How to calculate I bond ratesThe Treasury adjusts I bond rates every May and November, and there are two parts to I bond yields: a variable and fixed portion.
The variable rate moves every six months based on inflation, and the Treasury can change the fixed rate every six months, but that doesn't always happen.
The variable rate resets every six months starting on the investor's I bond purchase date, not when the Treasury announces new rates.
Currently, the variable rate is 3.94% and the fixed rate is 1.30%, for a rounded combined yield of 5.27% on I bonds purchased between Nov. 1 and April 30.
However, the headline rate may be different than what you receive because the fixed rate stays the same for the life of your bond.
Persons:
Ken Tumin
Organizations:
U.S . Department of, Treasury