USPS changed its postmark system effective December 24, 2025. Instead of postmarking mail on the day it is mailed, postmarks are now applied when the mail reaches an automated postal distribution center.
What does that mean to the consumer? IRS, financial institutions and elections departments are examples of institutions which rely on a postmark to prove timely mailing. A flexible postmark system does not guarantee that mail will not be viewed as late even if it is put into the mail system on time.
What are some steps the consumer can take?
- Use electronic methods where available.
- Go to a USPS retail counter and request a manual, round date postmark.
- Use Certified Mail, Registered Mail or a Certificate of Mailing for proof.
- Mail items well in advance of a due date.
- Send items through a carrier other than USPS.