How to Buy Treasury Bills at Auction

The simplest way to buy Treasury bills at auction is to place a noncompetitive bid through TreasuryDirect, the U.S. Department of the Treasury’s online platform. You set an amount (minimum $100), specify a maturity term (4 weeks to 52 weeks), and let the auction determine your yield—avoiding the complexity of competitive bidding while guaranteeing your purchase at the average accepted discount rate.

Opening a TreasuryDirect Account

Before you can bid, you must create a free account at treasurydirect.gov. You’ll provide your Social Security number, bank account details for funding and redemption, and basic identity information. The process takes 10 minutes and your account activates immediately, though your first purchase may require an additional verification step. Once approved, your account remains open indefinitely—there are no fees, no maintenance requirements, and you can buy and hold as many bills as you wish.

Understanding the Auction Schedule

The Treasury issues bills on a strict weekly schedule: 4-week, 13-week, and 26-week bills every Tuesday; 52-week bills on the fourth Tuesday of each month. (If Tuesday falls on a holiday, auctions shift to Wednesday.) Each auction has a deadline—usually the same day at 11:00 a.m. Eastern Time for online bids—and you can submit your bid any time before that cutoff through TreasuryDirect.

The auction announcement includes the issue date (typically the Thursday after the auction) and maturity date. Your cash funds the purchase on the issue date and you receive your principal back on the maturity date.

The Noncompetitive Bid Advantage

As a retail investor, you’ll place a noncompetitive bid. This means you’re not competing on price; you’re simply saying “I want to buy $X of this T-bill.” The Treasury guarantees acceptance of all noncompetitive bids and assigns you the average discount rate that competitive bidders established during the auction. You get certainty—your order will fill—without needing to guess what rate to bid.

This differs from competitive bidding, which is used by institutions and traders who specify an exact discount rate and risk rejection if their bid is too low. Noncompetitive bidding is designed for retail investors and is by far the most common path.

How Discount Rates Translate to Yield

Treasury bills trade on a discount rate basis, not a coupon. When the auction announces a 5.20% discount rate, you don’t receive 5.20% in interest payments; instead, you pay less than par (face value). The difference between your purchase price and $10,000 (the standard par value) is your interest income.

The discount rate formula is:

Purchase Price = Par × (1 − Discount Rate × Days to Maturity / 360)

For a 13-week (91-day) bill at a 5.20% discount rate: Purchase Price = $10,000 × (1 − 0.052 × 91 / 360) = $9,868.11

You pay $9,868.11 and receive $10,000 at maturity, earning $131.89 in interest. The bond-equivalent yield (which annualizes the actual return over the holding period) is slightly higher than the discount rate—roughly 5.35% in this example—because your purchase price is lower relative to par.

TreasuryDirect calculates these conversions automatically when you review your bid. You’ll see both the discount rate and the investment yield so you know the true economic return.

Placing Your Bid

Log into TreasuryDirect, navigate to “BuyDirect,” select the bill maturity you want (4-week, 13-week, 26-week, or 52-week), and confirm the auction details. Enter the amount (in $100 increments; most retail buyers stick to $1,000–$50,000 ranges). Select “Noncompetitive Bid,” confirm your bank account for funding, and submit. You’ll receive an order confirmation immediately.

You can place your bid days in advance or just before the deadline. Either way, your bid is locked in once submitted. You cannot modify or cancel a noncompetitive bid after submission, so review carefully before clicking “Buy.”

Settlement and Funding

On the issue date, funds are deducted from your linked bank account. Settlement is typically same-day via Federal Reserve wire, meaning your T-bill position is secure and your cash is out of your account by end of business. Your TreasuryDirect account statement shows your position immediately.

At maturity, the $10,000 principal is deposited back into your bank account automatically. You have the option to reinvest in a new auction or let the funds sit in your account.

Tax Considerations

Treasury bill interest is subject to federal income tax but exempt from state and local income taxes. Report your interest income on Schedule D or the appropriate line of your tax return. If you hold the bill through the end of the calendar year before maturity, you’re still responsible for tax in the year you purchased it, not the year of maturity.

Cost and Security

TreasuryDirect charges no fees—neither for opening an account, placing bids, nor redeeming bills. Your holdings are backed by the full faith and credit of the U.S. government, making T-bills the safest short-term investment available to retail investors.

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