31 CFR § 359.8
How does interest accrue on Series I savings bonds?
July 31, 2023
§ 359.8 How does interest accrue on Series I savings bonds?
A bond accrues interest based on both a fixed rate of return and a semiannual inflation rate. A single, annual rate called the composite rate reflects the combined effects of the fixed rate and the semiannual inflation rate. For more information, see appendix B of part 359.