Why do bond prices fall when yields rise?
The promised payments stay the same. The price changes. Try a one-year bond to see the arithmetic.
Published 2026-09-28 · AI-assisted research and writing
The answer
A fixed-rate bond promises specified payments. If buyers demand a higher return on those same payments, they must pay less for them. The bond’s coupon does not need to change for its market price to fall.
Start with the payment, not the price
Imagine a bond with exactly one year left. It will pay $1,000 of principal and a final $40 coupon at the end of the year: $1,040 in total. Assume those payments arrive in full and on time, with no fees or taxes. There are no other payments before maturity.
At a price of $1,000, the buyer earns $40 over the year, or 4%. If comparable opportunities now offer 5%, a buyer seeking that return will pay about $990.48 for the same $1,040 payment. Nothing about the promised payment changed. The entry price did.
Hypothetical example · not market data
| Measure | Amount |
|---|---|
| Payment in one year | $1,040.00 |
| Price today | $990.48 |
| Gain at maturity | $49.52 |
Price = $1,040 ÷ (1 + 0.05). The coupon remains $40. Current yield is 4.04%; the one-year return to maturity is 5%.
Coupon rate and yield answer different questions
The coupon rate describes interest relative to the bond’s face value. In this example it is 4%: $40 divided by $1,000. Current yield divides the annual coupon by today’s price. Yield to maturity also accounts for the difference between the purchase price and principal repaid, as well as payment timing.
At $990.48, current yield is about 4.04%. The one-year return to maturity is 5%, because the buyer also receives more principal at maturity than they paid for the bond. Calling both numbers simply ‘the yield’ can hide that distinction.
A lower quote is a real change in what you can sell for
An owner who needs to sell before maturity faces the current market price. An owner who holds this particular bond until maturity still expects the promised payment, provided the issuer pays. That does not remove default risk, inflation risk or the opportunity cost of having money tied up at the earlier rate.
Bond funds are different from a single bond held to a known maturity. Their holdings change, so the one-year example is not a promise that a fund’s share price will recover by a particular date.
What to check in a market headline
Ask which yield rose, which maturity is being discussed, and whether the change reflects general rates or the compensation investors demand for that issuer’s risk. Different bonds can move differently. Longer-dated fixed payments are generally more sensitive to rate changes, all else equal.
A central-bank announcement can influence market yields, but it does not mechanically set every bond price. Expectations may change before the announcement. The price–yield relationship explains the arithmetic; identifying why investors changed their required return needs separate evidence.