Bond taxation is not one rule. A Treasury security, a corporate bond, a municipal bond and a bond fund can produce different tax forms and different federal or state treatment. The timing of tax can also differ from the timing of cash: some discount income is reportable before it is paid.
This guide does not determine your liability. Tax law, inflation adjustments, thresholds and your filing circumstances change the result. Use the current IRS forms and instructions or a qualified tax professional for a return.
Separate four kinds of tax-relevant amounts
- Stated interest and coupons. Often reported as ordinary interest income unless a specific exemption applies.
- Original issue discount (OID) and other accruals. Some discount is treated as interest over the security's life, including certain zero-coupon instruments.
- Market discount and bond premium. Buying an existing bond below or above par can trigger special accrual, basis and election rules.
- Sale, redemption or maturity proceeds. A capital gain or loss may arise after adjusting basis and accounting for amounts treated as interest.
These categories can overlap in the tax reporting for one security. The difference between purchase price and sale price is not always entirely a capital gain.
A high-level tax map
| Security or income | Federal income tax | State/local income tax | Common timing feature |
|---|---|---|---|
| Treasury bills, notes and bonds | Interest generally taxable | Generally exempt | Bill discount and coupon timing follow specific rules |
| Series EE and I savings bonds | Interest generally taxable; conditional education exclusion | Exempt | Generally defer until proceeds are received, or elect annual reporting |
| Corporate bonds | Interest generally taxable | Generally taxable under applicable state rules | Coupon, OID, premium and market-discount rules may apply |
| Municipal bond interest | Often exempt, but not universally | Often state-specific; out-of-state interest may be taxable | Exemption does not automatically cover capital gains |
| TIPS | Coupon and inflation-related principal adjustments generally enter federal calculations | Generally exempt as U.S. government obligations | Inflation adjustment can be taxable before cash principal arrives |
| Bond ETF or mutual fund | Tax character flows through distributions; share sales can create gains/losses | Depends on underlying income and state rules | No personal bond maturity; fund reporting determines distributions |
Treasury securities: federal taxable, state and local exempt
Interest from direct obligations of the U.S. government is generally subject to federal income tax but exempt from state and local income tax. This applies across many Treasury instruments, although the calculation and timing of income differ.
- Notes and bonds: semiannual coupons are interest; a sale before maturity can create additional gain or loss.
- Bills: the acquisition discount and maturity proceeds require rules relevant to short-term government obligations.
- TIPS: both coupon payments and increases in inflation-adjusted principal can enter the annual federal calculation.
- STRIPS and zero-coupon structures: OID can accrue annually even without a cash coupon.
State exemption does not mean “after-tax yield”
Suppose a taxable account receives $500 of qualifying Treasury interest. The $500 generally enters federal interest income but is excluded from state and local taxable interest. This does not mean the investor keeps $500: the federal liability depends on total income, deductions and current law. Comparing after-tax yields requires personal inputs and should not use a generic assumed bracket.
EE and I savings bonds
Savings bond interest is generally federally taxable and exempt from state and local income tax. Owners generally choose between two reporting methods:
- Deferral: report the accumulated interest in the year the bond is redeemed, matures or otherwise pays the interest. Most owners use this method.
- Annual reporting: report each year's accrued interest even though it has not been received. A final Form 1099-INT can include interest reported in earlier years, so records are needed to avoid reporting it twice.
TreasuryDirect makes Form 1099-INT available for the year in which deferred interest is paid. It does not issue a 1099-INT every year merely because the bond accrued value under the deferral method. Ownership and reissue rules determine who reports the interest.
The education interest exclusion
Qualifying EE and I savings bonds used for eligible higher-education expenses may qualify for a federal exclusion. This is not a broad tax exemption for every education-related use. Requirements can include the bond's issue date, the owner's age and registration, qualified expenses, eligible institutions, filing status and income in the redemption year. Married filing separately generally prevents this exclusion under the standard rules.
IRS Publication 970 and Form 8815 provide the operative calculation and phaseouts. Because limits are indexed and expenses may need adjustment for other education benefits, use the documents for the exact tax year rather than copying a prior-year threshold.
Corporate bonds
Corporate bond interest is generally ordinary income for federal tax purposes and is generally taxable under state rules. A company's stock dividends and its bond interest are not the same type of payment: bond interest does not become “qualified dividend” income.
A taxable sale before maturity can generate a capital gain or loss, but market-discount rules may treat some or all of an apparent gain as ordinary interest income. OID, acquisition premium and bond premium rules can affect annual income and basis. The holding period matters for capital gain classification after the relevant interest components are accounted for.
Municipal bonds: exemption with conditions
Interest on many state and local government bonds is excluded from federal gross income, but the word “municipal” is not enough to conclude that all income is tax-free.
- Federal exceptions: certain private-activity bonds and other categories can be taxable or relevant to alternative minimum tax calculations.
- State treatment: interest from bonds issued within the investor's home state may receive different treatment from out-of-state bonds. Local rules vary.
- Capital gains: selling a tax-exempt bond at a profit can still produce a taxable capital gain.
- Social Security and other calculations: tax-exempt interest can still be reportable and enter other tax computations even when excluded from regular gross income.
- Market discount and premium: special rules can affect basis and the character of a sale result.
The security's offering documents and current IRS guidance matter. Do not infer personal federal or state exemption solely from a brokerage label such as “muni.”
OID, market discount and premium
Original issue discount
OID arises when a debt instrument's stated redemption price at maturity exceeds its issue price by more than a permitted minimum. Zero-coupon bonds are an intuitive example: a holder may pay less than face value and receive no annual cash coupon, yet a portion of the discount can be taxable each year. IRS Publication 1212 explains OID instruments and calculations.
Market discount
Market discount generally arises when a bond is purchased in the secondary market below its adjusted issue price or stated principal, subject to detailed rules. A later sale or redemption can require part of the gain to be treated as ordinary income rather than entirely as capital gain.
Bond premium
A bond bought above its basis-related threshold may involve premium amortization. The rules and elections differ between taxable and tax-exempt bonds and can affect both current income and basis. Broker reporting may not capture every taxpayer election or circumstance, so retained calculations matter.
Bond ETFs and mutual funds
A bond fund does not pass through a single bond's maturity to its shareholders. The fund receives interest, trades holdings and distributes income and gains according to its own reporting. Investors can face two levels of tax-relevant activity:
- Fund distributions: statements identify taxable interest, tax-exempt interest, capital gain distributions and other categories.
- Share sales: selling ETF or mutual fund shares can create a capital gain or loss based on the investor's adjusted basis and holding period.
A fund holding Treasuries may be eligible for a state exemption for the portion attributable to qualifying U.S. government obligations, but the percentage and reporting process vary. A fund labeled “tax-exempt” can still distribute taxable gains, and its share price can decline.
Taxable and tax-advantaged accounts are different
Interest, gains and losses inside an IRA or qualified retirement plan generally follow that account's tax framework rather than the annual taxable-account rules described here. The account type does not change the security's market risk, but it can change when tax is recognized and whether a capital loss is currently usable. Early distribution, required distribution and plan-specific rules are separate questions.
Documents and records to retain
- Trade confirmations showing dates, prices, accrued interest and fees.
- Form 1099-INT, 1099-OID, 1099-B and consolidated brokerage statements.
- TreasuryDirect taxable transaction summaries and the actual Form 1099.
- Records of savings bond interest already reported in prior years.
- Adjusted basis, premium amortization and market-discount calculations.
- Offering documents supporting municipal tax treatment.
- Fund annual tax statements and U.S. government income percentages.
- Form 8815 support and education-expense records when claiming that exclusion.
A broker's “taxable transaction summary” may not itself be the official form. TreasuryDirect specifically distinguishes its summary from Form 1099.
Frequently asked questions
Are I Bonds free of federal income tax?
Generally no. Interest is federally taxable unless a specific exclusion, such as the conditional education exclusion, applies. State and local income tax exemption is separate.
Are municipal bonds always completely tax-free?
No. Federal and state treatment varies by bond and taxpayer. Capital gains can be taxable, and some interest categories have special federal or alternative minimum tax treatment.
Can I owe tax on a bond without receiving cash interest?
Yes. OID, TIPS inflation adjustments, certain market-discount rules and the annual savings-bond reporting method can create reportable amounts without an equivalent current cash payment.
Is every gain from selling a bond a capital gain?
Not necessarily. Accrued interest and market-discount rules can cause part of the proceeds or gain to be treated as ordinary income. Basis adjustments also matter.
Does a Treasury bond ETF get the same state tax treatment as a Treasury bond?
Not automatically. The portion of fund distributions attributable to qualifying government obligations may be eligible, subject to fund reporting and state rules. Share-sale gains are separate.
Official tax sources
- IRS Publication 550 — Investment Income and Expenses: interest, savings bonds, market discount, premium, gains and losses.
- IRS Publication 1212 — Guide to Original Issue Discount Instruments.
- TreasuryDirect — Tax information for EE and I Bonds: deferral, annual reporting and 1099-INT.
- IRS Publication 970 — Tax Benefits for Education: savings bond education exclusion.
- IRS — About Form 8815: exclusion of interest from qualifying savings bonds.
Reviewed November 5, 2026. Use publications for the tax year being filed; thresholds and rules may have changed.