I bond fixed rates are determined each May 1 and November 1. Each fixed rate applies to all I-bonds issued in the six months following the rate determination.
The Current I Bond Composite Earnings Rate is 1.54% and the Top Rate for older i Bonds is 5.17%! (See Rates for Older Series I Bonds)
For more about how I Bond Rates are calculated, see
Disclaimer: I own Series I Bonds in my personal account (some have base rates of 3.0%! I also currently have them in my Newsletter Explore Portfolio.