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Bond Investing Basics

Bonds have a reputation as the "steady" asset class, but understanding what that really means starts with a handful of core concepts and how they fit together.

A bond is essentially an IOU

Buying a bond means lending money to the issuer — a government or a company — which agrees to pay interest on a set schedule and repay the principal when the bond matures. A bondholder is a creditor, not an owner, which is the key difference from holding stock.

Face value and coupon rate

Face value is the amount of principal repaid at maturity. The coupon rate is the fixed percentage of face value paid as interest, set when the bond is issued. Both numbers are locked in at issuance and normally don’t change over the bond’s life.

Bond prices and market interest rates usually move in opposite directions

When market interest rates rise, existing fixed-rate bonds become relatively less attractive and their market price typically falls. When rates fall, existing bonds usually become more valuable and their price rises. This inverse relationship is central to understanding why bond prices move at all.

Yield to maturity is not the same as the coupon rate

Yield to maturity factors in the purchase price, the coupon payments, and the principal repaid at maturity — it reflects the actual annualized return you’d earn buying at today’s market price and holding to maturity. Buy below face value and the yield to maturity is typically higher than the coupon rate; buy above face value and it’s typically lower.

Credit ratings reflect default risk

Different issuers have different ability to repay debt. Credit rating agencies assess an issuer’s financial health and assign a rating accordingly — a lower rating generally signals higher default risk, and the market usually demands a higher yield to compensate.

Government bonds versus corporate bonds

Bonds issued by governments are generally viewed as lower credit risk and tend to offer lower yields. Corporate bonds carry business risk and typically need to offer a higher coupon rate to attract investors — and credit quality can vary widely from one company to the next.

Bonds are not risk-free

Bonds are often seen as steadier than stocks, but that doesn’t mean risk-free: interest rate moves affect a bond’s market price, a deteriorating issuer can default, and high inflation can erode the real purchasing power of the returns. All of that needs to be weighed before investing.

Holding to maturity and selling early can produce different outcomes

If you buy a bond and hold it to maturity, your return is largely determined by the coupon rate and your purchase price. Sell before maturity, though, and your actual return is also shaped by whatever the market price happens to be at that moment — which can end up higher or lower than what holding to maturity would have delivered. This is an easy detail to overlook in bond investing.

Frequently Asked Questions

If a bond’s price falls, does that mean something is wrong with it?

Not necessarily. The most common reason bond prices fall is a broad rise in market interest rates, which makes existing fixed-rate bonds relatively less attractive — that’s not necessarily connected to the issuer’s own financial health. It’s worth looking at the specific situation before drawing conclusions.

Is a bond with a higher coupon rate automatically the better deal?

Not necessarily. The coupon rate is just the fixed percentage set at issuance — the actual yield to maturity depends on the purchase price as well, and bonds with higher coupon rates often carry higher credit risk too. Coupon rate alone isn’t enough to judge whether a bond is a good deal.