31 C.F.R. § 359.14
Current through September 30, 2024
Composite rates are set according to the following formula (See appendix A to part 359 for examples of calculations involving composite interest rates.):
Composite rate = {(Fixed rate ÷ 2) + Semiannual inflation rate + [Semiannual inflation rate * (Fixed rate ÷ 2)]} * 2.
Example for I bonds issued May 2002-October 2002:
Fixed rate = 2.00%
Inflation rate = 0.28%
Composite rate = [0.0200 ÷ 2 + 0.0028 + (0.0028 * 0.0200 ÷ 2)] * 2
Composite rate = [0.0100 + 0.0028 + 0.000028] * 2
Composite rate = 0.012828 * 2
Composite rate = 0.025656
Composite rate = 0.0257 (rounded)
Composite rate = 2.57% (rounded)
31 C.F.R. §359.14