Zero coupon bonds are fixed-income securities sold at a deep discount that pay no periodic interest; instead of mailing you interest checks along the way, the issuer pays the full face value in a single lump sum at maturity. A $1,000 bond might sell for $600 today and return $1,000 in ten years, with the $400 gap making up your entire return. The structure suits investors who want a predictable payout on a specific future date, but it comes with an unusual tax rule that surprises many first-time buyers: the IRS taxes the annual growth even though no cash arrives until the end.
How Zero Coupon Bonds Work
The lifecycle is simple. You buy at a price well below face value, hold the bond, and collect the full face value on the maturity date. Nothing arrives in between.
Because there are no interest payments to reinvest, these bonds eliminate what bond investors call reinvestment risk. With a traditional bond, you get semiannual interest checks that have to be put back to work, and if rates have fallen since you bought in, you reinvest at lower returns. A zero coupon bond locks in the return at purchase.1FINRA.org. The One-Minute Guide to Zero Coupon Bonds
As time passes, the bond’s value drifts upward toward the face amount through a process called accretion. That drift is a bookkeeping figure, not cash in hand. It simply reflects the shrinking gap between today and the maturity date.
How the Price and Yield Are Calculated
The price of a zero coupon bond is the present value of its future face-value payment:
Price = Face Value ÷ (1 + r)n
Here r is the annual interest rate expressed as a decimal, and n is the number of years to maturity. At a 5% market rate and a 10-year term, a $1,000 face-value bond prices at roughly $614 ($1,000 ÷ 1.0510).
Run the formula the other way and you get yield-to-maturity, the annualized return from holding the bond to the end:
Yield-to-Maturity = (Face Value ÷ Price)1/n − 1
Pay $614 for a $1,000 bond maturing in 10 years and your yield-to-maturity is roughly 5% per year. That figure is the compound annual growth rate from purchase to payout.
If market rates rise after you buy, the resale price of your bond falls. Newer bonds offer better yields, and yours looks less attractive by comparison. Falling rates push the resale price up. That inverse relationship applies to all bonds, but it hits zero coupon bonds harder than most.
Why Prices Swing So Much When Rates Move
Bond investors measure price sensitivity to rate changes using duration. For a bond that pays periodic interest, duration is shorter than the maturity because those interim payments return some value early. A zero coupon bond delivers its entire value at the very end, so its duration equals its full maturity. A 20-year zero has a duration of 20 years, making it more sensitive to rate moves than a 20-year bond paying a 5% coupon.
Practically, a one-percentage-point rise in rates will cut a 20-year zero coupon bond’s price by roughly 20%, far more than a 20-year coupon bond would drop. It cuts both ways. If rates fall, the same zero gains more than its coupon-paying counterpart. Holding to maturity makes the interim swings irrelevant, because the issuer still owes you the full face value at the end. Anyone who might need to sell early should understand how sharply rates can move the resale price.
The Tax Catch: Phantom Income
Even though no cash arrives until maturity, the IRS requires you to pay tax each year on the bond’s annual growth. Under the Original Issue Discount rules, you must include in gross income the portion of the discount that accrues during each tax year you hold the bond.2Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount
The annual accrual is calculated using the constant yield method, which means the taxable amount grows each year the way compound interest does. In year one, the accrual equals the original purchase price times the yield-to-maturity. In year two, it equals the purchase price plus the first year’s accrual, again times the yield, and so on. Buy a 10-year bond for $614 at a 5% yield and you would report roughly $31 in imputed interest the first year ($614 × 5%), then about $32 the second year ($645 × 5%), with the figure climbing every year.2Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount
This is what investors mean by phantom income. You owe tax on money you have not received. The imputed interest is taxed as ordinary income at federal rates from 10% to 37%, depending on your overall taxable income.3Internal Revenue Service. Tax Inflation Adjustments for Tax Year 2026
If the total OID for the year is at least $10, the issuer or the broker holding the bond for you sends Form 1099-OID, which shows the exact amount to report.4Internal Revenue Service. About Form 1099-OID, Original Issue Discount Each year’s reported OID also increases your cost basis in the bond, which matters if you sell before maturity.
Skipping the report is expensive. Failing to include imputed interest can trigger back taxes, interest on the unpaid amount, and a failure-to-pay penalty of 0.5% of the unpaid tax for each month it remains outstanding, up to a maximum of 25%.5Internal Revenue Service. Failure to Pay Penalty
Selling Before Maturity
You are not locked in until the maturity date. Zero coupon bonds trade on the secondary market, and you can sell at any time. The price depends on current rates, and the tax treatment depends on your adjusted cost basis.
Your adjusted basis is not the price you originally paid. It is the purchase price plus all the OID you have already reported as income during the years you held the bond. Sell above the adjusted basis and the difference is a capital gain. Sell below it and the difference is a capital loss.6Internal Revenue Service. Guide to Original Issue Discount (OID) Instruments
Suppose you bought at $614, held for three years, and reported $97 in OID over that time. Your adjusted basis is now $711. Sell for $750 and you have a $39 capital gain. Sell for $690 and you have a $21 capital loss. Because the OID was already taxed as ordinary income each year, you are not taxed on it again at sale; only the difference between the sale price and your adjusted basis counts.6Internal Revenue Service. Guide to Original Issue Discount (OID) Instruments
Ways to Reduce the Tax Bite
The phantom-income problem makes zero coupon bonds costly to hold in a taxable brokerage account. A few strategies soften or remove the annual hit.
Holding these bonds inside a traditional IRA or 401(k) defers tax on the imputed interest until you take retirement withdrawals. Holding them in a Roth IRA can eliminate that tax entirely, provided the account’s distribution requirements are met. With no interim cash flow to reinvest, the securities fit naturally in a retirement account where phantom income stops being a problem.
Zero coupon bonds issued by state and local governments generally qualify for the federal tax exclusion on municipal bond interest. Under federal law, interest on state and local bonds, including the imputed interest on a zero coupon municipal bond, is excluded from gross income for federal tax purposes.7Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds The exclusion does not cover certain private activity bonds or arbitrage bonds. Where the bond is a private activity bond, the imputed interest may still count toward the alternative minimum tax calculation even though the regular federal income tax does not apply.
Treasury STRIPS are exempt from state and local income taxes, as other U.S. Treasury securities are. For an investor in a high-tax state, that exemption can meaningfully improve after-tax return compared to a corporate zero coupon bond offering the same pre-tax yield.
Who Issues Zero Coupon Bonds
Three main categories of issuer sell zero coupon bonds, and each carries a different risk profile.
U.S. Treasury STRIPS
STRIPS, short for Separate Trading of Registered Interest and Principal of Securities, are the most widely held zero coupon bonds. Financial institutions create them by taking a standard Treasury note or bond and separating its interest payments from its principal repayment, then selling each piece as its own zero coupon security. Because they are backed by the full faith and credit of the federal government, STRIPS carry virtually no credit risk.8TreasuryDirect. FAQs About Treasury Marketable Securities
Most STRIPS created from notes and non-callable bonds are themselves non-callable, so the government cannot force early redemption and your yield stays locked for the full term.1FINRA.org. The One-Minute Guide to Zero Coupon Bonds STRIPS derived from older callable Treasury bonds can themselves be callable, so check the terms of the specific security before buying.8TreasuryDirect. FAQs About Treasury Marketable Securities
Municipal Zero Coupon Bonds
States, cities, and counties issue zero coupon bonds to fund infrastructure such as schools, highways, and water systems.9Internal Revenue Service. Module B Introduction to Federal Taxation of Municipal Bonds Overview The federal tax exemption on interest, covered above, makes them particularly attractive to investors in higher tax brackets. Some municipal zero coupon bonds are callable, so the issuer can redeem them before the stated maturity date, potentially at a moment when reinvesting the proceeds at a comparable yield is difficult.
Corporate Zero Coupon Bonds
Companies issue zero coupon bonds to raise capital without the immediate cash burden of periodic interest payments. The trade-off for investors is higher credit risk. If the company defaults, bondholders recover only what is available after secured creditors are paid first. Data from 1970 through 2008 shows that senior unsecured bonds, the category most corporate zero coupon bonds fall into, recovered an average of roughly 37% of face value after default, compared with about 56% for secured debt.10Federal Reserve Bank of Kansas City. What Determines Creditor Recovery Rates?
Risks Beyond the Tax Rule
Alongside phantom income, zero coupon bonds carry several risks worth weighing before buying.
- Interest rate risk. With duration equal to full maturity, price swings from rate changes are larger than for coupon bonds of the same term. A long-dated zero can lose 15% to 20% of its market value from a one-point rate increase. Holding to maturity makes this irrelevant; selling early does not.
- Inflation risk. The face value at maturity is fixed in nominal dollars. If inflation runs higher than expected, the purchasing power of that payout shrinks. A $1,000 payment 20 years out buys much less if annual inflation averages 4% instead of 2%.1FINRA.org. The One-Minute Guide to Zero Coupon Bonds
- Call risk. Some corporate and municipal zero coupon bonds are callable, and the issuer typically calls when rates fall. If your bond is called, you receive the call price rather than the full face value at maturity, and you reinvest at lower prevailing rates.
- Credit risk. Treasury STRIPS carry negligible default risk, but corporate and some municipal zeros depend on the issuer’s financial health. Because the entire return arrives at the end rather than through periodic payments, a default late in the bond’s term can wipe out years of expected gains at once.
- Liquidity risk. Not every zero coupon bond trades actively on the secondary market. Thinly traded issues may require accepting a lower price to find a buyer, and broker markups on secondary-market bond trades can further cut proceeds.
When These Bonds Fit
Zero coupon bonds work best for investors with a specific future cash need on a known date, such as college tuition or a retirement milestone. They deliver a predictable lump sum without the chore of reinvesting interest along the way. Holding them inside a tax-advantaged account, or choosing tax-exempt municipal issues, addresses the biggest drawback. Matching the bond’s maturity to the target date sidesteps the interest rate sensitivity that dominates any shorter holding period.