IRS Warns Corporations: Capital Losses Can’t Offset Income, Nols Still Capped at 80%

(U.S.) — U.S. corporations in 2026 face sharply different tax treatment depending on whether a loss is a capital loss or a net operating loss, a divide that can determine whether a company gets an immediate tax benefit, carries a deduction into future years, or loses it altogether.

That distinction remains central in current IRS corporate guidance and filing instructions. A corporation generally cannot use a capital loss against ordinary income, while a net operating loss, or NOL, can usually be carried forward, though post-2017 NOL deductions are generally capped at 80% of taxable income in the carryforward year.

The split matters for closely held corporations, startup C corporations, immigrant-founded businesses and companies with uneven earnings. A corporation can post an overall tax loss for the year and still find that part of the loss produces no current tax benefit, especially when the loss comes from capital transactions rather than business operations.

For corporate taxpayers, the basic rule is direct. Capital losses may be used only against capital gains, not ordinary business income.

Current IRS Instructions for Schedule D (Form 1120) say that for a corporation, capital losses are allowed in the current year only to the extent of capital gains. A company that sells stock, land held as a capital asset, or another capital asset at a loss cannot automatically use that loss to reduce income from ordinary operations.

That can leave corporations with a tax result that differs from what owners expect. If a business has no capital gains in the year of the sale, the excess capital loss generally cannot be deducted in the current year, even if the company has a broader economic loss.

The contrast with an NOL is substantial. A net operating loss generally reflects loss from operating the business after tax law requires specific NOL adjustments, and current IRS materials continue to treat post-2017 NOLs as generally eligible for indefinite carryforward.

Even then, the deduction is not unlimited. IRS guidance in Publication 542 and related materials reflects that the NOL deduction is generally limited to 80% of taxable income for losses arising in tax years beginning after December 31, 2017.

That means a company with a large NOL carryforward may still owe tax in a profitable year. The 80% ceiling can leave part of taxable income exposed even when prior-year losses remain available.

By contrast, a capital loss does not become more flexible because a company also has an NOL. IRS rules keep those categories separate, and a capital loss carryover cannot be folded into a broader operating-loss calculation to create a larger deduction against ordinary income.

Corporate capital losses also still follow a carryback-and-carryforward structure that differs from modern NOL rules. The IRS says a net capital loss is generally carried back 3 years and then forward 5 years, and it is treated as a short-term capital loss in the carryback or carryforward year.

That carryback has a firm limit. The IRS says a capital loss can be carried back only to the extent it does not create or increase a net operating loss in the year to which it is carried.

Unused amounts do not disappear immediately. After the carryback period, they can move forward for up to 5 years, but if they remain unused by the end of that period, they expire.

That expiration risk can matter when a corporation records a capital loss during a period with little or no capital-gain activity. A company may assume the loss will eventually reduce tax, yet without enough gains in the carryback or carryforward period, the deduction may sit idle and then vanish.

IRS corporate capital-loss rules also block another common assumption. The Schedule D instructions state that a corporation cannot use a capital loss carried from another year to produce or increase an NOL.

That rule can trip up businesses working from internal financial statements rather than tax calculations. A capital loss carryforward may appear on the books as an available tax attribute, but it can offset capital gains in an eligible year only; it cannot operate as a general loss engine against ordinary income.

The divide between a capital loss and an NOL also affects refund planning. For C corporations seeking a tentative refund from certain carrybacks, Form 1139 remains the IRS form used to claim relief based on a qualifying net capital loss carryback.

Current IRS materials say corporations other than S corporations use Form 1139 for that purpose. The form is filed separately and generally must be filed within 12 months of the end of the tax year in which the loss arose.

That timetable keeps the form relevant, but not for every loss year. Many post-2017 NOLs no longer fit the old general carryback refund model, so filing Form 1139 depends first on whether the specific loss type still carries back under current law.

The rules for NOL carrybacks changed sharply after 2020. IRS Publication 536 states that, generally, NOL carrybacks were eliminated for most NOLs arising in tax years ending after 2020, with limited exceptions such as certain farming losses.

Current corporate guidance aligns with the broader post-TCJA framework. Most corporate NOLs arising after 2017 no longer follow the old general carryback rule, even though they can generally carry forward indefinitely.

Older losses still sit under older law. IRS materials note that NOLs arising in tax years beginning before 2018 remain subject to prior-law rules, including the earlier carryback regime and older carryover limitations.

That can leave a corporation with multiple pools of losses governed by different law. One bucket may involve a post-2017 NOL with indefinite carryforward and an 80% of taxable income cap, while another may involve a pre-2018 NOL that still carries older carryback rights or different carryover limits.

For tax departments and smaller corporate owners alike, that means timing matters as much as classification. A loss incurred in one year may follow one set of rules, while a similar loss incurred later may fall into an entirely different system.

NOL calculations bring another complication. A corporation does not determine an NOL simply by looking at a book loss on its financial statements.

Tax law uses taxable-income concepts and applies special NOL adjustments. IRS publications say those adjustments can include the dividends-received deduction, capital-loss carryovers, charitable-contribution carryovers and other items handled under specialized NOL rules.

As a result, tax results can diverge sharply from accounting results. A corporation may have a steep financial-statement loss and still compute a smaller tax NOL after backing out or modifying deductions and carryovers required under the tax code.

That difference can be material for companies in restructuring, asset sales, startup wind-downs or years with mixed losses from operations and investments. A business may see a book loss, a capital loss and an NOL in the same year, yet each item can follow its own path.

The practical point for corporations is not that losses lack value. It is that losses fall into separate tax buckets, and those buckets do not merge freely.

A capital loss remains confined to capital-gain offset rules. An NOL remains tied to taxable income and its own deduction limits. One does not automatically become the other.

That separation matters in planning future deductions. A corporation with a large NOL carryforward cannot assume a capital loss carryforward will enlarge that NOL, just as a corporation selling an investment asset at a loss cannot assume it receives the same tax benefit as it would from an operating loss generated by the business itself.

For many smaller and founder-led corporations, the misunderstanding starts with a simple phrase: “A loss is a loss.” Federal corporate tax law does not treat losses that way.

A capital loss may sit unused without capital gains. An operating loss may survive for years but still face the 80% of taxable income cap when used later. Older losses may also remain subject to different legal rules than newer ones, creating parallel categories inside the same corporation.

That makes classification especially important for companies with irregular earnings. A founder-led corporation may see an apparent opportunity to reduce current or future tax after selling an investment asset at a loss, but the tax benefit may depend entirely on whether the loss is capital, operating, current-year or governed by prior law.

The same caution applies to refund expectations. Form 1139 still matters, but chiefly in situations where a qualifying carryback exists, such as a net capital loss carryback or certain NOL carrybacks still allowed under current law.

For 2026, the IRS framework remains consistent on the broad points. Corporate capital losses offset capital gains only, not ordinary income, and a net capital loss is generally carried back 3 years and forward 5 years as a short-term capital loss.

Corporate NOLs generally follow the post-2017 system of indefinite carryforward in many cases, but their deduction is generally limited to 80% of taxable income for applicable loss years. Older pre-2018 NOLs may still follow older carryback and carryover rules.

For corporations measuring the tax effect of a bad year, that leaves a simple bottom line. Before counting on any deduction, a company must determine whether it is dealing with a capital loss, a net operating loss, or a carryover from an earlier legal regime, because one mistaken assumption about capital loss treatment or an NOL can turn an expected tax break into none at all.