A stamp that has already paid postage cannot legally be used again, even if the cancellation mark is faint or absent.
Used versus old
Age alone does not make a stamp invalid. The key question is whether it has already been used. A canceled stamp, one attached to delivered mail, or one showing evidence of removal should not be reused.
Damaged adhesive or backing
If an unused stamp is torn, contaminated, missing important printed areas, or no longer adheres properly, do not improvise with transparent tape. Ask USPS about an acceptable remedy.
Combining older unused stamps
Unused fixed-denomination stamps may be combined to reach current postage. Unused Forever Stamps follow their applicable current category.
Frequently asked questions
Can I reuse an unmarked stamp from received mail?
No. A stamp that has already traveled through the mail has been used even if no cancellation is obvious.
Can old unused stamps still work?
Generally yes, when genuine, unused, undamaged, and sufficient for the current required postage.
Can I tape a loose stamp on?
Do not cover or improvise with tape; follow USPS guidance for damaged or detached postage.
Sources and update note
Rates and mailing standards can change. This page was reviewed in August 2026; verify the completed mailpiece when its weight, dimensions, shape, destination, or services are uncertain.