USPS Postmark Rule Change
Don’t assume “mailed by the deadline” means “on time”. Starting December 24, 2025, the USPS clarified something important: a postmark date doesn’t necessarily reflect the day you dropped off your mail. Instead, USPS says the postmark date is tied to when your item reaches the first USPS processing facility—which could be later than the day you put it in a mailbox or handed it to a local post office.
Why this matters.
Many time-sensitive items (like tax forms, payments, legal documents, IRA and HSA contributions, and other deadline-driven mail) often rely on the postmark date as proof something was sent on time. With this change, an envelope you drop off “by the deadline” could still receive a postmark dated after the deadline, which may create problems if a postmark is used to determine whether something was timely.
What to do instead.
To reduce the risk of missing a deadline:
- Mail earlier than the deadline whenever possible.
- If timing is tight, go to a USPS retail counter and request a manual (hand) postmark.
- Consider a Certificate of Mailing to document the date USPS accepted your item.
- When available, use electronic or online submission/payment options, which provide clear timestamps.
Bottom line: A postmark isn’t always the “drop-off date” anymore. If a deadline matters, plan ahead or use a method that gives you clear proof of when you mailed (or submitted) it.
What this means for DFCU Financial members.
We’re sharing this information to help prevent confusion around mailing dates. USPS postmark timing changes don’t alter our commitment to working with members fairly and transparently.
If you ever have questions about mailed correspondence or timing, our team is available to help clarify. You can reach the Member Service Center at 888.336.2700.