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Selling a bond for less than its tax basis may realize a capital loss, but a fall in market value by itself does not create a deductible loss or guarantee tax savings. For U.S. federal individual income tax, the result depends on the bond’s adjusted basis and tax treatment, the sale or other disposition, other capital gains and losses, and whether wash-sale rules apply.
When a bond loss becomes a tax loss
A bond’s price decline is unrealized until you sell or otherwise dispose of it. To work out the result, compare the transaction proceeds with the bond’s adjusted tax basis, accounting for applicable adjustments and the tax character of the transaction. A loss shown on a brokerage statement is not necessarily the final tax result.
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Bond transactions can involve more than a change in quoted price. Accrued interest, market discount, original issue discount, holding period, and basis adjustments may affect how amounts are computed or characterized. The Internal Revenue Service’s Publication 550 (2025), Investment Income and Expenses discusses market discount bonds and tax-exempt bonds separately; the treatment of a particular bond depends on its terms and transaction.
How tax-loss harvesting works
Tax-loss harvesting is the realization of a loss through a sale or other disposition, followed by applying that loss under the tax rules. It does not create an automatic dollar-for-dollar reduction in tax. Capital losses generally offset capital gains first. If an individual has a net capital loss after that calculation, the amount that may be deducted against other income is generally limited each year, with unused amounts generally carried forward.
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| Federal rule for individuals | Amount or timing | Qualification |
|---|---|---|
| Annual net capital loss deduction against other income | Up to $3,000 | General limit for most individual filers under IRS Publication 550 (2025); this is a deduction limit, not a promised tax saving. |
| Annual net capital loss deduction for married filing separately | Up to $1,500 | IRS Publication 550 (2025). |
| Wash-sale acquisition window | 30 days before or after the loss sale | Applies to acquisition of substantially identical stock or securities under the IRS description; whether two bonds meet that test depends on the specific securities. |
The practical value of a loss depends on your full tax return, including realized gains and losses, taxable income, the bond’s basis and character, and other circumstances. The figures above describe federal rules in the IRS’s 2025 publication, not the amount of tax any particular investor will save.
Check the wash-sale rule before replacing the bond
The IRS describes a wash sale as a loss from a sale or trade of stock or securities when substantially identical securities are acquired within 30 days before or after the loss sale. If the rule applies, the current loss may be disallowed; the IRS publication covers additional acquisition routes and special cases, so a cash sale followed by a purchase is not the only situation to consider.
For bonds, “substantially identical” is not a synonym for “similar.” Do not assume that every replacement bond triggers the rule, or that buying a different bond automatically avoids it. The determination requires attention to the securities and circumstances involved. Review purchases made shortly before the sale as well as planned purchases after it, including relevant transactions that may not appear on one brokerage statement.
Bond-specific treatment matters
Tax-exempt state or local government bonds
The IRS states in Publication 550 (2025): “A loss on the sale or other disposition of a tax-exempt state or local government bond is deductible as a capital loss.” This statement is specifically about a loss on sale or other disposition of such a bond; it does not make the bond’s price decline itself deductible or establish the result for every bond transaction.
Market discount and other bond amounts
Market discount, original issue discount, accrued interest, and basis adjustments can affect a bond’s tax computation or the character of amounts reported. A price loss should not be combined casually with interest income or treated as if every bond follows the same calculation. Consult the bond’s records and the relevant IRS rules for its terms and transaction.
What to review before deciding whether to sell
These checks help frame the decision; they do not substitute for calculating the result on the applicable tax return.
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- Adjusted basis and proceeds: Establish the tax basis and the proceeds for the sale or other disposition, including relevant adjustments.
- Holding period: Determine whether the loss is short-term or long-term.
- Bond features: Identify whether the bond has market discount, original issue discount, or tax-exempt interest, and whether accrued interest or other adjustments matter.
- Other activity for the year: Review realized capital gains and losses that affect how a loss may be used.
- Replacement purchases: Check purchases of the same or potentially substantially identical securities in the 30-day period before and after the sale, and consider applicable special cases.
- Your circumstances: Account and taxpayer circumstances can affect reporting and the outcome; state income-tax treatment is not addressed by the federal guidance discussed here.
How the loss is reported
The IRS directs taxpayers to report capital-asset dispositions on Form 8949 and Schedule D as applicable. Use the forms and instructions for the tax year in which the transaction occurred, and make any adjustments required for the transaction. A broker’s reported basis or loss is useful information, but brokerage reporting does not necessarily resolve every bond-specific tax issue or wash-sale question.
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IRS Publication 550 (2025) is the federal source for the general rules described here. For a transaction involving uncertain bond replacement treatment, market discount, basis adjustments, or other complex facts, a qualified tax professional can assess how those facts apply to your return.
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