An OID fee is the gap between what you pay for a bond or other debt instrument and what the issuer promises to pay you when it matures, and the IRS treats that entire gap as interest income rather than a discount or capital gain. Buy a bond for $900 that pays $1,000 at maturity, and the $100 difference is your original issue discount. You owe tax on portions of it every year you hold the bond, even though no money reaches you until the end. Investors call this “phantom income,” and it regularly catches holders of zero-coupon bonds and long-term CDs off guard.
What Counts as an OID Fee
Under federal tax law, original issue discount equals the excess of a debt instrument’s stated redemption price at maturity over its issue price.1Office of the Law Revision Counsel. 26 USC 1273 – Determination of Amount of Original Issue Discount The redemption price includes everything you’re owed at the end, except any interest the issuer pays you on a fixed schedule during the bond’s life. The issue price is typically the first price at which the issuer sells a meaningful amount of the debt to the public; for private issues, it’s simply what the first buyer paid.
The IRS classifies this gap as a form of interest, not a purchase discount or a processing fee.2Internal Revenue Service. Publication 1212 – Guide to Original Issue Discount (OID) Instruments Whatever a contract calls the amount, the tax treatment follows the economics: you lent money, and the extra you receive at the end compensates you for the time your money was tied up. That means ordinary income tax rates apply, not the lower rates available for long-term capital gains.
When the Discount Is Too Small to Count
Not every discount triggers OID treatment. If the gap between redemption price and issue price is small enough, the tax code treats the OID as zero. The threshold is 0.25% of the stated redemption price at maturity, multiplied by the number of complete years until the bond matures.1Office of the Law Revision Counsel. 26 USC 1273 – Determination of Amount of Original Issue Discount For a 10-year bond with a $1,000 face value, the cutoff is $25 (0.25% × $1,000 × 10). A discount below that amount is ignored for OID purposes.
The practical effect is meaningful: a de minimis discount gets treated as capital gain when you redeem or sell the bond, rather than as ordinary interest income taxed at your regular rate. That’s a real difference for investors in higher brackets. The issue price and redemption price appear in the bond prospectus, so check those numbers before assuming annual OID reporting applies.
Where You’ll Run Into OID
Zero-coupon bonds are the clearest example. Because they pay nothing during their life, the entire return comes from the spread between the discounted purchase price and the face value at maturity. Every dollar of that spread is OID.
Stripped bonds and Treasury receipts work the same way. When an investment bank separates a bond’s principal from its interest coupons and sells each piece individually, each piece becomes its own zero-coupon obligation with its own OID.
Certificates of deposit with terms longer than one year can also carry OID when the bank defers all interest until the CD matures.2Internal Revenue Service. Publication 1212 – Guide to Original Issue Discount (OID) Instruments You won’t see any interest until the end, but you still owe tax on the accrued portion each year. Many CD holders don’t realize this until an unexpected 1099-OID arrives from their bank.
Short-term debt (maturing in one year or less) works differently. None of its stated interest counts as “qualified stated interest” for OID purposes.3eCFR. 26 CFR 1.1273-1 – Definition of OID Cash-method taxpayers holding short-term obligations generally don’t have to report OID until they actually receive payment or sell.
How Much You Owe Each Year
If you hold an OID instrument for more than one tax year, you can’t wait until maturity to report the income. Federal law requires you to include a portion of the total OID in your gross income each year, regardless of whether any cash changes hands.4Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion of OID in Income This is the phantom income: a real tax bill backed by no real cash.
The IRS requires a specific calculation called the constant yield method.5eCFR. 26 CFR 1.1272-1 – Current Inclusion of OID in Income You multiply the bond’s adjusted issue price at the start of each accrual period by the yield to maturity, then subtract any qualified stated interest paid during that period. What’s left is your OID accrual.
One feature of this method trips people up. It front-loads less OID into the early years and allocates progressively more to later years, because the adjusted issue price grows each year as OID accrues. Your annual tax bill on the same bond gets bigger over time. Most investors won’t run these numbers themselves; their broker or bank handles it. But understanding the upward trajectory helps with cash-flow planning, because the year with the largest OID inclusion is usually the year just before maturity.
How Basis Rises With Each Year’s Accrual
Each year you report OID income, your tax basis in the instrument increases by the same amount.4Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion of OID in Income This step prevents double taxation. Buy a zero-coupon bond for $600, report $50 in OID the first year, and your adjusted basis rises to $650. When you eventually redeem the bond at $1,000, your taxable gain is measured against your adjusted basis at that point, not the original $600.
The same logic applies if you sell the bond on the secondary market before maturity. Your gain or loss is measured against the adjusted basis, which accounts for all the OID you’ve already been taxed on. Failing to track the basis increase year over year is one of the most common mistakes, and it leads to overpaying tax when you finally cash out.6Internal Revenue Service. Publication 550 – Investment Income and Expenses
Buying an OID Bond on the Secondary Market
When you buy a bond after its original issue date, the math changes. If you pay more than the bond’s adjusted issue price (the original issue price plus all OID that has already accrued), the excess is called an “acquisition premium.” You reduce your annual OID inclusion by a proportionate share of that premium, which lowers your phantom income each year.2Internal Revenue Service. Publication 1212 – Guide to Original Issue Discount (OID) Instruments
The IRS formula is straightforward. Divide the total OID by the number of months from original issue to maturity to get a monthly OID figure, then calculate the monthly share of your acquisition premium the same way. Subtract the premium portion from the OID portion, and the result is what you include in income each month. If your acquisition premium completely offsets the OID, your annual inclusion drops to zero.
A separate concept called “market discount” applies when you buy a bond below its adjusted issue price on the secondary market. Market discount and OID are taxed under different rules. A bond can have both if it was originally issued at a discount and then fell further before you bought it. The key difference: market discount generally is not required to be reported annually. The tax consequences typically hit when you sell the bond or it matures. Confusing the two leads to reporting errors.
When OID Isn’t Taxable
Two significant exceptions spare investors from the phantom-income tax bill.
Municipal Bonds
OID on tax-exempt obligations like municipal bonds accrues as tax-exempt interest.7Office of the Law Revision Counsel. 26 USC 1288 – Treatment of Original Issue Discount on Tax-Exempt Obligations You still track the accrual using the constant yield method to properly adjust your basis, and you may receive a 1099-OID that you need to report as tax-exempt interest. But you owe no federal income tax on the accrued amount. The de minimis rule does not apply to tax-exempt bonds, so even tiny discounts get OID treatment for basis purposes.
U.S. Savings Bonds
Series EE and Series I savings bonds give you a choice. You can report the interest annually as it accrues, or defer reporting until you cash the bond or it reaches final maturity.8TreasuryDirect. Tax Information for EE and I Bonds Most individual holders defer, which avoids the phantom-income problem entirely. If you switch from deferring to reporting annually, you must report all the interest accrued in prior years in the year you switch. Going the other direction (from annual reporting to deferring) requires filing IRS Form 3115.
Reporting OID on Your Tax Return
If OID of at least $10 accrues on an instrument you hold during the year, the financial institution or broker that manages the account must send you Form 1099-OID by January 31 of the following year.9Internal Revenue Service. About Form 1099-OID, Original Issue Discount The form reports the OID allocated to your holding period for that tax year.
On your federal return, OID is reported as interest income on Schedule B (Form 1040), line 1, alongside your other taxable interest.10Internal Revenue Service. Instructions for Schedule B (Form 1040) If you paid an acquisition premium and need to reduce the reported OID, you enter an adjustment on the same schedule with the notation “OID Adjustment.” Your broker typically handles the calculation, but if you purchased the bond outside a brokerage account, the burden falls on you.
Even without a 1099-OID, you’re still required to calculate and report the income. Brokers change, accounts get transferred, and small institutions occasionally miss the filing requirement. Your purchase records and the bond prospectus give you what you need to run the constant yield calculation.
What Happens If You Skip It
OID appears on information returns filed with the IRS, so unreported phantom income is easy for the agency to catch. A mismatch between your 1099-OID and your tax return is a standard trigger for automated notices.
Underreporting OID income exposes you to the accuracy-related penalty of 20% of the underpaid tax.11Internal Revenue Service. Accuracy-Related Penalty The IRS treats failure to report income that appears on an information return as an indicator of negligence. You can avoid the penalty by showing reasonable cause and good faith, but “I didn’t know I owed tax on money I never received” is not a defense the IRS finds persuasive. Interest on the unpaid tax accrues from the original due date regardless.