What Is Treasury Yield? Definition and Economic Impact

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A Treasury yield is the annual rate of return an investor earns by lending money to the U.S. government through its debt securities: Treasury bills, notes and bonds. It is quoted as an annualized percentage, so a 4% yield on a 3-month bill means the bill earns at a rate of 4% per year, not 4% over its three-month life. Because Treasuries are backed by the full faith and credit of the U.S. government, their yields serve as the baseline “risk-free” rate against which mortgages, corporate bonds, auto loans and even stock valuations are measured.

How Treasury Yield Works

When the federal government needs to borrow, the U.S. Treasury sells debt securities at auction. They fall into three groups by maturity:

• Treasury bills (T-bills) mature in one year or less.
• Treasury notes (T-notes) mature in more than one year and up to 10 years.
• Treasury bonds (T-bonds) mature in 20 or 30 years.

Notes and bonds pay a fixed interest payment, called a coupon, every six months, and they return the face value (par) at maturity. Bills pay no coupon. They are sold below face value and redeemed at par, and the difference is the investor’s interest.

After auction, Treasuries trade continuously in the secondary market. Their prices change, but the government’s payments do not: a note with a $30 annual coupon pays $30 a year whatever it trades for. Pay less than par for those fixed payments and the return on the money invested rises. Pay more and it falls. That is why yield and price move inversely, and why traders quote Treasuries by yield.

Coupon rate vs. yield

The coupon rate and the yield are often confused. The coupon rate is fixed when the security is issued and determines the dollar interest paid. The yield is the return a buyer earns at the current market price.

• Bought at par, the yield equals the coupon rate.
• Bought at a discount, the yield is higher than the coupon rate.
• Bought at a premium, the yield is lower than the coupon rate.

Calculating Treasury Yield

Bills and coupon securities use different formulas because they pay interest differently.

Treasury bill yields

The Treasury uses two methods for bill yields.

The discount yield expresses the dollar discount as a percentage of face value and annualizes it on a 360-day year. Bills are quoted this way in the secondary market.

Hypothetical example: a 90-day bill with a $10,000 face value bought for $9,950.

Discount yield = [(10,000 − 9,950) / 10,000] × (360 / 90) = 0.02, or 2.00%

The investment yield (also called the bond-equivalent or coupon-equivalent yield) measures the return against the purchase price and uses the actual calendar year, normally 365 days (366 in a leap year).

Investment yield = [(10,000 − 9,950) / 9,950] × (365 / 90) ≈ 0.0204, or 2.04%

The investment yield better reflects what the buyer earns, because the buyer paid $9,950, not $10,000. It also lets a bill be compared fairly with a coupon note or bond maturing on the same date. The discount yield always understates the investment yield for the same bill.

Treasury note and bond yields

For notes and bonds held to maturity, a common approximation combines the annual coupon with the gain or loss from buying away from par, spread over the years remaining:

Yield ≈ [C + (FV − PP) / T] ÷ [(FV + PP) / 2]

where C is the annual coupon in dollars, FV is face value, PP is purchase price and T is years to maturity.

Hypothetical example 1 (discount): a 10-year note with a $1,000 face value and a 3% coupon ($30 a year) falls in price to $974.80 right after issue.

Yield ≈ [30 + (1,000 − 974.80) / 10] ÷ [(1,000 + 974.80) / 2] = 32.52 ÷ 987.40 ≈ 3.3%

If the same note instead rose to $1,026, the yield for a new buyer would fall to roughly 2.7%.

Hypothetical example 2 (premium): a 10-year note with a $10,000 face value and a 3% coupon ($300 a year), bought for $10,300 with 10 years remaining.

Yield ≈ [300 + (10,000 − 10,300) / 10] ÷ [(10,000 + 10,300) / 2] = 270 ÷ 10,150 ≈ 2.66%

The premium buyer collects the same $300 coupons but loses $300 of principal by maturity, so the return falls below 3%. The formula assumes the security is held to maturity. The exact figure, which accounts for semiannual compounding and payment timing, is the yield to maturity.

What Moves Treasury Yields

At auction and in the secondary market, yields are set by supply and demand. Several forces shift that balance.

Federal Reserve policy. When the Fed raises its target for the federal funds rate (the rate banks charge each other for overnight loans), or investors expect it to, yields tend to rise and existing Treasury prices fall. The effect is strongest at short maturities, where a 3-month bill competes directly with overnight and short-term cash rates. Fed purchases or sales of Treasuries also affect demand, particularly for longer maturities.

Inflation expectations. Fixed payments lose purchasing power when prices rise, so investors demand higher yields when they expect more inflation. This is why long-term yields often climb on hotter-than-expected inflation reports.

Economic growth. Strong growth tends to raise yields as investors anticipate tighter policy and move money into riskier assets. Expectations of a slowdown tend to pull long-term yields down.

Supply of debt. Larger budget deficits mean the Treasury must sell more securities. If demand does not keep pace, yields rise to attract buyers. This is the main channel through which government spending can affect Treasury yields.

Safe-haven demand. During market stress, investors often buy Treasuries for safety and liquidity, which pushes prices up and yields down.

Term premium. Investors may demand extra yield simply for tying up money for decades and bearing the risk that rates or inflation surprise them. This compensation can rise or fall independently of rate expectations.

What a rising 30-year Treasury yield means

The 30-year bond’s yield is the least tied to current Fed policy and the most driven by long-run expectations. When it rises, the market is demanding more to lend for three decades, usually because of higher expected inflation, expectations that rates will stay elevated, concern about the volume of federal borrowing or a higher term premium. Existing holders lose: long bonds have the highest duration, so a given rise in yield cuts their price more than it cuts the price of a shorter note.

The Yield Curve

Plotting yields across maturities, from bills out to 30-year bonds, produces the yield curve. Normally it slopes upward: longer maturities yield more because they carry more duration risk, the risk that rising rates will reduce the bond’s market value before it matures.

The shape changes with the economic outlook. When the Fed hikes, short-term yields have historically tended to rise faster than long-term ones, because the long end prices in the slower growth that tighter policy is expected to cause. If short-term yields climb above long-term yields, the curve is inverted. The widely watched comparison of the 10-year note with the 2-year note has inverted before most U.S. recessions, though it has also produced false signals and does not indicate when a downturn might begin.

Why Treasury Yields Matter

A benchmark for other borrowing. Mortgage rates tend to move with the 10-year Treasury yield, and corporate bonds are often quoted as a spread over the Treasury of the same maturity. That spread compensates investors for the credit risk of lending to a company instead of the U.S. government.

A hurdle rate for other assets. As the lowest-risk investment, Treasuries set a floor that riskier assets must beat. Higher yields raise the discount rate used to value future corporate earnings, which can weigh on stock valuations, including those in the S&P 500. The Sharpe ratio uses a Treasury bill yield as the risk-free rate.

Effects on banks. Banks typically fund themselves with short-term deposits and lend or invest for longer terms, so a steeper curve can widen their lending margins. Rising yields also reduce the market value of Treasuries banks already hold, and in 2023 losses on such holdings contributed to the failure of Silicon Valley Bank.

Is a Higher or Lower Treasury Yield Better?

Neither is better in general. The answer depends on your position:

• New buyers and savers benefit from higher yields, because they lock in more income on bills, notes and money-market-type holdings.
• Existing bondholders benefit from falling yields, because the prices of the bonds they own rise.
• Borrowers generally prefer lower yields, because mortgages and other loans priced off Treasuries become cheaper.
• The government pays more interest on new debt when yields are higher.

For the broader economy, very high yields can slow growth by raising borrowing costs, while very low yields can reflect weak growth expectations. Rising long-term yields tend to cool demand, but a rise driven by inflation fears is a symptom of the problem, not a cure.

Limitations and Common Confusions

A quoted yield is not a guaranteed return. The yield you see assumes the security is held to maturity. Sell early after yields rise and you can realize a loss, even on a Treasury. The approximation formula and yield to maturity also assume coupons can be reinvested at the same rate.

Nominal vs. real. Standard Treasury yields are nominal. Your real return is the yield minus inflation, and it can be negative. Treasury Inflation-Protected Securities (TIPS) are the Treasury’s inflation-adjusted alternative.

Bond yields vs. Treasury yields. “Bond yield” is the general term for the return on any bond. Treasury yields are the subset issued by the U.S. government, and most other bond yields sit above them because of added credit risk.

Fund yields differ from security yields. A Treasury ETF or index fund holds many securities and never matures as a whole. Its price falls when yields rise, by an amount that depends on its duration, and its return is not locked in the way a single held-to-maturity note’s is.

Taxes and How Interest Is Paid

Treasury interest, including the discount earned on bills, is subject to federal income tax but exempt from state and local income taxes. That makes Treasuries relatively more attractive in high-tax states compared with bank deposits or corporate bonds. Municipal bonds work differently: their interest is generally exempt from federal tax and sometimes from state tax.

If you buy directly from the government, interest is paid into your TreasuryDirect account. If you hold Treasuries at a brokerage, payments go to your brokerage account.

FAQs

The Bottom Line

Treasury yields matter to savers, bondholders, borrowers and stock investors because mortgages, corporate bonds and asset valuations are priced against them. Higher yields help new buyers lock in income, while falling yields lift the prices of bonds already held. A quoted yield assumes the security is held to maturity, so selling early after yields rise can produce a loss even on a Treasury.