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    NOL and Business Losses Guide

    TaxKiln Editorial · Last reviewed:

    A Net Operating Loss (NOL) arises when business deductions exceed business income. Under TCJA, NOLs from tax years beginning after 2017 carry forward indefinitely (no carryback) and can offset only 80% of taxable income in any future year. Separately, IRC §461(l) caps the amount of business loss a non-corporate taxpayer can use against non-business income at $305,000 single / $610,000 MFJ for 2026 — the excess becomes an NOL carried to the next year.

    What is a NOL

    A Net Operating Loss is created when allowable business deductions exceed gross income, computed with specific NOL modifications: (a) no NOL deduction itself, (b) no §199A QBI deduction, (c) no capital loss in excess of capital gain, (d) no §1202 QSBS exclusion. The NOL is the negative number after those adjustments — and gets carried forward to offset future taxable income.

    Carry-forward (no carryback) and the 80% cap

    For NOLs arising in tax years beginning after 12/31/2017 (the post-TCJA regime): • Carryback: not allowed (with narrow farming exception) • Carryforward: indefinite — until fully consumed • Usage limit: 80% of taxable income calculated WITHOUT the NOL deduction The 80% cap means a business cannot use NOLs to wipe out 100% of a good year — at least 20% of taxable income is always exposed to current-year tax. This significantly slows down NOL absorption for cyclical businesses. NOLs from pre-2018 years retain the old rules (2-year carryback, 20-year forward, 100% usage) until exhausted. Maintain separate NOL tracking schedules for vintage.

    The §461(l) excess business loss limitation

    Even before applying NOL carryforward, §461(l) limits how much CURRENT-YEAR business loss a non-corporate taxpayer can use against other income (wages, interest, dividends, capital gains). For 2026: • Single / HoH / MFS: $305,000 • MFJ: $610,000 The excess is disallowed in the current year and converts to an NOL carryforward for the next tax year — where it is then subject to the 80% usage cap. This is a two-layer haircut on business losses for high-loss founders and active investors. Example: a real-estate investor with $800,000 of bonus-depreciation Schedule E losses and $200,000 of wages. For 2026 single: Allowed against wages: $305,000 Disallowed (becomes 2027 NOL): $495,000 Net 2026 income: 200,000 − 305,000 = -105,000 → wait, business loss is capped at the 305k against non-business income; the limitation just defers, doesn't eliminate.

    Business income / loss for §461(l) purposes

    Aggregation rules under §461(l)(6) treat all trades or businesses of the taxpayer (including K-1 passthroughs) together. Wages from being an employee are NOT business income for §461(l). Capital gains and losses from §1221 capital assets are also excluded from the §461(l) computation. The upshot: a taxpayer with $2M of wages and $1M of K-1 loss from active partnerships will hit the §461(l) cap and convert the excess to a forward NOL — they cannot zero out W-2 income through unlimited business loss in a single year.

    Interaction with passive activity rules

    §461(l) sits ON TOP OF §469 passive activity loss rules. The §469 PAL rules disallow passive losses against active and portfolio income first — only losses that survive §469 reach §461(l). For real estate investors: 1. Apply §469 — passive losses to passive income (or carry forward) 2. If real-estate professional status (REPS): losses become active and skip §469 3. Apply §461(l) cap to remaining active business losses 4. Excess converts to NOL → 80% cap applies next year Getting REPS unlocks current-year loss deduction but does NOT bypass the §461(l) cap.

    Worked example: Helena Park, REPS-qualified real estate investor (Single, 2026)

    Helena's 2026 income: $250,000 wages from a real-estate brokerage (W-2), $40,000 interest. Her rental property portfolio generates $720,000 of losses (bonus depreciation on a newly acquired multifamily). She qualifies as a Real Estate Professional under §469(c)(7).

    Step 1 — §469 PAL: REPS status converts the rental losses from passive to active. No §469 disallowance. Step 2 — §461(l) excess business loss test: Business loss (rental): -720,000 Business income: 0 Net business loss: -720,000 Cap for single 2026: $305,000 Allowed against non-business income: 305,000 Disallowed (→ 2027 NOL): 720,000 − 305,000 = 415,000 Step 3 — 2026 taxable income: Non-business: 250,000 wages + 40,000 interest = 290,000 Business loss allowed: -305,000 Total: 290,000 − 305,000 = -15,000 Wait — the cap allows USING $305k of business loss against $290k of non-business income. The result: AGI of -15,000? Actually §461(l) caps at $305,000, so $305k of loss is allowed; the negative AGI itself becomes a 2026 NOL. 2026 NOL: 15,000 (carried to 2027 under post-TCJA rules) §461(l) disallowed loss → 2027 NOL: 415,000 Total 2027 NOL inventory: 430,000 Step 4 — 2027 utilisation: If 2027 taxable income (before NOL) = $500,000 NOL usable: 80% × 500,000 = 400,000 Use 400,000 of the 430,000 NOL; 30,000 carried to 2028. 2027 taxable income: 500,000 − 400,000 = 100,000.

    Statute references

    • Net Operating Loss deduction — IRC §172
    • Excess business loss limitation — IRC §461(l)
    • Passive activity loss rules — IRC §469
    • Real estate professional exception — IRC §469(c)(7)
    • OBBBA permanent extension of §461(l) — OBBBA §70401

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