Privacy Policy
Start Here
Research
IPO & Public Offerings
Economy & Macro
Latest
Stock Market
Market Education
Energy & Commodities
Capital Markets
Federal Reserve & Rates
About
Contact

series i bonds

Series I Bonds Explained: Composite Rate, Inflation Math, Tax

September 23, 2026 by Bruno M.

AI-generated editorial image: A minimalist wooden study desk with a linen document folder, notebook, and natural window lighting.

Understand how Series I savings bonds work, including the composite rate formula, inflation adjustments, 12-month lockup, early penalties, and tax rules.

Categories Market Education Tags inflation protected bonds, investing basics, savings bonds, series i bonds, treasurydirect

Search

Explore ECMSource

New here? Begin with our guide to the site, then explore the subjects that match what you want to understand.

Start Here
Market Education
Stock Market
Capital Markets
Federal Reserve & Rates

Subscribe to Our Newsletter

Please leave this field empty

Oh hi there 👋
It’s nice to meet you.

Sign up to receive awesome content in your inbox, every month.

We don’t spam! Read our privacy policy for more info.

Check your inbox or spam folder to confirm your subscription.

Privacy Policy
Editorial Policy
Corrections Policy
Financial Disclaimer
Contact
About Bruno M.
Investor Tools