Excess Business Loss Limitation Under IRC Section 461(l)

The excess business loss limitation caps how much net loss from your pass-through businesses you can use to offset other income like wages, interest, dividends, or capital gains in a single year. For the 2026 tax year, that cap is $256,000 for single filers and heads of household, and $512,000 for married couples filing jointly.¹ Anything above the threshold is disallowed for the current year and becomes a net operating loss you carry forward. The rule sits in IRC Section 461(l) and applies only to non-corporate taxpayers.²

Who Has to Apply the Limitation

Every taxpayer that is not a C corporation is subject to Section 461(l). That covers individuals filing as sole proprietors, partners in partnerships, shareholders in S corporations, and the fiduciaries of trusts and estates.² Partnerships and S corporations do not apply the rule themselves. Each partner or shareholder tests their share of the business income and loss against their own threshold, so two people invested in the same losing venture can end up with very different results depending on their filing status and other income.

Trusts and estates use the single-filer threshold, not the joint figure, and they report on Form 461 attached to Form 1041 rather than Form 1040.³

How to Calculate Your Excess Business Loss

Start by adding up gross income and gains from every trade or business you operate: net receipts on Schedule C, your share of ordinary income from pass-throughs on Schedule E, gains from business property sales on Form 4797, and farm income on Schedule F.³ Wages you earn as someone else’s employee do not count, even though the paycheck may feel like business income. Investment income unrelated to a trade or business also stays out.⁴

Next, total the deductions tied to those business activities: operating expenses, rent, depreciation, employee costs, and similar items. Run the calculation without regard to any net operating loss deduction under Section 172 or the qualified business income deduction under Section 199A.³ Subtract deductions from income, then add the threshold amount. A negative result is your excess business loss.

The threshold applies to all your businesses combined. If you file jointly and your ventures produced a net loss of $700,000 in 2026, $512,000 offsets your other income and the remaining $188,000 becomes an excess business loss. Five businesses that each lost $120,000 create a $600,000 aggregate loss tested against the same single threshold.

Business Capital Gains and Losses

Capital items get special treatment inside this calculation. On the deduction side, capital losses from business asset sales are ignored entirely. On the income side, business capital gains are capped at the lesser of your net capital gain from business assets alone or your overall capital gain net income.⁴ That stops taxpayers from inflating business income with capital gains to absorb bigger losses, and it stops business capital losses from artificially widening the disallowed amount.

Where This Rule Fits in the Ordering of Loss Limitations

Section 461(l) is not the first hurdle a pass-through loss has to clear. The IRS applies three loss-limiting rules in a specific order: the at-risk rules first, then the passive activity loss rules, and finally the excess business loss rules.³ Each filter shrinks the loss before it reaches the next one.

A loss fully blocked by the at-risk rules never reaches the Section 461(l) calculation at all. A loss suspended under the passive activity rules does not count toward your aggregate business loss for this test either. Only losses that survive the first two gates get measured against the threshold, and losses suspended earlier carry forward under their own separate rules.

What Happens to the Disallowed Amount

An excess business loss does not disappear. Under Section 461(l)(2), the disallowed amount is treated as a net operating loss for the year it was created and carries forward under Section 172.² Once it converts, it sheds the excess business loss label and is no longer tested against the 461(l) threshold in future years.

NOL carryforwards have their own ceiling, though. For tax years beginning after 2020, the NOL deduction cannot exceed 80% of your taxable income for the year, calculated before the NOL deduction itself and without regard to the Section 199A qualified business income deduction.⁵ If your taxable income before the NOL deduction is $200,000, you can use up to $160,000 of the carryforward that year. The remainder continues forward indefinitely. You eventually get the full deduction, but the timing shifts.

Filing Form 461

Form 461 is where the IRS confirms you applied the limitation correctly. Attach it to your Form 1040, Form 1040-SR, or Form 1041, depending on whether you file as an individual or as a trust or estate.⁶ The form pulls from the same schedules you already complete, and most tax software packages it automatically once the underlying data is in.⁷ Use the version of the form that matches your tax year; prior-year forms cause processing delays.

Penalty Exposure for Getting It Wrong

Overstating a business loss deduction is not a low-stakes error. If claiming more than the limitation allows produces a substantial understatement of tax, the IRS can assess an accuracy-related penalty equal to 20% of the underpayment.⁸ For individuals, a substantial understatement means tax was understated by the greater of 10% of the correct liability or $5,000. The IRS may waive the penalty for reasonable cause and good faith, but that is not something to rely on when large losses from multiple entities are in play.

How Long the Limitation Is in Effect

Section 461(l) was originally enacted as a temporary provision under the Tax Cuts and Jobs Act and was set to expire after 2025. The Inflation Reduction Act of 2022 extended it through tax years beginning before January 1, 2029, so it currently applies through the 2028 tax year.⁹ The 2026 tax year is squarely within that window.

State Conformity

State tax treatment does not always match the federal rule. Conformity to IRC Section 461(l) varies, and some states let you deduct the full business loss that federal law disallows. If your state does not conform, your state taxable income will differ from your federal figure. If it does conform, deducting the full loss on the state return is exactly the kind of mismatch that draws an adjustment notice. Check your state’s conformity rules before filing.

1
Internal Revenue Service. Revenue Procedure 2025-32
2
Office of the Law Revision Counsel. 26 USC 461 – General Rule for Taxable Year of Deduction
3
Internal Revenue Service. Instructions for Form 461 – Limitation on Business Losses
4
Legal Information Institute. 26 USC 461(l)(3) – Excess Business Loss
5
Office of the Law Revision Counsel. 26 USC 172 – Net Operating Loss Deduction
6
Internal Revenue Service. Instructions for Form 461 (2025)
7
Internal Revenue Service. About Form 461 – Limitation on Business Losses
8
Internal Revenue Service. Accuracy-Related Penalty
9
Congress.gov. Expiring Provisions in the Tax Cuts and Jobs Act (TCJA, P.L. 115-97)