A married couple filing jointly can deduct up to $3,000 of net capital losses against ordinary income each tax year, with any unused loss carrying forward indefinitely to future returns. Filing separately cuts that ceiling in half, to $1,500 per spouse, and the joint $3,000 is a single household limit, not a per-spouse figure that doubles because two people are on the return.1Office of the Law Revision Counsel. 26 U.S. Code 1211 – Limitation on Capital Losses
Ordinary income here means wages, interest, rental income, and anything else that isn’t a capital gain. If your net loss for the year is less than $3,000, you deduct all of it and carry nothing forward. The cap only bites when losses exceed that threshold.
Joint Filing Usually Beats Separate When Losses Are Involved
When one spouse has significant capital losses and the other has little investment activity, a joint return preserves the full $3,000 deduction without forcing you to split losses between two returns. Filing separately would drop each spouse to $1,500 and lock each person’s losses to their own return. There’s no way to shift a loss from one separately filed return to the other.
Calculating the Net Loss on a Joint Return
Both spouses’ transactions go into a single calculation. The netting runs in two stages.
First, separate every sale into short-term (held one year or less) and long-term (held more than one year).2Office of the Law Revision Counsel. 26 U.S. Code 1222 – Other Terms Relating to Capital Gains and Losses Net short-term gains against short-term losses to produce one figure. Do the same for long-term. Keeping the categories apart matters because short-term gains are taxed at ordinary rates while long-term gains get preferential rates.
Then combine the two net figures. A positive result is a net capital gain; a negative result is a net capital loss eligible for the deduction. Say a couple has a $7,000 net short-term loss and a $4,000 net long-term gain: the combined figure is a $3,000 net loss, which exactly matches the annual deduction limit.
The Wash Sale Trap Between Spouses
If you sell a security at a loss and buy the same or a substantially identical security within 30 days before or after the sale, the IRS disallows the loss.3Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities The 30-day window runs both directions, creating a 61-day danger zone around every loss sale. The rule also crosses tax years: a December 20 loss followed by a January 10 repurchase is still a wash sale.
Joint filers face a version of this rule that catches people off guard. If one spouse sells a stock at a loss and the other spouse buys the same stock inside the 30-day window, the IRS has taken the position that the wash sale rule applies. Couples with separate brokerage accounts sometimes trigger it without realizing.
The disallowed loss isn’t destroyed. It’s added to the cost basis of the replacement security, so the tax benefit surfaces when that replacement is eventually sold. But the timing shift can wreck a plan that relied on the loss showing up in the current year.
Carrying Losses Forward to Future Years
Any net capital loss above $3,000 rolls into the next tax year. There’s no expiration date; you can keep carrying losses forward for as long as it takes to use them. A joint return with a $15,000 net loss in 2026 deducts $3,000 that year and carries $12,000 into 2027.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Carryovers keep their original character. Short-term stays short-term; long-term stays long-term.5Office of the Law Revision Counsel. 26 U.S. Code 1212 – Capital Loss Carrybacks and Carryovers In the following year, carried-forward losses first offset gains of the same type before any remainder applies against the $3,000 ordinary-income deduction.
When you have both short-term and long-term carryovers, the IRS requires the short-term losses to be used first against the $3,000 cap. Any room left is filled by the long-term component.6Internal Revenue Service. Publication 550 – Investment Income and Expenses The ordering favors you, because short-term losses offset income that would otherwise be taxed at higher ordinary rates.
Track your balance every year using the Capital Loss Carryover Worksheet in Publication 550 or the Schedule D instructions. You don’t file the worksheet, but if you lose track of the balance or mislabel the short- versus long-term portions, the deduction can be undercounted or trigger an IRS mismatch later.
What Happens on Divorce or a Spouse’s Death
Divorce or Switching to Separate Returns
Unused carryovers don’t split evenly between spouses. Treasury Regulations allocate the balance based on each spouse’s individual net capital loss in the year the loss originally arose. If one spouse’s investment activity produced 80% of the net loss that year, that spouse takes 80% of the remaining carryover onto their separate return going forward. The per-return limit also drops to $1,500 once you’re no longer filing jointly.1Office of the Law Revision Counsel. 26 U.S. Code 1211 – Limitation on Capital Losses
Death of a Spouse
Capital loss carryovers do not transfer to a surviving spouse. The IRS allows a decedent’s carryovers only on the decedent’s final income tax return.7Internal Revenue Service. Publication 559 – Survivors, Executors, and Administrators If the couple files jointly for the year of death, any portion of the carryover belonging to the deceased spouse can be used on that final joint return. Anything not absorbed that year is permanently lost.
Attribution depends on who owned the underlying assets. Losses from assets the deceased spouse owned individually belong entirely to the decedent and expire with the final return if unused. Losses from jointly owned assets are split roughly in half, so the surviving spouse keeps their portion and continues carrying it forward on future returns. Ownership records from the years the losses were generated determine the split, which is a reason to keep those records intact.
The Section 1244 Exception for Small Business Stock
One provision lets joint filers bypass the $3,000 cap entirely for a specific kind of loss. Under Section 1244, losses on stock in a domestic corporation that had no more than $1 million in paid-in capital when the stock was issued can be treated as ordinary losses. Joint filers can deduct up to $100,000 of these losses per year directly against ordinary income; the ceiling is $50,000 for other filing statuses.8Office of the Law Revision Counsel. 26 U.S. Code 1244 – Losses on Small Business Stock
The corporation must also draw more than half its income from active business operations rather than passive sources like dividends or royalties. If your stock qualifies, ordinary loss treatment beats running the loss through the $3,000 carryover system for years. Many investors default to reporting these as capital losses without checking whether Section 1244 applies.
Reporting Capital Losses on a Joint Return
Three forms feed into each other. Form 8949 lists every individual sale or exchange. Both spouses’ transactions go on the same form, organized by holding period and by whether the broker reported cost basis to the IRS.9Internal Revenue Service. Instructions for Form 8949
Form 8949 totals flow into Schedule D, where the netting happens. Part I handles short-term transactions, Part II handles long-term, and the bottom combines them into a single net figure. If that figure is a loss, Schedule D applies the $3,000 cap and calculates the deductible amount.10Internal Revenue Service. 2025 Schedule D (Form 1040)
The deductible loss then lands on line 7a of Form 1040, reducing adjusted gross income. Any excess above $3,000 is documented on the Capital Loss Carryover Worksheet for use on next year’s return.
Make sure your Form 8949 entries match the 1099-B forms your brokerages issue. The IRS matches broker reports against returns electronically, and mismatches are far easier to prevent than to correct after filing.