What it means
In bond markets, short codes save time, so a ten-year Treasury note is often written as UST 10Y. Traders quote its yield, the annual return from holding it, as a headline number.
The 2-year, 10-year and 30-year are the most commonly followed points on the curve. Treasuries are seen as the safest securities available in dollars because they are backed by the government.
Their yields form the base for pricing all other dollar debt, which is why you will see corporate bonds quoted as a spread over UST. A bond priced at 150 basis points over the ten-year UST yields 1.5 percentage points more than the Treasury.
The price and yield move in opposite directions. When yields rise, the price of an existing UST falls, because new bonds pay more and old ones become less attractive.
This matters to banks and funds that hold large portfolios, as rising rates can cause paper losses on their holdings. Corporate finance teams watch UST yields for planning.
A rise in the yield on the five-year UST usually means higher fixed-rate borrowing costs for a business, while a fall may make refinancing more attractive. Analysts also use UST yields as the risk-free rate when valuing companies.
Be careful with the other meaning. TerraUSD, ticker UST, was an algorithmic stablecoin meant to hold a value of one dollar, which lost that peg in May 2022 and fell close to zero.
When you read UST in cryptocurrency articles, it usually refers to that token, and in traditional finance it means the Treasury security. Traders also quote UST yields in basis points, where one basis point is one hundredth of a percentage point.
A move of 25 basis points is a move of 0.25 percentage points. This shorthand keeps trading conversations quick and avoids confusion over small differences.
In practice
Real-world examples.
Example
A bank's treasury desk reads a morning note saying the 10Y UST yield rose by 0.15 percentage points overnight. The desk expects the value of its bond portfolio to fall and checks its risk limits. She adds that a one-day move of that size is large enough to deserve a note to the risk committee.
Example
A manufacturer plans to issue a five-year bond. Its bankers quote a price of 120 basis points over the five-year UST, and the finance team uses that to estimate the interest cost. If the UST yield moves before pricing, the interest cost moves by the same amount, so the team monitors it daily.
Example
A pension fund holds a large portfolio of long dated UST bonds to match its future payments. When yields rise, the market value of the bonds falls, but the fund's liabilities also fall. The fund's actuary therefore watches the funded ratio rather than the market price alone.
Formula
Calculation
Current yield = annual coupon payment / market price
Suppose a Treasury note has a face value of $100,000 and pays a 4% coupon, so the annual payment is 100,000 x 0.04 = $4,000. If the note trades at a market price of $98,000, the current yield is 4,000 / 98,000 = 0.0408, or about 4.08%. The yield is higher than the 4% coupon because the investor pays less than face value for the same payments. The yield to maturity would be higher still, since the bond also pays back $100,000 at maturity.Case study
Seen in the real world.
Lakeshore Capital is an illustrative, fictional investment firm that holds $50,000,000 in ten-year Treasury notes for a client's reserve fund. During one quarter, the UST yield rises from 4.0% to 4.5%, and the fund's market value falls by about 3.5%.
The portfolio manager explains to the client that the loss is on paper and the notes will pay their full face value at maturity. She also points out that new money invested now earns a higher yield than before.
In this illustrative story the client chooses to hold the notes and reinvest the coupons at higher yields. The lesson is that the same rise in yield that reduced market value also improves future income.
Watch out
Common mistakes.
- Reading UST in a crypto article as a Treasury security, when it may refer to the TerraUSD stablecoin.
- Believing UST prices cannot fall, when they fall whenever yields rise and an investor sells before maturity.
- Quoting a UST spread without specifying the maturity, when the spread must be measured against the Treasury of a similar life.
Questions
People also ask.
What does UST 10Y mean?
It means the US Treasury note with a ten year maturity, whose yield is a widely followed benchmark.
Why do corporate bonds quote a spread over UST?
Because UST yields are treated as the risk-free base, and the spread shows the extra return investors demand for taking credit risk.
Is a UST the same as a gilt or a bund?
No, those are the equivalent government bonds of the United Kingdom and Germany.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related