TBillLab

T-Bill Return Calculator

See the dollar profit and annualized return on a T-bill.

Your T-bill numbers never leave your browser — all math runs locally.
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Try: Face value=1000, Purchase price=980, Days to maturity=182 → $1,000, $980, $20, 0.0396%, 0.0409%, 0.0409%

How to use

The profit is simply face value minus purchase price. Annualizing it over the holding period gives the return you actually earn.

FAQ

How is profit taxed?

The discount is reported as interest income federally, but exempt from state tax.

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