September inflation sets Social Security COLA at 2.0%, new I Bond variable rate at 2.48%


  • Hurricane-boosted gasoline prices have caused a two-month surge in overall inflation.
  • The Social Security cost-of-living adjustment will be 2.0% for 2018, lower than the Social Security Administration’s projection but higher than looked likely three months ago.
  • The I Bond will get a new variable rate of 2.48% on November 1, an attractive number that was also boosted by the two-month surge in inflation.

Read my full analysis on

Also, I have updated my Tracking Inflation and I Bonds page with the new numbers.

And here are the new November inflation indexes for all Treasury Inflation-Protected Securities.


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