For a letter mailed today I will gladly postmark you Tuesday . . .
U.S. Postal Service rules changes could mean delays for mail being postmarked by one or more days after it is received by the post office. This could cause payments and reports to be counted late for any submissions to the agency that are date sensitive.
The Postal Service has instituted a nationwide change (effective 12/24/25) that affects when postmarks are affixed to mail. Unless a customer requests a postmark at a Postal Service retail location, postmarks are no longer added when mail is first received but are automatically stamped later while being sorted and processed at regional distribution centers.
This means your mail could be postmarked several days after you drop it in a mailbox. Because many federal and state laws define timely payment based on the Postal Service’s postmark, payments or reports may be considered delinquent if they are mailed too close to a deadline — even if they were, in fact, placed in a mailbox before the deadline date.
