What it means
Buy a bond in the market for 900 that will repay 1,000, and the 100 gap is market discount: the bond's price defect, born after issue, usually because newer bonds pay more. The discount is real economic income, and the tax rules have strong opinions about what kind.
The distinction that matters is birth versus life. Original issue discount is priced in at birth, with its own accrual rules; market discount arises later, when a bond issued near par sinks in the secondary market as rates climb or credit sours.
The tax treatment is the trap. Rather than letting investors convert the accrual into lightly taxed capital gain, the rules generally treat accrued market discount as ordinary interest income on sale or redemption, a deliberate anti-conversion design the tax code's investment guidance, including IRS Publication 550, spells out.
The deferral is the consolation. Unlike original issue discount, market discount generally is not taxed year by year as it accrues; the bill arrives at disposition, which is why holders sometimes forget it exists until the 1099 reminds them.
The partial-election wrinkle adds choice. Investors may elect to include market discount in income annually as it accrues, converting surprise into schedule, useful for smoothing or for matching against interest expense on borrowing used to carry the bonds.
For buyers, the discount changes the real yield math. A discount bond's return splits into coupon plus accrual, taxed differently, so after-tax yield comparisons between premium, par, and discount bonds require the full treatment, not the quoted yield.
For issuers and traders, market discount is also information: the depth of the discount grades the market's verdict on rates and credit since issue, a live repricing of old promises. The durable takeaway: market discount is a bond's post-issue price shortfall, taxed mostly as ordinary income at exit.
Check accrued discount before selling, run after-tax yields when buying, and never mistake the gap for a free capital gain.
In practice
Real-world examples.
Example
An investor buys a 4 percent bond at 910 when new issues pay 6 percent; the 90 market discount accrues over the remaining life and is taxed as ordinary income at maturity.
Example
A holder sells a discount bond after two years and finds the gain split: the accrued discount taxed as interest, only the remainder, if any, treated as capital gain.
Example
A leveraged bond investor elects to accrue market discount annually, matching the income against the interest expense on the loan carrying the position.
Formula
Calculation
Accrued market discount ~ (purchase price vs adjusted issue price gap) x (days held / days from purchase to maturity); taxed as ordinary income at disposition unless annual accrual elected.
Worked example. An investor buys a bond with a $1,000 par value for $900, with five years to maturity. The market discount is $1,000 - $900 = $100, which accrues ratably at $100 / 5 = $20 a year.
- After two years the investor sells at $950. Total gain = $950 - $900 = $50.
- Accrued market discount = $100 x 2/5 = $40, taxed as ordinary income.
- The remaining $50 - $40 = $10 is capital gain.
- If the sale price were only $920, the total gain would be $20, so ordinary income is limited to that $20 and there is no capital gain.Case study
Seen in the real world.
Fictional example: Marchetti Family Office, a fictional investment vehicle, builds a ladder of beaten-down investment-grade bonds at 88 to 92 cents, attracted by the yields. Its accountant stops the celebration at the first review: the attractive exit gains are mostly accrued market discount, taxed as ordinary income at the family members' top rates, not the capital gains the broker's summary implied. The office reruns after-tax yields, shifts the discount bonds into a lower-bracket family trust, and elects annual accrual where borrowing carries the positions. The after-tax return improves by half a point annually, and the ladder's policy now opens with the question the broker never asked: what kind of income is this, and in whose hands?
Watch out
Common mistakes.
- Assuming the accrual is capital gain. Accrued market discount is generally ordinary income at sale or maturity; the conversion to capital gain is exactly what the rules exist to prevent.
- Confusing market with original issue discount. OID accrues annually from birth; market discount generally waits for disposition, and mixing the two mangles both planning and reporting.
- Comparing bonds on pre-tax yield. Discount, par, and premium bonds split returns into differently taxed parts; after-tax yield is the only honest comparison.
Questions
People also ask.
What is market discount on a bond?
The amount by which a bond's secondary-market price sits below its par or adjusted issue price, usually from rising rates or credit deterioration after issue.
How is it taxed?
Generally as ordinary interest income when the bond is sold or matures, not capital gain; investors may elect annual accrual instead, as IRS Publication 550 explains.
How does it differ from original issue discount?
OID is priced in at issue and accrues annually; market discount arises later in the secondary market and is generally taxed at disposition, though elections and exceptions apply.
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