Treasury bills are short-term loans to the federal government. A buyer pays less than face value today and collects the full amount at maturity, four to 52 weeks later, per TreasuryDirect. That discount is the entire return, and the minimum purchase is just $100 in $100 increments, per TreasuryDirect. For an individual saver, that makes bills the most direct slice of federal debt.
The second appeal sits on the tax form: interest on bills is subject to federal income tax but exempt from state and local income tax, per TreasuryDirect. That combination of short terms, auction pricing, and state-tax exemption is rare in one product. Readers weighing bills against 401(k) space can start with how account contribution limits work, and this site's investing library holds the wider context.
What Terms and Auctions Are Available?
Treasury sells bills in fixed terms of 4, 6, 8, 13, 17, 26, and 52 weeks, per TreasuryDirect's bill page. Weekly auctions cover every term through 26 weeks. The 52-week bill auctions every four weeks. Cash Management Bills add variable terms, but banks, brokers, and dealers handle those, not retail accounts.
Auction days follow published schedules. A saver who wants a specific maturity date, such as a tuition bill, can pick the term landing closest and wait for that week's sale. Timing is predictable enough to plan around.
How Does Discount Pricing Create the Return?
Bills pay no coupons. Interest is the gap between the discounted purchase price and the face value received at maturity, fixed at auction, per TreasuryDirect. Coupon bonds instead pay scheduled interest along the way. Hold a bill to maturity and the return is known on purchase day, in both dollars and date.
Real numbers make it concrete. The 13-week bill issued Oct. 22, 2026 carried a high discount rate of 4.095 percent, equal to a 4.195 percent investment rate, per TreasuryDirect auction data. A $10,000 purchase at that auction therefore paid back a bit more than $10,100 in January 2027, at the awarded price per $100 of face value.
Where Do You Buy Bills, and How Do Bids Work?
Individuals buy through a TreasuryDirect account or through a bank, broker, or dealer, per TreasuryDirect. The usual retail route is a noncompetitive bid: accept whatever rate the auction sets, and Treasury fills it first. Competitive bidders name their terms and take what is left, which is why institutions use them. Readers following this should also see What a Money Market Fund Is and When to Use One.
Results post after 5 PM Eastern time on auction day, per TreasuryDirect's auction guide, so the wait is measured in hours. The account reinvests automatically into the next bill of the same term. A brokerage route costs more in fees but keeps bills on one statement and allows secondary-market sales.
How Are Treasury Bills Taxed?
Federal income tax applies to bill interest, and state and local income taxes do not, per TreasuryDirect. A bank savings account works the other way around, with interest taxable at every level. For savers in high-tax states, the exemption can add a meaningful slice of after-tax yield, though the exact value depends on each household's bracket and state rate.
One planning note follows from the calendar. Interest arrives at maturity, so taxes on it land in the year the bill matures, not the year of purchase. A bill bought in December with a 13-week term pushes its interest into the next tax year.
How Does a Simple Bill Ladder Work?
A ladder spreads purchases across several maturities so cash frees up on a rolling schedule. Hypothetical example with round numbers: split $12,000 equally across 4-, 8-, 13-, and 26-week bills at $3,000 per rung. When each rung matures, reinvest the proceeds into a fresh 26-week bill. After one full cycle, a maturity arrives roughly every four weeks.
The ladder trades a little yield for steady access. Longer rungs usually pay more when the yield curve slopes upward, though that shape changes, and past patterns are not a promise. Each reinvestment takes whatever rate that week's auction sets. We covered a connected angle in How to Start Investing With Little Money in 2026.
Conclusion: A Plain Tool With Clear Rules
Treasury bills bundle short terms from 4 to 52 weeks, discount pricing, weekly auctions, and a state-tax exemption, per TreasuryDirect. A $100 minimum keeps the door open to nearly any saver, and results arrive within hours of each auction. Bills suit money with a date attached, a ladder suits money that matures in stages, and neither suits growth capital. The rules are public and the pricing transparent.
