What Is a Zero-Coupon Bond?

A zero-coupon bond is a bond that pays no periodic interest at all. Instead of collecting coupon payments over the bond’s life the way an ordinary bond does, the holder buys it at a price below its face value and receives the full face value when it matures — the discount itself is the return.

How the discount replaces the coupon

An ordinary bond pays a stated coupon rate at regular intervals — say, twice a year — and returns the principal (face value) at maturity. A zero-coupon bond skips the periodic payments entirely. If a zero-coupon bond has a face value of $1,000 and ten years to maturity, it might be issued or trade at $600; the investor pays $600 now and receives $1,000 at maturity, with no cash changing hands in between. The $400 difference is the return, compounding implicitly over the life of the bond rather than being paid out along the way.

This makes the math on a zero-coupon bond simpler in one sense — there’s a single cash inflow to think about — but it also means the entire return is locked into the price paid today relative to a fixed future payment, which makes zero-coupon bond prices unusually sensitive to changes in prevailing interest rates.

Why they’re more sensitive to rate changes

Bond duration measures how much a bond’s price moves in response to a change in interest rates, and it’s heavily influenced by when the bond’s cash flows arrive. A coupon-paying bond returns some cash before maturity, which shortens its effective duration relative to its stated term. A zero-coupon bond returns nothing until the very end, so its duration is essentially equal to its full time to maturity — the longest duration, and therefore the most interest-rate sensitivity, that a bond of a given maturity can have.

In practice, this means a 20-year zero-coupon bond will swing in price far more dramatically in response to rate changes than a 20-year coupon bond with the same face value and credit quality. That volatility cuts both ways: it amplifies losses when rates rise, and amplifies gains when rates fall.

Zero-coupon bonds vs coupon bonds

	Zero-coupon bond	Coupon bond
Periodic payments	None	Regular interest payments
Purchase price	Sold at a deep discount to face value	Typically sold near face value
Return	Difference between purchase price and face value at maturity	Coupon payments plus return of principal
Interest-rate sensitivity	Highest for a given maturity	Lower — cash flows arrive sooner
Reinvestment risk	None — nothing to reinvest until maturity	Yes — each coupon must be reinvested at prevailing rates

That last row matters more than it looks. A coupon bond exposes an investor to reinvestment risk: every coupon payment has to be put back to work somewhere, and if rates have fallen since the bond was issued, those reinvested coupons earn less than originally assumed. A zero-coupon bond has no coupons to reinvest, so its actual return, if held to maturity, matches the yield implied at purchase exactly — a predictability some investors specifically buy zero-coupon bonds for.

Why the discount is still taxed as income

One counterintuitive feature of zero-coupon bonds, at least in taxable accounts in many jurisdictions, is that the implied interest accrues and is taxed annually even though no cash is actually received until maturity — a feature often called “phantom income.” This is one reason zero-coupon bonds are frequently held inside tax-advantaged retirement accounts rather than ordinary brokerage accounts, where the mismatch between taxable income and actual cash received doesn’t create a funding problem for the tax bill.

Common uses

Zero-coupon bonds are often used for goal-based investing where the target date and target amount are both known in advance — funding a specific future expense with a lump sum that matches it, rather than a stream of income. Long-dated government zero-coupon bonds (sometimes created by “stripping” the coupons off an ordinary bond, which is where the term “STRIPS” comes from in U.S. Treasury markets) are also used by institutional investors managing liabilities that come due on a specific known date, since a zero-coupon bond’s single cash flow can be matched precisely against a single future obligation.

They’re less useful for investors who want current income, since by design there isn’t any until maturity — which is the opposite of what products like callable bonds or convertible bonds are typically bought for.

The takeaway

A zero-coupon bond trades periodic interest payments for a simple discount-to-face-value structure: buy low, collect the full face value at maturity, and let the difference be the entire return. That simplicity comes with the highest interest-rate sensitivity of any bond structure at a given maturity, no reinvestment risk, and — in taxable accounts — a tax bill on income you haven’t actually received yet, which is why they show up most often in retirement accounts and in liability-matching strategies built around a specific future date.