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USPS postmark procedure change

3/19/26

By: Nancy Reimer and Ryne Sack

The U.S. Postal Service has implemented a significant operational change that alters how attorneys and claimants should think about postmarks on time‑sensitive mail. As of December 24, 2025, the date reflected in a USPS postmark no longer reliably represents the day a document was actually mailed. Instead, the postmark now generally reflects the date when an item is first processed at a USPS automated facility, which may occur one or more days after the document was deposited in a mailbox or accepted at a local post office.

This shift introduces new uncertainty into professional services professions, including lawyers, accountants, real estate professionals particularly in areas where a “postmarked by” deadline determines whether a filing is timely. In the past professionals could confidently rely on the idea that dropping a document into a mailbox before the last pickup or handing it to a postal clerk on the due date would result in a matching postmark. Now, a document mailed on time may nevertheless appear untimely if processing delays cause the postmark to reflect a later date. The USPS characterizes this change as a clarification rather than a new rule, but the practical impact is clear.

For professionals, this change heightens the importance of planning around mailing delays. Time‑sensitive documents should now be sent earlier than in years past, allowing for the possibility that automated processing will not occur until the following day. When the exact mailing date must be documented, it is advisable to request a manual postmark at a USPS retail counter, as this is applied at the moment of acceptance and accurately reflects the true date of mailing. Likewise, services such as Certified Mail, Registered Mail or a Certificate of Mailing provide independent proof of the date a document was handed to USPS personnel and can help avoid disputes if automated postmarks appear late.

Professionals should adjust their internal practices to account for this change. Although the shift may seem minor, its effect on legal deadlines is substantial, and taking proactive steps now can prevent unnecessary challenges and protect clients’ rights.

For more information on this topic contact, Nancy Reimer at nancy.reimer@fmglaw.com, Ryne Sack at ryne.sack@fmglaw.com or your local FMG attorney.

Information conveyed herein should not be construed as legal advice or represent any specific or binding policy or procedure of any organization. Information provided is for educational purposes only. These materials are written in a general format and not intended to be advice applicable to any specific circumstance. Legal opinions may vary when based on subtle factual distinctions. All rights reserved. No part of this presentation may be reproduced, published or posted without the written permission of Freeman Mathis & Gary, LLP.