i savings bonds: Original post by Jonathan Langsdorf of Demand Media Series I bonds from the U.S. Treasury earn a variable rate of interest based on the rate of inflation. The Treasury adjusts the current bond interest rate every 6 months, on May 1 and November 1. The rate is based on the consumer price index (CPI). A Series I bond will then earn the new rate for the next 6 months. Since the rate is variable, the
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