T-Bill-Calciulator

Fixed Income — T-Bill Ladder & Effective Annual Return

Model short-term Treasury bill returns, reinvestment ladders, and effective annual return (XIRR).

Total Investment (USD)

Yield (% per year)

Enter the quoted yield. Choose the type below.

Yield Type Simple annual yield (investor yield, 365-day) T-bill discount quote (360-day basis)

Bill term (days)

Typical short-term T-bill terms: 28, 91, 182 days, etc.

Ladder rungs

Days between ladder rungs

How many days between each new ladder purchase.

Assumed reinvest yield (%)

Yield you expect when you reinvest proceeds (same yield type as above).

Horizon to compute effective annual return (days)

XIRR will be computed for this horizon starting today.

Face value unit (for T-bill mode) 100 (per $100 face) 1000 (per $1,000 face)

Projected Effective Annual Return (XIRR)

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Total Value at Horizon

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Total Cash Inflows

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Notes: "T-bill discount quote" uses the standard price = Face × (1 − d × days/360). For a simple annual yield we use direct proportional accrual on a 365-day year.