Bond Yield vs. Coupon Rate: What's the Difference?
By Markets & Investing DeskUpdated Nov 10, 2026
Key takeaways
- Current yield equals the annual coupon divided by the price, so a 6% bond bought at $800 yields 7.5%.
- A bond trades at a premium when its coupon exceeds its yield and at a discount when the coupon is lower.
- Yield to maturity adds the gain or loss from repayment at par, lifting the $800 bond's rough YTM to about 8.9%.
- Floating-rate, zero-coupon and callable bonds change the usual link between coupon rate and yield.
A bond’s coupon rate is the fixed annual interest the issuer pays, stated as a percentage of the bond’s face (par) value. Its yield is the return an investor earns based on the price actually paid for the bond. The coupon rate is set at issuance and, for a fixed-rate bond, never changes. Yield moves every time the bond’s market price moves. The two are equal only when the bond trades exactly at par.
Why the Coupon Rate Stays Put and Yield Moves
When a bond is issued, its coupon rate is generally set close to prevailing market interest rates. A $1,000 bond with a 6% coupon pays $60 a year, split into scheduled payments (often semiannual), until maturity. That $60 is locked in regardless of who owns the bond or what they paid for it.
Market rates keep moving after issuance, though. Suppose new bonds of similar quality start paying 7%. Nobody will pay $1,000 for an old bond paying $60 when a new one pays $70, so the old bond’s price must drop until its return competes. The coupon payment hasn’t changed; the price has, and so has the yield. The reverse happens when rates fall: older bonds with higher coupons become more valuable and their prices rise.
Coupon Rate vs. Interest Rate
The coupon rate is an interest rate, but only the bond’s own contractual one, measured against face value. “Interest rate” in the broader sense usually means prevailing market rates, which shift with central bank policy, inflation expectations and credit conditions, and reach a fixed-rate bond only through its price and yield.
How to Calculate Each
- Coupon rate = annual coupon payment ÷ face value
- Current yield = annual coupon payment ÷ current market price
Example: The Same Bond at Three Prices
Take a bond with a $1,000 face value and a 6% coupon, paying $60 a year (hypothetical figures for illustration).
| Purchase price | Annual coupon | Current yield | Trades at |
|---|---|---|---|
| $1,000 | $60 | 6.0% | Par |
| $800 | $60 | 7.5% | Discount |
| $1,200 | $60 | 5.0% | Premium |
Buying at $800 lifts the current yield to 7.5% because the same $60 is a larger share of a smaller outlay.
You can also work backward. At what price would this bond yield 7% on a current-yield basis? Divide the coupon by the target yield: $60 ÷ 0.07 = about $857.14. (Hitting a 7% yield to maturity would require a different price, which depends on how many years remain until maturity.)
Yield to Maturity: The Measure That Counts the Price Gap
Current yield ignores one thing: a bond bought below par repays its full $1,000 face value at maturity, producing a gain, and a bond bought above par produces a loss. Yield to maturity folds that gain or loss into the annual return, assuming you hold to maturity and receive every payment.
A common shortcut gives a rough YTM:
Approximate YTM = [annual coupon + (face value − price) ÷ years to maturity] ÷ [(face value + price) ÷ 2]
Assume the $800 bond above has 10 years left. The approximation is ($60 + $200 ÷ 10) ÷ $900 = $80 ÷ $900, or about 8.9%. That figure sits well above the 7.5% current yield because it includes the $200 pull toward par. Exact YTM is solved iteratively, which is why calculators and bond quotes are typically used.
Premium and Discount: Reading the Relationship
The comparison between coupon and yield tells you immediately where a bond trades relative to par:
- Coupon higher than yield: the bond trades at a premium. Its fixed payments beat what the market currently offers, so buyers pay extra for them.
- Coupon lower than yield: the bond trades at a discount, compensating buyers for below-market payments.
- Coupon equal to yield: the bond trades at par.
A premium bond is not automatically a bad buy, nor a discount bond a bargain. Their yields already reflect the price; the difference lies in how the return is delivered (more through coupons versus more through price gain at maturity), which can matter for cash flow needs and taxes.
Exceptions That Change the Answer
- Floating-rate bonds reset their coupon periodically to a benchmark rate, so the coupon rate itself changes over time.
- Zero-coupon bonds pay no coupon at all. They are sold at a discount, and their entire return comes from the gap between price and face value.
- Callable bonds can be redeemed early by the issuer. For these, yield to call and yield to worst (the lowest yield across possible call dates and maturity) can matter more than YTM, especially when the bond trades at a premium.
- Other yield conventions include bond equivalent yield (BEY) and effective annual yield, which differ in how they annualize and compound returns. When comparing bonds, make sure the quotes use the same measure.
The Risks
Yield figures assume the issuer pays on time. A bond with an unusually high yield relative to its coupon may be priced low because the market sees credit risk, not just because rates rose. YTM also assumes you hold to maturity; selling early exposes you to whatever price the market offers then. Rising inflation erodes the real value of fixed coupons, one reason prices of existing bonds fall when inflation expectations climb.
FAQs
Do bonds have an APY?
Bond returns are usually quoted as a yield such as YTM or current yield rather than as APY, which is more common for bank deposits. APY-style measures (effective annual yield) account for compounding of semiannual payments, so they can come out slightly higher than a quoted bond yield.
The Bottom Line
Anyone buying bonds on the secondary market should judge them by yield rather than coupon, since the price paid sets the actual return. Comparing bonds works only when the quotes use the same yield measure, and callable bonds call for checking yield to worst. An unusually high yield can signal credit risk, and selling before maturity leaves the outcome to the market price at that time.
