USPS Postmark changes • ATTENTION •

Posted on 01/13/2026

The USPS has changed how postmarks are dated, and it could impact time-sensitive mail like tax returns, bill payments, legal documents, and even ballots.

What’s changed?

Postmarks now reflect the date your mail is first processed by an automated sorting machine — not the day you drop it in a mailbox or hand it over at the counter. That processing can happen days later.

Why it matters:

Many deadlines depend on postmark dates. A delayed postmark could mean late fees, penalties, or missed deadlines, even if you mailed it on time.

The U.S. Postal Service (USPS) recently changed its postmark rule (effective late 2025) so the date on mail now reflects when it's first processed by automated machines at a facility, not when you dropped it in a mailbox or at a counter. This means mail dropped on a deadline day might get a postmark from the next day or later, impacting deadlines for taxes, ballots, or bills, so mailers should send time-sensitive items several days early or get a hand-stamped postmark at a retail counter for proof.

Key Changes Explained

Old Rule: Postmark generally showed the date USPS received the mail piece (drop-off date).
New Rule (Since Dec 24, 2025): Postmark shows the date it enters an automated sorting machine at a processing center, which can be later.

Why: The change aligns with network consolidation, but creates potential delays for deadlines.

What This Means for You

Potential for Delays: Items dropped close to a deadline might be postmarked after the deadline, potentially leading to late fees or penalties.
Time-Sensitive Mail: This affects tax returns, ballots, legal documents, and bill payments.

How to Ensure On-Time Delivery

Mail Early: Send important items several days before the actual deadline.
Go Inside: Take the mail to a post office retail counter and request a clerk to hand-stamp it with the current date.
Use Certified/Registered Mail: These services provide dated receipts for proof.
Use Digital Options: Utilize online portals for payments and filings when available.

United States Postal Service - https://www.usps.com/