Short answer: no, postage stamps do not expire. A valid, undamaged U.S. stamp is good for postage indefinitely, no matter how old it is. Forever stamps always cover the current one-ounce First-Class letter rate, and older stamps with a printed value stay valid at that face value, you just add a little extra postage to make up the difference if rates have gone up since. The only stamps you cannot use are damaged, defaced, or already-used ones.
Here is the full picture: how Forever stamps, denominated stamps, and old vintage stamps each work, when a stamp actually cannot be used, and how to put that drawer of forgotten stamps to work.
Do postage stamps expire?
No. USPS stamps have no expiration date. A stamp you bought decades ago is still valid postage today, provided it is undamaged and has not already been used. What changes over time is not the stamp’s validity but its value relative to current rates, and that distinction is the key to the whole question. A stamp never becomes worthless; it may just no longer be enough on its own to cover today’s higher rate.
Forever stamps: value that never fades
Forever stamps, introduced by USPS in 2007, are the simplest case. A Forever stamp always covers the current one-ounce First-Class letter rate, whenever you use it. Buy one today at $0.82 and it will still mail a one-ounce letter years from now, even after the rate rises, with no extra postage needed. That is what makes them so useful: they are effectively inflation-proof, which is why stocking up on Forever stamps saves money over time. You can spot a Forever stamp because it has no dollar value printed on it, just the word Forever or a design with no number. For how they are sold and priced, see our guide on how many stamps are in a book.
Denominated stamps: still valid, just check the math
Stamps printed with a specific value, say an old $0.55 or $0.68 stamp, are called denominated stamps. They also never expire, but they are only worth their printed face value. So if the letter rate has risen since you bought one, the stamp still counts for exactly what it says, and you simply add postage to reach the current rate.
For example, an old $0.55 stamp is still worth $0.55 toward today’s $0.82 letter, so you would add $0.27 more in postage to make up the difference. The stamp is not wasted or expired, it just no longer covers a full letter by itself. If you are not sure how much to add, our free Stamp Calculator tells you the current rate and how to reach it.
What about old or vintage stamps?
Genuinely old stamps, the ones you find in a relative’s desk or an inherited collection, are still valid for postage at their printed face value, no matter how many decades old they are. A stack of vintage low-value stamps can be combined on one envelope to meet the current rate, which is a perfectly legitimate way to use them up.
Before you do, though, it is worth a second thought: some old and rare stamps are worth more to collectors than their postal value. If you have unusual or antique stamps, check a stamp-collecting guide or a dealer before sticking them on an envelope, since mailing a collectible destroys its value. For ordinary old Forever or definitive stamps, there is no such concern, use them freely.
When a stamp cannot be used
Stamps are durable, but a few things do make one unusable:
- Already used. A stamp that has been postmarked or canceled cannot be reused, even if the mark is faint.
- Damaged or defaced. A torn, heavily creased, or written-on stamp may be rejected, since USPS needs it intact and clearly valid.
- Missing adhesive. A very old stamp whose glue has failed can still be used if you tape it flat, but a stamp that will not stay on the envelope will not travel.
- Certain discontinued-service stamps. Rarely, a stamp made for a specific service that no longer exists may not apply to a current service, though it usually still holds face value toward regular postage.
Outside of these, the default is simple: if it is intact and unused, it works.
How to use up old stamps
If you have found a pile of odd-value stamps, here is the easy way to clear them:
- Combine them to hit the current rate. Add stamps together until they total at least today’s postage. For a standard letter that is $0.82, so two $0.55 stamps ($1.10) would more than cover it, for instance.
- Do not undershoot. USPS accepts extra postage but not less, so a letter with too little comes back marked postage due. When in doubt, round up.
- Check the total with a calculator. Our Stamp Calculator confirms the current rate for your mail so you know exactly how many old stamps to combine.
If you are working out postage for a heavier or unusual piece, our guide on how many stamps you need breaks it down by weight and type.
Frequently asked questions
Do postage stamps expire?
No. USPS stamps never expire. A valid, undamaged, unused stamp is good for postage indefinitely. What changes is its value relative to current rates, not its validity.
Can I still use old stamps?
Yes. Old stamps remain valid at their printed face value. If the rate has risen since, add postage to reach the current rate, or combine several old stamps to meet it.
Do Forever stamps expire?
No. Forever stamps never expire and always cover the current one-ounce First-Class letter rate, even if you bought them years ago at a lower price. No extra postage is needed.
My stamp has no price on it. Is it still good?
Yes. A stamp with no printed value is a Forever stamp, and it covers a standard one-ounce letter regardless of when you bought it.
Can I combine old and new stamps on one envelope?
Yes. You can combine any valid stamps, old or new, as long as the total meets or exceeds the current postage rate. USPS accepts extra postage but not less.
Are my old stamps worth money to collectors?
Some rare or antique stamps are worth more than their face value. If you have unusual old stamps, check with a collecting guide or dealer before mailing them, since using a collectible as postage destroys its value.
The bottom line
Postage stamps do not expire. Forever stamps always cover a standard letter, denominated and vintage stamps stay valid at their face value, and the only stamps you cannot use are damaged, defaced, or already-used ones. If you have found old stamps, combine them to reach today’s rate and mail away, just round up rather than down, and set aside anything that looks rare in case it is worth more to a collector than to the Post Office.
