A coupon bond is a debt security that pays its holder a fixed amount of interest at regular intervals and returns the original principal when the bond matures. The “coupon” name is a holdover from the days when investors clipped paper tabs off a physical certificate to collect each interest payment. Ownership records are electronic now, but the word stuck as industry shorthand for a bond’s scheduled interest payment.
The Three Features Fixed at Issue
Every coupon bond locks in three things on the day it’s issued. The face value, also called par value, is the principal the issuer promises to repay at maturity. The maturity date is when that repayment happens. The coupon rate is the fixed annual interest rate applied to the face value, and it determines how much cash the bondholder collects each year.
A coupon payment is the dollar amount of interest the investor receives, calculated by multiplying the coupon rate by the face value.1Investor.gov. Coupon Payment A $1,000 bond with a 5% coupon rate pays $50 a year. Many bonds split that into two semiannual payments of $25. The coupon rate does not change over the life of the bond, which is the whole appeal for income-focused investors. You know what you will be paid and when.
Why the Coupon Rate Doesn’t Equal the Return
The coupon rate is fixed. The bond’s market price is not. The two move in opposite directions: when prevailing interest rates rise, existing bonds with lower coupons lose value; when rates fall, those same bonds gain value. The coupon payments themselves don’t change regardless of what the market does.2Investor.gov. When Interest Rates Go Up, Prices of Fixed-Rate Bonds Fall
That produces three pricing scenarios. When the coupon rate matches the prevailing market rate, the bond trades at par. When market rates are higher than the coupon rate, the bond trades at a discount to face value. When market rates are lower than the coupon rate, buyers pay a premium above face value to capture the higher fixed payments.
Current Yield
If you pay anything other than par, the coupon rate no longer tells you what you’re earning. Current yield adjusts for that by dividing the annual coupon payment by the bond’s current market price. A $1,000 bond with a $50 annual coupon trading at $950 has a current yield of roughly 5.26%, higher than the stated 5% coupon rate. Pay a premium and current yield drops below the coupon rate.
Yield to Maturity
Current yield still misses something. When the bond matures, the issuer pays back face value. Bought at a discount, you pocket a gain. Bought at a premium, you absorb a loss. Yield to maturity folds that final gain or loss into the calculation along with the time value of every remaining coupon, producing the most complete measure of what the bond will return if held to maturity.2Investor.gov. When Interest Rates Go Up, Prices of Fixed-Rate Bonds Fall It’s the number professional investors compare across bonds.
How Much the Price Moves: Duration
Duration estimates how much a bond’s price will shift when interest rates change. The rule of thumb is that for each one-percentage-point change in rates, a bond’s price moves in the opposite direction by roughly its duration figure. A bond with a duration of five years would drop about 5% if rates rose one point and gain about 5% if rates fell one point.3FINRA. Brush Up on Bonds: Interest Rate Changes and Duration
The coupon rate feeds directly into duration. A higher coupon returns more of your money sooner through larger periodic payments, which shortens duration and dampens price swings. A lower coupon pushes more of the total return out to the final maturity payment, lengthening duration and increasing volatility.3FINRA. Brush Up on Bonds: Interest Rate Changes and Duration Longer maturities push duration up too. A 30-year bond with a low coupon will swing hard on rate moves. A 2-year bond with a high coupon barely reacts.
Duration is an approximation. It assumes a straight-line relationship between price and rate changes, but actual bond prices move in a curve, so duration tends to overstate losses when rates jump and understate gains when rates drop. It’s still the standard shorthand for interest rate risk.
Buying Between Payment Dates: Accrued Interest
Bonds trade every day, not only on coupon dates. When a bond changes hands between payments, the buyer owes the seller compensation for the interest that has built up since the last coupon date. That amount, called accrued interest, is added to the purchase price at settlement.
FINRA rules govern how the number is calculated: interest accrues on a 360-day year, each calendar month is treated as 30 days, and the accrued figure is added to the dollar price at settlement.4FINRA. FINRA Rule 11620 – Computation of Interest The IRS treatment tracks that logic. If you buy a bond between interest dates, the accrued-interest portion of the price is treated as a return of capital rather than interest income, and it reduces your cost basis. If you sell between dates, the accrued portion of the sale price is interest income for that year.5Internal Revenue Service. Publication 550 (2025) Investment Income and Expenses
Taxes on Coupon Interest
Interest from coupon bonds is generally taxable as ordinary income in the year it becomes due and payable. That means each coupon payment gets reported for the year you were entitled to it, whether or not you actually spent the cash.5Internal Revenue Service. Publication 550 (2025) Investment Income and Expenses
Municipal bonds are the main exception. Interest from bonds issued by state and local governments is generally excluded from federal income tax under IRC Section 103(a).6Internal Revenue Service. Module B Introduction to Federal Taxation of Municipal Bonds The exclusion doesn’t apply to every muni: certain private activity bonds, arbitrage bonds, and federally guaranteed bonds are taxable. But for the ordinary general-obligation bond from a city or state, coupon interest is tax-free federally and often tax-free at the state level as well.
If you buy a coupon bond at a market discount and later sell it or hold it to maturity, the gain attributable to that discount is treated as ordinary interest income rather than a capital gain.5Internal Revenue Service. Publication 550 (2025) Investment Income and Expenses There’s a small carve-out. The de minimis rule lets you treat the discount as a capital gain if it’s less than 0.25% of face value for each full year remaining to maturity.7Internal Revenue Service. Publication 1212 (12/2025) Guide to Original Issue Discount (OID) Instruments Anything below that line gets capital-gain treatment.
Coupon Bonds vs. Zero-Coupon Bonds
Zero-coupon bonds sit at the opposite end of the category. They pay no interest along the way. Instead, they’re sold at a steep discount to face value, and the investor’s entire return arrives as the full face amount at maturity.8Investor.gov. Zero Coupon Bond A zero might cost $3,500 today and pay $10,000 in 20 years, with nothing in between.9FINRA. The One-Minute Guide to Zero Coupon Bonds
That structure removes reinvestment risk because there are no coupons to reinvest. But it stretches duration. All the return is back-loaded to maturity, so zeros are far more sensitive to interest rate changes than coupon bonds of the same maturity.
Zeros also carry a tax twist. The IRS treats the gap between the purchase price and face value as original issue discount, a form of interest that accrues annually.7Internal Revenue Service. Publication 1212 (12/2025) Guide to Original Issue Discount (OID) Instruments You owe tax on that imputed interest every year, even though no cash arrives until maturity.9FINRA. The One-Minute Guide to Zero Coupon Bonds This “phantom income” is the reason zeros are typically held in retirement accounts, where the annual accrual doesn’t trigger a bill.
Main Risks for Coupon Bond Investors
Interest rate risk is the one most investors notice first. When rates rise, the market price of your bond falls, and the longer your duration, the steeper the drop. Sell before maturity and you may take a real loss. Hold to maturity and rate moves matter mostly for what you can earn when you reinvest each coupon.
Reinvestment risk follows from that. Each coupon payment has to go somewhere. If rates have fallen since you bought the bond, the best available reinvestment rate may be lower than your original coupon rate. Over a long holding period, reinvesting at lower rates can pull your total return below the yield to maturity you started with.
Credit risk is the possibility that the issuer simply doesn’t pay. A bankruptcy or a municipal default can cost you coupon payments, principal, or both. Credit risk varies widely across the market. A U.S. Treasury and a junk-rated corporate bond are both coupon bonds, but they sit at opposite ends of the risk spectrum. The starting point for evaluating any bond is understanding who is responsible for repayment and assessing their financial condition.10SEC. Municipal Bonds Understanding Credit Risks Credit rating agencies assign letter grades to help with that judgment, but ratings are opinions, not guarantees, and they can change after you’ve bought in.