Capital losses are tax deductible, but not as a straight write-off against everything you earn. First you net your losses against any capital gains for the year. Whatever loss remains after that can offset up to $3,000 of ordinary income like wages or self-employment profit ($1,500 if you’re married filing separately), and anything still left carries forward to future years with no expiration.1Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses The catch is a mandatory netting order, several categories of losses the IRS blocks entirely, and a few timing traps that can wipe out a deduction you thought you had.
Netting Comes Before Deducting
You can’t simply add up your losses and subtract them from your gains. The IRS requires every sale to be sorted into one of four buckets: short-term gains, short-term losses, long-term gains, and long-term losses. An asset held one year or less is short-term; held longer than a year, it’s long-term.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Netting runs in two rounds. Within each holding period, losses cancel gains: short-term losses against short-term gains, long-term against long-term. If one side is a net loss and the other a net gain, the two cross-net against each other. Suppose you finish the year with a $10,000 net short-term gain and a $15,000 net long-term loss. Cross-netting leaves a $5,000 net capital loss, and it keeps its long-term character because that’s where the excess came from. The math happens on Form 8949 and Schedule D.3Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
Only after this whole process do you know whether you have a deductible loss at all. If netting produces an overall gain, it gets taxed. If it produces an overall loss, you move to the deduction cap.
The $3,000 Annual Cap
Whatever net capital loss survives the netting can offset up to $3,000 of ordinary income per year ($1,500 for married filing separately).1Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses That ceiling is hard. It doesn’t matter whether the loss is short-term or long-term, and it doesn’t matter how big the total loss is. Someone with a $200,000 net capital loss deducts the same $3,000 this year as someone with a $4,000 loss.
The cap hasn’t changed since 1978 and isn’t indexed for inflation, so its real value has shrunk over the decades. If your net loss for the year is under $3,000, you just deduct the actual amount and have nothing left over. The deduction reduces total income on Form 1040, which lowers your adjusted gross income and can ripple into other AGI-driven tax items.
Carrying the Rest Forward
Anything above the $3,000 cap carries forward to the next tax year automatically. No election, no separate form. The carryover drops into next year’s Schedule D and re-enters the netting process as if it were a fresh loss.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses It keeps its original character: short-term stays short-term, long-term stays long-term.4Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers In the following year, the carried loss nets against new gains in the same bucket first, then cross-nets, then offsets up to another $3,000 of ordinary income.
There’s no expiration. A large enough loss can carry forward for decades. But the IRS doesn’t track the balance for you, so you need to keep your prior-year Schedule D worksheets and know how much of the carryover is short-term versus long-term. Losing track means leaving the deduction on the table year after year.
Carryovers End at Death
Unused capital loss carryovers can be claimed on the decedent’s final income tax return, but whatever remains after that disappears. It doesn’t pass to the estate or to heirs.5Internal Revenue Service. IRS Publication 559 – Survivors, Executors, and Administrators For couples who filed jointly, only the portion attributable to the surviving spouse continues. If one spouse alone owned the losing investment and generated the carryover, the surviving spouse can’t use what’s left after the year of death.
Losses the IRS Won’t Let You Deduct
Personal-Use Property
Losses on property held for personal use are not deductible. That includes your home, your car, and your furniture. The tax code limits individual loss deductions to property used in a trade or business and property in a transaction entered into for profit.6Office of the Law Revision Counsel. 26 USC 165 – Losses Your primary residence is the most common example of the asymmetry: a loss on sale is nondeductible, while a gain above $250,000 ($500,000 for joint filers) is taxable.7Internal Revenue Service. Topic No. 701, Sale of Your Home
Sales to Related Parties
A loss on a sale to certain family members or connected entities is disallowed. The rule covers siblings, spouse, parents, children, and grandchildren, plus sales between you and a corporation you control (more than 50% ownership), between a grantor and a trust, and several other relationships.8Office of the Law Revision Counsel. 26 USC 267 – Losses, Expenses, and Interest With Respect to Transactions Between Related Taxpayers Constructive ownership rules can pull in stock owned by relatives or business partners when the 50% threshold is being measured. To generate a deductible loss, the buyer has to be genuinely outside these circles.
Wash Sales
Selling a security at a loss and buying it right back is a wash sale, and the loss is disallowed. The window runs 30 days before and 30 days after the sale, so 61 days in total. If you, your spouse, or a corporation you control buys substantially identical stock or securities during that window, the loss doesn’t count.9Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities10Internal Revenue Service. IRS Publication 550 – Investment Income and Expenses
A disallowed wash sale loss isn’t gone forever in the normal case. The amount gets added to the cost basis of the replacement shares, so the loss is effectively deferred until you sell those new shares. Your holding period on the replacement also picks up the time you held the original.
The exception is punishing. If the replacement purchase happens inside your IRA or Roth IRA, the loss is disallowed and the disallowed amount does not get added to the IRA shares’ basis. Because IRAs don’t track share basis the way taxable accounts do, the loss simply vanishes.11Internal Revenue Service. Revenue Ruling 2008-5 It applies even if the IRA is at a different brokerage, and automatic contributions buying the same fund can trigger it without you noticing.
Worthless Securities
You don’t need an actual sale to claim a loss on a security that has gone to zero. The IRS treats worthless securities as sold on the last day of the tax year for zero proceeds.12Internal Revenue Service. Losses – Homes, Stocks, Other Property Because the deemed sale date is December 31, a short-term loss can convert into a long-term one.
The tricky part is timing. You have to claim the loss in the year the security actually became worthless, not the year you realized it. If a stock became worthless in 2024 but you didn’t figure it out until 2026, you need to amend your 2024 return. The IRS allows a seven-year window for amending returns to claim worthless security losses, instead of the usual three. If you later recover money from the security through a settlement or liquidation, that recovery is a capital gain in the year received.
Cryptocurrency and Digital Assets
Crypto, NFTs, and other digital assets are capital assets for tax purposes. Losses on them run through the same netting process, the same $3,000 cap, and the same carryforward rules as stock losses. You have to actually sell or exchange to realize the loss; a drop in market value while you still hold is unrealized.
One meaningful difference: the wash sale rule does not currently apply to digital assets. You can sell a cryptocurrency at a loss and buy it back the same day without disallowance. Legislation has been proposed to close the gap, but as of 2026 no law extends the wash sale rule to digital assets. That could change.
Where It All Gets Reported
Every sale of a capital asset goes on Form 8949 with the description, dates acquired and sold, proceeds, cost basis, and any adjustments such as wash sale disallowances. Short-term and long-term transactions go in separate sections. Totals flow into Schedule D, which handles the netting across the four buckets and produces the net capital gain or loss figure that transfers to your Form 1040.13Internal Revenue Service. Instructions for Form 8949
A capital loss carryover from a prior year enters Schedule D as a carried-forward amount and joins the current year’s netting. Save your prior-year Schedule D worksheets. The IRS won’t remind you of the carryover balance, and tax software only knows about it if you enter it or import last year’s return.