Introduction

When investors purchase a bond, they are generally lending money to a government, company, or other organization. In exchange, the issuer typically agrees to make interest payments throughout the life of the bond and repay the principal at maturity.

A bond coupon is the interest rate that determines the periodic interest payments a bondholder receives based on the bond's face value. Understanding how coupons work can help investors evaluate the income a bond may provide and understand why bond prices and yields can change.

1. What Is a Bond Coupon?

The coupon rate is the annual interest rate stated on a bond, expressed as a percentage of its face value, also known as par value.

For example, suppose an investor owns a bond with:

• Face value: $1,000
• Coupon rate: 5%
• Annual coupon payment: $50

The investor would generally receive $50 in interest each year, although the actual payment schedule can vary depending on the bond.

The coupon rate itself typically does not change for a traditional fixed-rate bond.

2. How Are Coupon Payments Calculated?

A bond's annual coupon payment can generally be calculated using:

Annual Coupon Payment = Face Value × Coupon Rate

For example, a $1,000 bond with a 6% coupon rate would provide:

$1,000 × 6% = $60 per year

If the bond pays interest twice a year, the investor would generally receive $30 per payment.

The calculation is based on the bond's face value, not necessarily the price the investor paid for the bond in the secondary market.

3. What Is the Difference Between Coupon Rate and Yield?

The coupon rate is the interest rate stated on the bond, while yield reflects the return an investor may receive based on the bond's current market price and other factors.

For example, a bond with a $1,000 face value and a 5% coupon pays $50 in annual interest. If the bond trades for $900, its current yield is approximately 5.56%.

If the same bond trades for $1,100, its current yield is approximately 4.55%.

This is why a bond's coupon rate can remain unchanged while its yield changes as its market price moves.

4. How Do Interest Rates Affect Bond Coupons?

Coupon rates become particularly important when market interest rates change.

Suppose an existing bond pays a 3% coupon while newly issued bonds begin offering 5%. Investors may be less willing to pay full price for the older 3% bond because newer bonds offer higher interest payments.

As a result, the existing bond's market price may decline until its yield becomes more competitive.

Generally, bond prices and market interest rates move in opposite directions, although other factors can also affect bond prices.

5. What Are Fixed and Floating Coupons?

Bonds can have different coupon structures.

• Fixed Coupon: The interest rate remains the same throughout the bond's term.
• Floating Coupon: The interest rate adjusts periodically based on a reference interest rate or other benchmark.
• Zero-Coupon Bond: The bond does not make regular coupon payments. Instead, it is typically issued at a discount and pays its face value at maturity.

These structures can provide investors with different combinations of income, interest-rate exposure, and price risk.

Conclusion

A bond coupon represents the interest rate used to determine the periodic payments a bondholder receives based on the bond's face value. For a traditional fixed-rate bond, the coupon payment generally remains consistent throughout the bond's life.

However, the bond's yield can change as its market price changes. Understanding the difference between coupon rate, price, and yield is therefore essential for evaluating fixed-income investments.

By examining coupon payments alongside credit risk, maturity, market price, and interest rates, investors can develop a more complete understanding of how bonds generate income and how their values can change over time.