QBI Deduction (Section 199A)

The Qualified Business Income (QBI) deduction — created by the Tax Cuts and Jobs Act of 2017 and codified at 26 U.S.C. § 199A — allows owners of pass-through businesses (sole proprietorships, S corporations, partnerships, and LLCs) to deduct up to 20% of their qualified business income from federal taxable income. For a business owner with $200,000 in QBI, the deduction reduces taxable income by $40,000 — effectively cutting the federal rate on that income from 37% to roughly 29.6%. The deduction was Congress's response to the TCJA's reduction of the corporate rate to 21%: rather than create a massive incentive to convert pass-throughs to C-corporations, Congress built a parallel benefit for non-corporate business income. The deduction is limited and phased out for Specified Service Trade or Business (SSTB) owners — doctors, lawyers, consultants, financial advisors, and others in personal-service fields — once income exceeds $201,750 (single) / $403,500 (MFJ) in 2026. Above the phase-out ceiling ($276,750/$553,500), SSTB owners receive zero deduction. Non-SSTB businesses above the income threshold face W-2 wage and qualified property limitations but are not fully phased out. The QBI deduction is scheduled to expire after 2025 under TCJA's sunset provisions — extending it (or making it permanent) is one of the central pieces of 2025–2026 tax legislation.

Current Law (2026)

Pass-through business owners (sole proprietors, S-corps, partnerships, LLCs) can deduct up to 20% of qualified business income from taxable income.

Parameter	2026 Value
Deduction rate	20% of QBI
Threshold (Single/HOH)	$201,750
Threshold (MFJ)	$403,500
Phase-out range	$75,000 (single/HOH) / $150,000 (MFJ)
Full phase-out ceiling	$276,750 (single/HOH) / $553,500 (MFJ)
Specified service trades (SSTB)	Fully phased out above threshold + range

Legal Authority

26 U.S.C. § 199A — Qualified business income
26 CFR 1.199A-1 through 1.199A-6 — Final regulations

How It Works

Below the taxable income threshold ($201,750 single / $403,500 MFJ in 2026), the deduction is straightforward: 20% of QBI with no further limitations. A sole proprietor with $100,000 in QBI deducts $20,000, reducing taxable income to $80,000 — saving $4,400–$7,400 in federal taxes depending on bracket. Above the threshold, the deduction is limited to the greater of two tests: (a) 50% of W-2 wages paid by the business, or (b) 25% of W-2 wages plus 2.5% of the unadjusted basis of qualified depreciable property. This is why a sole proprietor with high income but no employees can face a drastically reduced or zero deduction — there are no W-2 wages to run the test against. The threshold applies gradually within the phase-out range ($201,750–$276,750 single; $403,500–$553,500 MFJ), where both the SSTB restriction and the W-2/property limitation phase in proportionally.

Specified Service Trades or Businesses (SSTBs) — a category including law, medicine, accounting, consulting, financial services, performing arts, and athletics — lose the deduction entirely above the phase-out ceiling ($276,750 single / $553,500 MFJ). Within the phase-out range, SSTB owners get a partial deduction. Below the threshold, they get the full deduction like anyone else. Non-SSTB businesses above the threshold face the W-2/property limitation but are never fully phased out the way SSTBs are — high-wage or capital-intensive non-service businesses can still claim a meaningful deduction at any income level.

The deduction is below-the-line — it reduces taxable income but not AGI, similar to the standard deduction. This means it doesn't help with AGI-based calculations like Medicare IRMAA premiums, ACA premium subsidies, or Roth IRA phase-outs. Your filing status determines which income threshold applies. The deduction also extends to qualified REIT dividends and publicly traded partnership (PTP) income — a meaningful provision because the 20% REIT deduction applies regardless of W-2 wage limitations, making REIT income more tax-efficient for high-income investors who don't qualify for the deduction on their business income. Business owners with multiple qualified businesses can elect to aggregate them for purposes of the W-2 wage test, potentially increasing the combined deduction. Rental real estate income may qualify under a safe harbor requiring 250+ hours of rental services per year — see Rental Property Tax Rules for the full requirements.

Current 2026 Framework

Section 199A remains in force under current 2026 law. The main planning questions are no longer whether the deduction disappears after 2025, but whether your taxable income is above the current threshold, whether the W-2 wage/property limits apply, and whether you are in a specified service trade or business. Current law also adds a minimum deduction rule for some active QBI filers beginning in 2026.

How It Affects You

If you're a sole proprietor, freelancer, or Schedule C filer with income below the phase-out threshold: This deduction is straightforward and valuable. With QBI of $80,000, you deduct $16,000 — reducing your taxable income to $64,000 and saving $3,520–$5,280 in federal income tax depending on your bracket. No W-2 wage limitation applies below the threshold ($201,750 single/$403,500 MFJ for 2026). To maximize the deduction, consider reducing QBI through contributions to a Solo 401(k) (up to $70,000 if under 50) or a SEP-IRA — see also SEP-IRA contribution limits for current thresholds — (up to 25% of net self-employment income) — both reduce QBI dollar-for-dollar, which also reduces your self-employment tax base. Note that Section 179 expensing and bonus depreciation also reduce QBI, so large equipment deductions can simultaneously reduce your QBI deduction; weigh those tradeoffs with your tax advisor.

If you're a Specified Service Trade or Business (SSTB) — doctor, lawyer, accountant, financial advisor, consultant, or performing artist: The QBI deduction phases out entirely once your taxable income exceeds the upper boundary of the phase-out range ($276,750 single, $553,500 MFJ for 2026). Within the phase-out range ($201,750–$276,750 single), you get a partial deduction. Below $201,750 single ($403,500 MFJ), you get the full 20%. The strategic implication: if you're in the phase-out range, every dollar you reduce taxable income through retirement contributions, charitable deductions, or business deductions recovers part of your QBI deduction. Above the ceiling — no amount of structure restores the deduction for SSTB income.

If you run a non-SSTB business above the income threshold: Above the threshold, your deduction is limited to the greater of (a) 50% of W-2 wages paid by the business OR (b) 25% of W-2 wages + 2.5% of unadjusted basis in qualified property. If you're a sole proprietor with no employees, you pay yourself no W-2 wages — and your QBI deduction could be zero regardless of income. The solution many advisors recommend: elect S-corp status and pay yourself reasonable compensation as W-2 wages. Your W-2 salary (say $120,000) counts toward the W-2 wage test — 50% of that is $60,000 of potential QBI deduction. If you own commercial property or significant equipment in the business, the 2.5% of unadjusted basis test may produce a larger deduction — model both methods. Aggregating multiple qualified businesses may also increase the combined W-2 wage limitation.

If you're a tax professional structuring pass-through entities for clients: The QBI deduction creates a genuine structure question between sole proprietorship, partnership/LLC, and S-corp for pass-through income above the threshold. S-corps provide W-2 wages (the owner's reasonable compensation) that count toward the wage test — but S-corps add administrative costs (payroll, separate tax return) and require careful calibration of reasonable compensation. The minimum deduction rule added in 2026 benefits certain active QBI filers; review the regulations for your clients' situations. For REIT investors: qualified REIT dividends receive the 20% QBI deduction regardless of W-2 wage limitations — a useful strategy for high-income SSTB professionals who can't claim the deduction on their business income. Most high-tax states (CA, NJ, NY, PA) do not conform to § 199A, so the state tax picture doesn't benefit from the deduction — focus optimization on the federal liability.

State Variations

Most states do not conform to Section 199A:

CA, NJ, NY: Do not allow the QBI deduction for state tax purposes
PA: No itemized deductions; flat tax doesn't incorporate 199A
Some states partially conform or have their own pass-through deductions
This means the effective state tax benefit is zero in most high-tax states

Implementing Regulations

26 CFR Part 1 — Income tax regulations (sections 1.199A-1 through 1.199A-12: qualified business income definitions, qualified REIT dividends, W-2 wage limitation, specified service trades, cooperative patronage rules)
26 CFR 1.199A-3 — Qualified business income, qualified REIT dividends, and qualified PTP income (definitions of QBI, qualified items of income, gain, deduction, and loss; reasonable compensation limitation; calculation of W-2 wages and unadjusted basis immediately after acquisition)
26 CFR 1.199A-1 — Operational rules (overall QBI deduction calculation; combined QBI amount; threshold amounts; phase-in rules for SSTBs and W-2 wage limitation)
26 CFR 1.199A-10 — Allocation of cost of goods sold (the § 199A(g) cooperative deduction rules)
26 CFR 1.199A-11 — Wage limitation for § 199A(g) deduction (W-2 wages allocated to domestic production for cooperatives)

Pending Legislation (119th Congress)

HR 2603 (Rep. LaHood, R-IL) — Small Business Tax Fairness and Compliance Simplification Act. Would extend the employer tip credit to salon and spa services, create a tip-reporting safe harbor, and add $600 space-rental reporting for beauty professionals. Status: Introduced.
S 1386 (Sen. Cornyn, R-TX) — Small Business Taxpayer Bill of Rights Act of 2025. Would boost taxpayer and small-business protections by raising damages for IRS misconduct, expanding appeals and mediation, and restricting seizures of primary residences. Status: Introduced.
S 1998 (Sen. Scott, R-SC) — Small Business Tax Fairness and Compliance Simplification Act. Would expand the employer tip credit to salons and spas, create a tip-reporting safe harbor, and require $600+ space-rental income reporting. Status: Introduced.
HR 2782 (Rep. Kustoff, R-TN) — Small Business Taxpayer Bill of Rights Act of 2025. Creates stronger dispute options, tougher IRS oversight and discipline, levy limits, and offer-in-compromise changes. Status: Introduced.
HR 3275 (Rep. Craig, D-MN) — Small Business Tax Relief Act. Would reshape tax rules for investment managers, lower small-corp tax on first $400K, raise repurchase excise tax, and expand a deduction for many self-employed. Status: Introduced.

Recent Developments

Current law keeps the Section 199A deduction in place for 2026 as a continuing part of the pass-through business tax framework
IRS 2026 threshold amounts are $201,750 for most single filers and $403,500 for married couples filing jointly, with wider 2026 phase-out ranges than under prior law
OBBBA makes QBI deduction permanent and increases it (2025): The One Big Beautiful Bill Act permanently extended the Section 199A deduction — eliminating the prior-law 2026 sunset — and increased the deduction rate from 20% to 23% for qualified business income. The increase from 20% to 23% was a significant concession to small business and pass-through owner advocates who argued that the original 20% rate still left pass-through businesses at a disadvantage relative to C corporations (whose rate was cut to 21% by the TCJA). The permanent 23% QBI deduction applies to all qualified business income from partnerships, S corporations, and sole proprietorships.
SSTB limitation maintained — professional service firms still excluded from W-2/property limits: The OBBBA preserved the Section 199A structure, including the limitation for "specified service trade or business" (SSTB) owners — attorneys, physicians, consultants, financial advisors, and other professional service firms. SSTB owners above the income threshold get no QBI deduction at all, regardless of how much they pay in W-2 wages. The OBBBA did not expand the QBI deduction to SSTBs, despite lobbying from professional associations. The income thresholds (approximately $201,750/$403,500 in 2026) index for inflation — professional service firm owners below these thresholds still get the full deduction.
IRS QBI audit enforcement (2024-2025): The IRS has prioritized QBI compliance enforcement using data analytics to identify returns where the QBI deduction appears overstated. Common errors include: taking the deduction on W-2 wages paid to employee-owners (not qualified business income); including capital gains in QBI (not allowed); failing to apply the W-2 wage limitation correctly for businesses with employees; and claiming QBI deductions for SSTB owners above the income threshold. IRS has increased correspondence audits targeting QBI calculation errors, issuing CP2000 notices for mismatches between reported QBI and business income reported on Schedule K-1s.
Reasonable compensation and S corporation QBI optimization: The most common tax planning strategy around Section 199A involves S corporation owners who minimize their own W-2 salary (to maximize QBI deduction) while staying within "reasonable compensation" bounds for Social Security tax purposes. The IRS's reasonable compensation standard for S corporation shareholders requires that compensation be comparable to what an arm's-length employer would pay for the same services. Post-OBBBA, with the deduction increased to 23% and the capital gains rate structure unchanged, the marginal benefit of S corporation reasonable compensation minimization is slightly larger — creating continued IRS scrutiny of S corporation owner salary-vs.-distribution ratios.