Treasury Auctions: How the US Sells Its Debt

How a Treasury auction works

Every marketable Treasury security is first sold at auction. TreasuryDirect describes four steps.

1. Announcement. Treasury announces the security, the amount offered, the auction date, the issue and maturity dates, and the closing times for bids.
2. Bidding. Non-competitive bidders agree to accept whatever yield the auction sets, up to $10 million per auction. Competitive bidders state the yield (or, for bills, the discount rate) they will accept, and one bidder can win at most 35% of the offering. For recent note and bond auctions, non-competitive bids closed at noon and competitive bids at 1:00 pm Eastern time.
3. The auction. Treasury fills all valid non-competitive bids first. It then accepts competitive bids from the lowest yield upward until the full amount is sold.
4. Issue. On the issue date, often days or weeks later, the buyer pays and receives the securities.

Every auction is single-price. All winning bidders receive the same yield, the highest one Treasury had to accept, known as the high yield. Bids at exactly that yield are filled pro rata. At the two-year note auction on 26 October 2026, bids at the high yield of 4.708% received 80.83% of the amount they asked for.

Anyone can bid. Individuals can bid non-competitively through a TreasuryDirect account; competitive bids must go through a bank, broker or dealer.

Bills, notes and bonds

Treasury sells five kinds of marketable security, and the difference between them is mainly maturity and how interest is paid.

Many auctions are reopenings: Treasury sells more of an existing security, with the same maturity date and coupon, rather than creating a new one. The 10-year note sold on 7 October 2026, for example, was a reopening of the note first auctioned in August.

Bills dominate by volume because they roll over so often. Treasury Fiscal Data records 436 auctions in fiscal 2026 with $31.28 trillion offered. Bills accounted for $26.88 trillion of that, 86%. Notes, bonds, TIPS and floating rate notes made up the remaining $4.40 trillion. Most of the bill total replaces bills that matured weeks earlier, which is why gross auction volume is many times larger than the year's $1.99 trillion deficit.

Recent auction sizes and results

Auction sizes in October 2026, from TreasuryDirect and Treasury Fiscal Data:

• Bills: 4-week $110 billion, 8-week $105 billion, 6-week and 13-week $95 billion each, 26-week $82 billion, 17-week $75 billion, 52-week $54 billion.
• Notes: 2-year $69 billion, 5-year $70 billion, 3-year $58 billion, 10-year $39 billion as a reopening ($42 billion for the new issue in August), and 7-year $44 billion at the most recent sale in September.
• Bonds: 30-year $22 billion and 20-year $13 billion as reopenings ($25 billion and $16 billion for the August new issues).

The 10-, 20- and 30-year sales in the table were reopenings of securities first issued in August. The same auctions, by who won them:

Shares are percentages of the competitive amount awarded. Yields moved fast over the period. The 10-year reopening cleared at 5.300% on 7 October, against 4.834% a month earlier, and the 30-year at 5.618%, against 5.308%.

Who bids: dealers, directs and indirects

Treasury's results sort competitive winners into three groups.

• Primary dealers. The 25 banks and broker-dealers on the New York Fed's list. They are expected to bid on a pro-rata basis in every Treasury auction at reasonably competitive prices. In practice they absorb whatever end investors do not bid for at competitive yields.
• Direct bidders. Any other institution bidding for its own account straight into Treasury's system: funds, insurers, banks, pension funds, and foreign institutions that have direct access.
• Indirect bidders. Customers placing bids through a primary dealer or direct submitter. Foreign central banks bidding through the New York Fed are counted here, which is why the indirect share is often read as a gauge of foreign demand. Treasury warns that the category does not indicate whether the bidder is foreign or domestic.

Two more participants sit outside the competitive auction. The Federal Reserve's System Open Market Account can be awarded securities outside the offering amount: it took $7.67 billion of the 26 October two-year notes on top of the $69 billion offered. And individuals buying through TreasuryDirect or a broker bid non-competitively; Treasury Retail received $439 million at the same auction. For the full picture of who ends up holding the debt, see who owns US debt.

Reading the results: bid-to-cover, tails and dealer share

Bid-to-cover ratio. Total bids received divided by the amount awarded, excluding the Fed's add-on. A ratio of 2.5 means $2.50 was bid for every dollar sold. It is best compared with the same security's recent history. Across the 13 ten-year note auctions from October 2025 to October 2026, the ratio averaged 2.53, ranging from 2.39 in February 2026 to 2.77 on 7 October 2026.

High, median and low yields. Treasury publishes all three. The high yield is what every winner receives. The median is the yield at which half the accepted competitive amount had been reached. A wide gap between them means Treasury had to reach well up the bid stack to sell the full amount.

Tail. The term has two common definitions. Treasury's own charts define the tail as the yield set at the auction minus the yield in when-issued trading, so a positive tail means the auction sold the security more cheaply than the market was pricing it. A New York Fed staff report uses the spread between the high and median yields. Treasury's published results do not include when-issued yields, so tails on the first definition come from market data. On the second definition, the 23 September 2026 five-year auction showed 8.3 basis points (5.033% high against 4.950% median); the 7 October ten-year showed 4.5.

Dealer share. The portion primary dealers were left holding. A high share means end investors bid less than usual at the clearing yield. From October 2025 to October 2026, dealers took an average of 8.9% of competitive awards at ten-year note auctions and 12.2% at five-year auctions.

Why weak auctions make news

An auction is the moment the Treasury finds out what it must pay to borrow. Secondary-market yields move all day, but the auction result is the rate locked in on new debt for years or decades. With $31.28 trillion offered in fiscal 2026, small changes in auction yields carry large costs. Net interest reached $1.05 trillion in fiscal 2026, and the average rate on marketable Treasury debt was 3.52% in September 2026. Nominal notes and bonds sold in October at 4.7% to 5.6% pull that average up as they replace older, cheaper debt. Our guide to US interest costs follows that line in the budget.

A weak auction usually shows several signs at once: a lower bid-to-cover than the security's recent average, a high yield well above the median or the when-issued level, and a larger share left with dealers. The five-year sale on 23 September 2026 showed all three on the measures Treasury publishes. Its 2.21 bid-to-cover was the lowest, and its 15.8% dealer share the highest, of the twelve five-year note auctions from October 2025 to September 2026, and its high yield sat 8.3 basis points above the median.

Strong demand does not guarantee a low yield. The 7 October ten-year auction had the highest bid-to-cover of the 13 ten-year sales since October 2025, an 80.3% indirect share and only 2.5% left with dealers, and it still cleared at 5.300%. Bid-to-cover and bidder shares measure appetite at the prevailing level of yields. That level is set mostly in the wider market, by expectations for inflation, Fed policy and the supply of debt; our guide to why Treasury yields rise covers those forces.

Supply is announced in advance. Treasury sets out its auction plans at quarterly refunding press conferences, usually on the first Wednesday of February, May, August and November, and normally gives a tentative schedule for the next six months.