USPS postmark rule change: what the rule says and what did not change

The USPS postmark rule change is a new section of the Domestic Mail Manual, 608.11, in force since 24 Dec 2025. It puts a definition of the postmark into the mailing standards, which USPS says no current regulation had, and it says that a postmark applied by a machine shows the date of the first automated processing of the piece, not necessarily the day you mailed it. USPS says its practice did not change. What changed is the written definition, and how long mail can take to reach the machine.

We read the sources on 13 Nov 2026: the final rule in the Federal Register (90 FR 52883), the text of DMM 608.11 as it stands today, and the USPS statement Postmarking Myths and Facts of 2 Jan 2026. Certisent is not affiliated with USPS.

The facts in one table

Item	Detail
Name of the rule	Postmarks and Postal Possession
Where it lives	Domestic Mail Manual, section 608.11
Proposed	12 Aug 2025 (90 FR 38716)
Final rule published	24 Nov 2025 (90 FR 52883)
In force since	24 Dec 2025
Public comments	130, about 80 of them form letters
What USPS says it changes	"does not change any existing postal operations or postmarking practices"

What the rule says

A postmark has two possible dates. Section 608.11.1: "If applied at a retail unit, the postmark displays the name or location of the retail unit and the date on which the mailpiece was accepted at the retail unit. If applied at a processing facility, the postmark displays the name or location of the processing facility and the date of the first automated-processing operation performed on that mailpiece."

Most postmarks are the second kind. Section 608.11.2: "Postmarks are generally applied by the Postal Service via automation on machines in originating processing facilities."

So the date can be later than the day you mailed. Section 608.11.3: "The date inscribed by a postmark applied at a processing facility may be later than the date that the mailpiece was first accepted by the Postal Service."

A postmark still means something. The same section: "The presence of a postmark confirms that the Postal Service accepted custody of a mailpiece, and that the mailpiece was in the possession of the Postal Service on the identified date."

No postmark means nothing either way. "The absence of a postmark does not imply that the Postal Service did not accept custody of a mailpiece, because the Postal Service does not postmark all mail in the ordinary course of operations."

What did not change, in USPS's words

News coverage called this a new way of postmarking. USPS answered that directly on 2 Jan 2026:

"The Postal Service has not changed and is not changing our postmarking practices, which have been consistent since we began moving away from hand-canceling every item at Post Offices decades ago."

The Federal Register notice makes the same point about the rule itself: "this is not a rulemaking in the traditional sense," because "nothing in DMM Section 608.11 effectuates any changes in how, or the extent to which, the Postal Service applies postmarks to mailpieces." The reason given for writing it down: "the postmark was not previously defined in any current Postal Service regulations."

USPS also rejects the idea that the postmark was ever a service for proving a mailing date: "postmarking is not and has not been a service that the Postal Service has provided to the public for such purposes. The postmark has always fundamentally existed to perform functions (including cancelation of postage) internal to Postal Service operations."

What did change: the trip to the machine

The practical change is in transport, and USPS says so in the same statement: "we have made adjustments to our transportation operations that will result in some mailpieces not arriving at our originating processing facilities on the same day that they are mailed. This means that the date on the postmarks applied at our processing facilities will not necessarily match the date on which the customer's mailpiece was collected by a letter carrier or dropped off at a retail location."

The Federal Register notice names the program: the Regional Transportation Optimization initiative. It says the gap between the mailing date and the postmark date "has and will become more common" with it.

That is the whole story in two lines. The stamp works as before. The mail may reach the stamp later than it used to.

The kinds of postmark, side by side

Section 608.11.2 lists four markings that count as postmarks.

Marking	Where it is applied	The date it shows
Automated machine postmark	Originating processing facility	First automated-processing operation on the piece
Manual postmark on mail the machine could not cancel	Originating processing facility	The date the first automated operation "would have been performed"
Manual (local) postmark	Retail counter, when you ask for it	The date the piece was accepted at that counter
Postage Validation Imprint (PVI) label	Retail counter, when a clerk prints your postage	The date the piece was accepted at that counter

Only the last two are tied to the day you handed the mail over.

Two things are not postmarks at all:

• Postage you printed yourself. "Pre-printed labels applied by the customer prior to mailing (e.g., postage printed from Self-Service Kiosks (SSK), Click-N-Ship online postage, and meter strips) show merely that a customer has purchased postage and the date on which the postage was printed."
• Scans and machine tags. Section 608.11.6 says these "indicate possession of a mailpiece; however, they do not constitute evidence of the date when the Postal Service first accepted possession of a mailpiece."

How to get a postmark dated the day you mail

Section 608.11.4 gives the route: "Customers who want a postmark aligning with the date on which the Postal Service first accepted possession of their mailpiece may request, for no additional fee, a manual (local) postmark at any Post Office, station, or branch when tendering their mailpiece."

What that means in practice:

1. Go to the counter. A blue collection box or your own mailbox sends the piece to the machine.
2. Hand the mail to the clerk and ask for a manual postmark. USPS also calls it a local postmark.
3. There is no fee for it.
4. If you bring 50 pieces or more, the standards ask you to "contact the postmaster or other manager in advance."

If you pay for postage at the counter and the clerk prints the label, that PVI label carries the acceptance date too.

If you need a record you can keep

A postmark is on the envelope, and the envelope goes to the recipient. Section 608.11.5 is headed "Services Proving the Date of Postal Acceptance" and names three services that leave a receipt in your hands:

Service	What you keep	USPS fee, on top of postage
Certificate of Mailing (PS Form 3817)	A certificate round-dated by the clerk. No delivery record.	$2.45
Certified Mail	A numbered receipt, round-dated if presented to a clerk, plus a delivery record	$5.55
Registered Mail	A registration receipt, plus a delivery record	From $20.90

Fees are from Notice 123, price list effective 4 Oct 2026. Our proof of mailing guide compares them in detail.

Taxes: what the IRS regulation already said

Much of the alarm was about tax returns. The rule on timely mailing is 26 CFR 301.7502-1, and it did not change with DMM 608.11. It already placed the risk of a late postmark on the sender:

"If the postmark does not bear a date on or before the last date, or the last day of the period, prescribed for filing the document or making the payment, the document or payment is considered not to be timely filed or paid, regardless of when the document or payment is deposited in the mail. Accordingly, the sender who relies upon the applicability of section 7502 assumes the risk that the postmark will bear a date on or before the last date, or the last day of the period, prescribed for filing the document or making the payment."

The regulation then names the way out: if a document is sent by U.S. certified mail "and the sender's receipt is postmarked by the postal employee to whom the document or payment is presented, the date of the U.S. postmark on the receipt is treated as the postmark date of the document or payment. Accordingly, the risk that the document or payment will not be postmarked on the day that it is deposited in the mail may be eliminated by the use of registered or certified mail."

Note the condition: the receipt has to be postmarked by a postal employee. That happens at the counter. We read the regulation on 13 Nov 2026. This is a report of its text, not tax advice. State tax agencies, courts and election offices have their own rules about postmarks; check the one that applies to you.

Ballots

USPS says its guidance "is the same for all types of mailpieces, including mail-in ballots." In the Federal Register notice it repeats advice it calls long-standing: mail a completed ballot before Election Day, "and at least one week before it must be received by their local election office," or ask for a manual postmark at a retail counter. Whether a postmark date counts for a ballot is decided by state election law, not by USPS.

What this means if you send a letter through Certisent

Certisent prints your letter and hands it to USPS as Certified Mail. Three things follow from the rule above, and you should know them before you choose this route:

• You do not get a receipt postmarked by a postal employee. You get USPS tracking, an electronic return receipt and our own proof of mailing document. If your deadline is defined by a postmark or by a clerk-stamped certified mail receipt, as in the tax rule above, mail it yourself at a post office counter.
• We cannot promise a postmark date or a delivery date. If your letter has a deadline, send it early.
• For a letter where what matters is a dated trail and a delivery record, such as a dispute or a request, the route from your screen gives you a tracking number and a USPS delivery record. The price is $14.99 for a letter of up to the included pages.

This page is general information about postal rules. It is not legal or tax advice.