Coupon Rate

How coupons work

A bond with a 5% coupon rate and $1,000 face value pays $50 per year in interest, typically split into two $25 semi-annual payments. The coupon is fixed at issuance and doesn't change regardless of what happens to market interest rates afterward.

The term "coupon" is historical: bonds used to be issued as paper documents with detachable coupons that holders physically clipped and submitted to receive interest payments. Modern bonds are electronic; the name remains.

Coupon rate vs. yield

These two terms refer to related but different concepts:

• Coupon rate — the percentage of face value paid as annual interest. Fixed at issuance.
• Yield — the actual return based on what you paid for the bond.

If you buy a 5% coupon bond at par ($1,000), your yield equals the coupon rate (5%). If you buy it at a discount ($900) because rates have risen, your yield is higher (~5.5% current yield, plus capital gain to maturity). If you buy at a premium ($1,100), your yield is lower.

Yield to maturity (YTM) captures the full picture: coupon income plus any capital gain or loss between purchase price and face value at maturity, expressed as an annualized return.

Why coupons exist at fixed rates

A fixed coupon makes the bond a predictable cash-flow instrument: investors know exactly what they'll receive on every payment date through maturity. That predictability is the appeal — it lets pension funds, insurance companies, and individuals match liabilities to a known income stream.

The trade-off is interest-rate exposure. If rates rise after issuance, the bondholder is locked into receiving below-market coupons; if rates fall, locked into above-market coupons. Bond prices in secondary markets move inversely to rates to compensate.

Variations

Most bonds pay fixed coupons, but variants exist:

• Zero-coupon bonds — no periodic payments. Issued at a deep discount; the bondholder's return comes entirely from the gap between issue price and face value at maturity. US Treasury "STRIPS" are an example.
• Floating-rate notes — coupons reset periodically based on a reference rate (formerly LIBOR, now SOFR). Reduces interest-rate risk; better matches the issuer's cost to current market conditions.
• Step-up bonds — coupon rises at predetermined dates.
• Inflation-linked bonds (TIPS) — face value adjusts with inflation; coupon is paid on the adjusted face. Coupon rate is real (after-inflation) rather than nominal.
• Convertible bonds — pay a coupon plus offer the option to convert to stock at a set ratio. Coupons are typically lower because the conversion option has value.

How to interpret a coupon

When evaluating a bond's coupon rate:

• Compare to current market rates for similar bonds. A 5% coupon issued today is unremarkable; the same 5% issued in 2020 (when rates were 1-2%) traded at a premium.
• Consider the issuer's credit rating. A 5% Treasury and a 5% high-yield corporate are very different propositions. The high-yield coupon is paying for default risk.
• Watch the "current yield" if buying secondary. Coupon / current price = current yield. The richer measure (YTM) accounts for the capital gain or loss to maturity.

In a low-rate world

Coupon rates have varied dramatically across decades. US 10-year Treasury coupons in the early 1980s were over 14%; in 2020 they hit historic lows around 0.5%. Long-duration bonds issued at very low coupons in 2020-2021 lost significant value when rates rose in 2022-2023 — a cohort of bonds that experienced one of the worst fixed-income drawdowns on record. Investors who bought 30-year Treasuries at sub-1.5% yields lost over 40% of value before rates stabilized.

The lesson: coupon rate alone doesn't capture risk. Duration (sensitivity to rate changes) and the level of starting yield together determine how violently a bond's price can move.