Bond prices and yields move in opposite directions—but “yield” is not a single number.
The same bond can be described by a coupon rate, a current yield, a yield to maturity, and an expected real yield. These measures can differ because each answers a different question: what the bond promises to pay, how much income its current price provides, what return it implies if held to maturity, or how much purchasing power that return may represent after inflation.
That distinction matters whenever you compare bonds or read a quoted yield. Before asking whether a yield looks attractive, you first need to know which yield you are looking at.
Coupon Rate: What the Bond Promises
The coupon rate is the bond’s stated annual interest rate, expressed as a percentage of its face value.
Coupon Rate = Annual Coupon Payment ÷ Face Value
A $1,000 bond paying $50 per year has a coupon rate of 5%. For a conventional fixed-rate bond, that rate is set when the bond is issued and does not change simply because its market price later rises or falls.
What the coupon rate does not tell you is the return available to someone buying the bond in the secondary market, where its price may be above or below face value.
Current Yield: Income Relative to Today’s Price
Current yield adjusts the bond’s annual coupon payment for the price an investor would pay today.
Current Yield = Annual Coupon Payment ÷ Current Market Price
Take a bond with a $1,000 face value, a 5% coupon rate paying $50 per year, and 10 years remaining until maturity. Suppose market yields have risen since the bond was issued, and it now trades at $950.
Coupon rate: $50 ÷ $1,000 = 5.00%
Current yield: $50 ÷ $950 = 5.26%
Because you are paying less than face value, the same $50 annual coupon represents a higher rate of income relative to the price you paid.
But current yield still leaves something important out. If you buy the bond for $950, hold it to maturity, and the issuer makes its payments as promised, you are scheduled to receive $1,000 at maturity. Current yield ignores that $50 difference between the purchase price and the principal repayment.
That is why current yield gives a better picture of current income than the coupon rate, but it still does not capture the bond’s full return if held to maturity.
Yield to Maturity: The Hold-to-Maturity Measure
Yield to maturity (YTM) estimates the annualized return implied by a bond’s current price if you hold it to maturity and the issuer makes all scheduled coupon and principal payments as promised.
Unlike current yield, YTM takes into account both the bond’s coupon payments and any difference between the price you pay and the principal you are scheduled to receive at maturity.
Using the same example—a $950 purchase price, $50 annual coupon, $1,000 face value, and 10 years remaining until maturity—the YTM is approximately 5.7%.
That yield reflects more than the $50 of annual coupon income. Because you bought the bond for $950 and are scheduled to receive $1,000 at maturity, the calculation also incorporates the $50 difference between the purchase price and principal repayment.
Mathematically, YTM is the discount rate that makes the present value of the bond’s future coupon and principal payments equal its current market price.
Three relationships are worth remembering:
- Discount: When a fixed-rate bond trades below face value, its YTM is higher than its current yield because the calculation includes the gain between the purchase price and principal repayment.
- Premium: When a fixed-rate bond trades above face value, its YTM is lower than its current yield because the investor pays more than the principal scheduled to be returned at maturity.
- Par: When the bond trades at face value, its YTM equals its coupon rate.
YTM is therefore a much more useful measure than coupon rate or current yield when you want to compare the return implied by bonds with different market prices and maturities. It is still an implied hold-to-maturity return, not a guaranteed realized return: selling early, missed payments, reinvestment conditions, or other bond features can change what an investor actually earns.
A note on callable bonds. Some corporate and municipal bonds allow the issuer to repay the bond before maturity. For these securities, yield to call (YTC) estimates the return if the bond is redeemed on a specified call date rather than held to maturity. Investors may also look at yield to worst (YTW), which identifies the lower yield among the applicable maturity and call scenarios and provides a more conservative view of the bond’s potential return.
Real Yield: What Remains After Inflation
A nominal bond yield tells you how your money grows in dollars. Real yield asks a different question: how much purchasing power that return may provide after inflation.
For a nominal bond, a useful approximation is:
Expected Real Yield ≈ Nominal Yield − Expected Inflation
If a bond offers a 5% nominal yield and investors expect inflation of 4%, its expected real yield is roughly 1%. The bond may still increase your number of dollars, but inflation reduces how much additional purchasing power those dollars represent.
This distinction becomes especially important when inflation is high. In 2021, U.S. consumer prices rose 7.0% over the year. In an environment like that, a nominal yield can look positive while still providing little or negative purchasing-power growth.
The Treasury also issues Treasury Inflation-Protected Securities (TIPS). Unlike conventional Treasury securities with fixed principal, the principal value of TIPS adjusts with the Consumer Price Index. Their interest rate is fixed, but the dollar interest payment changes because it is applied to the inflation-adjusted principal.
TIPS yields are therefore quoted as real yields. If a 10-year TIPS is trading at a 2% real yield, that yield is expressed above the inflation adjustment built into the security rather than requiring investors to subtract an inflation estimate from a nominal Treasury yield.
One Bond, Four Measures
Using the same bond throughout makes the differences easier to see.
Face value: $1,000
Annual coupon: $50 (5% coupon rate)
Market price: $950
Maturity: 10 years
Expected inflation: 3%
| Measure | Calculation | Result |
|---|---|---|
| Coupon Rate | $50 ÷ $1,000 | 5.00% |
| Current Yield | $50 ÷ $950 | 5.26% |
| Yield to Maturity | Discount rate incorporating remaining coupon and principal payments | ~5.7% |
| Expected Real Yield | YTM − expected inflation | ~2.7% |
Which Yield to Use and When
The right measure depends on the question you are trying to answer.
Coupon rate tells you the bond’s scheduled annual interest payment relative to face value. It is useful for understanding the bond’s promised cash flow, but it does not tell you the return available at today’s market price.
Current yield tells you how much annual coupon income the bond provides relative to the price you would pay today. It is useful when you want to compare current income, but it ignores any gain or loss between the purchase price and the principal repaid at maturity.
Yield to maturity is usually the better starting point when comparing conventional bonds that you may hold to maturity because it incorporates the current price, remaining coupon payments, and principal repayment.
Expected real yield adds the purchasing-power perspective. A nominal yield can look attractive, but expected inflation determines how much of that return may remain in real terms.
No single yield measure answers every question. The useful habit is to identify what the measure includes—and what it leaves out—before using it to compare bonds.
Sources and Further Reading
FINRA — Understanding Bond Yield and Return
U.S. TreasuryDirect — Treasury Inflation-Protected Securities (TIPS)
U.S. Bureau of Labor Statistics — Consumer Price Index: 2021 in review