Series I
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The earnings rate for Series I Savings Bonds is a combination of a fixed rate, which will apply for the life of the bond, and the inflation rate. An I Bond's composite earnings rate changes every six months after its issue date. Here's how the composite rate for I bonds issued November 2009 - May 2010 was set:
Fixed rate = 0.30%
Semiannual inflation rate = 3.06%
Composite rate = 3.36%
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