Treasury bonds, you may have noticed some series ee savings bonds mature on different dates. Investors who purchase a companys bonds receive interest on the bond and are promised a return on their investment at a future date. In order to redeem a bond, you have to be listed as the owner or co-owner of that bond. If you inherit a savings bond and youre not listed on the bond as an owner, that bond is. They are safe, offer a fixed rate of interest, and are not subject to state or local income taxes. Treasury recommends cashing all savings bonds that have reached final maturity because that is when they stop earning interest. However, the treasury has extended original maturity dates from 10 to 30 years, making it harder to know when final maturity occurs. Treasury usually earn interest for 30 years, after which time the bond has matured. A mature bond doesnt earn any interest or gain value in any other way. In most cases, you owe federal tax on the interest the bond accrued during its lifetime. Ee savings bonds are issued with a cost that is one-half of the face value. Treasury guarantees that your bond will double in value to reach face value after 20 years. If it does not, the treasury will make a one-time adjustment to a bonds value up to the savings bond maturity amount. --whats the tax implication of cashing a savings bond? Unless you elected to pay taxes on the interest on an annual basis, which few people do, you must pay federal income tax on the bonds in the year they mature -- even if you dont cash them in. Use the tables below to determine whether your savings bonds have stopped earning interest. You should keep a list of your bonds, by serial number, in a safe location and separate from the actual bonds. To learn whether a savings bond on your list has been cashed, contact treasury retail securities services p. Series ee and i are intended to be savings bonds, and series hh is intended to be an investment bond. Series ee bonds series ee bonds mature after 30 years, meaning they can earn interest for that.