A capital loss carryover is the portion of a net capital loss you couldn’t use in the year you took it, saved for future tax years. Under IRC Section 1212(b), once your capital losses exceed your capital gains, you can deduct up to $3,000 of the excess against ordinary income each year ($1,500 if married filing separately), and anything above that limit rolls forward indefinitely to offset future gains and income until it runs out.1Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers The carryover never expires during your lifetime, but the arithmetic behind it trips up a lot of people.
How the Year’s Netting Produces a Carryover
A carryover only exists after the current year has done its own math. Every asset you sold is classified as short-term (held one year or less) or long-term (held more than one year).2Internal Revenue Service. Topic No. 409, Capital Gains and Losses You combine all short-term transactions into one net figure, do the same for long-term, and then combine those two if one is a gain and the other a loss.
You can’t set aside current-year gains and carry losses forward instead. Every dollar of gain absorbs a dollar of loss first. Only what’s left after that netting can become a carryover.
Once the final number is a net loss, Section 1211(b) caps how much you can deduct against wages, interest, and other ordinary income at $3,000 per year, or $1,500 if you file separately from a spouse.3Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses That deduction runs through Schedule D onto Form 1040 and reduces your adjusted gross income, which in turn can affect eligibility for credits and deductions that phase out at higher income levels.4Internal Revenue Service. Schedule D (Form 1040) – Capital Gains and Losses Whatever exceeds the annual cap is your carryover.
How Your Carryover Amount Is Calculated
The Section 1212(b) computation is not just “net loss minus $3,000.” The statute treats the $3,000 you deducted (or your adjusted taxable income, if lower) as if it were a short-term capital gain, then runs the numbers through the netting process again to figure out how much short-term and how much long-term loss survives into the next year.1Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers
A simplified example. You have a net short-term loss of $8,000 and a net long-term gain of $2,000, for an overall net loss of $6,000. You deduct $3,000 this year. For carryover purposes, that $3,000 is treated as a short-term gain, so your short-term loss is reduced by the $2,000 real long-term gain plus the $3,000 deemed gain. Result: $3,000 of short-term loss carries forward.
A low-income year works differently. If your taxable income (before the capital loss deduction) is less than $3,000, the carryover is calculated using only the amount that actually reduced your tax. Someone with $1,500 of taxable income and a $10,000 capital loss deducts $1,500 (not $3,000), and the carryover is $8,500. The IRS Capital Loss Carryover Worksheet walks through the steps.5Internal Revenue Service. Publication 550 – Investment Income and Expenses
Short-Term and Long-Term Character Survives
Losses keep their character when they roll forward. Under Section 1212(b)(1), the short-term portion of your net loss carries forward as short-term, and the long-term portion carries forward as long-term.1Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers That distinction affects your tax bill. Short-term gains are taxed at ordinary rates, so a short-term carryover that offsets a short-term gain saves tax at your marginal rate. Long-term gains are taxed at capital gains rates, so a long-term carryover saves less per dollar when it offsets a long-term gain.
Each new year, your carryovers slot into the netting process alongside fresh transactions. Short-term carryovers combine with current-year short-term results; long-term carryovers combine with current-year long-term results. If one category is a net loss and the other a net gain after that combination, they offset each other as usual. The worksheet redoes the character split every year.
Using the Carryover in Later Years
Reporting starts with Form 8949, where every transaction is listed individually. Totals flow to Schedule D of Form 1040, which is where the netting happens and where you enter your prior-year carryover on the lines designated for short-term and long-term carryover amounts.6Internal Revenue Service. Instructions for Form 89494Internal Revenue Service. Schedule D (Form 1040) – Capital Gains and Losses Those amounts come from the Capital Loss Carryover Worksheet, which appears in both the Schedule D instructions and IRS Publication 550.5Internal Revenue Service. Publication 550 – Investment Income and Expenses
The worksheet pulls several numbers from last year’s return: the net loss from Schedule D, taxable income from Form 1040, and the short-term/long-term breakdown. It runs the statutory computation and outputs the two carryover amounts.
Keep every prior year’s Schedule D and completed worksheet. A large carryover can span decades, and the IRS won’t reconstruct the history for you. If you change tax software or preparers, those records are the only link between years, and an inconsistency between what you claim and what your prior returns show is exactly the kind of thing that draws a notice.
The Wash Sale Rule Can Block a Loss From Ever Carrying Forward
A wash sale is the most common way a loss gets stripped out before it can even reach the carryover. If you sell a stock or security at a loss and buy a substantially identical one within 30 days before or after the sale, the loss is disallowed for that year.7Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities It isn’t lost forever. It gets added to the cost basis of the replacement shares, but it doesn’t show up as a realized loss you can use for carryover purposes until you eventually sell those replacement shares without triggering another wash sale.
The 30-day window runs both directions, which catches people who buy first and sell later. Buy shares on March 1, then sell older shares of the same stock at a loss on March 20, and the earlier purchase disqualifies the loss. The rule applies to stocks, bonds, options, and contracts to acquire securities. It does not currently apply to cryptocurrency or most other non-security assets, though this could change.8Internal Revenue Service. Wash Sales
A disallowed wash sale loss never enters the carryover calculation at all. If you’re harvesting losses at year-end to build or add to a carryover, stay out of the 30-day repurchase window for anything substantially identical to what you sold.
Skipped Years, Divorce, and Death
The carryover computation assumes you used the $3,000 deduction whether or not you actually filed. If you skip a year with wage income, you lose that year’s $3,000, and the carryover into the next year drops by the same amount. If you had no income, the adjusted taxable income rule limits the deemed deduction to your actual income, which can be zero. Filing every year protects the deduction and the paper trail.
When a couple that filed jointly divorces and begins filing separately, the carryover from the joint return belongs to whichever spouse incurred the loss, not automatically split down the middle.5Internal Revenue Service. Publication 550 – Investment Income and Expenses For assets held in joint accounts, that means tracing which spouse owned what, using brokerage records and the allocation rules in the Treasury Regulations.
When a taxpayer dies, any unused carryover dies too. It’s personal to the individual who sustained the loss and cannot pass to a surviving spouse, heir, or estate. It can be used on the decedent’s final income tax return, and if the surviving spouse filed jointly for that final year it can offset gains on that joint return. Once the final return is filed, the remaining balance is gone. If both spouses have their own carryovers and one dies, the survivor keeps only their own portion.
No Expiration Date
Capital loss carryovers under Section 1212(b) have no statutory expiration. They roll forward year after year until fully absorbed by gains or the $3,000 annual deduction.1Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers A retiree who stopped investing years ago still gets the annual $3,000 deduction against pension or Social Security income while any balance remains. The only two events that end a carryover are using it up and death.