Take mailed estimated tax payments to a USPS retail counter

On November 24, 2025, the U.S. Postal Service published a notice in the Federal Register clarifying its postmark policies, effective December 24, 2025. https://www.federalregister.gov/documents/2025/11/24/2025-20740/postmarks-and-postal-possession

The new policy is also explained in this article from the USPS Newsroom. https://about.usps.com/newsroom/statements/010226-postmarking-myths-and-facts.htm

Instead of dating the postmark when an item of mail is accepted by the USPS, the postmark is generally dated when the item is processed at its automated processing facility, which might be several days after its accepted.

This might cause an issue for items mailed, but not postmarked, by a critical due date, such as a tax filing due date or voting day for a mail-in ballot.

Here are three ways to ensure a postmark showing the date of delivery:

1. Request a Manual Postmark. Take the mailpiece to a USPS retail counter and request a “manual (local) postmark”. The postmark will be applied when the item is accepted. There is no additional charge for this service.
2. Postage Validation Imprint (PVI). When postage is purchased at a retail counter and a PVI label is printed, the label will indicate the date of acceptance.
3. Certificates of Mailing. A customer may purchase a Certificate of Mailing, or use Registered or Certified Mail, to get a receipt serving as evidence of the date the item was presented for mailing.

Note that the date on customer-applied pre-printed labels, such as from self-service kiosks, Click-N-Ship, or postage meters is not evidence of the mailing date or when the USPS accepted the item.

So, when you’re mailing a tax form, such as the next estimated tax payment due on January 15, 2026, or sending a mail-in ballot close to the deadline, take the item to a USPS retail counter and request a manual postmark, a Postage Validation Imprint, or a Certificate of Mailing.