Yes. For U.S. federal tax purposes, a realized capital loss from stock sold in a taxable account can generally offset capital gains, including mutual fund capital gain distributions. But a market decline alone is not a deductible loss: you must sell or otherwise dispose of the investment, and a wash sale can disallow the loss. Mutual fund capital gain distributions are treated as long-term gains even if you have owned the fund for only a short time.
How stock losses and mutual fund gains are netted
The tax calculation groups transactions by holding period. Short-term gains and losses are netted against one another, and long-term gains and losses are netted separately. The resulting short-term and long-term amounts are then combined to determine your net capital gain or loss. Mutual fund capital gain distributions count as long-term capital gains in this calculation. The IRS explains that a distribution is long-term regardless of how long you have owned the fund shares (IRS guidance on mutual fund distributions; IRS Publication 550 (2025)).
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A stock loss can therefore reduce net capital gains that include a mutual fund distribution. The result depends on all your gains, losses, basis, holding periods, and any applicable adjustments; it is not a one-for-one rule that makes every loss deductible against every distribution.
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A mutual fund may sell assets it holds and distribute some of the resulting gains to shareholders. You can receive a capital gain distribution even if you did not sell any of your mutual fund shares. The distribution is generally reported in box 2a of Form 1099-DIV and included in the capital-gain reporting process. Schedule D is usually used, although IRS instructions provide a Form 1040 reporting route for certain taxpayers who do not need to file Schedule D. Check the instructions for the tax year at issue.
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What tax-loss harvesting means
Tax-loss harvesting is selling an investment in a taxable account at a loss so that the realized loss can enter your capital-gain and loss calculation for the year. It changes your holdings, so a possible tax benefit must be weighed against portfolio fit, transaction costs, and the risk of being out of the market or triggering the wash-sale rules. It does not guarantee a tax saving or a better overall investment result.
How to assess a potential loss sale
- Confirm the account type. The rules discussed here concern taxable investment holdings. IRS Publication 550 says its investment rules do not apply to investments held in IRAs, 401(k)s, and other qualified retirement plans.
- Check adjusted basis and holding period. Compare the amount you would receive on disposition with the investment’s adjusted tax basis, accounting for relevant transactions and adjustments. A lower market price by itself does not realize a tax loss.
- Consider the portfolio effect. Decide whether selling changes your investment exposure, diversification, or timing in a way that matters to your plan. Any replacement investment is a portfolio decision, not a tax rule.
- Check the wash-sale window. Review acquisitions of substantially identical securities during the 30 days before and after the loss sale, including relevant purchases in other accounts and those involving a spouse or controlled corporation.
- Keep records and report the transactions. Preserve trade confirmations, basis and lot records, reinvestment records, and relevant tax forms. Report sales and any wash-sale adjustment using the applicable Form 8949 and Schedule D instructions.
Wash sales can disallow a planned loss
Under the IRS wash-sale rule, a loss may be disallowed if you acquire substantially identical stock or securities within 30 days before or after the loss sale. The rule also covers certain exchanges and contracts or options to acquire securities, and it addresses purchases by a spouse or controlled corporation. The IRS includes acquisitions for an individual’s IRA or Roth IRA in its explanation. For IRA-related cases, Publication 550 describes distinct treatment; do not assume the ordinary replacement-share basis adjustment applies.
When a loss is disallowed in an ordinary wash sale, it is generally added to the basis of the replacement securities, postponing recognition of the loss. Whether two particular funds or ETFs are “substantially identical” is not answered by a universal list in the IRS guidance. If the classification is uncertain, consult a qualified tax professional rather than assuming that similar investments are either always identical or always different.
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Mutual fund details that affect basis and holding period
Reinvested dividends and capital gain distributions purchase additional shares. Those shares have their own basis and holding period, which starts the day after purchase. Keep lot-level records so a sale is calculated using the correct shares and dates.
Publication 550 (2025) also describes special treatment for a mutual fund or REIT share held six months or less and sold at a loss. After the specified reduction for exempt-interest dividends, the loss is treated as long-term up to capital gain distributions and the shareholder’s share of undistributed capital gains; any remaining loss is treated as short-term. Because this rule depends on the fund, holding period, and distribution details, use the publication and your tax records to determine the treatment.
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- Form 1099-DIV: Box 2a generally reports capital gain distributions.
- Form 8949 and Schedule D: Sales and other dispositions may need to be reported here, including applicable wash-sale adjustments. Follow the current form instructions.
- Supporting records: Keep tax forms, purchase and sale confirmations, adjusted-basis calculations, reinvestment details, and records of relevant purchases in other accounts.
The governing IRS references are Publication 550 (2025), Investment Income and Expenses and the IRS page on mutual fund capital gain distributions. Tax forms and instructions can change by year, so use the materials for the year you are filing.
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