A realized loss is what you get when you actually sell an asset for less than its adjusted basis. Until you sell, a decline in value is just paper, and the IRS ignores it. Once the sale settles, the loss is real, and that is where realized losses and how they are taxed starts to matter: investment losses offset your capital gains first, then up to $3,000 of ordinary income per year ($1,500 if married filing separately), and anything left over carries forward to future tax years with no expiration.
When a Loss Becomes Realized
The line between a paper loss and a tax-deductible one is the sale itself. Buy stock for $10,000, watch it fall to $6,000, and keep holding: you have a $4,000 unrealized loss that does nothing on your return. You cannot deduct it, and you do not report it.
The loss becomes realized on the settlement date of the sale. At that moment you compare your net proceeds to the asset’s adjusted basis. Basis starts as what you paid, including commissions and fees. It gets adjusted up for things like capital improvements on real estate, and down for items like depreciation. If proceeds fall below adjusted basis, the gap is your realized loss.
How the Deduction Works for Investment Losses
Realized losses on stocks, bonds, mutual funds, and investment real estate are capital losses. You report each sale on Form 8949 and summarize on Schedule D.1Internal Revenue Service. Instructions for Form 8949 (2025) You cannot simply add up losses and claim the total. The IRS runs them through a specific netting process first.
The Netting Order
Short-term losses (assets held one year or less) are netted against short-term gains. Long-term losses (held more than one year) are netted against long-term gains. The two subtotals are then netted against each other to produce a single net capital gain or net capital loss for the year.2Internal Revenue Service. Instructions for Schedule D (Form 1040)
The ordering matters. Short-term gains are taxed at ordinary income rates, while long-term gains get preferential rates, so wiping out short-term gains with short-term losses is usually the better outcome. The sequence handles that automatically.
The $3,000 Annual Cap
If you end up with a net capital loss, you can deduct up to $3,000 against ordinary income such as wages and interest. The cap drops to $1,500 for married-filing-separately returns.3Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses That $3,000 figure has been the same since 1978 and is not indexed for inflation, so it is unchanged for 2026.
The Carryover
Anything over the $3,000 cap carries forward to the next tax year, keeping its character as short-term or long-term. In that next year, the carryover first offsets any capital gains, then up to $3,000 can again be deducted against ordinary income.4Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers The cycle repeats every year until the loss is used up. For individuals there is no expiration date.
You are responsible for tracking your carryover balance. The Capital Loss Carryover Worksheet in the Schedule D instructions walks through the math, but the IRS does not track it for you. Lose that number and reconstructing it years later during an audit is painful.
Realized Losses That Give You Nothing
Not every realized loss produces a tax benefit. Two situations catch people most often.
Personal-Use Property
Losses on personal-use property are not deductible. Selling your home at a loss, your car for less than you paid, or furniture and collectibles below cost gets you nothing on your return.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses The tax code limits individual loss deductions to assets used in a trade or business, or assets held in a transaction entered into for profit.6Office of the Law Revision Counsel. 26 USC 165 – Losses A personal residence and everyday belongings do not qualify.
The asymmetry hurts. Sell a personal asset at a gain and the gain is taxable; sell at a loss and you get nothing. Financial planners sometimes suggest converting a personal residence to a rental before selling at a loss, but the conversion rules are strict and the basis gets frozen at the lower of cost or fair market value on the conversion date.
Sales to Related Parties
Sell at a loss to a family member, a trust connected to you, or a business entity you control, and the IRS disallows the entire loss. Prohibited relationships are broad: siblings, spouses, ancestors, lineal descendants, and a long list of entity relationships where common ownership exceeds 50%.7Office of the Law Revision Counsel. 26 USC 267 – Losses, Expenses, and Interest With Respect to Transactions Between Related Taxpayers The buyer can later use the disallowed loss to reduce any gain when they sell the asset to an unrelated party, but that is their benefit, not yours.
The Wash Sale Rule
The wash sale rule disallows a loss on a security if you buy a substantially identical replacement within a 61-day window: the 30 days before the sale, the sale date, and the 30 days after. The disallowed loss is added to the basis of the replacement security, so the tax benefit is postponed, not destroyed.8Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
In practice: sell stock for a $1,000 loss, repurchase the next day for $5,000, and your adjusted basis in the replacement becomes $6,000. When you eventually sell those shares, the higher basis means a smaller gain or a larger deductible loss.
“Substantially identical” generally means the same stock or bond. A different company in the same industry, or a similar index fund from a different provider, usually does not trigger the rule. The IRS has never drawn a bright line, so the closer two securities are, the more risk you take.
The IRA Trap
One version of the wash sale rule is unusually harsh. If you sell a stock at a loss in a taxable brokerage account and repurchase it inside an IRA or Roth IRA within the 61 days, the loss is disallowed and the IRA’s basis is not increased. The IRS confirmed this in Revenue Ruling 2008-5.9Internal Revenue Service. Revenue Ruling 2008-5 – Loss From Wash Sales of Stock or Securities Because IRAs do not use basis the way taxable accounts do, the deferred-recovery mechanism of a normal wash sale does not exist here. The loss is permanently gone.
Cryptocurrency
The wash sale statute applies to “stock or securities.” The IRS classifies digital assets like cryptocurrency as property, not securities.10Internal Revenue Service. Digital Assets As of 2026, no finalized federal legislation extends the rule to crypto, so selling Bitcoin at a loss and immediately repurchasing it does not currently trigger a wash sale. Congress has proposed closing the gap, and the IRS could challenge aggressive strategies under broader doctrines, but the statutory text does not reach digital assets.
Worthless Securities and Bad Loans
Worthless Securities
When a security loses all value, you can claim a capital loss even without an actual sale. The tax code treats a worthless security as if sold for $0 on the last day of the tax year it became worthless.6Office of the Law Revision Counsel. 26 USC 165 – Losses Whether the loss is short-term or long-term depends on how long you held it through that December 31.
Pinning down the year of worthlessness is the hard part. A stock trading at pennies on some exchange is not worthless yet. You must claim the loss in the year it became worthless, or lose the deduction.
Nonbusiness Bad Debts
Lend money personally and never get repaid, and you have a nonbusiness bad debt. The tax code treats it as a short-term capital loss regardless of how long the debt was outstanding.11Office of the Law Revision Counsel. 26 USC 166 – Bad Debts You report it on Schedule D, and it runs through the same netting and $3,000 rules as other capital losses.
Two catches. The debt must be totally worthless, because there is no partial deduction for personal loans. And the IRS scrutinizes these deductions closely, so expect to need documentation that the money was a genuine loan rather than a gift, that you tried to collect, and that collection is now hopeless.
How You Got the Asset Changes the Math
Gifted Assets: the Dual Basis Rule
When someone gives you an asset that has already lost value (fair market value on the gift date is lower than the donor’s basis), a special rule splits your basis in two. For calculating a loss, your basis is the lower fair market value on the gift date, not the donor’s higher original cost.12eCFR. 26 CFR 1.1015-1 – Basis of Property Acquired by Gift
Example: your parent bought stock for $10,000 and gifted it to you when it was worth $7,000. If you later sell for $5,000, your loss is $2,000, not $5,000. The $3,000 decline before the gift is lost. Sell for $8,500 (between the two basis figures) and you have no gain and no loss. The rule exists to stop built-in losses from being transferred by gift; if the donor wants the loss, the donor has to sell.
Inherited Assets and the Step-Up
Inherited property generally takes a basis equal to fair market value on the date of death.13Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent The familiar “step-up” wipes out untaxed gains, but it also works in reverse. If stock the decedent bought for $20,000 was worth $8,000 at death, your basis is $8,000, and the $12,000 lifetime decline is a loss nobody can claim. This is why advisors sometimes suggest selling losing positions during life rather than passing them on.
Business Losses Follow Different Rules
Realized losses tied to business operations are treated more generously than investment losses.
Losses on inventory and other assets held primarily for sale to customers are ordinary losses, fully deductible against business income with no annual cap. The $3,000 ceiling does not apply.
Depreciable business property held for more than one year (machinery, equipment, vehicles, business real estate) falls under Section 1231.14Office of the Law Revision Counsel. 26 USC 1231 – Property Used in the Trade or Business and Involuntary Conversions These assets get hybrid treatment: losses are ordinary (fully deductible against any income), while gains are long-term capital gains taxed at lower rates. There is a lookback catch. If you claimed net Section 1231 losses in any of the prior five years, current-year Section 1231 gains are recharacterized as ordinary income up to the amount of those unrecaptured losses.
Section 1231 property losses are reported on Form 4797, not Schedule D.15Internal Revenue Service. Instructions for Form 4797
Using Realized Losses on Purpose: Tax-Loss Harvesting
Tax-loss harvesting is the deliberate strategy of selling losing investments to generate realized losses that offset capital gains. You sell the loser, book the loss, and reinvest in a different (but not substantially identical) position to keep market exposure.
The math is straightforward. $10,000 of realized gains plus $10,000 of harvested losses equals a net capital gain of zero. If losses exceed gains, up to $3,000 goes against ordinary income and the rest carries forward.3Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses
The main constraint is the wash sale rule. Wait at least 31 days before buying back the same security, or move the proceeds into something sufficiently different. Many investors swap between similar index funds from different providers to stay invested. Trades must settle by December 31 to count for that tax year.
One honest caveat: harvesting lowers your basis in the replacement investment, which means a larger taxable gain when you eventually sell it. You are deferring tax, not erasing it. A dollar deferred is worth less than a dollar paid today, so the benefit is real, but it is not free money.