How QBI works with an S Corp
Section 199A allows eligible owners a deduction of up to 20% of qualified business income, subject to taxable-income, business-type, W-2 wage, qualified-property, and overall taxable-income limits. For an S Corp shareholder, reasonable compensation paid by the corporation is expressly excluded from QBI.
Cash distributions do not determine QBI. The starting point is the shareholder's qualified share of pass-through business income after wages and other deductible corporate expenses. A distribution can differ from the K-1 income for the year, so calling the deduction 20% of distributions is misleading.
Why a $150,000 example needs more than two lines
Assume a business has $150,000 before owner wages and a defensible S Corp salary of $75,000. The remaining pass-through profit is not automatically $75,000. Employer payroll tax and other corporate expenses reduce it. The potential QBI deduction is then calculated from qualified pass-through income and remains subject to the taxpayer's taxable-income and business-type limits.
The sole-proprietor comparison also needs adjustments. QBI is generally reduced by deductions attributable to the business, which can include the deductible part of self-employment tax, self-employed health insurance, and qualified retirement-plan contributions. A correct comparison models both structures on the same facts instead of applying 20% to gross profit on one side and a cash distribution on the other.
An S Corp can still produce a better total result, but there is no universal $60,000 cutoff and no fixed two-to-three-times relationship between payroll-tax savings and a reduced QBI deduction. Reasonable compensation, filing status, other wages, state tax, payroll cost, retirement planning, and the type of business can change the answer.
What changed for 2026 under Public Law 119-21
Public Law 119-21 made the Section 199A deduction permanent and kept the maximum rate at 20%. For tax years beginning in 2026, the law also widened the limitation phase-in bands. The 2026 IRS thresholds begin at $201,750 for most non-joint returns and $403,500 for joint returns; the applicable phase-in endpoints are $276,750 and $553,500.
Beginning in 2026, the law also provides a $400 minimum deduction for an eligible taxpayer with at least $1,000 of QBI from an active trade or business in which the taxpayer materially participates. The $400 and $1,000 amounts are adjusted for inflation after 2026. These are 2026 rules; they should not be inserted into a 2025 return calculation.
What if you are a Specified Service Trade or Business?
For 2026, the SSTB limitation begins to phase in when taxable income exceeds $201,750 for most non-joint returns or $403,500 for joint returns. The phase-in endpoints are $276,750 and $553,500. Filing status and taxable income, not simply business revenue, determine where the limitation applies.
An SSTB owner above the applicable range may receive no QBI deduction from that SSTB, but that does not make an S Corp automatically beneficial or the only available planning tool. Reasonable compensation, payroll taxes, retirement-plan choices, state rules, and other deductions still require a full comparison.
The bottom line
Reasonable compensation comes first. The IRS says an S Corp must pay reasonable compensation to a shareholder-employee for services before making non-wage distributions, and those wages are excluded from QBI. Do not lower salary solely to increase a QBI deduction.
The right decision is a side-by-side model using the same profit, wage evidence, filing status, state, other wages, retirement contributions, health insurance, and compliance costs. The homepage calculator is an estimate for screening, not a tax-return computation or a guarantee of savings.
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