Domestic money orders never expire and they do not accrue interest. Money orders are cashed for the exact amount on the order. You can cash a USPS money order at a Post Office for free. You can also cash them at most banks and some stores.

How long does a money order stay valid for?

No. However, depending upon the state of purchase, if you do not use or cash the money order within one to three years of the purchase date, a non-refundable service charge will be deducted from the principal amount (where permitted by law).

What happens to a money order if it is not cashed?

If the money order has been cashed, the issuer will not replace it or refund the purchase amount. ... But if the money order goes missing, you have a good chance of getting your money back—minus a fee and a few weeks' delay—as long as it hasn't been cashed.