Excess Business Loss Limitation: How IRC 461(l) Caps Your Business Loss Deduction

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

IRC 461(l) limits the amount of aggregate business losses that non-corporate taxpayers (individuals, trusts, estates) can use to offset non-business income in any single tax year. For 2025, the threshold is $305,000 for single filers and $610,000 for married filing jointly (these amounts are inflation-adjusted annually). Any business loss exceeding the threshold isn’t lost permanently but becomes a net operating loss (NOL) carryforward under IRC 172, usable in future years (limited to 80% of taxable income). The limitation was originally enacted by the Tax Cuts and Jobs Act (TCJA) for tax years 2018 through 2025, suspended for 2018-2020 by the CARES Act, and has been extended through 2032 by the One Big Beautiful Bill Act (OBBBA). The rule applies after passive activity loss rules (IRC 469) and at-risk rules (IRC 465) have been applied, meaning it is the final limitation on business losses.

✓Key takeaway

Excess business loss limitation basics:

Factor	Details
Applies to	Individuals, trusts, estates (NOT C-Corps)
2025 threshold	$305,000 (single) / $610,000 (MFJ)
Inflation-adjusted?	Yes (annually)
Extended through	2032 (OBBBA)
What happens to excess	Becomes NOL carryforward (80% of taxable income limit)
Applied after	Passive activity rules (IRC 469) and at-risk rules (IRC 465)

Order of loss limitations:

Step	Limitation	Code Section
1. Basis limitation	Loss limited to shareholder/partner basis	IRC 704(d), 1366(d)
2. At-risk limitation	Loss limited to amount at risk	IRC 465
3. Passive activity limitation	Passive losses only offset passive income	IRC 469
4. Excess business loss limitation	Aggregate business losses capped at threshold	IRC 461(l)

What counts as “business” income/loss:

Business Income/Loss (Aggregated)	NOT Business Income/Loss
Schedule C net income/loss	Wages and salaries
Partnership/S-Corp K-1 business income/loss	Capital gains/losses (investment)
Rental income/loss (if active)	Interest and dividends
Farm income/loss	Social Security benefits
Section 1231 gains/losses	Retirement distributions
Business capital gains/losses	Alimony

How does the excess business loss limitation work?

Hypothetical example

Round numbers. For current guidance, see IRS net operating loss guidance. A married couple filing jointly. Multiple business interests:

Source	Income/(Loss)
S-Corp #1 (consulting, materially participates)	$200,000
S-Corp #2 (restaurant, materially participates)	($500,000)
Rental property (active participation)	($150,000)
Schedule C (side business)	($250,000)
Wife’s W-2 wages	$180,000
Investment income (dividends, interest)	$50,000
Total income	($470,000)

Step 1: Aggregate business income and losses

Business Activity	Amount
S-Corp #1 (income)	$200,000
S-Corp #2 (loss)	($500,000)
Rental (loss)	($150,000)
Schedule C (loss)	($250,000)
Net business loss	($700,000)

Step 2: Apply the excess business loss limitation

Item	Calculation
Net business loss	($700,000)
MFJ threshold (2025)	$610,000
Allowable business loss	($610,000)
Excess business loss (becomes NOL carryforward)	($90,000)

Step 3: Calculate taxable income

Item	Amount
W-2 wages	$180,000
Investment income	$50,000
Allowable business loss	($610,000)
Taxable income before deductions	($380,000)

The $610,000 allowable business loss exceeds all non-business income ($230,000), creating a negative taxable income and a current-year NOL. The couple has the $90,000 excess business loss carryforward PLUS the current-year NOL.

Year 2: Using the NOL carryforward

Item	Amount
S-Corp #1 income	$200,000
S-Corp #2 income (recovered)	$100,000
W-2 wages	$180,000
Investment income	$50,000
Taxable income before NOL	$530,000
NOL deduction (80% of $530,000)	($424,000)
Taxable income after NOL	$106,000

The 80% NOL limitation: The NOL carryforward is limited to 80% of taxable income in any given year. This means the couple can never fully eliminate their tax liability using NOL carryforwards alone.

Taxable Income (Before NOL)	Max NOL Deduction (80%)	Minimum Taxable Income
$100,000	$80,000	$20,000
$300,000	$240,000	$60,000
$500,000	$400,000	$100,000

Planning strategies:

Strategy	Effect
Time losses across years	Keep each year’s net business loss under the $610,000 threshold
Accelerate business income	Shift income into the loss year to absorb more of the loss currently
Defer expenses	Push discretionary expenses to a year with positive business income
Consider C-Corp structure	C-Corps are not subject to IRC 461(l); losses offset corporate income without the cap

The excess business loss limitation prevents high-income taxpayers with massive business losses from eliminating their entire tax liability in a single year. The losses are preserved (as NOL carryforwards) but spread over multiple years, always leaving at least 20% of income taxable.

Illustrative numbers only, not a real client and not advice for your facts.

In what order do loss limitation rules apply?

Business losses must clear four successive hurdles before they can offset other income. First, the basis limitation: you can only deduct losses up to your tax basis in the business (for S-Corps, this includes stock basis and shareholder loan basis). Second, the at-risk rules (IRC 465): losses are limited to amounts you have at risk, which generally means cash invested plus recourse debt you’re personally liable for. Third, the passive activity rules (IRC 469): if you don’t materially participate, losses are passive and can only offset passive income. Fourth, the excess business loss limitation (IRC 461(l)): even if a loss clears the first three hurdles, the deduction is capped at $305,000 ($610,000 for joint filers in 2024), with the excess converted to a net operating loss carryforward.

Related guides:

At-Risk Rules (IRC 465): How Much of Your Business Loss You Can Actually Deduct

How do net operating loss carryforward rules work for small businesses?

Net operating losses arising in tax years after 2017 can be carried forward indefinitely but are limited to offsetting 80% of taxable income in any future year under IRC 172(a). The 80% limitation means a business with a large NOL carryforward will always pay some tax in profitable years, unlike pre-TCJA rules that allowed 100% offset. NOLs can no longer be carried back to prior years for most businesses (the CARES Act temporarily allowed 5-year carrybacks for 2018-2020 losses, but that provision has expired). Farming businesses retain a 2-year carryback option, and property and casualty insurance companies retain a 2-year carryback with no 80% limitation, which are the only remaining exceptions to the forward-only rule.

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Cite this page

Yarik Yarosh, CPA. "Excess Business Loss Limitation: How IRC 461(l) Caps Your Business Loss Deduction." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-aggregate-loss-cap-irc-461l-nol-carryforward

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.