Coupon rate

Before you rely on it

What to check

Keep it separate from current yield and yield to maturity. Coupon rate is measured against face value; the other two are measured against what you actually paid.

The common error

Where people go wrong with coupon rate

Quoting a bond's coupon rate as its yield. Buy at a discount and the yield is higher than the coupon; buy at a premium and it is lower, and the two are only equal at par.

Worked through

Coupon rate in plain numbers

A bond with a $1,000 face value and a 4% coupon rate pays $40 a year for its whole life, whatever happens to market rates. Suppose new bonds start paying 6%. Nobody will pay $1,000 for a 4% bond when 6% is available, so its price falls until its return matches the market, near $850 if ten years remain. If new bonds pay 3%, the 4% bond becomes attractive and its price rises above $1,000; the coupon rate is fixed on the day of issue. Everything else about the bond moves around it.

Easily confused

Coupon rate and its neighbours

The coupon rate is not the yield. It is the fixed annual interest as a percentage of face value. Yield measures the return based on the price you actually pay and the time left, and a 4% coupon bought at 90 has a higher yield than 4%, and one bought at 110 has a lower one. The coupon rate is also different from the interest rate on a loan you take, since it is set by the issuer for investors. Floating-rate bonds reset their coupon rate, and zero-coupon bonds have none.

In real decisions

Where coupon rate turns up

You read the coupon rate off a bond's description to work out the cash it pays. Income investors add up the coupons across holdings to see annual income. Issuers set the coupon near the market rate for their credit quality on the day of sale. Tax reporting uses it to identify interest income. In bond math, it is one of the inputs to the price formula, along with yield, face value and maturity; comparing coupon rates across bonds tells you about income but not about value.

Know the edges

Where coupon rate stops being reliable

A high coupon rate is not a sign of a good bond; it can reflect higher credit risk, an older bond that was issued when rates were higher or a callable bond likely to be redeemed early. Coupon and price interact, so what matters is total return, including price changes and reinvestment. Inflation erodes fixed coupons. Always check credit quality, call features and the price you pay before drawing conclusions from the coupon alone.

Quick answers

What people ask about coupon rate

Does a higher coupon rate mean a better bond? No. A high coupon can come from higher credit risk or from being issued when rates were higher. Compare yield to maturity, credit quality and call features.

Can the coupon rate change? Not on a fixed-rate bond. Floating-rate bonds reset periodically against a benchmark, and step-up bonds follow a schedule set at issue.

Is the coupon rate the same as the interest I earn? Only if you buy at face value and hold to maturity. Paying more or less than face changes your effective yield.