Corporate bond taxation at the federal level works in three layers: the interest you collect is taxed as ordinary income at rates from 10% to 37%, any profit from selling a bond before maturity is a capital gain, and higher-income investors owe an additional 3.8% net investment income tax on both. Unlike municipal bond interest, no portion of corporate bond income escapes federal tax. Discounts, premiums, and the account you hold the bond in can shift the timing and the rate, sometimes significantly.
How Interest Income Is Taxed
Corporate bond interest is taxed as ordinary income, not at the lower rates that apply to long-term capital gains or qualified dividends.1Internal Revenue Service. Topic No. 403, Interest Received The rate you pay depends on the bracket your total income lands in. For 2026, single filers face these federal rates:
- 10% on taxable income up to $12,400
- 12% on $12,401 to $50,400
- 22% on $50,401 to $105,700
- 24% on $105,701 to $201,775
- 32% on $201,776 to $256,225
- 35% on $256,226 to $640,600
- 37% on income over $640,600
Brackets are indexed for inflation each year.2Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 You owe tax on interest in the year you receive it or could withdraw it without penalty, even if the payments are reinvested automatically.
The gap between bonds and dividend stocks matters here. Qualified dividends top out at 20%. An investor in the 37% bracket pays that full rate on every dollar of corporate bond interest. When comparing yields against dividend-paying stocks, the after-tax numbers are what actually count.
Accrued Interest When You Buy Between Coupon Dates
If you buy a bond between coupon payments, part of the purchase price covers interest that accrued to the seller. Your brokerage will still report the full next coupon on Form 1099-INT. To avoid paying tax on money that was really part of your purchase, subtract the accrued interest you paid to the seller. The Schedule B instructions handle this by listing the full amount on line 1 and then showing “Accrued Interest” as a subtraction below.3Internal Revenue Service. Instructions for Schedule B (Form 1040)
Capital Gains and Losses When You Sell
Selling a corporate bond on the secondary market for more than your adjusted cost basis produces a capital gain. Holding period sets the rate. One year or less means short-term gain, taxed at ordinary income rates. More than one year qualifies for long-term rates: for 2026, 0% on taxable income up to $49,450 for single filers ($98,900 for married filing jointly), 15% above that, and 20% once income exceeds $545,500 for single filers ($613,700 for joint filers).4Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Rising interest rates push bond prices down, so selling before maturity in a rising-rate environment often means realizing a loss. Capital losses offset capital gains dollar for dollar. Excess losses can offset up to $3,000 of ordinary income per year ($1,500 if married filing separately), and anything more carries forward indefinitely.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses
The wash sale rule applies to bonds, not just stocks. If you sell a bond at a loss and buy a substantially identical security within 30 days before or after, the loss is disallowed and added to the basis of the replacement.5Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities Two bonds from the same issuer with the same coupon, maturity, and rating are almost certainly identical; a bond from a different issuer generally is not. The safest way to harvest a loss is to swap into a bond with clearly different terms.
Bonds Bought at a Discount
Buying below face value creates timing questions the coupon alone doesn’t answer. The rules split based on whether the discount came from the original issuance or from later trading.
Original Issue Discount
When a corporation issues a bond below its stated redemption price, the shortfall is original issue discount (OID). Federal law requires you to include a portion of that discount in income each year even though no cash arrives until a coupon or maturity.6Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount Investors sometimes call this phantom income. Each year’s recognized OID also lifts your cost basis, so you don’t pay tax twice on the same dollars when you finally sell or redeem.
A de minimis exception exists. If total discount is less than 0.25% of face value multiplied by the number of complete years to maturity, the OID is treated as zero.7Office of the Law Revision Counsel. 26 USC 1273 – Determination of Amount of Original Issue Discount A 10-year, $1,000 face bond issued at $980 has $20 of discount against a $25 threshold, so it clears the exception and the $20 gain at maturity is treated as capital gain instead.8Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses
Market Discount
Market discount is what you get when you buy an already-issued bond on the secondary market for less than its adjusted issue price. When the bond is sold or redeemed, any gain up to the accrued market discount is taxed as ordinary income rather than capital gain.9Office of the Law Revision Counsel. 26 USC 1276 – Disposition Gain Representing Accrued Market Discount Treated as Ordinary Income The same 0.25% de minimis rule can convert small discounts back to capital gain treatment.
By default, the tax is deferred until sale or redemption. You can elect to accrue and include market discount in income each year instead. That election binds you for all market discount bonds acquired afterward and can only be revoked with IRS permission.10Office of the Law Revision Counsel. 26 USC 1278 – Definitions and Special Rules The usual reason to accelerate is to avoid a lump of ordinary income in the sale year.
Bonds Bought at a Premium
Paying more than face value creates a bond premium. You can elect to amortize that premium over the bond’s remaining term, reducing the taxable interest you report each year and lowering your cost basis by the same amount.11Office of the Law Revision Counsel. 26 USC 171 – Amortizable Bond Premium The IRS requires the constant yield method, tied to your yield to maturity and compounding at the end of each accrual period.12eCFR. 26 CFR 1.171-2 – Amortization of Bond Premium
Skip the election and your higher basis stays put until sale or maturity, at which point you realize a capital loss for the difference. Amortizing is usually better because it offsets interest taxed at ordinary rates rather than generating a capital loss whose value depends on having gains to absorb it. Once elected, it applies to all your taxable bonds and any you acquire afterward, and revocation needs IRS approval.11Office of the Law Revision Counsel. 26 USC 171 – Amortizable Bond Premium
The 3.8% Surtax on Higher Earners
On top of ordinary and capital gains taxes, a 3.8% net investment income tax applies to individuals whose modified adjusted gross income crosses certain thresholds. The tax hits the lesser of net investment income or the amount MAGI exceeds the threshold.13Internal Revenue Service. Topic No. 559, Net Investment Income Tax The thresholds:
- $250,000 for married filing jointly or qualifying surviving spouse
- $200,000 for single or head of household
- $125,000 for married filing separately
These figures have not been indexed for inflation since the NIIT took effect in 2013, so more taxpayers cross them each year as wages rise.14Internal Revenue Service. Questions and Answers on the Net Investment Income Tax Both corporate bond interest and capital gains on bond sales count as net investment income.13Internal Revenue Service. Topic No. 559, Net Investment Income Tax A single filer over the threshold with $10,000 of bond interest would owe an extra $380 on that interest alone. The NIIT is calculated on Form 8960 and filed with your regular return.
Bonds Inside Retirement Accounts
Holding corporate bonds in a traditional IRA or 401(k) shifts the tax entirely to the distribution phase. Interest and gains accumulate without current tax; you pay ordinary income tax only when you withdraw.15Internal Revenue Service. Traditional IRAs That eliminates the phantom income problem with OID bonds and defers tax on every coupon payment while the account grows.
Roth IRAs go further. Qualified distributions, including all interest and gains, come out tax-free.16Internal Revenue Service. Roth IRAs Because corporate bond interest is taxed at the highest rates outside the account, bonds are among the most tax-efficient assets to hold inside a Roth.
The tradeoff runs the other way for losses. A bond that declines inside a retirement account produces no deductible loss. And in a traditional account, everything comes out as ordinary income at withdrawal, so long-term capital gains that would have qualified for 15% or 20% rates in a taxable account lose that preferential treatment.
State Taxes: A Boundary Worth Naming
This is federal territory. States tax corporate bond interest too in most cases, and unlike interest on U.S. Treasury bonds (exempt from state tax) or in-state municipal bonds (often exempt from both), corporate bond interest gets no state break. Nine states levy no individual income tax, so residents there avoid the additional cost. Everywhere else, state rates should factor into any comparison between corporate bonds, Treasuries, and munis.
Forms and Reporting
Your brokerage sends several forms covering different pieces. Form 1099-INT reports total interest received. Form 1099-OID reports the annual OID inclusion, even without any cash payment.17Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID Form 1099-B reports proceeds and cost basis on sales and redemptions.18Internal Revenue Service. Instructions for Form 1099-B (2026)
Interest flows onto Schedule B of Form 1040.3Internal Revenue Service. Instructions for Schedule B (Form 1040) Capital gains and losses from 1099-B go through Form 8949 and then Schedule D. If a bond sale involved market discount, the ordinary-income slice of the gain gets special handling on Form 8949. The IRS matches every reported number against what your broker sent, so mismatches almost always produce a notice. Cost basis on bonds acquired before broker reporting rules took effect is a common weak spot worth checking.