IBondLab

I Bond Calculator 2025

Value of a 2025 Series I savings bond purchase.

Your I-bond numbers never leave your browser — all math runs locally.
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Try: Purchase year=2025, Purchase amount=1000, Valuation year=2026, Valuation month=8 → 3.98%, 19, $1,064, $64, $11, $1,054

How to use

2025 I-bonds carried about a 1.1% fixed rate with a composite near 4.0% — solid but below 2023’s peak.

FAQ

Do 2025 rates still beat banks?

Usually yes on an after-tax basis, since the interest is state-tax-free.

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