Treasury bill rates today: read the auction before comparing the yield

There is no single Treasury bill rate today. A 4-week bill and a 52-week bill mature on different dates and come from different auctions. A bill offered at auction also has several rate-related figures attached to it, which can make a simple rate lookup feel harder than it should.

The cleanest place to start is TreasuryDirect's announcements, data, and results page. It links to upcoming auctions, recent results, and the auction query for older securities. Check the security term and auction date before copying any number. A result from last month is history, not today's quote.

This guide does not publish a current yield because bill rates change at auction and in the secondary market. Once you find a live result, the CD and Treasury Yield Calculator can turn an annual yield and term into a rough dollar estimate.

Start with the term, auction date, and issue date

Treasury bills mature in 4, 6, 8, 13, 17, 26, or 52 weeks. Treasury auctions the 4- through 26-week terms weekly and the 52-week bill every four weeks. Cash Management Bills follow no regular schedule and are not sold through TreasuryDirect.

An auction result should identify at least three dates worth separating:

  • The auction date is when bids are accepted and the price is set.
  • The issue date is when Treasury delivers the security and collects payment.
  • The maturity date is when Treasury pays face value.

Those dates answer different questions. The auction date tells you how fresh the rate is. The issue and maturity dates tell you how long the money will be committed. They also keep two bills with similar labels from being mistaken for the same security.

A bill's CUSIP is its security identifier. If you are comparing a TreasuryDirect result with a brokerage listing, matching the CUSIP and maturity date is safer than matching on a label such as "6-month T-bill." Brokerage screens may round the remaining maturity or display a bill that has already been issued.

Bills earn a discount instead of a coupon

A conventional Treasury bill does not send monthly interest or a semiannual coupon. Treasury sells it at a discount or at face value, then pays face value at maturity. The difference between the purchase price and the maturity payment is the interest.

TreasuryDirect gives this price formula for a bill:

Price = face value × (1 − (discount rate × time) ÷ 360)

The formula explains why a quoted rate is not the amount deposited into the account. A buyer usually pays less than face value at issuance. The account receives the full face value at maturity, assuming Treasury makes the scheduled payment.

Do not confuse the purchase price with a fee. The gap is how bill interest is created. A brokerage may have separate fees, markups, or spreads, particularly for a secondary-market trade, so its trade confirmation still deserves a careful read.

The high rate and investment rate answer different questions

Recent bill results commonly show a high rate and an investment rate. They are not duplicate labels for one calculation.

The high rate comes from the auction's accepted competitive bids and is expressed on a bank-discount basis. That convention uses face value as the base and a 360-day year. It is part of the machinery that determines the bill's auction price.

The investment rate restates the return using the price paid as the base under Treasury's bill-yield convention. For an individual comparing a bill with another annual yield, the investment rate is usually the more useful figure to carry into a screening calculation. It is still not a bank APY, and it does not make unlike products identical.

This distinction prevents a common error: taking the high rate from an auction result and placing it beside a CD's APY as though both percentages were built the same way. They are not. The bill's holding period, price basis, and day-count convention differ from the deposit account's APY calculation.

Use the investment rate for a first-pass comparison, then compare actual dollars over the intended term. The Treasury bills versus CDs guide covers the tax, insurance, liquidity, and renewal differences that one percentage leaves out.

Noncompetitive buyers do not choose the rate

Treasury auctions accept competitive and noncompetitive bids. TreasuryDirect's auction guide says noncompetitive bidders agree to accept the rate, yield, or discount margin set at the auction. TreasuryDirect account holders must bid this way.

Competitive bidders state the rate they will accept and must bid through a bank, broker, or dealer. Treasury accepts compliant noncompetitive bids first, then competitive bids from the lowest offered rate upward until the offering is awarded. Successful bidders receive the same final rate, yield, or margin as the highest accepted bid.

For a household investor, that means the exact auction price is unknown when a noncompetitive order is submitted. The order specifies the face amount, not a minimum acceptable yield. The final auction result determines what Treasury collects on the issue date.

This is different from buying an existing bill in the secondary market. There, a broker can display an indicated yield and price before the order. The quote may move, and the trade can include a bid-ask spread. Check whether the displayed yield is to maturity, which settlement date it assumes, and whether the price is clean of fees.

Price per $100 turns the auction into dollars

The rate attracts attention, but price per $100 is the shortest route to the cash required.

If an auction result shows the price for each $100 of face value, multiply that price by the face amount divided by 100. The difference between the resulting purchase amount and face value is the interest earned at maturity, before tax, if the bill is held to maturity.

TreasuryDirect allows bill purchases in $100 increments and lists $100 as the minimum. A noncompetitive bid can be as large as $10 million per auction. Brokers can set their own account minimums or order conventions even when the underlying security trades in smaller increments.

The CD and Treasury Yield Calculator uses simple interest from an annual yield. It is useful for a quick estimate, but an official auction price is better for calculating the exact purchase debit and maturity difference. Calculator output should not override the auction result or trade confirmation.

Today's auction rate is not a guaranteed rate tomorrow

A bill fixes its return when it is purchased and held to maturity. It does not fix the rate available when the money comes back.

This matters because short bills mature quickly. Reinvesting a 4-week bill for a year requires a string of future auctions. Each new auction can settle at a higher or lower rate. Multiplying today's 4-week result across 13 periods quietly assumes the same rate will keep returning, which is not promised.

TreasuryDirect allows scheduled reinvestments for bills. Its reinvestment guide says a bill reinvests into the same term, and bill reinvestments can be scheduled for up to two years. The number allowed depends on the term. TreasuryDirect closes the option to change or schedule a reinvestment four business days before the relevant auction.

Automation removes calendar work, not rate uncertainty. The replacement bill takes the rate set at its own auction. If no appropriate security is issued, TreasuryDirect says it cancels the reinvestment and sends the proceeds to the designated bank account or Certificate of Indebtedness.

Taxes can change the CD comparison

TreasuryDirect states that bill interest is subject to federal income tax but not state or local income tax. A bank CD's interest is generally subject to federal and state income tax, though individual circumstances and state rules can vary.

That tax difference can matter in a state with an income tax. It does not mean the Treasury investment rate can simply be treated as fully tax-free. Federal tax still applies, and the timing or reporting of a transaction may depend on whether the bill matures or is sold.

The Tax-Equivalent Yield Calculator can test federal and state tax assumptions. Treat its result as a screening estimate. It does not model every deduction, local rule, account type, or filing situation.

A bill held to maturity and a bill sold early are different trades

Holding a bill to maturity produces the stated face-value payment. Selling before maturity produces whatever price the market offers at that time.

The market price can move when interest rates change. A short bill usually has less price sensitivity than a long Treasury note or bond, but "less" is not "none." A sale can also involve a spread or brokerage charge.

Where the bill is held affects the exit. A broker may provide a secondary-market sell order in the same account. A bill in TreasuryDirect must be transferred to a bank, broker, or dealer before it can be sold. That transfer process makes TreasuryDirect a poor substitute for a checking account when cash could be needed immediately.

Match the maturity date to the expected spending date whenever possible. Selling early turns a known maturity payment into an unknown market price.

A quick checklist for reading a bill result

Before comparing a Treasury bill rate, record:

1. The term and CUSIP. 2. The auction, issue, and maturity dates. 3. The investment rate used for the first comparison. 4. The high rate and its bank-discount convention. 5. The price per $100 and total purchase debit. 6. Whether the order is a new auction purchase or a secondary-market trade. 7. Any brokerage fee, markup, or bid-ask spread. 8. The federal and state tax assumptions. 9. Whether the bill will mature before the cash is needed. 10. What happens at maturity: bank deposit, manual purchase, or scheduled reinvestment.

This takes a few minutes and catches most of the mistakes caused by copying the first percentage on the page. Browse the Economy section for more explainers on rates, inflation, Treasury securities, and household cash.

Educational only. This article provides general information, not personalized financial, investment, tax, or legal advice. Auction terms, rates, brokerage practices, and tax rules can change. Confirm current details with TreasuryDirect, the brokerage or financial institution, and an appropriate tax professional.

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