Coupon, Face Value, Maturity: The Three Numbers That Define a Bond

The previous article established the bond as a tradeable loan. This one takes apart the terms that specify it: the face value that is repaid, the coupon that is paid along the way, and the maturity that ends the contract. The reason this needs a full article rather than a glossary entry is that each of the three is routinely confused with something adjacent — face value with price, coupon rate with yield, maturity with the actual timing of a bond's cash flows — and those three confusions account for a large share of all misunderstandings about fixed income. Get these straight and the pricing article becomes easy; get them wrong and nothing in this pillar will make sense.

Face value: what gets repaid, and why it is not the price

Face value (par value, principal, nominal, redemption value) is the amount the issuer repays at maturity — conventionally a round number per bond, with typical denominations varying by market and issuer type; retail-accessible government issues often come in small units while corporate bonds are frequently issued in larger denominations that put single bonds out of reach for small investors, one practical reason many individuals hold bonds through funds instead. Three points do the work here. Face value is fixed; price is not. Once issued, a bond trades in a secondary market at whatever price buyers and sellers agree, which may be above or below face value — and the two are so routinely conflated that bond markets adopted a convention to keep them apart: prices are quoted as a percentage of face value, so a bond quoted at 98 costs 98% of its face value, and one quoted at 104 costs 104%. A bond trading below par is at a discount, above par at a premium, and exactly at 100 is at par. Face value is the base for the coupon calculation, not the price you paid — a 5% coupon on $1,000 face value pays $50 a year to whoever holds it, whether they bought at 90 or 110, which is precisely why price and yield diverge. And face value is what you get back, so buying at a discount means a capital gain at maturity built into the purchase, while buying at a premium means a capital loss at maturity — both entirely expected, both part of the return calculation the yield-measures article handles. One further wrinkle worth knowing: for some instruments the principal itself is not fixed in the way described — inflation-linked bonds adjust it with a price index, and amortising structures repay it in instalments rather than at the end.

Coupon: the payment, the rate, and the accrued-interest mechanics

The coupon is the interest, and the word does double duty: it names both the rate (5%) and the payment ($50 on a $1,000 bond). The name is a fossil — bonds were once physical certificates with detachable coupons clipped and presented for payment, and the term outlived the paper. Four features specify it. The rate is set at issue and, for a conventional fixed-rate bond, never changes — which is the entire source of interest-rate risk, since the world's rates move while your coupon does not. Frequency is conventional and regional: semi-annual payment is standard in US practice, annual in much of continental Europe, and the difference matters more than it sounds, because two bonds with identical stated rates but different payment frequencies do not deliver identical returns — money received sooner can be reinvested sooner. Variants exist: floating-rate notes reset periodically against a reference rate plus a spread, so their coupons rise and fall with market rates (which reduces price sensitivity to rates while introducing uncertainty about the payments themselves); zero-coupon bonds pay no interest at all and are sold at a deep discount instead, the subject of their own article; and step-up and payment-in-kind structures alter the schedule in defined ways. And the day-count and accrued-interest machinery — the piece that surprises first-time bond buyers. Coupons are paid on set dates, but bonds trade every day, so a buyer between payment dates compensates the seller for the interest earned since the last payment: accrued interest. Hence two prices in every bond transaction — the clean price (quoted, excluding accrued interest) and the dirty price (what actually settles, clean plus accrued). The exact accrual depends on the bond's day-count convention (30/360, actual/actual, and others, varying by market and instrument type), a piece of plumbing that rarely changes a decision but reliably explains why the amount debited from an account differs from the price on the screen.

Maturity: the end date, and why "ten-year bond" is ambiguous

Maturity is the date the principal is repaid and the bond ceases to exist. Two distinctions carry real weight. First, original maturity versus remaining maturity: a bond issued as a thirty-year obligation in 2010 is, in 2026, a sixteen-year bond — and it is the remaining term that determines its price behaviour, which is why "a ten-year bond" in market conversation usually means ten years remaining, and why the newly issued benchmark for each tenor (the "on-the-run" issue in US parlance) is watched separately from older bonds of similar remaining life. Second, and more important: maturity is not the same as the timing of a bond's cash flows. A bond paying coupons returns money throughout its life, so its economic sensitivity to interest rates is governed not by the final date alone but by the weighted timing of all payments — the concept called duration, which this pillar treats separately because it is the single most useful number in fixed income and the one most often confused with maturity. Conventional shorthand divides the spectrum into short (roughly up to three years), intermediate (three to ten), and long (beyond ten) — bands whose exact boundaries vary by source, in the same way market-cap tiers do. Below one year, instruments are usually called bills or paper rather than bonds and belong with the cash instruments the banking pillar covered. At the far end sit very long and even perpetual issues, which have no maturity date at all and pay indefinitely. Two features also break the clean picture: call provisions let the issuer end the bond early, so a "2040 bond" callable from 2030 may effectively be a ten-year instrument — which is why professionals quote yield to worst alongside yield to maturity — and sinking-fund arrangements retire portions early on a schedule. As always in this pillar: the stated maturity is a term, and the document is the instrument.