mail an item. Electronic payment is the safest and most reliable option. If that is not possible, use certified mail for documents that you send to a taxing authority and keep your receipts.
Questions about the impact of postmark changes?
Meet our tax advisor and get answers to your questions.
Questions about the impact of postmark changes?
Mike Stoltzfus, CPA, MST
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