Bond Basics: Coupon, Yield, and Maturity
A bond is a debt instrument where an investor loans money to an issuer for a fixed period. The issuer promises to pay a coupon - a fixed percentage return paid annually or semi-annually - and return the principal at maturity. A 1,000 dollar bond with a 5 percent coupon pays 50 dollars per year for the life of the bond. The yield is the effective return considering both coupon and price paid. If you buy a 1,000 dollar bond with a 5 percent coupon at 1,000 dollars, the yield is 5 percent. If you buy the same bond at 800 dollars, the yield rises above 5 percent because you are getting the same 50 dollar annual payment on a smaller investment. Bond duration measures sensitivity to interest rate changes, ranging from short-term (less sensitive) to long-term (very sensitive).
The Inverse Relationship: When Interest Rates Rise, Bond Prices Fall
This is the key mechanic that confuses many investors. When central banks raise interest rates, newly issued bonds offer higher coupons. Existing bonds with lower coupons become less attractive, so their prices must fall to match the new yields. If rates rise from 3 percent to 5 percent, a 3 percent coupon bond will trade below par to compensate. Conversely, when rates fall, existing bonds with higher coupons become more valuable, and prices rise. This inverse relationship is why bond investors monitor Federal Reserve policy closely. Long-duration bonds - those maturing in 20 or 30 years - swing wildly in price because interest rate changes affect the return over many decades. Short-duration bonds are less sensitive because maturity arrives sooner.
Bond Types: Government, Corporate, and Credit Risk
Government bonds, issued by countries like the US, carry minimal default risk because governments can print currency to repay. They typically offer lower yields reflecting their safety. Corporate bonds carry credit risk: if the company struggles, it may miss payments or default. Corporate bonds offer higher yields to compensate investors for this risk. High-yield or junk bonds from struggling companies pay 8 to 12 percent coupon but might lose half their value if the company fails. Investment-grade bonds, rated by Moodys or Standard and Poors, signal lower default probability and lower yields. Inflation-protected securities (TIPS) adjust their principal for inflation, providing protection when prices rise but lower nominal returns when inflation is absent.
Building a Bond Ladder and Managing Interest Rate Risk
A bond ladder spreads purchases across bonds maturing in 1, 3, 5, 7, and 10 years. As each bond matures, proceeds reinvest in a new 10-year bond, automatically capturing higher rates during rising-rate environments. This approach reduces timing risk and ensures regular income without betting on interest rate direction. Bond funds and bond ETFs offer instant diversification and professional management but fluctuate daily in value and may carry hidden fees. Individual bonds held to maturity eliminate price volatility; you receive the full coupon and principal regardless of market swings. For most investors, a blend of short and intermediate-term bonds or a diversified bond fund provides stability and income without excessive interest rate sensitivity.