IBondLab

I Bond Tax Calculator

Federal and state tax treatment of I-bond interest.

Your I-bond numbers never leave your browser — all math runs locally.
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Try: Purchase amount=1000, Purchase year=2023, Years=5 → $402, Deferred until redemption, Exempt, $402

How to use

I-bond interest is federal-tax-deferred until redemption and exempt from state tax. The calculator shows the taxable amount.

FAQ

Can I skip federal tax?

Only by using I-bonds for qualified higher-education expenses, subject to income limits.

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