How is the interest rate on EE U.S. savings bonds determined?

Effective May 1, 2005, the interest rate on new Series EE bonds is fixed for the life of the bond. Existing Series EE bonds purchased before May 1, 2005, were not affected and continue to earn interest based on 90% of the average market yield of five-year Treasury securities.

Series EE bonds have used this variable interest rate method of crediting interest since 1982. Interest rates on previously issued U.S. savings bonds will continue to change every six months on …