C Corp Loss Carryforward: Section 382, SRLY, and the 80% Cap

A C corporation that loses money in a tax year can use that net operating loss to reduce taxable income in future profitable years. For losses arising in tax years beginning after December 31, 2017, the C corp loss carryforward runs indefinitely, but the deduction in any single future year is capped at 80% of that year’s taxable income. Carrybacks are gone for most corporations. Ownership changes, consolidated filings, and state rules can tighten the picture further.

The Post-TCJA Framework

The Tax Cuts and Jobs Act rewrote the core rules. Before 2018, corporate NOLs carried back two years and forward twenty, with no percentage cap on how much of a future year’s income they could offset. For losses arising in tax years beginning after December 31, 2017, that scheme is replaced by two changes that pull in opposite directions.

First, the twenty-year expiration is gone. A post-2017 loss carries forward until fully absorbed, no matter how many years that takes. Second, the deduction in any carryforward year cannot exceed 80% of the corporation’s taxable income, computed without regard to the NOL deduction itself and without regard to deductions under Sections 199A and 250.¹ A corporation with $1 million of pre-NOL taxable income can offset at most $800,000 with post-2017 losses, leaving $200,000 subject to tax. Whatever isn’t used rolls into the next year.

Carrybacks were also eliminated for most C corporations. The CARES Act temporarily restored a five-year carryback for losses arising in 2018, 2019, and 2020, but that window has closed.² For any NOL arising after 2020, the only direction is forward, with two industry exceptions covered below.

Calculating the Loss That Carries Forward

The NOL isn’t simply the negative number at the bottom of Form 1120. Statutory modifications sit between the taxable loss and the amount eligible for carryforward.¹

The most important modification: no NOL deduction from a prior year can be included in computing the current year’s NOL. Without this rule, losses would compound on themselves across years.¹

Capital losses get separate treatment. A C corporation can only use capital losses to offset capital gains in the same year. Any excess capital loss cannot contribute to the NOL calculation at all.¹

The Dividends Received Deduction creates a wrinkle. The DRD is normally capped based on taxable income, but when computing an NOL the income-based cap is lifted if applying the full DRD would create or increase a loss. In other words, the DRD can push a corporation into NOL territory even when it started with positive taxable income before the adjustment.

Charitable contributions add another layer. A corporation’s charitable deduction is normally limited to 10% of taxable income, computed without the charitable deduction itself, certain capital loss carrybacks, and the DRD. Excess contributions carry forward up to five years. When charitable deductions interact with an NOL carryover, the excess contributions that helped enlarge the NOL carryover get reduced dollar-for-dollar so the same amount isn’t claimed twice.

Once the modifications are applied, the result is the statutory NOL. The corporation claims the deduction on line 29a of Form 1120 in a future year with income to absorb it, and reports the total available carryover on Schedule K, Item 12.³

Ordering Pre-2018 and Post-2017 Losses

Corporations still holding pre-2018 NOLs alongside newer losses follow a specific sequence. Pre-2018 losses are applied first, with no 80% cap. If they fully absorb the year’s income, no post-2017 losses are used that year. If pre-2018 losses only partially absorb income, post-2017 losses can then offset up to 80% of the remaining taxable income.⁴ Within either vintage, earlier-year losses go before later-year losses.

The ordering matters. Pre-2018 losses deliver full dollar-for-dollar relief. Once they’re exhausted, the 80% cap governs everything that follows, and the transition year is often worth planning around.

Farming and Insurance Carrybacks

Two categories still qualify for carryback treatment. A farming loss — the portion of the year’s NOL attributable to a farming business — carries back two years. The farming portion is treated as a separate NOL, applied after the remainder of the year’s loss for ordering purposes. A corporation can elect to waive the carryback and send the farming loss forward instead. That election must be made by the due date, including extensions, for the loss-year return, and it is irrevocable once made.⁵ A parallel election waives carryback of a non-farming NOL under the same timing and irrevocability rules.

Property and casualty insurance companies received their own carryback provisions historically, including a five-year carryback for 2018 through 2020 losses. For current years, insurance company NOLs are generally subject to the same indefinite carryforward and 80% cap as other C corporations, though specialty provisions in the Insurance Code sections can modify the calculation.

Ownership Changes and Section 382

Section 382 exists to stop a profitable company from buying a loss corporation mainly to inherit its NOLs. When an ownership change occurs, the ability to use pre-change losses is capped at an annual dollar amount, often far below the corporation’s actual taxable income.⁶

What Counts as an Ownership Change

An ownership change happens when the aggregate stock ownership of one or more 5-percent shareholders increases by more than 50 percentage points over a rolling three-year testing period.⁶ Each 5-percent shareholder’s current ownership is compared to their lowest ownership at any point during the testing period. Shareholders below 5% are aggregated into “public groups” and treated as single 5-percent shareholders. Ordinary stock transactions, secondary offerings, and redemptions can trigger the threshold when the cumulative shift exceeds 50 points.

The Annual Limitation

Once an ownership change occurs, the maximum amount of pre-change NOLs deductible in any post-change year equals the fair market value of the corporation’s stock immediately before the change, multiplied by the IRS-published long-term tax-exempt rate.⁶ That rate is the highest adjusted federal long-term rate from the three-month window ending with the month of the change. As of February 2026, it is 3.56%.⁷

A loss corporation worth $100 million immediately before the change, at a 3.56% rate, has an annual Section 382 limitation of $3.56 million. That cap applies every post-change year regardless of actual profit. A corporation earning $50 million per year can still only use $3.56 million of pre-change NOLs per year.

If the corporation doesn’t use its full annual limitation in a given year, the unused portion increases the next year’s limitation.⁸ Lean years early in the post-change period don’t waste the cap.

Continuity of Business

The post-change corporation must continue the old loss corporation’s business enterprise for the two-year period beginning on the change date. If it doesn’t, the Section 382 limitation drops to zero and the pre-change NOLs are effectively lost.⁸ Recognized built-in gains and Section 338 election gains can still lift the limitation above zero for a specific year even when the general limitation has been zeroed out.

Section 382 Alongside the 80% Cap

When both Section 382 and the 80% cap apply, the deduction cannot exceed either one. Section 382 is usually the binding constraint because the annual limitation is generally a small fraction of the corporation’s income. In the early post-change years, especially after unused limitations have accumulated, the 80% cap can become the effective ceiling instead.

Consolidated Groups and SRLY

When a corporation with NOLs joins a consolidated filing group, the Separate Return Limitation Year rules restrict how those pre-existing losses offset the group’s income. In general, an NOL that arose while the member filed separately can only offset the group’s consolidated income up to that specific member’s cumulative contribution to group income since joining.⁹ A member with a $50 million pre-consolidation loss that contributes only $5 million of income to the group in a given year can offset only $5 million of group income with that loss.

SRLY overlaps with Section 382 in most acquisition scenarios. Treasury regulations provide that when both apply to the same loss, the Section 382 limitation generally takes precedence and the SRLY calculation isn’t layered on top. Built-in losses at the time a member joins the group are folded into the SRLY framework, treated as hypothetical NOL carryovers for cap purposes.¹⁰

States Don’t Follow the Federal Rules Automatically

Federal NOL rules do not automatically apply to state corporate income tax returns. States set their own carryforward periods, percentage caps, and dollar limits, and the variation is significant. Carryforward periods range from as few as five years to indefinite, with twenty years the most common. Some states with gross receipts taxes offer no NOL deduction at all.

Several states impose tighter restrictions than the federal 80% cap. For 2026, some states limit the NOL deduction to 70% or even 50% of state taxable income, while others impose flat dollar caps regardless of income level. A few states have suspended NOL usage entirely for certain years as a revenue measure. The result is that a corporation showing no federal tax due can still face a material state cash tax obligation, and the effective value of an NOL shifts with where the corporation operates.

Records and Penalties

Indefinite carryforward creates a long record retention obligation. The IRS requires that books and records be kept as long as their contents may become material to the administration of any tax law. For an NOL, that means keeping the loss year’s return, workpapers, and documentation of the deductions that generated the loss for at least three years after the carryforward is fully used or expires.¹¹ For an indefinite-life NOL, that can mean decades.

Getting the number wrong is expensive. Overstating an NOL carryforward reduces taxable income and creates an underpayment. If the underpayment meets the substantial understatement threshold — for a C corporation, the lesser of 10% of the tax required to be shown (or $10,000 if greater) and $10 million — the IRS imposes an accuracy-related penalty of 20% of the underpayment.¹² A gross valuation misstatement doubles that penalty to 40%. Tracking each loss year’s origin, the modifications applied, and the amount absorbed in each carryforward year is the reliable defense.

1
Office of the Law Revision Counsel. 26 USC 172 – Net Operating Loss Deduction
2
Internal Revenue Service. Frequently Asked Questions About Carrybacks of NOLs for Taxpayers Who Have Had Section 965 Inclusions
3
Internal Revenue Service. 2025 Instructions for Form 1120
4
Internal Revenue Service. IRM 4.11.11 Net Operating Loss Cases
5
Office of the Law Revision Counsel. 26 US Code 172 – Net Operating Loss Deduction
6
Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-in Losses Following Ownership Change
7
Internal Revenue Service. Rev. Rul. 2026-3, Section 382 Rates
8
Office of the Law Revision Counsel. 26 US Code 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-in Losses Following Ownership Change
9
GovInfo. 26 CFR 1.1502-21 Net Operating Losses
10
eCFR. 26 CFR 1.1502-15 SRLY Limitation on Built-in Losses
11
Internal Revenue Service. Instructions for Form 172
12
Office of the Law Revision Counsel. 26 US Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments