Treasury bill calculator: the price, interest and yield of a T-bill at the latest auction rates.

Enter a face value and a bill term to see what you pay, the interest you earn and the yield. Treasury bills are short-term US government debt. They are sold at a discount and pay their face value at maturity, so the interest is the difference between what you pay and what you get back. The calculator uses the results of the most recent auction for each term, published by the Treasury on TreasuryDirect. The latest 26-week bill auction on September 28, 2026 priced at a 4.285% discount rate, an investment rate of 4.441%.

You pay–
Interest at maturity–
Price per $100–
Investment rate (yield)–

Face value is bought in $100 steps. The investment rate is the bond-equivalent yield, calculated with the Treasury's own formulas in 31 CFR Part 356. Change the discount rate to test another auction result.

Latest Treasury bill auction results

Most recent auction for each term on or before September 30, 2026. The investment rate is the yield Treasury publishes for the bill; the discount rate sets the price.

TermAuctionMaturesDiscount rateInvestment ratePrice per $100CUSIP
4-weekSep 24October 27, 20263.850%3.915%99.700556912797VN4
6-weekSep 29November 12, 20263.970%4.044%99.536833912797UY1
8-weekSep 24November 24, 20263.990%4.071%99.379333912797VY0
13-weekSep 28December 31, 20264.110%4.211%98.961083912797VJ3
17-weekSep 23January 26, 20274.135%4.251%98.633153912797WR4
26-weekSep 28April 1, 20274.285%4.441%97.833694912797WM5
52-weekSep 29September 30, 20274.400%4.616%95.551111912797WJ2

Treasury bill rates over the last eight auctions

13-week bill: last eight auctions

AuctionInvestment rate
September 28, 20264.211%
September 21, 20264.113%
September 14, 20264.066%
September 8, 20263.890%
August 31, 20263.859%
August 24, 20263.803%
August 17, 20263.802%
August 10, 20263.823%

26-week bill: last eight auctions

AuctionInvestment rate
September 28, 20264.441%
September 21, 20264.303%
September 14, 20264.203%
September 8, 20264.023%
August 31, 20264.018%
August 24, 20263.918%
August 17, 20263.907%
August 10, 20263.960%

How Treasury bills work

  • You can buy bills in TreasuryDirect from $100, in $100 increments. A non-competitive bid is capped at $10 million per auction.
  • Terms are 4, 6, 8, 13, 17, 26 and 52 weeks. The 52-week bill is auctioned every four weeks; the others every week.
  • Price = face value × (1 − discount rate × days ÷ 360). For a $10,000 26-week bill at the latest discount rate of 4.285%, you pay $9,783.37.
  • Interest on bills is subject to federal income tax but not to state or local income taxes.
  • Cash management bills are sold only through a bank, broker or dealer, not in TreasuryDirect.

Questions

What is the current 13-week Treasury bill rate?

The 13-week bill auctioned on September 28, 2026 had an investment rate of 4.211% and a discount rate of 4.110%.

Why is the yield higher than the discount rate?

The discount rate is calculated on face value over a 360-day year. The investment rate is calculated on the price you actually pay over a 365-day year, so it is always a little higher.

Do I pay state tax on Treasury bill interest?

No. TreasuryDirect states that federal tax is due on the interest and no state or local taxes apply.

Sources

More data from NY Presswire: the US economic calendar and all tools and trackers.