What it means
Bonds are normally issued at or near their face value, often $1,000, and pay a regular coupon. A deep-discount bond changes that balance by shifting most of the return into the final repayment.
The price therefore sits far below par, sometimes at only 50% or 60% of face value. There are two very different reasons a bond can trade this way.
Some are designed with a low coupon from the start, which is a structuring choice rather than a warning sign. Others fall to a deep discount because interest rates have risen sharply, or because investors now doubt the issuer will repay in full.
Telling those two apart is the whole job. A low-coupon bond from a strong issuer offers a fairly predictable capital gain, whereas a distressed bond at the same price is really a bet on recovery.
Comparing the yield with bonds of similar maturity and credit quality is the quickest way to see which one you are holding. Deep-discount bonds are unusually sensitive to interest rate changes.
Because most of the cash arrives at maturity, the effective average time to payment, known as duration, is long, so prices swing more when rates move. That works in the holder's favour when rates fall and against them when rates rise.
Tax treatment often catches people out. Many tax systems require the holder to accrue the discount as income over the life of the bond even though no cash is received until maturity.
Investors therefore tend to hold these bonds inside tax-sheltered accounts wherever that is possible.
In practice
Real-world examples.
Example
An investor buys a $1,000 face value zero coupon government bond for $740 with six years left to run. No interest arrives in the meantime, but $1,000 is repaid at maturity, giving a gain of $260 on the original outlay.
Example
A pension scheme with a known $10,000,000 payout due in ten years buys deep-discount bonds maturing on the same date, so the redemption amount matches the liability. The absence of coupons removes the problem of reinvesting interest at unknown future rates.
Example
A distressed retailer's bonds fall to $410 per $1,000 of face value after a profit warning. A specialist fund buys them as a recovery play, accepting that a restructuring could pay back far less than par.
Formula
Calculation
Approximate yield to maturity = [Annual coupon + (Face value - Price) / Years to maturity] divided by [(Face value + Price) / 2].
A corporate bond with a face value of $1,000 pays a 2% coupon, so $20 a year, has 8 years left to run and trades at $620.
Annual accretion of the discount = ($1,000 - $620) / 8 = $380 / 8 = $47.50 a year. Adding the coupon gives $20 + $47.50 = $67.50 of annual return.
Average invested capital = ($1,000 + $620) / 2 = $810. Approximate yield to maturity = $67.50 / $810 = 0.0833, or about 8.3% a year, against a current yield of only $20 / $620 = 3.2%.Case study
Seen in the real world.
Thornbury Utilities is an illustrative issuer invented for this glossary. It issued 15-year bonds carrying a 1.5% coupon at a price of $700 per $1,000 of face value, deliberately structured so that most of the return arrived at maturity.
A local authority pension fund bought $5,000,000 of face value for $3,500,000, matching a known pension payment due in the same year. Over the life of the bonds it expected $75,000 a year in coupons plus $5,000,000 back at maturity, giving a capital gain of $1,500,000.
Halfway through the term, interest rates rose two percentage points and the market value of the holding fell by about 13%, which looked alarming in the annual accounts. Because the fund intended to hold to maturity and the issuer stayed solvent, the paper loss reversed as the bonds pulled back towards par. This fictional example shows why duration matters even when the final cash outcome is fixed.
Watch out
Common mistakes.
- Assuming a low price means a bargain, when a deep discount often reflects genuine doubt about repayment.
- Judging the return by the coupon alone and missing the capital gain that makes up most of the yield.
- Forgetting that the discount may be taxed as income each year even though no cash is received until maturity.
Questions
People also ask.
Are deep-discount bonds the same as junk bonds?
No, a bond can trade at a deep discount purely because of a low coupon and high market interest rates, with no credit concern at all.
Why are they more sensitive to interest rates?
Because most of the cash arrives at maturity, the average time to payment is longer, and longer duration means bigger price swings.
Do they suit income investors?
Rarely, since the payoff is concentrated at maturity and there is little or no regular cash along the way.
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