EE Bonds. EE bonds were available in paper form through banks until the end of 2011. Now the Treasury sells them in electronic form on its TreasuryDirect website and through payroll deduction plans. EE bonds earn interest until final maturity, which is 30 years from the date of issue. Find the issue date on your paper bonds, or check the date of issue and final maturity of electronic bonds in your account at TreasuryDirect. You can also use the online TreasuryDirect savings bond calculator to find the final maturity dates of paper bonds.