02/19/2026
If you still mail IRS returns or payments, USPS postmark timing matters.
Postmarks may reflect processing dates rather than drop-off dates, and the IRS uses that date to determine whether a filing is timely.
In order to protect your filing date, here are some practices you can follow:
1. Request a manual (local) postmark at the counter:
USPS states that customers who want a postmark that aligns with the date of mailing can request a manual (local) postmark at a retail location.
2. Use Certified Mail or Registered Mail:
USPS notes that Registered Mail and Certified Mail provide mailing receipts (proof of acceptance). From an IRS standpoint, having strong documentation matters when the timeliness of a filing or payment is questioned.
3. Purchase a Certificate of Mailing:
USPS advises that if you want proof of the date USPS first accepted the item, you can purchase a Certificate of Mailing.
4. Consider IRS-approved private delivery services (where appropriate):
The IRS maintains a list of designated private delivery services that qualify under timely mailing rules for certain filings and payments. It is important to note that only services and/or designations listed by the IRS count, so don’t assume any courier service qualifies.
5. Avoid last-week mailing whenever possible:
If you’re mailing close to a deadline, build in extra time and use one of the documentation methods above. This is especially important in the 1–2 weeks leading up to major filing deadlines.
A few simple process changes, especially using counter postmarking and proof-of-mailing services, can help employers protect their filing dates and reduce compliance risk.
Contact us to learn how to protect your business before the next tax deadline: https://buff.ly/WnLlSFW
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