Postmark vs Postage: What Is the Difference?
Postage is what you pay to mail something. A postmark is the mark USPS applies showing when it was processed. Here is why the difference matters.
By Nathan Crank
Tag
Postmark
USPS postmarks, postmark dates, and their role in IRS filings, legal deadlines, and proof of mailing.
4 articles with this tag
Postmark Date and Tax Returns: The IRS Mailbox Rule After the 2026 USPS Change
The IRS treats a timely postmark as a timely filing. But USPS postmark dates no longer match your drop-off date. Here is how to protect yourself at tax time.
By Nathan Crank
How to Postmark a Letter: USPS Rules and Options
USPS postmark dates no longer match your drop-off date. Learn how to get a manual postmark for free, why it matters for deadlines, and your alternatives.
By Nathan Crank
Postmark vs Proof of Mailing: What a USPS Postmark Actually Means in 2026
USPS postmarks don’t always equal the day you dropped mail. Here’s what a postmark means in 2026—and how to get real proof of mailing (with the right USPS services).
By Postmarkr Team