Capital losses can be carried back only in narrow circumstances. Individuals generally cannot carry capital losses back to prior tax years under federal law; the losses roll forward instead. C-corporations can carry net capital losses back three years. And one exception lets individuals carry back losses on certain futures and options contracts. Everything below is a variation on those three facts.
Why Individuals Cannot Carry Capital Losses Back
Federal law bars individuals from carrying capital losses back to prior tax years. Under IRC Section 1212(b), a net capital loss rolls forward to the next tax year rather than backward to reclaim taxes already paid.1Office of the Law Revision Counsel. 26 USC 1212 Capital Loss Carrybacks and Carryovers Amending a prior-year return to apply this year’s investment losses against last year’s capital gains is not an option. The losses can only travel forward.
When capital losses exceed capital gains for the year, you can deduct the excess against ordinary income, but only up to $3,000 per year ($1,500 if married filing separately).2Office of the Law Revision Counsel. 26 USC 1211 Limitation on Capital Losses That cap has been $3,000 since 1978 and is not indexed for inflation. A $50,000 loss in a year with no offsetting gains produces a $3,000 current-year deduction and a $47,000 carryover. Against ordinary income alone, exhausting that balance would take more than 15 years, though future capital gains can absorb it faster.
What Happens to the Carryforward
Losses that exceed both your capital gains and the $3,000 ordinary income deduction carry forward automatically to the next tax year. There is no expiration date for individual carryovers; they survive as long as you do.1Office of the Law Revision Counsel. 26 USC 1212 Capital Loss Carrybacks and Carryovers Carried losses keep their original character: short-term stays short-term, long-term stays long-term. In each future year, short-term losses offset short-term gains first and long-term losses offset long-term gains first, with any remaining loss crossing categories before hitting the $3,000 cap.
Two limits on the carryforward are worth knowing. Unused capital losses die with the taxpayer, deductible only on the final income tax return; the estate cannot carry any remainder forward.3Internal Revenue Service. Publication 559 Survivors Executors and Administrators And if spouses who filed jointly later file separately, only the spouse who actually incurred the loss can claim the carryover.4Internal Revenue Service. Instructions for Schedule D Form 1040
The Section 1256 Contract Exception
One scenario lets an individual carry a capital loss backward. Losses on regulated futures contracts, foreign currency contracts, nonequity options, and dealer equity options qualify as Section 1256 contract losses. Under IRC Section 1212(c), you can elect to carry a net Section 1256 contract loss back three tax years.1Office of the Law Revision Counsel. 26 USC 1212 Capital Loss Carrybacks and Carryovers The carryback offsets only gains from other Section 1256 contracts in those prior years, not gains from stock sales or other capital assets.
Section 1256 contracts follow the 60/40 rule: 60% of gains or losses are treated as long-term and 40% as short-term regardless of holding period.5Internal Revenue Service. Gains and Losses From Section 1256 Contracts and Straddles You report these positions on Form 6781, and the carryback election is made on that same form. Most individual investors never touch this rule, but active futures and options traders can use it to generate a refund from an earlier profitable year.
How C-Corporations Carry Capital Losses Back
Corporations get a different regime. A C-corporation with a net capital loss can carry that loss back to the three preceding tax years.1Office of the Law Revision Counsel. 26 USC 1212 Capital Loss Carrybacks and Carryovers The loss goes to the earliest of the three years first and moves forward sequentially through the remaining two. This mechanism recovers tax the corporation already paid on capital gains during more profitable years.
Two restrictions apply. A corporate capital loss carryback can only offset capital gains in the prior years, not ordinary business income. And the carryback cannot create or increase a net operating loss in the year it is applied to.6eCFR. 26 CFR 1.1212-1 Capital Loss Carryovers and Carrybacks If a prior year held $100,000 in capital gains and the corporation is carrying back $150,000, only $100,000 absorbs into that year; the remaining $50,000 moves to the next year in the window.
The carryforward side is less generous than for individuals. Any corporate capital loss not absorbed within the three-year carryback window can carry forward only five taxable years after the loss year, and then it is gone.1Office of the Law Revision Counsel. 26 USC 1212 Capital Loss Carrybacks and Carryovers All carried-back and carried-forward corporate capital losses are treated as short-term regardless of the underlying holding period. The Tax Cuts and Jobs Act of 2017 eliminated the carryback for net operating losses but left this capital loss carryback intact.
Claiming the Refund
The filing form depends on timing. Within 12 months of the end of the loss year, a corporation can use Form 1139, the Corporation Application for Tentative Refund, for expedited processing.7Internal Revenue Service. About Form 1139 Corporation Application for Tentative Refund The income tax return for the loss year must be filed on or before the Form 1139 filing date.8Internal Revenue Service. Instructions for Form 1139
After that 12-month window, the corporation must use Form 1120-X, the Amended U.S. Corporation Income Tax Return.9Internal Revenue Service. Instructions for Form 1120-X Form 1120-X takes longer to process than Form 1139, which is why a corporation expecting a significant refund has a real incentive to file within the first year.
Pass-Through Owners Follow the Individual Rules
S-corporations and partnerships do not pay their own income tax. Capital losses flow through to owners on Schedule K-1, and each owner claims their share on a personal return.10Internal Revenue Service. S Corporation Stock and Debt Basis Once the loss lands on the individual return, the individual rules take over: no carryback, $3,000 ordinary income cap, indefinite carryforward. Owning a business through a pass-through entity does not create a carryback path that the individual rules otherwise prohibit.
An owner can only claim the entity’s capital losses up to adjusted basis in the entity. For an S-corporation shareholder, that is stock and debt basis combined; for a partner, it is outside basis in the partnership.11Internal Revenue Service. New Limits on Partners Shares of Partnership Losses Frequently Asked Questions Losses in excess of basis are suspended, not lost, and become deductible when the owner adds basis through further contributions or allocated income. One trap for S-corporation shareholders: disposing of all your stock while suspended losses remain permanently destroys those losses.10Internal Revenue Service. S Corporation Stock and Debt Basis Check for suspended losses before selling shares, because a basis-increasing transaction beforehand can free them up.