Bond
Definition
Bond: How Fixed-Income Loans Actually Work
A bond is a fixed-income security that represents a loan from an investor to a borrower — usually a government, municipality, or corporation. The issuer agrees to pay periodic interest (the coupon) and return the face value on a stated maturity date. Bonds sit opposite equities in the capital stack: bondholders are creditors, not owners.
Most US-issued bonds carry a face value of $1,000, a fixed coupon rate, and a maturity ranging from a few months to 30 years. The borrower repays the principal at the end. If you sell before maturity, you take whatever the secondary market will pay that day.
That predictable cash flow is why pension funds, insurers, and conservative investors load up on bonds. The U.S. Securities and Exchange Commission describes them as generally less volatile than stocks, but warns they still carry credit, interest-rate, inflation, liquidity, and call risk. Nothing about a bond is risk-free; it is just a different shape of risk.
The global bond market is larger than the global equity market by total outstanding value, and that scale is what makes coupon math the backbone of most portfolios. If you understand how a bond is priced, you understand how most of finance moves.
How it works
A bond starts at issuance. The borrower sets a coupon rate — the annual interest paid as a percentage of face value — along with a maturity date and a credit rating from agencies like Moody’s or S&P. Investors buy at par, at a discount, or at a premium, depending on how the coupon compares to prevailing market rates.
After issuance, the issuer pays interest on a schedule (usually semi-annually for US bonds) until maturity, when the principal lands back in the holder’s account. Between those dates, the bond can change hands on the secondary market, and that is where things get interesting.
Bond prices move inversely to interest rates. When market rates climb, the resale value of older lower-coupon bonds falls, because buyers can now get a fatter coupon on a brand-new issue. When rates drop, older bonds with juicier coupons trade at a premium. Yield to maturity (YTM), the total annualised return if you hold to the end, is the metric that bakes the coupon and any capital gain or loss into a single number.
| Risk | What it means | How investors offset it |
|---|---|---|
| Credit risk | Issuer defaults on a coupon or principal payment | Stick to investment-grade ratings; spread issuers |
| Interest-rate risk | Bond price drops when rates rise | Ladder maturities; hold to maturity |
| Inflation risk | Real return erodes as prices climb | Allocate to TIPS or inflation-linked bonds |
| Liquidity risk | Hard to sell at a fair price | Favour large, actively traded issues |
| Call risk | Issuer redeems early when rates fall | Avoid callable bonds, or demand higher yield |
The Financial Industry Regulatory Authority catalogues nine separate bond-risk categories, including duration, reinvestment, and event risk. The 10-year US Treasury yield, published daily in the Federal Reserve H.15 release, is the benchmark most fixed-income desks measure everything else against.
Examples
US Treasuries (sovereign): The US Treasury is the largest single bond issuer on earth. Its debt is split into three maturity buckets: bills (under 1 year), notes (2–10 years), and bonds (20–30 years). In 2024, Treasury auctions of marketable securities exceeded $26 trillion in gross issuance, a record driven by deficit financing and refinancing of maturing debt.
Apple Inc. (investment-grade corporate): In 2023, Apple returned to the bond market with a $5.25 billion multi-tranche deal to fund share buybacks and general operations. Its credit rating put pricing within a tight spread of comparable Treasuries, proof that a cash-rich tech firm can still find borrowing cheaper than dipping into its own reserves.
Municipal bonds: New York’s Metropolitan Transportation Authority issues revenue bonds backed by farebox income and dedicated taxes to finance subway and bridge upgrades. US investors typically receive federal tax exemption on muni-bond interest, and often state and local exemption too, which lifts the after-tax yield above what a comparable Treasury offers.
Green bonds: The European Union’s NextGenerationEU programme has issued tens of billions in green bonds since 2021, all aligned with the ICMA Green Bond Principles 2025 edition. Proceeds are ring-fenced for climate-transition projects, with annual impact reporting back to investors, the kind of transparency that distinguishes a credible green bond from a marketing label.
Related terms
- Interest rate: the price of borrowing money, and the single biggest driver of bond prices.
- Dividend: payment to equity holders, not bond holders; bonds pay coupons instead.
- Asset allocation: the portfolio split between bonds, equities, and other classes.
- Green bond: a bond whose proceeds fund environmental projects.
- Sustainability bond: proceeds split between green and social outcomes.
- Value investing: an equity strategy, often paired with bond holdings to dampen volatility.
- Capital loss: what you book if you sell a bond below your purchase price.
FAQ
What is a bond in simple terms?
An IOU with a calendar. You lend money to a government or company, they pay you interest on a schedule, and they return your principal on the maturity date.
Are bonds safer than stocks?
Generally, yes. Bonds are less volatile and rank above equity in the capital stack if the issuer goes under. But high-yield (junk) bonds can swing as hard as stocks, and even Treasuries lose market value when interest rates rise.
How is a bond’s price determined?
Price moves inversely with interest rates and reflects issuer credit quality, time to maturity, and the coupon rate. Higher market yields push existing lower-coupon bonds down in price, and vice versa.
What is yield to maturity?
Yield to maturity is the total annualised return you’d earn if you held the bond until it matured, factoring in coupon income plus any capital gain or loss against your purchase price.
What’s the difference between a Treasury bill, note, and bond?
All three are US government debt, separated only by maturity. Bills mature in under a year and are sold at a discount with no coupon; notes mature in 2–10 years; bonds mature in 20–30 years. Notes and bonds pay semi-annual interest.
Can I lose money on a bond?
Yes. You can lose principal through issuer default, by selling before maturity when prices have fallen, or by holding through an inflationary period that erodes the real value of your coupons.
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