Most genuine, unused U.S. postage stamps do not expire simply because they are old. USPS says stamps issued since 1860 are generally valid unless DMM 604 lists them as invalid. Validity still depends on the stamp’s type, condition, authenticity and whether it has already been used.
Four states to distinguish
| Stamp condition | Can it normally be used? | What to check |
|---|---|---|
| Unused and intact older U.S. stamp | Generally yes | Printed or applicable value, authenticity and current mailpiece price |
| Already cancelled or used on delivered mail | No | It cannot be reused even if the cancel is faint |
| Covered, badly damaged, cut, defaced or contaminated | Do not treat as normal valid postage | Ask USPS or the seller about an unused defective item |
| Suspicious source or printing | Stop and verify | Use USPIS counterfeit-postage guidance |
Forever versus fixed denomination
A domestic Forever stamp follows the current First-Class Mail one-ounce letter value—82¢ from July 12, 2026—when the mailpiece qualifies. A 32¢ or 44¢ stamp remains worth the printed amount and can be combined with other valid postage. Neither rule makes used or counterfeit stamps valid.
When one Forever stamp is not enough
- The letter weighs over one ounce
- The letter is square, rigid or otherwise nonmachinable
- The piece is a large envelope, package or different mail class
- The destination is international
- An extra service is requested
Storage and condition
Keep unused stamps dry, flat and on their original backing. Do not tape over them or remove stamps from delivered mail. A collectible item can remain interesting even when it is not suitable for postal use; collector value and postal value are separate.