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.

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.

What happens to an expired money order?

U.S. Postal money orders are an exception — they never expire and never lose value. The post office will honor its money orders for the exact amount printed on the document regardless of how old the money order is.