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Coupon Rate vs Yield: Key Differences Explained
The coupon rate is the fixed interest payment a bond promises. The yield is the actual return a buyer earns given the price they pay today. The two are almost never equal once a bond trades in the secondary market.
Key Takeaways
- The coupon rate is fixed at issuance; yield changes every time the bond's market price changes.
- A bond trading below par has a current yield above its coupon rate and a YTM above its current yield.
- Yield to maturity, not coupon rate, is the correct metric for comparing bonds bought at different prices.
- For floating-rate bonds, the coupon resets periodically, narrowing the gap between coupon rate and yield.
Key Takeaways
- The coupon rate is fixed at issuance; yield changes every time the bond's market price changes.
- A bond trading below par has a current yield above its coupon rate and a YTM above its current yield.
- Yield to maturity, not coupon rate, is the correct metric for comparing bonds bought at different prices.
- For floating-rate bonds, the coupon resets periodically, narrowing the gap between coupon rate and yield.
What It Is
The coupon rate is set at issuance and printed on the bond. It is expressed as an annual percentage of face value and does not change over the life of a standard fixed-rate bond. A 5 percent coupon on a $1,000 face value pays $50 per year, usually as two $25 semi-annual payments.
Yield is a present-tense measurement. It answers: given what this bond costs today and what it will pay going forward, what return will I earn? Because bond prices move with market rates, the yield moves too, even though the coupon is locked.
There are several flavors of yield. The simplest is current yield, which divides the annual coupon by the current price. The most complete is yield to maturity, which accounts for every future cash flow plus the return of principal at maturity.
The Intuition
Think of the coupon as the bond's nameplate horsepower and the yield as the car's actual top speed under current conditions. The engine does not change. The road does. When interest rates rise after issuance, the bond looks less attractive compared to new issues, so its price drops and its yield to a new buyer rises. When rates fall, the bond becomes more valuable, price rises, and yield to a new buyer falls.
This is why seasoned bond investors care about yield, not coupon. The coupon tells you what the issuer contracts to pay. The yield tells you what you will actually earn.
How It Works
Three scenarios cover every fixed-rate bond.
Price = par (100) --> current yield = coupon rate = YTM
Price < par (discount) --> current yield > coupon rate, YTM > current yield
Price > par (premium) --> current yield < coupon rate, YTM < current yield
The basic formulas:
Annual coupon payment = coupon rate * face value
Current yield = annual coupon payment / current market price
Yield to maturity is the discount rate that equates the present value of all future coupons and the face value repayment to the current price. It has no closed-form solution and is solved numerically, but all bond calculators and platforms compute it.
For a premium bond, YTM is lower than current yield because the buyer paid more than par and will receive only par at maturity. That capital loss at maturity pulls total return below the coupon yield. For a discount bond, YTM is higher than current yield because the buyer gains the pull to par at maturity on top of the coupons.
Worked Example
A 10-year corporate bond was issued with a 4 percent coupon and $1,000 face value. Three years later, market yields on comparable bonds have risen, and this bond now trades at $920.
- Annual coupon payment: 4 percent of $1,000 = $40
- Coupon rate: still 4 percent, unchanged
- Current yield: $40 / $920 = 4.35 percent
- Yield to maturity: roughly 5.1 percent, because the buyer also picks up the $80 pull to par over seven remaining years
A different buyer purchases the same bond a year later at $1,050 after rates fell.
- Coupon rate: still 4 percent
- Current yield: $40 / $1,050 = 3.81 percent
- Yield to maturity: roughly 3.1 percent, because the $50 premium is amortized against the remaining coupons
Same bond, same issuer, same coupon. Three very different yields depending on purchase price.
Common Mistakes
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Quoting coupon rate as the bond's return. New investors often compare two bonds by coupon alone. A 6 percent coupon bond trading at $1,150 delivers a lower yield to maturity than a 4 percent coupon bond trading at par. What the issuer promised to pay is not what you earn if you paid above par to buy it.
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Ignoring current yield vs yield to maturity. Current yield is a quick snapshot. It ignores the pull to par at maturity, reinvestment, and the time value of money. For short holding periods it is a decent approximation. For a 20-year bond held to maturity, it is misleading.
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Forgetting that floating-rate bonds reset the coupon. This article assumes a fixed coupon. Floating-rate notes recalculate the coupon periodically based on a reference rate plus a spread. The price of floaters stays closer to par, and the coupon-vs-yield distinction behaves differently.
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Assuming the coupon rate on TIPS or index-linked bonds is the real return. Inflation-linked bonds adjust principal with the CPI. The quoted coupon is a real rate applied to an inflation-adjusted principal. Nominal cash flows can differ materially from the stated coupon.
Frequently Asked Questions
Why does a bond's yield change even though the coupon stays the same? The coupon payment is contractually fixed, but the price you pay for the bond fluctuates with market interest rates. Because yield is calculated as coupon divided by price (for current yield), or as the internal rate of return on all cash flows (for YTM), any price change automatically changes the yield.
When is coupon rate the same as yield to maturity? Only when the bond trades exactly at par, meaning the market price equals face value. In that case, the investor pays face value and receives face value at maturity, so there is no pull-to-par gain or loss, and the coupon rate equals both current yield and yield to maturity.
Is a high coupon rate always better for an investor? Not necessarily. A high coupon bond often trades at a premium, so you pay more upfront, and if you sell or hold to maturity you lose that premium. What matters is yield to maturity relative to comparable bonds, not the coupon rate in isolation.
How does reinvestment risk relate to the coupon rate vs yield distinction? Yield to maturity assumes all coupons are reinvested at the same YTM rate. If coupon payments are reinvested at lower rates because market yields have fallen, realized return will fall short of the original YTM. Bonds with higher coupons have more cash flows to reinvest, making them more exposed to this reinvestment risk.
Does this relationship work differently for zero-coupon bonds? Zero-coupon bonds pay no periodic coupons, so coupon rate is zero. The entire return comes from the discount between purchase price and face value at maturity. Yield to maturity is still meaningful and calculated the same way, but there is no current yield figure because there are no coupon payments.
Sources
- FINRA. "Understanding Bond Yield and Return." https://www.finra.org/investors/insights/bond-yield-return
- SEC Investor.gov. "Coupon Payment." https://www.investor.gov/introduction-investing/investing-basics/glossary/coupon-payment
- FINRA. "Bonds: Key Terms." https://www.finra.org/investors/investing/investment-products/bonds/key-terms
- CFA Institute. "Yield and Yield Spread Measures for Fixed-Rate Bonds." https://www.cfainstitute.org/insights/professional-learning/refresher-readings/2026/yield-and-yield-spread-measures-for-fixed-rate-bonds
Disclaimer
This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.
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