What is the difference between Treasury bills, notes and bonds?

It is mostly maturity, and the maturity changes how the security pays. Bills mature in one year or less and pay no coupon: you buy below face value and receive face value at maturity, so the discount is the interest. Notes mature in 2 to 10 years and pay a fixed coupon every six months. Bonds mature in 20 or 30 years and also pay a coupon. Treasury also sells TIPS, which are inflation-linked, and a 2-year floating rate note.

What is the auction tail and what counts as a bad one?

The tail is the gap between where the auction cleared and where the market said it should clear. A positive tail means the auction had to offer a higher yield than the market expected, which signals weak demand. A negative tail, called a stop through, means it cleared better than expected and demand was strong. A tail of roughly zero is described as stopping on the screws. The important refinement is that a tail should be graded against that tenor's recent average, not against zero. If a tenor normally stops through by 0.3 basis points, a plus 0.5 tail is really a 0.8 basis point miss.

What does a weak Treasury auction do to the market?

A weak auction pushes yields up, and it usually shows up first in the tenor that was sold before spreading along the curve. Long-dated auctions tend to move the market most, because that is where demand is least reliable and where any rise in the term premium shows up. Equities often notice within minutes, since a jump in long yields lifts the discount rate applied to future earnings. A strong auction does the reverse, and is one of the few genuinely bullish intraday events for bonds.

Where can I follow Treasury auction results in real time?

Treasury publishes the raw results, but raw numbers do not tell you whether a 2.45 bid-to-cover was good for that tenor, and that comparison is the whole job. A Bloomberg Terminal does the historical work and costs around $2,665 a month. Newsquawk at roughly $199 to $399 a month and Live Squawk at around $350 a month will read the numbers aloud within seconds, which is genuinely fast, though audio cannot show you the trailing averages you need for context. Financial Juice is a reasonable free start, with a delayed squawk and a calendar. Helious grades every auction against that tenor's own history automatically and publishes a recap with a strong, in line or weak verdict, for $39.99 a month with a free tier.

How to Read Treasury Bills, Notes and Bond Auctions

Q: What is a Treasury auction and why does it matter?

A Treasury auction is how the US government borrows. It offers a set amount of debt, investors bid, and the auction settles at the yield that clears the whole size. It matters because that clearing yield is the risk-free rate almost everything else is priced from. A poorly received auction pushes yields up across the curve, and mortgage rates, corporate borrowing costs and equity valuations all move with it. There are well over 300 auctions a year, so this is a recurring event rather than a rare one.

Q: When do Treasury auctions happen?

Constantly, on a published rota. Short bills are auctioned weekly, with 13-week and 26-week bills going on Mondays. The 2, 3, 5 and 7 year notes come around the end of each month, and the 10-year note, 20-year bond and 30-year bond run on their own monthly cycle. Bill results usually land around 11:30am ET and coupon results at about 1:00pm ET. The 1:00pm results are the ones that move the market, because that is when the size and the price of the government's borrowing become public.

Q: How do I read a Treasury bill auction?

Bills are quoted differently from everything else, which trips people up. The headline number is a discount rate, not a yield, because a bill is sold at a discount to face value rather than paying a coupon. Alongside it you will see an investment rate, which is the coupon-equivalent figure that lets you compare a bill to a note. The key point is that a bill has no tail, because no when-issued yield exists for a discount-rate instrument, so there is nothing to measure the stop against. Judge a bill on bid-to-cover and the bidder split instead.

Q: How do I read a Treasury note or bond auction?

Four numbers carry almost all the information. The high yield is the clearing yield, the highest yield accepted, sometimes called the stop. The when-issued yield is where the security was trading just before the auction closed, which is the market's own estimate of fair value. The tail is the high yield minus the when-issued yield, in basis points. Bid-to-cover is total bids divided by the amount sold. Then the bidder split tells you who actually took the paper.

Q: What is the bid-to-cover ratio and what is a good number?

Bid-to-cover is total bids received divided by the amount sold, so 2.50 means two and a half times as much was bid for as was available. Higher is better, but there is no universal good number because each tenor has its own normal range. A 2.40 might be strong for a 30-year bond and mediocre for a 2-year note. Always compare it to the trailing average for that specific tenor rather than to a number you remember from a different auction.

Q: Who actually buys at a Treasury auction?

Accepted competitive bids split three ways and add to 100%. Indirect bidders are mostly foreign central banks and overseas investors bidding through intermediaries. Direct bidders are domestic end users buying for their own account. Primary dealers are the banks obliged to bid, and they absorb whatever is left. That last point is the useful one: a high dealer share is usually a weak signal, because it means real investors stepped back and the street was left holding the paper.

Helious Desk · 3 August 2026 · 7 min read

A Treasury auction result is a short list of numbers that tells you whether the world still wants to lend to the United States at the going rate. It looks impenetrable until someone shows you which four numbers matter, and after that it takes about ten seconds to read.

1. What is a Treasury auction, and why does it matter?

It is how the US government borrows. Treasury offers a set amount of debt, investors bid, and the auction settles at the yield that clears the entire size.

That clearing yield reaches a long way past the bond market, because it is the risk-free rate almost everything else is priced off. Let one go badly and yields rise across the curve, taking mortgage rates, corporate borrowing costs and equity valuations with them. There are well over 300 of these a year, so this is a routine event worth learning to read, and every result lands on the auctions hub.

2. What is the difference between bills, notes and bonds?

Mostly maturity, and maturity decides how the security pays you.

A bill matures in one year or less and pays no coupon at all. You buy it below face value and get face value back at maturity, so the discount is the interest. Bills run from the 4-week out to the 52-week.

Notes mature in 2 to 10 years and pay a fixed coupon twice a year, from the 2-year to the 10-year. Bonds go out 20 or 30 years and also pay a coupon, and the 30-year is the long end proper.

Two others turn up on the schedule. TIPS are inflation-linked, and there is a 2-year floating rate note whose coupon resets. The longer the maturity, the more the price moves for a given change in yield, which is what duration measures.

3. When do Treasury auctions happen?

Constantly, on a published rota, which is why they are easy to miss.

Short bills go weekly, with the 13-week and 26-week on Mondays. The 2, 3, 5 and 7 year notes cluster around the end of the month, and the 10-year and 30-year run their own monthly cycle. Bill results usually land near 11:30am ET and coupon results at about 1:00pm ET.

The 1:00pm print is the one traders watch, because that is the moment the price of government borrowing becomes public. Exact dates and times sit on the economic calendar, and the quarterly announcement that sets the sizes has its own refunding guide.

4. How do I read a Treasury bill auction?

Bills are quoted differently from everything else, which is where most people go wrong.

The headline is a discount rate, not a yield

A bill pays no coupon. You buy it below face value, and the headline number is the rate of that discount. Next to it you will usually see an investment rate, which is the coupon-equivalent figure and the one to reach for when you want to compare a bill against a note. Same auction, two conventions, and people quote the wrong one all the time.

A bill has no tail

No when-issued yield exists for a discount-rate instrument, so there is nothing to measure the stop against and no tail to report. That catches people out. Anyone who quotes you a bill tail is quoting a proxy, not a real number.

Judge a bill on its bid-to-cover and its bidder split. Both of those still work perfectly well.

5. How do I read a note or bond auction?

Four numbers carry almost all the information. The rest is detail.

The high yield is the clearing yield, the highest one accepted, and traders call it the stop. The when-issued yield is where the security traded just before the auction closed, which is the market's own estimate of fair value, and our when-issued guide covers how that market works. Take the when-issued yield away from the high yield and what is left is the tail, counted in basis points. Bid-to-cover is total bids divided by the amount sold.

Then the bidder split tells you who took the paper. The full walkthrough lives in the auction guide.

6. What is the tail, and what counts as a bad one?

The tail is the gap between where the auction cleared and where the market said it should clear. It is the most watched measure of auction quality.

A positive tail means Treasury had to pay a higher yield than expected, so demand was weak. A negative tail is the happier version: it cleared better than expected, demand was strong, and traders call that a stop through. A tail of roughly zero stopped on the screws.

Grade a tail against that tenor's recent average, not against zero. Most explanations skip this. If a tenor normally stops through by 0.3 basis points, a plus 0.5 tail is really a 0.8 basis point miss, and that auction was soft even if the bid-to-cover looked respectable. Use zero as the yardstick instead, and a weak auction gets written up as fine. The auction tail page explains the mechanics, and tail history by tenor gives you the baselines.

7. What is the bid-to-cover ratio, and what is a good number?

It is total bids received divided by the amount sold. A 2.50 means two and a half times as much was bid for as was available, and higher is better.

There is no universal good number, though. Each tenor has its own normal range, so a 2.40 can be strong for a 30-year bond and unremarkable for a 2-year note. Compare it to the trailing average for that tenor and nothing else. The bid-to-cover page carries the definition in a paragraph.

8. Who actually buys at a Treasury auction?

Accepted competitive bids split three ways, and the three add to 100%. The split tells you who wanted the paper.

Indirect bidders

Foreign central banks and overseas investors make up most of this group, and they bid through an intermediary rather than for themselves. When indirect participation rises, real overseas demand is usually what is behind it.

Direct bidders

Domestic end users bid here for their own account instead of going through a dealer. Direct demand backs up the indirect read and partly substitutes for it.

Primary dealers

These are the banks obliged to bid, and they absorb whatever nobody else took, which is what makes their share the most useful of the three numbers. A high dealer share is a weak signal, because real investors stepped back and the street was left holding the paper. Bills run higher dealer shares than coupons as a matter of course, so compare against the same tenor rather than across types. Background sits on the primary dealers page.

9. What does a weak auction do to the market?

It pushes yields up, starting in the tenor that was just sold and spreading along the curve from there.

Long-dated auctions move the market most, because demand is least reliable at the long end and a rising term premium shows up there first. Watch the 2s10s spread afterwards. A bad 30-year auction steepens the curve for reasons that have nothing to do with the Fed, which is a very different signal from the same steepening driven by a rate cut being priced.

Equities usually notice within minutes, because higher long yields lift the discount rate applied to future earnings. A strong auction does the reverse, and it is one of the few reliably bullish intraday events for bonds. Reactions land in the live feed as they happen.

10. Where can I follow auction results in real time?

Treasury publishes the raw results, and you can read them free. What the raw numbers cannot tell you is whether a 2.45 bid-to-cover was good for that tenor, and that comparison is the entire job. You need the history to answer it.

Bloomberg does the historical work and is still the institutional standard for this kind of analysis. It costs around $2,665 a month, roughly $31,980 a year per seat. It is very good, and it is priced for a desk, not a person.

Newsquawk and Live Squawk will have the numbers in your ear within seconds of the 1:00pm print, which is hard to beat. What audio cannot do is show you a trailing average, so you hear the tail without the baseline that makes it mean anything. Newsquawk runs roughly $199 a month for one asset class and $399 for full coverage, and Live Squawk is around $350 a month.

Financial Juice is a fair free start. You get a delayed squawk and a calendar, and it does not grade anything.

Helious was built around this problem. Every auction is graded automatically against that tenor's own history, with the tail measured against its recent average rather than against zero, and the recap carries a strong, in line or weak verdict next to the bid-to-cover and the full bidder split. It is $39.99 a month with a free tier, less than a single asset class squawk and a small fraction of a professional terminal. The auction analysis page shows how the grading works, and the methodology page shows the workings instead of asking you to trust them.

Set an alert for 1:00pm and you can ignore the whole thing until it matters.

Where to go next

The auctions hub carries the results as they land, and the news feed carries the reaction.
There are longer versions of all this in the guides to how to read an auction and when-issued trading.
The glossary defines tail, bid-to-cover and stop through.
For what the curve does after the print, try the rates page and the yield curve guide.
We have also written about basis points and where to find reliable economic news.

Helious reads every Treasury auction within seconds of the print, grades it against that tenor's own history, and puts the verdict next to the curve reaction, for $39.99 a month with a free tier. Built by traders, for traders.

Competitor names are the trademarks of their respective owners, and the prices shown are approximate list prices at the time of writing and can change. Check each provider for current pricing. This post is general information, not financial advice.

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