Bonds show up in almost every serious investment portfolio — especially as people get closer to retirement. They’re considered safer than stocks, but they work very differently. Understanding what a bond is and how it generates income helps you see why they play the role they do.
Quick answer: what is a bond?
A bond is a loan you make to a borrower — a government, a city, or a company — in exchange for regular interest payments and the return of your principal at a set date in the future. When you buy a bond, you become a creditor, not an owner. You don’t get a stake in the company’s growth; you get a contractual promise to be repaid with interest.
Watch: what is a bond
How bonds work
The basic mechanics of a bond:
- Face value (par value): The amount the borrower agrees to repay at maturity. Typically $1,000 per bond.
- Coupon rate: The annual interest rate the bond pays, expressed as a percentage of face value. A 4% coupon on a $1,000 bond pays $40 per year.
- Maturity date: When the borrower repays the face value. Can be months away or 30 years out.
- Coupon payments: Usually paid semiannually. A $1,000 bond with a 4% coupon pays $20 every six months.
Example: You buy a 10-year, $1,000 bond with a 4% coupon. Every year you receive $40 in interest. After 10 years, you get your $1,000 back. Total income: $400 in interest plus your original $1,000.
Types of bonds
- U.S. Treasury bonds: Issued by the federal government. Backed by the full faith and credit of the U.S. government — the closest thing to a risk-free investment. Treasury bills (T-bills) mature in under a year; Treasury notes in 2–10 years; Treasury bonds in 20–30 years.
- Municipal bonds (munis): Issued by states, cities, and local governments. Often exempt from federal income tax and sometimes state tax too — which makes them attractive to higher-income investors.
- Corporate bonds: Issued by companies. Pay higher interest than government bonds to compensate for higher risk. A company can default on its bonds if it goes bankrupt.
- I bonds: Inflation-linked savings bonds issued by the U.S. Treasury. The interest rate adjusts with inflation, making them useful for protecting purchasing power.
- Junk bonds (high-yield bonds): Bonds issued by companies with lower credit ratings. Higher interest rates, higher default risk.
Bond prices and interest rates
One of the most important — and counterintuitive — things about bonds: when interest rates rise, existing bond prices fall. When rates fall, bond prices rise.
Why? If you hold a bond paying 3% and new bonds are paying 5%, your bond is less attractive — so its market price drops to make the yield competitive. If you hold to maturity, this doesn’t matter: you still get your principal back. But if you need to sell before maturity, you may sell for less than you paid.
Bond ratings
Credit rating agencies (Moody’s, S&P, Fitch) assess how likely a bond issuer is to repay. Ratings run from AAA (highest quality) down to D (in default). Bonds rated BBB or above are “investment grade.” Below BBB are “speculative” or junk bonds. Higher-rated bonds pay lower interest because the risk is lower.
Bonds vs. stocks
| Bonds | Stocks | |
|---|---|---|
| What you are | Lender (creditor) | Owner (shareholder) |
| Return source | Interest payments | Price appreciation + dividends |
| Risk level | Generally lower | Generally higher |
| Return potential | Lower | Higher over long periods |
| If company fails | Paid before stockholders | Last in line |
| Suitable for | Income, stability, capital preservation | Long-term growth |
Why people hold bonds
- Income: Bonds pay predictable interest, making them useful for generating steady cash flow — especially in retirement.
- Capital preservation: If held to maturity, you get your principal back (barring default).
- Diversification: Bonds and stocks often move in different directions, so holding both smooths out portfolio volatility.
- Lower volatility: Bond prices fluctuate less dramatically than stock prices, making them a stabilizing force in a portfolio.
How to buy bonds
Individual bonds can be purchased through a brokerage account or directly from the U.S. Treasury at TreasuryDirect.gov for government bonds. However, most individual investors access bonds through bond funds — mutual funds or ETFs that hold hundreds of bonds at once — because individual bonds can be complex to buy and have high minimum purchases.
Further Reading
This article is for general educational purposes only and does not constitute financial or investment advice. Investing involves risk, including the possible loss of principal. Consult a qualified financial advisor before making investment or financial planning decisions.