An investment loss tax deduction lets you subtract losses from selling stocks, bonds, funds, or other investment property against your capital gains without limit, and then deduct up to $3,000 of any remaining loss against ordinary income each year. Married taxpayers filing separately get half that: $1,500 per spouse. Anything you can’t use in the current year carries forward to future returns until it’s exhausted.1Office of the Law Revision Counsel. 26 U.S.C. 1211 – Limitation on Capital Losses
What Counts as a Deductible Loss
The deduction applies to capital assets, which the tax code defines broadly to include stocks, bonds, mutual funds, ETFs, and real estate held for investment. Business inventory, depreciable business equipment, and certain creative works you produced are excluded.2Office of the Law Revision Counsel. 26 U.S. Code 1221 – Capital Asset Defined
Two conditions have to be met. First, the loss must be realized. Watching a stock fall 40% in your account does nothing for your taxes until you actually sell. Second, the asset must have been held for profit rather than personal use. A loss on selling your car or furniture doesn’t qualify, even though those items are technically capital assets.
How Gains and Losses Get Netted
Losses don’t just pile into one bucket at year-end. The IRS requires a specific netting sequence based on holding period. Anything you held for one year or less produces short-term gains or losses; anything held longer produces long-term ones.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses
You first combine all short-term transactions to reach a net short-term figure, then do the same for long-term. If both categories produce the same type of result, you report each on its own. If they produce opposite results, they offset each other, leaving you with a single net capital gain or a single net capital loss for the year.4Internal Revenue Service. Instructions for Schedule D (Form 1040)
The distinction between short- and long-term matters because gains in each category are taxed differently. Short-term gains are taxed at your regular income rate, up to 37%. Long-term gains get preferential rates of 0%, 15%, or 20% depending on income. A short-term loss offsetting short-term gain therefore saves you more per dollar than the same loss offsetting a long-term gain.
The $3,000 Annual Limit on Ordinary Income Offsets
There is no cap on using losses to offset gains. If you have $200,000 in capital losses and $195,000 in capital gains, the losses wipe out every dollar of gain. The limit only applies once your net loss exceeds your gains. At that point, federal law caps the deduction against wages, salary, and other ordinary income at $3,000 per year, or $1,500 for married taxpayers filing separately.1Office of the Law Revision Counsel. 26 U.S.C. 1211 – Limitation on Capital Losses
That $3,000 figure hasn’t changed in decades and isn’t indexed for inflation. The deduction lands on line 7a of Form 1040 and directly reduces your adjusted gross income, which can also affect your eligibility for other income-based credits and deductions throughout the return.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Carrying Losses Forward to Future Years
Losses that exceed the annual limit aren’t lost. They carry forward automatically to the next year and keep their character: short-term losses stay short-term, long-term losses stay long-term.5Office of the Law Revision Counsel. 26 U.S.C. 1212 – Capital Loss Carrybacks and Carryovers In the next year, the carryover enters the netting process again, first offsetting new gains and then contributing to the $3,000 ordinary income deduction.
There is no time limit. A $60,000 net loss with no future gains would take 20 years to deduct in full at $3,000 per year. Tedious, but it doesn’t expire.
One critical exception: carryovers die with the taxpayer. Unused losses can appear only on the decedent’s final income tax return, subject to the same $3,000 cap. The estate cannot inherit remaining carryover, and it cannot pass to heirs or to a surviving spouse’s future returns.6Internal Revenue Service. Decedent Tax Guide
The carryover amount isn’t simply “total loss minus $3,000.” The IRS provides a Capital Loss Carryover Worksheet in the Schedule D instructions that accounts for the deduction you already claimed.7Internal Revenue Service. Instructions for Schedule D (Form 1040)
The Wash Sale Rule
You can’t sell an investment at a loss, claim the deduction, and immediately buy the same thing back. The wash sale rule disallows the deduction if you purchase a substantially identical security within 30 days before or 30 days after the sale, a 61-day window in total.8Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities The rule also applies when you acquire the replacement through an option or contract rather than an outright purchase.
The loss isn’t permanently gone. The disallowed amount is added to the cost basis of the replacement shares. If you bought stock for $10,000, sold for $7,000, and triggered a wash sale by repurchasing, your basis in the new shares becomes $13,000. You’ll benefit from the loss when you eventually sell the replacement shares, assuming you stay clear of another wash sale that time.
Automatic dividend reinvestment can quietly cause the same problem. If your brokerage reinvests dividends into additional shares of the same stock within 30 days of a loss sale, the IRS may treat that reinvestment as a wash sale purchase and disallow a portion of the loss.
Worthless Securities
Sometimes an investment doesn’t just fall. A company goes bankrupt and the stock goes to zero. You don’t need to find a buyer to claim the loss. Federal law treats a worthless security as though it were sold on the last day of the tax year in which it became worthless.9Office of the Law Revision Counsel. 26 U.S.C. 165 – Losses
That deemed sale date on December 31 affects short- versus long-term classification. A stock bought in March and rendered worthless in October produces a short-term loss because the deemed sale is less than a year after purchase. A stock held for several years produces a long-term loss.
The burden of proof is on you. The IRS can challenge the deduction if you can’t show the security had no liquidating value and no reasonable expectation of future value. Pinpointing the correct year is often the hardest part. If the stock actually became worthless two years ago, the deduction belongs on an amended return for that year, not on your current return. You generally have seven years, rather than the standard three, to file a refund claim tied to worthless securities.
Small Business Stock: An Exception to the $3,000 Cap
If you invested directly in a qualifying small business and the stock later becomes worthless or is sold at a loss, part of that loss may be treated as ordinary rather than capital. Ordinary losses skip the $3,000 cap entirely and offset regular income dollar for dollar.
The annual limit under this provision is $50,000 for single filers and $100,000 for joint filers.10Office of the Law Revision Counsel. 26 U.S.C. 1244 – Losses on Small Business Stock Anything above those amounts reverts to capital loss treatment and follows the normal rules. To qualify, the corporation must have received no more than $1 million in total capital contributions (including paid-in surplus) when the stock was issued, and you must be the original purchaser. Stock bought on the secondary market doesn’t count.
Many founders and early investors hold qualifying stock without realizing it. If the venture fails, the gap between a $50,000 ordinary deduction and $3,000 a year of capital loss is significant.
How to Report the Deduction
Three forms feed into each other. Your brokerage sends Form 1099-B by mid-February, reporting proceeds, acquisition and sale dates, and in most cases your cost basis.11Internal Revenue Service. Instructions for Form 1099-B Starting in 2026, cryptocurrency exchanges and other digital asset brokers are required to issue Form 1099-DA for digital asset transactions.12Internal Revenue Service. About Form 1099-DA, Digital Asset Proceeds From Broker Transactions Review these carefully. Brokers sometimes report the wrong basis, especially for shares from corporate actions, reinvested dividends, or transfers from another firm.
Each sale then gets listed on Form 8949. Part I covers short-term transactions and Part II covers long-term.13Internal Revenue Service. IRS Form 8949 – Sales and Other Dispositions of Capital Assets If there’s a wash sale, you enter code “W” in column (f) and the disallowed loss as a positive number in column (g), which reduces the loss you can claim.14Internal Revenue Service. Instructions for Form 8949
Totals from Form 8949 flow onto Schedule D, where short- and long-term results are calculated separately, then netted.15Internal Revenue Service. Schedule D (Form 1040) – Capital Gains and Losses Short-term carryovers from a prior year go on line 6, long-term carryovers on line 14. The final figure transfers to your Form 1040. Most tax software handles all three forms once you import the 1099 data and flag any wash sales or basis corrections. Paper filers must attach both Form 8949 and Schedule D.
The 3.8% Net Investment Income Tax
High-income taxpayers face an additional 3.8% tax on net investment income, which includes capital gains, dividends, interest, and rental income. It applies to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately).16Internal Revenue Service. Net Investment Income Tax
Capital losses reduce your net investment income, which can shrink or eliminate this surtax. If you’re above those thresholds, a loss can save you not just your marginal income tax rate but an additional 3.8% on the portion that offsets net investment income.