Bond coupon, yield and price: three figures that mean different things
A bond's coupon describes its stated interest payments. Its market price is what someone pays to buy it. Its yield relates income or expected payments to that price, depending on the yield measure used. These figures should not be treated as interchangeable.
Understanding the distinction helps explain why a bond with a fixed coupon can change in value and why a high quoted yield is not a guaranteed total return. This guide uses simplified examples rather than current investment quotations.
Start with the promised payments
For a conventional fixed-rate bond, the terms specify coupon payments and a maturity payment, subject to the issuer meeting its obligations. The coupon rate is normally expressed against the bond's face or nominal amount, rather than the price you pay in the market.
Suppose a fictional bond has a £1,000 face value and a 5% annual coupon. Its stated annual interest is £50. Buying it for a different price does not, by itself, change that £50 payment.
The actual terms can be more complicated. Some bonds have variable or inflation-linked payments, early-redemption features or other conditions. Establish the instrument being discussed before applying a simple fixed-coupon example.
The purchase price changes the income yield
If the fictional £50 coupon bond is bought for £1,000, its simple current income yield is 5%. If bought for £900, £50 divided by £900 is about 5.56%. If bought for £1,100, the same calculation is about 4.55%.
| Illustrative purchase price | Annual coupon | Simple current income yield |
|---|---|---|
| £900 | £50 | 5.56% |
| £1,000 | £50 | 5.00% |
| £1,100 | £50 | 4.55% |
These figures ignore costs, tax, accrued interest and the maturity payment. They are current-income calculations, not yields to maturity or complete expected returns.
Redemption matters to the total result
If the bond is redeemed at £1,000 under its terms, someone who paid £900 and someone who paid £1,100 have different capital outcomes. The time remaining until redemption also matters when expressing an annualised return.
A yield-to-maturity calculation considers the scheduled payments and purchase price under stated assumptions, including payment being made as expected. It is different from dividing one year's coupon by the purchase price.
Ask which yield a quotation displays, its calculation date and what it assumes. Do not compare a fund's distribution yield, a bond's coupon and a deposit interest rate as though all three describe the same promise.
Why a fixed coupon does not mean a fixed market value
Market prices respond to factors including prevailing yields and perceptions of the issuer's ability to pay. If comparable new bonds offer higher yields, the price of an existing lower-coupon bond may fall to make its payments more competitive. The reverse can also occur.
The Bank of England explains the inverse relationship between bond prices and yields in its discussion of bond purchases. A rising bond price means its yield falls relative to the payments it offers. Bank of England: quantitative easing and bond yields.
That relationship does not mean every bond responds identically to a change in Bank Rate. Maturity, coupon, credit conditions and other features affect the result.
Consider credit and interest-rate risks separately
Credit risk concerns whether the issuer can meet its obligations. Interest-rate sensitivity concerns how the price responds to changes in market yields. A bond can have relatively low perceived credit risk and still experience a substantial market-price fall.
Vanguard's explanation of bond funds discusses maturity and credit quality as separate characteristics. Those distinctions help explain why two funds labelled as bonds can behave differently. Vanguard: understanding bond fund characteristics.
Do not treat a government issuer, a high credit rating or the phrase fixed income as a guarantee that the amount invested cannot fall in value before sale.
Put the quotation into the wider plan
If the purpose is to fund a known future payment, consider the actual dates, amounts, access, tax and risk rather than choosing the largest displayed yield. If using a fund, understand that its portfolio may continually change and may not mature on one date like a single bond.
Ask for costs and any dealing adjustments to be included in the comparison. A clean quoted price can differ from the cash settlement amount because of accrued interest and charges.
The useful record states the instrument, payment terms, purchase price, yield measure, maturity and main risks. With those details, a reader can ask an informed question about the role of the investment instead of mistaking one percentage for the complete outcome.
Related reading
Sources and context
General educational information, not personal financial advice. Examples are illustrative unless identified as recorded evidence.
Sources checked 18 September 2026. Our editorial standards.