Key Takeaways
Bond taxation has more layers than almost any other asset class. The coupon interest is just the starting point; the rules governing discounts, premiums, inflation adjustments, and secondary-market purchases each operate independently and can each produce taxable income on a different schedule — sometimes with no cash in hand to pay the bill. Understanding which rule applies to which bond, and when, is the difference between properly planning around a fixed-income portfolio and discovering an unexpected tax hit in April.
Direct answer: Interest from corporate and Treasury bonds is taxed as ordinary income in the year received. Treasury interest is exempt from state and local tax; most municipal bond interest is exempt from federal tax and often state tax, though private-activity bonds can trigger the AMT. Original issue discount (OID) creates phantom income taxable annually even without cash. TIPS inflation adjustments are also taxable phantom income. Market discount on secondarily purchased bonds is reclassified as ordinary income at sale. Selling any bond before maturity triggers capital gain or loss on the principal portion. Series I and EE savings bonds offer deferral and a potential education exclusion.
- Interest income from taxable bonds is ordinary income, reported on Form 1099-INT in the year received.
- Treasury bond interest is state- and local-tax-exempt; municipal bond interest is generally federal-tax-exempt (and often state-exempt for in-state bonds), but AMT can apply to private-activity bonds.
- OID and TIPS inflation adjustments both produce phantom income — taxable in the year accrued, even with no cash received — reported on Form 1099-OID.
- Bonds bought at a market discount in the secondary market carry ordinary income risk at sale, not capital gains treatment, on the discount portion.
- Selling a bond before maturity creates a capital gain or loss on the principal; accrued interest is treated separately as ordinary income.
- Bond premium amortization on taxable bonds is an optional deduction that reduces interest income; on muni bonds, amortization is mandatory and reduces basis.
Interest Income: The Ordinary Income Default
The baseline rule for bond taxation is straightforward: coupon interest is ordinary income, taxable at the federal level in the year you receive it, regardless of your holding period or any other consideration. The issuer or paying agent reports the amount on Form 1099-INT and that figure flows to Schedule B of your individual return. Unlike qualified dividends or long-term capital gains, which benefit from preferential rates, bond interest has no equivalent reduced rate — it hits your marginal bracket directly.
This applies whether you hold individual bonds or bond mutual funds and ETFs. Fund distributions attributable to ordinary interest income are themselves taxable as ordinary income in the year distributed, not when you eventually sell your fund shares. The tax follows the economic event — receipt of interest — rather than the sale event. That timing difference matters for portfolio planning: a bond fund making large monthly interest distributions generates a recurring ordinary-income tax liability regardless of whether you reinvest those distributions.
One timing nuance: if you buy a bond between coupon payment dates, you pay the seller for accrued interest that has built up since the last payment. When the issuer makes the next full coupon payment to you, the portion attributable to accrued interest you already paid for is a return of your cost, not income. Your 1099-INT should reflect only the net interest attributable to your actual holding period, but always verify against your purchase confirmation, since reporting errors on accrued interest are common.
Practical checklist
- Verify that your 1099-INT correctly excludes accrued interest you paid the seller at purchase — if the full coupon is reported, you may be overpaying.
- For bond funds, track monthly or quarterly ordinary-income distributions and set aside estimated tax payments if the amounts are material.
- Remember ordinary income rates apply regardless of how long you've held the bond — there is no long-term preferential rate for bond interest.
Treasury Bonds: Federal Yes, State No
U.S. Treasury bonds, notes, and bills occupy a specific position in the tax hierarchy. Interest is fully subject to federal income tax, just like corporate bond interest, and must be reported on your federal return. What distinguishes Treasuries is the state and local tax exemption: under federal law, interest from obligations of the United States government cannot be taxed by state or local governments. That exemption is automatic and applies to direct Treasury obligations — T-bills, T-notes, T-bonds — as well as TIPS and Series I/EE savings bonds.
The practical value of the state exemption depends entirely on your state's income tax rate. For an investor in a state with a 9% or 10% income tax rate at the top bracket, the state exemption on Treasury interest is a genuine after-tax advantage over otherwise equivalent corporate bond interest that would be fully taxable at both levels. For an investor in one of the states with no income tax (Florida, Texas, Nevada, and others), the exemption has no value at all.
Note that the state exemption covers direct Treasury obligations but not every government-adjacent investment. Interests in some government agency bonds and government-sponsored enterprise (GSE) securities — such as Fannie Mae, Freddie Mac, or Federal Home Loan Bank securities — are treated differently under state law and may not qualify for the exemption in all states. Always confirm the specific security's tax treatment with your state's revenue agency or a tax adviser before assuming the exemption applies.
Municipal Bonds: The Federal Exemption, AMT Risk, and Tax-Equivalent Yield
Municipal bonds issued by state and local governments are the fixed-income asset most associated with tax-advantaged income. Interest from most munis is exempt from federal income tax — not just taxed at a reduced rate, but entirely excluded from gross income under the Internal Revenue Code. In addition, if the bond is issued in the same state where you live, the interest is typically also exempt from that state's income tax, creating a double exemption that makes in-state munis particularly attractive to high-bracket investors in high-tax states.
The AMT exception for private-activity bonds
The blanket "muni bonds are tax-free" rule has an important carve-out: private-activity bonds (PABs). These are munis issued to finance facilities used primarily by private entities — think bonds issued for airports, privately operated hospitals, student loan programs, or certain industrial development projects. Congress decided that private-activity bonds should not enjoy the same treatment as bonds for purely governmental purposes, so interest on PABs is excluded from regular federal income tax but added back as a preference item for purposes of the Alternative Minimum Tax (AMT).
High-income investors who are subject to AMT under Form 6251 will owe federal tax on their PAB interest despite the nominal exemption. Before buying any muni bond, check its offering documents or ask your broker whether it is a private-activity bond. This information is also disclosed in bond fund prospectuses for any fund holding PABs. For investors consistently subject to AMT, excluding private-activity bonds from muni holdings — or limiting them — is a straightforward way to preserve the tax advantage.
Tax-equivalent yield: comparing munis to taxables
Because muni yields look lower than corporate yields on a face-value comparison, investors need a way to compare them on an equal after-tax basis. The tax-equivalent yield (TEY) formula converts a muni's yield into the pretax yield a taxable bond would need to match it:
Tax-Equivalent Yield = Muni Yield ÷ (1 − Combined Marginal Tax Rate)
A worked example: suppose an investor in the 37% federal bracket lives in a state with a 9.3% income tax rate and is considering an in-state muni bond yielding 3.5%. The combined marginal rate on taxable income (ignoring the state deduction for simplicity) is approximately 46.3%, so:
TEY = 3.5% ÷ (1 − 0.463) = 3.5% ÷ 0.537 ≈ 6.52%
A taxable bond yielding less than 6.52% would leave this investor worse off after tax than the 3.5% muni. The higher the combined marginal rate, the more attractive munis become relative to equivalent taxable bonds. Investors in lower brackets — or in states with no income tax — will find the TEY hurdle much lower and taxable bonds comparatively more competitive.
Capital gains and other muni tax considerations
Federal exemption applies to interest income from munis, not to every tax event associated with them. Selling a muni bond before maturity at a profit generates a capital gain taxable under normal capital gains rules. OID on tax-exempt bonds does accrete tax-free at the federal level, but you still need to track your adjusted basis. And as noted above, PAB interest can trigger AMT. The "tax-free bond" shorthand is a simplification that matters most for coupon interest; the full picture is more nuanced.
Corporate Bonds: Fully Taxable
Corporate bonds are the simplest category from a tax standpoint, though not in a favorable way. Interest is fully taxable as ordinary income at both the federal level and at the state and local level — there are no exemptions, exclusions, or preferential rates analogous to those available for Treasury or municipal bonds. Every coupon payment appears on your Form 1099-INT and is includable in gross income at your marginal rate.
The full-taxability point matters most in after-tax yield comparisons. A corporate bond yielding 5.5% looks more attractive than a Treasury bond yielding 4.5% on a pretax basis, but once state income tax applies to the corporate yield and is excluded from the Treasury yield, the after-tax advantage narrows. At a 9% state rate, the after-tax corporate yield drops to roughly 5.00% while the Treasury stays at 4.50% — a much narrower spread than the headline numbers suggest.
High-yield (junk) bonds and investment-grade corporate bonds are taxed identically from an income-tax standpoint — the credit risk differences don't create different tax treatment. However, the higher likelihood of a default or restructuring in high-yield bonds raises the practical importance of understanding how bond losses and debt cancellation income work, topics that go beyond the scope of this guide.
Original Issue Discount (OID): Phantom Income and Annual Accrual
Original issue discount is the tax code's name for the difference between a bond's face value (what you'll receive at maturity) and the price at which it was originally sold to the public — when that original sale price was less than face value. A bond issued at $900 that pays $1,000 at maturity has $100 of OID. The tax rules treat that $100 as interest income, but rather than letting the investor defer all of it to maturity, they require the investor to include a portion of the OID in ordinary income each year the bond is held, proportionally over the bond's life using a constant-yield accrual method.
Why OID produces phantom income
The annual OID inclusion creates phantom income: you report and owe tax on interest income you haven't actually received in cash. For most coupon bonds with a relatively small OID, the annual accrual amounts are modest, but for zero-coupon bonds — which are issued at a deep discount and pay no periodic interest at all, returning only the full face value at maturity — the phantom income problem becomes large. A zero-coupon bond with a 20-year maturity might accrue thousands of dollars of OID annually that the investor must report and pay tax on out of other funds, even though nothing has been received.
How OID is reported and how basis adjusts
Your broker or the bond issuer reports your annual OID amount on Form 1099-OID. Critically, each year's OID inclusion increases your adjusted tax basis in the bond by the same amount. This prevents double-taxation: when the bond matures and you receive the full face value, your basis has stepped up to reflect all the OID you already paid tax on over the years, so only any additional appreciation over face value (rare for plain-vanilla bonds) triggers additional tax at maturity.
Zero-coupon bond example
Illustrative scenario — for education only.
Suppose an investor buys a newly issued 10-year zero-coupon Treasury bond with a $10,000 face value for $6,139 (implying a 5% yield). The $3,861 discount is OID. The constant-yield method calculates the accrual for the first year as approximately 5% of $6,139, or $307 — that amount is phantom ordinary income the investor must report, even though no payment arrives. In year two, basis has increased to $6,446, so the next year's accrual is 5% of $6,446, or $322. This compounds annually until the bond matures at $10,000 with the investor's basis having stepped up to exactly $10,000 and no further gain to report.
Zero-coupon bonds held inside tax-deferred accounts (IRAs, 401(k)s) sidestep the phantom-income problem entirely, since tax is deferred until withdrawal regardless of annual accruals. That makes tax-advantaged accounts the natural home for zero-coupon and high-OID bonds for tax-sensitive investors.
Practical checklist
- Before buying any bond at a significant discount, ask whether it carries OID — a bond's original issue price and whether OID applies is documented in the prospectus or bond confirmation.
- Review Form 1099-OID each year and confirm your broker has increased your cost basis accordingly — basis errors on OID bonds are a common source of double-taxation at sale or maturity.
- Consider holding zero-coupon bonds and other deep-discount bonds inside IRAs or 401(k)s to eliminate the annual phantom income problem.
Market Discount: The Secondary Market Trap
Market discount is distinct from OID and catches many investors off guard. It arises when you purchase a bond in the secondary market at a price below its adjusted issue price (roughly, face value for a bond with no OID, or the accreted OID-adjusted basis for a discounted bond). Market discount is not a function of how the bond was originally structured; it's a function of what happened to interest rates or the issuer's credit standing after issuance — if rates rose after a bond was originally sold, its price in the secondary market will have fallen below face value, and the person who buys it at that depressed price has acquired a market discount bond.
How market discount is taxed
The IRS does not allow market discount to be treated as a capital gain when you sell the bond or receive principal repayment. Instead, the amount of market discount that has accrued since your purchase date is reclassified as ordinary income at the time of sale, principal payment, or maturity. Only the portion of any gain above the accrued market discount (if any) qualifies for capital gains treatment. This reclassification applies regardless of how long you've held the bond.
A de minimis exception exists: if the market discount is very small — generally less than 0.25% of the bond's face value multiplied by the number of years remaining to maturity — it can be treated as a capital gain rather than ordinary income. A 10-year bond with a $1,000 face value would qualify for de minimis treatment if the total market discount was less than $25 (0.25% × 10 × $1,000). Discounts above that threshold fall fully into the ordinary-income-reclassification regime.
The annual accrual election
By default, market discount is recognized at sale or maturity. You may elect, however, to accrue market discount into income annually — in which case each year's ratable accrual is reported as ordinary income and increases your basis. This election can be useful if you expect your tax rate to be higher in future years, prefer to spread the income recognition over time, or want a higher basis to limit future capital gains. Once made, the election applies to all market discount bonds you hold or acquire, not just the specific bond on which you made it — so the decision has broader consequences than it might initially appear.
Bond Premium Amortization: Reducing Interest Income on Premium Bonds
When you pay more than face value for a bond — a premium — you're paying extra for the above-market coupon rate that bond carries. Over time, as the bond approaches maturity and its price converges to face value, you'll effectively lose that premium. The tax code allows, and in some cases requires, you to account for that premium reduction systematically rather than recognizing a capital loss at maturity.
Taxable bonds: optional election
For taxable bonds (corporate, Treasury), amortizing the premium is optional. If you elect to amortize, you reduce your reported interest income each year by the amortized premium amount, calculated using the constant-yield method. This is generally advantageous: it converts what would otherwise be a capital loss at maturity into current-year reductions of ordinary income, which is typically more valuable because it offsets income taxed at your highest marginal rate. The trade-off is that each year's amortized premium reduces your cost basis in the bond, so at maturity your basis will equal face value and you'll have no deductible capital loss — the tax benefit was already taken as reduced interest income along the way.
If you do not elect to amortize premium on a taxable bond, you receive the full coupon in income each year and recognize a capital loss when the bond matures at face value (below your purchase price). Capital losses are less flexible than ordinary deductions — they can only offset capital gains plus $3,000 of ordinary income per year — so the election to amortize is usually beneficial for investors expecting to hold to maturity.
Tax-exempt bonds: mandatory amortization
For tax-exempt (municipal) bonds purchased at a premium, amortization is not optional — it is mandatory. You must amortize the premium each year using the constant-yield method and reduce your cost basis accordingly. The amortization does not generate a deduction (because the underlying interest income is already excluded from taxable income), but failing to reduce your basis will result in an artificially large capital loss deduction at sale or maturity, which is impermissible. Tracking muni bond basis carefully over multi-year holding periods, including mandatory premium amortization, is essential for accurate reporting.
Capital Gains on Bonds: Selling Before Maturity
Bonds don't have to be held to maturity, and any time you sell before maturity you trigger a capital gain or capital loss — subject to several specific adjustments that distinguish bond sales from stock sales.
Separating principal gain from accrued interest
The sale proceeds you receive for a bond include two components: the market price for the bond's principal value, and any accrued interest that has built up since the last coupon payment date. These two components are taxed differently. The accrued interest portion is ordinary income in the year of sale, reported on your 1099-INT (or equivalent). The principal proceeds are measured against your adjusted tax basis to determine your capital gain or loss — short-term if you held the bond for one year or less, long-term if held longer, with the preferential long-term rate applying in the latter case.
In practice, your bond confirmation should break out the total proceeds between principal and accrued interest. If it does not, you'll need to calculate the accrued interest yourself based on the coupon rate and days since the last payment date to ensure you're allocating the proceeds correctly.
Basis adjustments that affect the gain calculation
Your adjusted basis at the time of sale is not necessarily your original purchase price. It has been increased by any OID you included in income (which prevents double-taxation of the OID), and decreased by any bond premium you amortized (on taxable bonds where you made the amortization election). For market discount bonds, the accrued market discount that hasn't yet been recognized as ordinary income will be reclassified at sale, effectively converting that portion of gain from capital gain to ordinary income rather than adjusting basis.
The layering of these adjustments — OID basis increases, premium amortization basis decreases, market discount reclassification — means that basis tracking for bonds held several years can become complex. Maintaining a spreadsheet or relying on your broker's cost-basis reporting (and verifying it) is essential, since brokerage 1099-Bs for bonds have historically had higher error rates than those for equities.
TIPS: Treasury Inflation-Protected Securities and Phantom Income
Treasury Inflation-Protected Securities are Treasury bonds with a twist: their principal is adjusted semi-annually to track the Consumer Price Index. When inflation rises, the principal value of the TIPS increases. Coupons are paid on the inflation-adjusted principal, so the coupon payment grows with inflation too. The intent is to preserve purchasing power — you hold a security that won't be eroded by inflation the way a fixed nominal bond would be.
Why the inflation adjustment creates a tax problem
The catch is that the IRS taxes both the coupon interest and the inflation adjustment to principal as ordinary income in the year they occur. The coupon is straightforward — it's cash you actually received. The inflation adjustment to principal is phantom income: you haven't received any cash for it, and you won't until you sell the bond or it matures, but you owe tax on it in the current year as if it were interest income. Your broker reports both components on your 1099-OID or 1099-INT.
In a high-inflation environment, this can create a scenario where the total tax due on a TIPS position in a taxable account significantly exceeds the cash coupons you received. In an extreme year with 8% inflation, an investor holding $100,000 of TIPS might owe income tax on $8,000 of phantom principal adjustments in addition to tax on the relatively small cash coupons, even though none of the $8,000 has arrived in their brokerage account. The investor must fund that tax liability out of other assets.
The solution: hold TIPS in tax-deferred accounts
The clean solution to the TIPS phantom income problem is to hold TIPS exclusively inside tax-deferred accounts — traditional IRAs, 401(k)s, or similar vehicles — where annual tax on accruals is irrelevant because tax is deferred until withdrawal. In taxable accounts, TIPS behave as an inflation hedge that also creates a cash-flow mismatch: rising inflation protects the real value of the investment while simultaneously generating a larger annual tax bill that must be paid from somewhere else. For investors who want inflation protection in taxable accounts, I-bonds (discussed below) sidestep the phantom income problem entirely.
Series I and EE Savings Bonds: Deferral and the Education Exclusion
Series I and EE savings bonds are non-marketable U.S. government savings bonds purchased directly from TreasuryDirect.gov. Their tax treatment differs meaningfully from other Treasuries and from each other in some respects, but they share two features that make them distinctive among fixed-income investments: an interest deferral option and a potential education exclusion.
Deferring the tax
Unlike most bonds, where interest must be reported in the year received (or OID in the year accrued), savings bond holders may defer recognizing interest income until the earlier of the bond's redemption, its final maturity date, or the holder's death. In practice, this means a holder can buy an I-bond and pay no income tax on the interest for up to 30 years (the final maturity), or until they cash it in — whichever comes first. This deferral is automatic; there is no election required to defer, though you may alternatively elect to report interest annually if that's advantageous for your situation (a useful choice if, for example, you want to spread income recognition into lower-bracket years).
Series I bonds currently earn a composite rate made up of a fixed base rate and a variable inflation adjustment set twice a year. Importantly, because I-bonds are not marketable securities — you can't sell them on an exchange — they have no market discount or premium considerations, and the inflation adjustments do not create the same taxable phantom income problem as TIPS. The inflation-adjustment interest simply accrues and is deferred along with the rest of the interest until redemption.
The education exclusion
Owners of Series EE or I bonds issued after 1989 may be able to exclude some or all of the interest from income under the Education Savings Bond Program, provided the bonds are redeemed and the proceeds used to pay qualified higher education expenses — tuition and required fees at eligible institutions — in the same year. The exclusion is subject to income phase-outs that apply at relatively high income levels, and the bonds must be held by someone who was at least 24 years old when they were purchased. Because of the phase-out limits, the exclusion is primarily valuable for middle-income families; very high earners may be phased out entirely. Careful planning around the year of bond redemption and expense payment is essential to capture the exclusion.
Practical checklist
- Hold I-bonds and Series EE bonds for the full deferral advantage — redeeming early (especially in high-income years) forfeits the timing benefit.
- If planning to use the education exclusion, verify your income level against current phase-out thresholds and confirm the bonds were purchased when the owner was at least 24.
- Remember that savings bonds are per-person annual purchase limits ($10,000 per Social Security number per year for electronic I-bonds) — plan accordingly for multi-year accumulation strategies.
Misconceptions Versus Reality
| Misconception | Reality |
|---|---|
| Municipal bonds are always completely tax-free | Muni interest is generally federal-tax-exempt, but private-activity bonds can trigger AMT; capital gains on muni sales are always taxable; mandatory premium amortization reduces basis |
| OID only matters at maturity when you get your money back | OID is taxable annually as it accrues, creating phantom income each year with no cash received; basis steps up annually to match, preventing double-taxation at maturity |
| TIPS are a clean inflation hedge with no tax complications | TIPS phantom income — annual tax on principal inflation adjustments you haven't received in cash — makes taxable-account TIPS a cash-flow liability in high-inflation years |
| Selling a bond at a profit is always a capital gain | Market discount bonds sold at a gain may have a significant portion reclassified as ordinary income, not capital gain, equal to the accrued market discount |
| Treasury bonds are tax-free | Treasury interest is fully subject to federal income tax; only state and local taxes are exempted |
| A bond bought at a premium and held to maturity creates a capital loss you can deduct | If you elect to amortize the premium on a taxable bond, the tax benefit has already been taken as reduced ordinary income; no additional loss is recognized at maturity |
Common Mistakes in Bond Taxation
Several mistakes recur consistently in bond tax reporting, most of them products of incorrect basis tracking or misapplied rules.
Not tracking adjusted basis on OID bonds. When a bond has OID that you've included in income annually, each year's inclusion increases your cost basis. Investors who lose track of those basis adjustments — or whose brokers' systems fail to update them correctly — end up reporting a capital gain at maturity or sale that overstates the actual gain. The correct basis at maturity of a bond held to term is its face value (for a bond with no premium or market discount), not the original purchase price. Verify your broker's reported basis against your own records before filing.
Treating accrued interest paid at purchase as ordinary income received. When you buy a bond between coupon dates, you pay the seller for interest that has accrued since the last payment. That payment is your cost — not income — and when the first full coupon arrives, the accrued-interest portion is a return of what you paid, not taxable income. If your 1099-INT shows the full coupon rather than just the income attributable to your holding period, you'll overreport ordinary income. The fix is a subtraction of the accrued interest paid on Schedule B with an explanatory notation.
Ignoring the market discount rule on secondary purchases. Investors who buy bonds at a discount in the secondary market frequently assume the gain at maturity is a capital gain. The market discount rule reclassifies the accrued discount portion as ordinary income, which can mean a higher effective tax rate on the gain than expected — and a surprise at tax time. Run the math before purchase on whether the yield advantage of a discounted bond accounts for the ordinary-income treatment of the discount.
Holding TIPS in taxable accounts without planning for the phantom income cash flow. The phantom income issue on TIPS in taxable accounts is well-known but still regularly surprises investors who add TIPS for inflation protection without modeling the annual cash-flow mismatch. In years of high inflation, the tax bill can be substantial relative to the cash coupons. Budget explicitly for the phantom income tax, or relocate TIPS to tax-deferred accounts.
Pre-Year-End Bond Tax Checklist
- Identify any bonds with OID you hold outside tax-deferred accounts — confirm your broker's 1099-OID amounts and verify basis is being updated correctly.
- Review any TIPS positions in taxable accounts — estimate the annual principal inflation adjustment and set aside funds for the resulting tax liability.
- Check secondary-market bond purchases for market discount above the de minimis threshold — note which positions will produce ordinary income rather than capital gains at sale.
- Decide whether to make the annual market discount accrual election if you hold significant market-discount bonds and expect a tax-rate change.
- Review premium bonds and confirm the amortization election status for taxable bonds — ensure amortized premium is reducing your reported interest income, not being missed.
- For muni bonds, verify whether any holdings are private-activity bonds that could affect AMT exposure — check Form 6251 projections before year-end if applicable.
- Confirm the adjusted basis of any bonds you plan to sell reflects all OID accruals and any premium amortization to avoid overpaying capital gains tax.
- If planning to redeem Series I or EE bonds for education expenses, verify the redemption year matches the year of qualified expense payment and confirm income is below phase-out limits.
Frequently Asked Questions
Is bond interest always taxed as ordinary income?
Generally yes, but with meaningful exceptions. Interest from taxable bonds — corporate bonds, most agency bonds, and Treasury bonds — is taxed as ordinary income at the federal level in the year it is received, reported on Form 1099-INT. Interest from most municipal bonds is exempt from federal tax and often from state tax as well. Treasury bond interest is exempt from state and local tax but fully subject to federal tax. So the answer depends on the bond type: corporate bonds are fully taxable at every level, Treasuries dodge state and local tax, and munis largely skip federal tax entirely.
Do I owe tax on OID even if I receive no cash?
Yes. OID is treated as phantom income: the IRS requires you to report and pay tax on the accrued portion of the discount each year as ordinary income, even though you receive no actual cash until the bond matures or you sell it. Your broker or the bond issuer reports the annual OID amount to you on Form 1099-OID. The amount you include in income each year increases your tax basis in the bond, so you won't be double-taxed on the same amount when the bond matures — but you do owe tax annually on income you haven't received in cash.
Are municipal bonds completely tax-free?
Not always. Most muni bonds are exempt from federal income tax, and bonds issued within your own state are usually also exempt from that state's income tax. However, three exceptions matter: first, interest from private-activity bonds may be subject to the federal Alternative Minimum Tax (AMT), so high-income investors using Form 6251 need to check whether a specific muni is an AMT bond; second, capital gains from selling a muni bond before maturity are taxable just like gains on other investments; and third, OID on tax-exempt bonds creates federally tax-exempt OID accretion rather than taxable income, but the rules still require tracking it.
What is the tax-equivalent yield formula for comparing muni bonds to taxable bonds?
The formula is: Tax-Equivalent Yield = Muni Yield ÷ (1 − Your Marginal Federal Tax Rate). For example, a muni bond yielding 3.5% is equivalent to a 5.83% taxable yield for an investor in the 40% combined federal/state bracket (3.5% ÷ 0.60 = 5.83%). The formula shows what pretax yield a fully taxable bond would need to match the after-tax value of the muni. If you are also accounting for a state tax exemption on in-state munis, add the state rate to the denominator's combined rate. A muni that clears the tax-equivalent hurdle is genuinely preferable; one that doesn't may look attractive but underperforms a comparable taxable bond after taxes.
What is the market discount rule, and when does it trigger?
Market discount applies when you buy a bond in the secondary market at a price below its face value (par) — not because the bond was originally issued at a discount (that's OID), but because interest rates rose or the issuer's credit declined since issuance. The discount is the difference between what you paid and the stated redemption price at maturity. If that market discount exceeds a de minimis threshold (generally 0.25% of face value per year remaining to maturity), you must recognize the accrued market discount as ordinary income — not capital gain — when you sell the bond, receive principal, or the bond matures. You can elect to accrue the discount into income annually rather than waiting, which converts future ordinary income recognition into annual inclusions and may be useful if you expect to be in a lower bracket now than later.
How is selling a bond before maturity taxed?
Selling a bond before maturity triggers a capital gain or capital loss, but with important nuances. The gain or loss is calculated on the bond's principal value — your adjusted basis (original purchase price plus any OID or market discount already included in income) versus the sale proceeds attributable to principal. Accrued interest that has accumulated since the last payment date is treated separately: the buyer pays you for it and includes it in their own income; you exclude it from your gain calculation but do include it in your ordinary income. Short-term vs. long-term capital gain rates apply based on your holding period, just as with stocks. Note that if the bond carried a market discount you haven't yet accrued, the portion of gain equal to the accrued discount is reclassified from capital gain to ordinary income at sale.
What is the TIPS phantom income problem?
Treasury Inflation-Protected Securities adjust their principal value upward with the Consumer Price Index. That inflation adjustment increases the value of the bond, and the IRS taxes that increase as ordinary income in the year it occurs — even though you receive no cash for it until the bond matures or you sell it. This creates a phantom income situation similar to OID: you owe tax on inflation accruals you haven't pocketed yet. In a high-inflation year, the tax bill on TIPS held in a taxable account can significantly exceed the cash interest coupon you actually received. Holding TIPS inside a tax-deferred account like a traditional IRA or 401(k) eliminates this problem by deferring tax until withdrawal.
Can I defer income on Series I or Series EE savings bonds?
Yes. Unlike corporate or Treasury bonds, savings bonds allow you to defer reporting interest income until the bond matures, is redeemed, or reaches final maturity — whichever comes first. You can alternatively elect to report the interest annually, which is rarely advantageous unless you're in a low bracket currently and expect higher rates later. An additional deferral benefit applies to education expenses: if you cash in Series EE or I bonds issued after 1989 and use the proceeds to pay qualified higher education expenses, the interest may be partially or fully excluded from income under the education exclusion — subject to income phase-outs.
Sources and Methodology
This guide describes the general federal income tax treatment of bond and fixed-income investments based on publicly available IRS guidance and regulatory material as of mid-2026. Key sources include:
- Internal Revenue Service (IRS): IRS Publication 550 (Investment Income and Expenses), Publication 1212 (Guide to Original Issue Discount Instruments), and Form 1099-INT and 1099-OID instructions document the interest income, OID, market discount, premium amortization, and savings bond rules described in this guide.
- TreasuryDirect.gov: Treasury's own published materials on TIPS tax treatment, Series I and EE savings bond deferral, and the Education Savings Bond Program are the basis for those sections of this guide.
- Municipal Securities Rulemaking Board (MSRB): MSRB's investor education resources and IRS Notice 2013-80 (alternative minimum tax) inform the municipal bond and private-activity bond sections.
This content was reviewed by the Swoopr Editorial Team in August 2026 and reflects publicly available information at that time. Tax law can change; verify current rules, rates, and phase-out thresholds with the IRS or a qualified tax adviser before making specific decisions based on this guide.
Conclusion
Bond taxation is far more layered than the simple "interest equals income" picture most investors start with. Treasury bonds save you state and local tax but not federal. Municipal bonds skip federal tax for most investors but carry AMT risk on private-activity issues, and their capital gains are taxable like everyone else's. OID and TIPS inflation adjustments both create phantom income — a tax bill in the current year on money you haven't received. Market discount reclassifies what could have been capital gains into ordinary income. Premium amortization turns future capital losses into current deductions, which usually wins. Selling before maturity splits the proceeds into ordinary-income accrued interest and a capital gain on the principal. Savings bonds offer genuine deferral and a targeted education exclusion. None of these rules are punitive when you understand them in advance; they become costly only when they arrive as surprises. Understanding your bond portfolio's tax profile before year-end — not after — is what separates fixed-income investors who plan from those who react.
Related Reading
- Stock & Investment Taxes — the parent hub for this content group, covering capital gains, dividends, wash sales, and other investment tax topics.
- Crypto Tax Records — how cost-basis tracking, disposal rules, and phantom income work in the cryptocurrency context.
- Brokerage and Trading Rules — the sibling hub covering regulatory and operational rules that govern how your trades are executed and settled.