Savings bonds are sold in two varieties, I bonds and EE bonds. EE bonds pay a fixed rate of interest until maturity (20 years after issue) and then are guaranteed to double in value. I Bonds pay a fluctuating rate of interest which is tied to inflation. Or, to be more precise, I Bonds have a fixed component which remains constant through the life of the bond and a floating component that tracks the Consumer Price Index (CPI-U).
On November 1st, 2013 the Treasury Department Announced the rates for newly purchased saving bonds. These rates are applicable for savings bonds purchased from November 1 st, 2013 through April 30th, 2014:
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