When people talk about investing, shares usually receive most of the attention. Bonds can sound less exciting, but they play an important role in many portfolios because they may provide income, diversification, and a more predictable repayment structure.

A bond is essentially an IOU. Instead of buying ownership in a business, you lend money to a company, government, or another organisation. In exchange, the issuer normally promises to make interest payments and return the original amount on a specified date.

Understanding what bonds are and how investors make money from them requires more than looking at the advertised interest rate. Bond prices can move after issuance, market interest rates affect their value, and higher yields often come with additional risk.

Bonds are not guaranteed profit machines. Issuers can experience financial problems, inflation can reduce the value of future payments, and investors who sell early may receive less than they originally paid. Here is how the investment works in practice.

What Is a Bond?

A bond is a debt security issued to raise money. Governments may issue bonds to finance public spending and infrastructure, while companies may use them to fund expansion, purchase equipment, refinance existing debt, or support everyday operations.

When you buy a company’s shares, you become a partial owner. When you purchase its bond, you become a creditor. The company has a contractual obligation to make the promised payments, although those payments still depend on its ability to meet its debts.

Most traditional bonds have a face value, a maturity date, and a coupon rate. These terms tell you how much the issuer is expected to repay, when repayment should occur, and how much interest the bond provides.

For example, imagine purchasing a bond with a $1,000 face value, a five-year maturity, and a 5% annual coupon. The issuer would normally pay $50 in interest each year and return the $1,000 principal at maturity, assuming it does not default.

Understand the Main Bond Terms

The face value, also called par value or principal, is the amount the issuer agrees to repay when the bond matures.

The maturity date is when the bond reaches the end of its term. Maturities can range from a few months to several decades, depending on the security.

The coupon rate determines the bond’s regular interest payment. A 5% coupon on a $1,000 face value produces $50 of annual interest. The payment may be divided into two instalments, although schedules vary.

The market price is what investors currently pay to buy the bond. It may be equal to, above, or below its face value.

Finally, the yield describes the return relative to the bond’s price. Yield to maturity is a broader calculation that considers the purchase price, interest payments, face value, and remaining time until maturity.

How Investors Make Money from Coupon Payments

The most straightforward way to earn money from a bond is through coupon payments. These provide regular income while the bond remains outstanding.

Suppose an investor owns $10,000 of bonds paying a 4% annual coupon. The expected yearly income would be $400, provided the issuer continues making payments.

This predictable schedule can appeal to investors who want portfolio income. However, the coupon amount should not be confused with the investor’s complete return.

If you paid more than face value for the bond, your effective return may be lower than the coupon rate. If you purchased it at a discount, your effective return may be higher.

Some bonds, known as zero-coupon bonds, do not make regular interest payments. Investors buy them below face value and receive the full face value at maturity. The difference between the purchase price and repayment value creates the return.

How Investors Make Money from Price Changes

Bonds can often be bought and sold before they mature. This creates another potential source of return: capital gains.

Imagine buying a bond for $1,000 and later selling it for $1,080. The $80 difference is a capital gain, separate from any coupon payments received while you owned the security.

A bond could rise in price when market interest rates fall. Its existing coupon becomes more attractive because newly issued bonds may offer lower payments.

The opposite can happen when rates rise. New bonds may offer better interest, making older fixed-rate securities less appealing. Investors may only buy the older bond at a discount.

Selling before maturity therefore introduces price risk. An investor who holds an individual bond until maturity may receive its face value, subject to default and other terms.

Someone who sells earlier receives the market price, which could be higher or lower than the original investment.

Why Bond Prices and Yields Move in Opposite Directions

Bond prices and yields generally have an inverse relationship. When the market price falls, the yield available to a new buyer rises. When the price increases, the yield falls.

Consider a bond paying $50 annually. When it trades at its $1,000 face value, its current yield is 5%.

If the market price falls to $900, the $50 payment does not change, but a new buyer is investing less money. The current yield rises to approximately 5.56%.

If the price increases to $1,050, the same $50 payment represents a current yield of approximately 4.76%.

This relationship is important because the coupon rate remains based on the bond’s face value, while yield reflects the return relative to the price paid. Yield to maturity goes further by including the gain or loss that may occur when the bond is repaid at face value.

Common Types of Bonds

Government bonds are issued by national governments. The exact names vary by country; US marketable Treasury securities include bills, notes, bonds, floating-rate notes, and inflation-protected securities.

Corporate bonds are issued by businesses. They often provide higher yields than government debt because investors must consider the possibility that the company could fail to pay its interest or principal.

Municipal bonds in the United States are issued by states, cities, counties, and other public bodies. They can finance projects such as schools, roads, and sewer systems. Their tax treatment depends on the bond and the investor’s circumstances.

Bonds can also be classified as investment grade or high yield. High-yield bonds normally offer greater income because their issuers are considered more likely to default. The higher rate is compensation for taking additional credit risk, not free money.

What Risks Do Bond Investors Face?

Credit risk is the possibility that the issuer cannot make the required payments. A default could cause investors to lose part or all of their capital.

Interest-rate risk affects the market value of fixed-rate bonds. When rates rise, existing bond prices generally fall. Longer-term securities are often more sensitive to rate changes than shorter-term bonds.

Inflation risk occurs when rising prices reduce the purchasing power of the interest and principal you receive. A fixed $500 payment buys less when living costs increase significantly.

Liquidity risk means you may struggle to find a buyer at a reasonable price when you want to sell. This can be particularly important for less frequently traded corporate or municipal securities.

Some bonds are callable, which means the issuer may repay them before the scheduled maturity date. This often happens when interest rates fall and the issuer can refinance more cheaply, leaving the investor to reinvest at lower rates.

Individual Bonds versus Bond Funds

Investors can purchase individual bonds or gain exposure through bond mutual funds and exchange-traded funds.

An individual bond has its own issuer, coupon, price, and maturity date. When held until maturity, it is generally expected to repay its face value, provided the issuer remains able to pay and the bond is not called.

A bond fund holds many debt securities. This can provide diversification and make it easier to invest across different issuers, maturities, and markets.

However, a bond fund does not usually mature like one individual bond. Its portfolio changes as securities mature, are sold, or are replaced. The fund’s value can rise or fall, and investors can lose money even when it owns government or insured bonds.

Funds also charge expenses. Before investing, review the prospectus, portfolio holdings, duration, credit quality, yield, historical volatility, and management fees.

What to Check Before Buying a Bond

Start by identifying the bond’s issuer and considering whether it can meet its obligations. Credit ratings may help compare relative default risk, but they are opinions rather than guarantees.

Review the maturity date, coupon rate, purchase price, current yield, yield to maturity, and any call provisions. A high coupon may look attractive, but the bond might trade above face value or carry significant credit risk.

You should also check whether the bond is secured by specific assets, where it ranks among the issuer’s other debts, and whether it can be sold easily.

FINRA recommends evaluating factors such as maturity, security provisions, yield, call status, tax treatment, and credit rating before purchasing a bond.

Finally, consider how the investment fits your wider portfolio. A bond should support your objectives, time horizon, liquidity needs, and risk tolerance rather than being selected only because its advertised yield looks high.

Bonds are loans made by investors to governments, companies, or other organisations. Investors can earn money through coupon payments, repayment of principal, buying securities below face value, or selling them at a higher market price.

Those potential returns come with risks. Interest-rate movements can change bond prices, inflation can reduce purchasing power, and financially weak issuers may fail to make payments.

Bond funds add diversification but can also decline in value and do not provide the same maturity structure as individual securities.

Before investing, examine the issuer, maturity, yield, credit quality, fees, and call terms. Start by comparing a government bond, an investment-grade corporate bond, and a diversified bond fund so you can see how their expected returns and risks differ.