Data as of Oct 5, 2026Based on 27,405 AI responses
Reviewed by Dimitry Apollonsky ·
Series I Savings Bonds are U.S. Treasury inflation-indexed savings bonds sold electronically through TreasuryDirect (minimum $25). They earn interest monthly with a fixed rate that never changes and an inflation rate that resets every six months, with the combined rate applied semiannually for up to 30 years. They can be redeemed after 12 months (with a penalty if redeemed before 5 years), and earnings are subject to federal tax but not state tax, with value tracked in your TreasuryDirect account or via the Savings Bond Calculator.
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