Why it matters
Bonds are often described as safe, but that word hides several moving parts. A bond promises interest and principal under defined terms; its market price can still rise or fall before maturity.
In a portfolio, high-quality bonds may reduce volatility, fund nearer withdrawals, and provide assets that can be rebalanced into stocks after declines.
How it works
Bond prices generally move opposite to market interest rates because existing payments become more or less attractive relative to new bonds. Longer maturities usually react more to rate changes. Credit risk reflects the chance the borrower does not pay as promised.
A bond fund holds many bonds and continually replaces maturities. It diversifies issuers but does not have one maturity date at which the fund price is guaranteed.
The essentials
- Coupon is the stated interest payment.
- Yield reflects price as well as payments.
- Duration estimates sensitivity to interest-rate changes.
- Credit quality and maturity shape risk.
Separate bond interest from principal repayment
A fictional three-year bond is bought for its $1,000 face value. It pays a 4% coupon once a year and returns principal at maturity.
Read the image as text
- End of year 1
- $40Interest payment.
- End of year 2
- $40Interest payment.
- End of year 3
- $1,040$40 interest + $1,000 principal.
Example assumptions: Bond bought at face value, annual fixed coupon, held to maturity, issuer pays in full, no reinvestment of coupons, fees, tax, or inflation. This is not a forecast of bond-fund returns.
- Calculate the annual coupon
$1,000 × 4% = $40 in interest each year, if the issuer makes the promised payments.
- List the payment dates
The investor receives $40 at the end of year one, $40 at the end of year two, and $1,040 at the end of year three.
- Separate return from repayment
Total cash received is $1,120, but $1,000 is simply the original principal coming back. The interest earned is $120 before fees and tax.
A large maturity payment is mostly repayment, not profit. Selling before maturity introduces a market price that may differ from $1,000.
Your next-step checklist
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Define whether bonds are for stability, income, or a dated goal.
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Check duration and credit quality, not just yield.
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Use diversification when lending to corporate issuers.
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Match near-term liabilities with suitably stable assets.
A high yield usually reflects higher risk. Bonds can lose money, and inflation can reduce the purchasing power of fixed payments.
Explore further, if useful
The essentials are above. Open a topic below when it helps answer your next question.
Another example: Repricing a five-year bond
Consider a $1,000 five-year bond paying $30 annually, a 3% coupon. If comparable new bonds yield 5%, the present value of the old bond's payments is roughly $913.
An investor who holds the individual bond to maturity still expects $1,000 back if the issuer pays as promised, but anyone selling earlier faces the lower market price. A bond fund reflects this repricing across many holdings every day.
- Face value
- $1,000
- Coupon
- 3%
- Value at 5% yield
- About $913
Why existing bond prices move when rates change
A fixed bond payment becomes less attractive when newly issued bonds offer more interest. Its market price falls until the remaining cash flows offer a competitive yield. The reverse generally happens when new rates decline.
Maturity magnifies this effect because a long bond locks in its payment for more years. Credit quality adds a separate risk: even an attractive yield is only useful if the borrower can make the promised payments.
Coupon, yield, and risk tell different stories
The coupon describes contractual interest based on face value, while current yield and yield to maturity incorporate the market price. A low-coupon bond bought at a discount can offer a different return from its coupon, and a high-coupon bond bought at a premium can offer less. Comparisons should use a consistent yield measure and account for call features, default risk, fees, and tax.
Duration gives a practical sense of interest-rate sensitivity, but it is an estimate rather than a guarantee. Credit spreads can widen at the same time rates move, especially for lower-quality issuers. A bond selected for stability should not quietly take stock-like credit risk to raise income. Match the issuer quality and maturity profile to the purpose of the money, then judge the return offered for accepting those risks.
Put the idea into a wider plan
Read a bond as a contract. Identify the issuer, maturity date, coupon, payment currency, seniority, call features, and current yield. Then ask what could prevent full repayment and how the price would respond if market interest rates changed. A government bill due soon and a long-term lower-quality corporate bond may both be called fixed income, yet they solve very different problems.
Match maturity to the job. Money needed soon may use short, high-quality instruments to limit price movement. A longer-term portfolio may hold a diversified bond fund for income, stability, and rebalancing capacity, while accepting that its price can fall. Compare yield after fees with credit and duration risk; a noticeably higher yield is usually compensation for something, not a free improvement.
Why do bond prices fall when interest rates rise?
Existing bonds with lower coupons become less attractive than newly issued bonds paying more, so their market prices adjust downward. The effect is generally larger for longer maturities. If held to maturity and repaid, an individual bond still returns its stated principal, subject to default and contract terms.
Can a bond fund mature like an individual bond?
Most broad bond funds continually replace maturing holdings and do not have one date when the entire fund repays principal. A target-maturity fund is different. Understand whether you need a known cash-flow date or ongoing diversified bond exposure.
Are government bonds risk-free?
They may have very low default risk in their own currency, but their market prices can still change, inflation can reduce purchasing power, and foreign bonds add currency risk. Risk-free should always specify which risk and over what period.