$500 I Bond with 0.30% Fixed Rate Purchased September 2018

 Jan
1
Feb
1
Mar
1
Infla
tion
Rate
Com
posite
Rate
Apr
1
May
1
Jun
1
Jul
1
Aug
1
Sep
1
Infla
tion
Rate
Com
posite
Rate
Oct
1
Nov
1
Dec
1
2018 500.001.11%2.52%501.00502.00503.202018
2019504.20505.20506.40

From $500.00 to $506.40 over 0.5 years = 2.56% average annual increase compounded semi-annually.

Generated  05/01/18  10:11