As of August 2015, EE bonds and I bonds are the only interest-yielding savings bonds that the U.S. Department of the Treasury sells, according to TreasuryDirect. EE bonds provide a higher yield, with a fixed annual interest rate of 0.30 percent.
The fixed annual interest rate and the composite rate of I bonds is 0.00 percent, according to TreasuryDirect. Both bonds compound interest semiannually. Bond owners can earn interest for up to 30 years. The fixed rate for both bonds is set twice per year, on the first day of May and November. TreasuryDirect tables show that interest rates for both bonds have steadily declined, especially since 2008.