Summary
- 12-month core inflation rose to 2.4%, the highest number since September 2008.
- Non-seasonally adjusted inflation was essentially flat, meaning minimal principal increases for TIPS and little change in the six-month total that will reset the I Bond’s variable rate.
- CPI-W was also flat, marking the first month of the three-month period that will set Social Security’s COLA for 2019.
Read my full analysis on SeekingAlpha.com
Also, I have updated my I Bonds and Inflation page with these new numbers.
Also updated: Social Security COLA calculations.
And here are new September Inflation Indexes for all TIPS.

The Savings Bond Calculator will calculate the value (principal plus accrued interest) for each month for all of your I-bonds…