For a fixed-rate bond, the coupon payment stays the same while its market price adjusts to compete with the yields available on comparable bonds. When market yields rise, the price of an existing bond generally falls; when market yields fall, its price generally rises. The coupon has not changed—the price moves, changing the yield a new buyer can earn.
Why bond prices and yields move in opposite directions
A bond is a loan to an issuer, such as a government, municipality or company. In return, the issuer promises interest payments and repayment of principal (the face or par value) at maturity, subject to the bond’s terms and the issuer’s ability to pay. A fixed-rate bond’s coupon is set by those terms; it does not automatically reset when market interest rates change.
Buyers compare the bond’s remaining payments with what comparable new bonds offer. If market yields rise, a bond with a lower fixed coupon becomes less attractive. Its price generally has to fall to make its payments competitive for a new buyer. If market yields fall, the existing bond’s higher coupon becomes more attractive, so buyers may pay more for it. Paying a higher price for the same scheduled payments means a lower yield for that buyer. The SEC describes this as a general relationship: market interest rates and bond prices tend to move in opposite directions.
A simple example
Imagine a bond with a fixed 3% coupon. If yields on comparable bonds fall to 2%, investors may be willing to pay a premium for the 3% bond. If comparable yields rise to 4%, the bond may need to sell at a discount. In either case, the bond’s coupon payment itself remains unchanged.
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SEC illustration: a $1,000 Treasury bond
The SEC’s 2013 example uses a Treasury bond with a $1,000 face value, a 3% coupon and nine years remaining. These are illustrative calculations, not current market quotes:
| Example market rate | Illustrative price | Yield to maturity shown |
|---|---|---|
| Falls from 3% to 2% | $1,082 | 2% |
| Rises from 3% to 4% | $925 | 4% |
The coupon remains 3% in both cases; the price changes so the bond’s cash flows offer a yield more competitive with the example market rate. SEC Investor Bulletin, June 26, 2013.
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Coupon rate, current yield and yield to maturity are different
“Yield” can refer to several measures. Check which one is being quoted before comparing bonds.
- Coupon rate: The stated annual interest rate in the bond’s terms. For a fixed-coupon bond, it generally stays the same over the bond’s life.
- Current yield: Annual coupon income divided by the bond’s current market price. Since price can change while the coupon remains fixed, current yield changes with price.
- Yield to maturity (YTM): The discount rate that equates the market price with the present value of the expected coupon and principal payments, assuming the investor holds the bond to maturity. YTM is a comparison measure, not a guaranteed realized return: reinvestment assumptions, default or selling before maturity can affect what an investor actually earns.
- Yield to call (YTC): A return measure based on holding a callable bond until its call date and receiving its call price, with reinvestment assumptions defined by the measure. Yield to worst is also used to assess callable bonds.
- Total return: Interest income plus market gains or losses, with applicable charges or commissions. It is not interchangeable with a quoted yield.
For definitions and further detail, see FINRA’s bond yield and return guide and the SEC’s investor bulletin.
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The inverse relationship describes the direction prices generally move, not the size of the move. Duration is a measure, stated in years, that helps indicate a bond’s price sensitivity to interest-rate changes. Higher duration generally signals greater sensitivity; it is a comparison tool, not an exact forecast for every rate change.
- Duration: Higher duration generally means larger price fluctuations for a given change in rates.
- Maturity: For otherwise similar bonds, longer maturity generally means greater interest-rate sensitivity because cash flows farther in the future are more affected by discounting.
- Coupon: For otherwise similar bonds, a lower coupon generally means greater sensitivity than a higher coupon.
When comparing bonds, also consider whether their credit quality, callability, liquidity and inflation exposure differ, and whether you might need to sell before maturity. These factors affect risk and the usefulness of a price or yield comparison. FINRA’s overview of bond interest-rate risk explains duration and related considerations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the inverse relationship does not mean
A bond’s market price can fall as rates rise even if it is a U.S. Treasury or a bond with an insurance or payment guarantee. A guarantee of promised payments does not protect the bond’s market value from changing. If an investor holds a bond to maturity and the issuer makes the promised payments, interim price movements may matter less—but holding does not erase other risks.
- Credit risk: The issuer may not pay interest or principal as promised.
- Inflation risk: Inflation reduces the purchasing power of fixed payments.
- Liquidity risk: A seller may not find a buyer at a price reflecting the bond’s value.
- Call and reinvestment risk: An issuer may redeem a callable bond, often when rates have fallen, leaving the investor to reinvest at less attractive rates.
- Sale-before-maturity risk: If you need to sell when market prices are down, you may realize a loss.
- Opportunity cost: Holding a bond means forgoing other investments that could perform better.
The SEC’s corporate-bond guidance discusses the price relationship and bond risks in more detail: Investor Bulletin. FINRA also explains how bond yields and returns differ: Bond Yield and Return.
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