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How to Calculate Treasury Bill Yields
You buy Treasury bills at a discounted price — say $96 for a four-week bill — and receive the face value of $100 at the end of the four weeks.
Alieza Durana is a former investing writer at NerdWallet. She has over a decade of journalism experience covering housing, labor, gender and public policy issues for the Eviction Lab, The Fuller Project for International Reporting, New America and Slate. Her work has appeared in USA Today, The Washington Post, The Atlantic and Harvard Business Review. She is based in St. George, Utah.
Courtney Neidel is an assigning editor for the core personal finance team at NerdWallet. She joined NerdWallet in 2014 and spent six years writing about shopping, budgeting and money-saving strategies before being promoted to editor. Courtney has been interviewed as a retail authority by "Good Morning America," Cheddar and CBSN. Her prior experience includes freelance writing for California newspapers.
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Interested in buying Treasury bills but don’t know how you’ll make money? We’ll explain.
T-bills don’t pay interest in the same way as other Treasurys. Instead, you buy the bills at a discounted price and hold them until the end of the term. Once the term ends, or reaches maturity, you receive the face value.
Let's look at a Treasury bill auction to see how a Treasury bill purchase works.
On May 15, 2024, the Treasury held an auction for a 17-week Treasury bill with an issue date of May 21 and a maturity date of Sept. 17. The price per $100 amounted to about $98.27, or an annualized discount rate (shown as a "high rate" in TreasuryDirect) of 5.225%.
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If you bought $1,000 worth of T-bills in this auction, that means you would have paid $982.73 on May 15. On Sept. 17, you'd receive $1,000, earning $17.27 on your investment.
If you were to reinvest in this T-bill for one year, you could arrive at an annual investment rate for your 17-week T-bill based on the actual purchase price of $982.73.
To explore how this works, use our T-bill calculator below.
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