Her $60,000 Capital Loss Carryover Won’t Fully Survive Her Death: Only What’s Used on the Final Joint Return Remains

Many surviving spouses assume a deceased spouse’s unused capital losses automatically carry forward, but tax rules can erase a large chunk of that deduction unless the losses are used on the final return filed for the year of death.

A widow or widower reviewing a prior year tax return may find a capital loss carryover worksheet showing $60,000 in losses that had been set aside to offset future gains. It is natural to think that balance simply becomes the survivor’s.

Federal tax law works differently. The deceased spouse’s unused losses can be claimed on the final income tax return for the year of death, and that return may be filed jointly with the surviving spouse. After that final return, any remaining amount tied to the deceased spouse disappears.

How Capital Loss Carryovers Work During Life

A capital loss occurs when an investment is sold for less than its cost. Those losses first offset capital gains, which are the profits from selling investments. If losses are still left over, they can reduce ordinary income such as wages or pension income by up to $3,000 a year, or $1,500 for a married person filing separately, under 26 U.S.C. § 1211(b).

Any amount above that carries into the next tax year under 26 U.S.C. § 1212(b)(1), and the carryover continues as long as the taxpayer who generated the loss remains alive. This discussion focuses on what happens when that taxpayer dies.

What the IRS Says Happens at Death

IRS Publication 544 is explicit: “Capital losses cannot be carried over after a taxpayer’s death. They are deductible only on the final income tax return filed on the decedent’s behalf.” The same guidance says the yearly limit still applies, and the estate cannot claim the remainder or continue the carryover. A recent CPA Journal column traces that rule to Revenue Ruling 74-175, which limits the deduction to the individual’s final return and allows the estate none of it.

The loss does not vanish entirely if it was used on the final joint return. On a joint filing, Publication 544 treats the spouses’ gains and losses as though they were one taxpayer. Once the surviving spouse files alone, only the spouse who actually generated the loss may continue to use the carryover. Treasury regulation 26 CFR 1.1212-1 allocates carryovers between spouses based on each spouse’s own net losses in the year the losses were created. If part of the $60,000 came from the survivor’s own accounts, that portion remains available.

Who Is Most Affected

This rule matters when a surviving spouse’s late husband or wife had an unused capital loss carryover. If the survivor files a joint return for the year of death, the full carryover can still be used in that year, including against income earned after the spouse died, according to a 2017 Tax Adviser column.

If the carryover came entirely from the surviving spouse’s own losses, it continues under the usual rules. Couples with no carryover have nothing to worry about here.

How to Use the Losses Before They Disappear

1. Identify which losses belong to the deceased spouse by tracing them back to the year and account that created them.
2. Review basis step-up rules. Under 26 U.S.C. § 1014(a)(1), property inherited from a decedent generally gets a new tax basis equal to fair market value at death. In common-law states, only half of jointly owned property held as joint tenants with right of survivorship or tenants by the entirety is included in the deceased spouse’s estate under § 2040(b), so only that half gets a step-up under § 1014(b)(9). Community property states work differently: § 1014(b)(6) can also step up the survivor’s half, as discussed in a recent California example. Because the deceased spouse’s appreciated assets may already have had their gains eliminated, the survivor often needs to look to his or her own assets for additional gains to harvest.
3. Realize gains in the year of death. Any gains recognized in that year, whether from the survivor’s own assets or from joint assets, can be offset by the deceased spouse’s losses on the final joint return. A CPA Journal column notes that a survivor may sell and then potentially repurchase positions, which can raise the basis of the shares bought back.
4. Compare the outcomes. If all $60,000 belongs to the deceased spouse and no gains are realized, about $3,000 offsets ordinary income and $57,000 expires. If the survivor realizes $40,000 of gains, then $43,000 of the carryover is used and $17,000 expires. If gains total $57,000, plus the ordinary-income deduction, the full carryover is used.

Why Timing Matters So Much

All of this must happen in the calendar year of death. A death early in the year leaves more time to plan sales. A late-year death leaves only a narrow window. Gains realized in the following year go onto a return where the deceased spouse’s losses are no longer available and are taxed under the normal rules. This is one of several IRS provisions that can quietly erase six figures from retirement savings, and other examples were covered in a separate tax-trap guide.

The surviving spouse should speak with a tax preparer before the end of the year in which the death occurred. A preparer can determine how much of the carryover belonged to the deceased spouse, which assets received a new basis, and how much gain would need to be realized before the losses expire.