Section 199A QBI Deduction (2026)

Twenty percent off pass-through income—when the fine print allows

Section 199A offers up to a 20% deduction on qualified business income from pass-through entities and sole proprietorships. High-income specified service professionals hit phaseouts; capital-intensive businesses face W-2 wage and qualified property limits. The deduction does not reduce self-employment tax base—only income tax.

Enter QBI amount, taxable income, filing status, SSTB flag, W-2 wages from business, and UBIA of qualified property. The calculator applies 2026 threshold concepts from Rev. Proc. 2025-32 for educational estimates.

2026 taxable income thresholds

Phase-in ranges for limitation rules inflation-adjust each year—consult Rev. Proc. 2025-32 for exact 2026 dollar starts for single and joint filers. Below threshold, simpler 20% × QBI often applies; above, W-2/UBIA limits and SSTB phaseouts dominate.

How to use the calculator

Step 1 — Enter QBI from Schedule C or K-1

Net qualified business income after deductions, excluding investment items.

Step 2 — Flag SSTB and enter wages/UBIA

Doctors, attorneys, accountants, consultants, etc. face SSTB rules; manufacturers enter W-2 wages paid and qualified property basis.

Step 3 — Read limited deduction

Deduction capped at 20% of QBI, 20% of taxable income minus net capital gain, and limitation formulas at high income.

Worked example sketch

$80,000 QBI from non-SSTB business, $70,000 taxable income before QBI, sufficient W-2 wages → deduction near $14,000–$16,000 depending on capital gain offsets—run precise inputs above.

S-corp salary trade-off

Lower S-corp salary saves FICA but reduces W-2 wages for QBI limit—balance in S-corp vs LLC calculator and here.

Rental and REIT income

Rental real estate may qualify if trade or business safe harbor met. Passive losses still limited separately—passive activity loss calculator.

Common mistakes

• Applying QBI to W-2 wages
• Ignoring SSTB status for consulting income
• Expecting QBI to reduce SE tax
• Missing cooperative and agricultural special rules

Related tools

Schedule C: 1099 tax calculator. S-corp: S-corp vs LLC calculator. Federal: federal income tax calculator.

SSTB phaseout detail

Specified service trade or business phaseout range for 2026 follows taxable income thresholds in Rev. Proc.—dentists and consultants near threshold see partial QBI; one dollar above top of range may zero deduction for SSTB while manufacturer still gets W-2/UBIA limited deduction. Patron dividends from cooperatives and agricultural rules add complexity this tool simplifies.

W-2 wage and UBIA limitation mechanics

For non-SSTB above threshold, deduction limited to greater of 50% W-2 wages from business or 25% W-2 wages plus 2.5% UBIA of qualified property—capital-heavy manufacturing may use UBIA path when wages low.

Specified service trade or business list includes health, law, accounting, consulting, athletics, financial services, and reputation/skill fields—fin-tech consulting may be SSTB while product SaaS may not depending on facts.

Patrons of agricultural cooperatives have separate Section 199A(g) rules—not QBI from Schedule C in same form as pass-through deduction on cooperative dividends.

Reading your results for section 199a qbi deduction

The interactive panel above shows a transparent calculation trace in cents—use it to sanity-check inputs before you rely on any number for decisions. Tax software at filing time may differ when every credit, limitation, and state conformity rule is applied in full. Treat output here as structured planning math aligned to 2026 federal reference data where noted, not as e-file output or professional advice.

When your situation includes items this specialized tool simplifies—multiple entities, prior-year carryforwards, treaty elections, or state nonconformity—layer those facts manually or with a preparer. The goal is to narrow uncertainty enough to ask better questions, not to eliminate the need for review when dollars are material.

Recordkeeping that survives scrutiny

Keep source documents (forms, statements, logs, confirmations) that support every input you typed. IRS and state audits often start from third-party reporting; your job is to reconcile 1099s, K-1s, and broker exports to the story you file. Digital backups with dates beat reconstructed spreadsheets created after an notice arrives.

For section 199a qbi deduction, retain worksheets year to year when carryforwards exist—loss carryovers, credit carryforwards, passive loss suspensions, and basis schedules die silently if you change preparers and lose history.

Related tools on this site

Schedule C: 1099 tax calculator. S-corp wages: S-corp vs LLC calculator.

2026 federal brackets and payroll context

Ordinary income tax brackets and standard deductions for 2026 follow IRS Rev. Proc. 2025-32 ($16,100 single / $32,200 joint standard deduction; seven marginal rates from 10% to 37%). Social Security tax applies at 6.2% on wages up to the $184,500 wage base; Medicare continues at 1.45% with Additional Medicare Tax above threshold wages. These layers stack independently from specialized rules modeled in this section 199a qbi deduction tool—run the federal income tax calculator when you need the full return picture.

Quarterly estimated tax may be required when withholding does not cover liability—see the quarterly estimated tax calculator. Year-end refund or balance due comparisons belong in the tax refund estimator once withholding and payments are known.

Before filing season

Reconcile this section 199a qbi deduction calculator estimate against draft Form 1040 lines and attached schedules your software produces. Look for mismatches in basis, carryforwards, and state add-backs—the first pass with a specialized calculator often misses secondary limits that full return software catches. Update inputs when you receive final 1099s, K-1s, and corrected broker statements; January revisions are normal.

If results imply large balance due, adjust withholding or estimated payments before December 31 when possible—penalties accrue on underpayment even when you file timely in April. If results imply large refund, you may be over-withholding or overpaying estimates; tune W-4 or voucher amounts for better cash flow without chasing refunds as a savings strategy.

State returns often piggyback federal logic but diverge on conformity items. Re-run state tools when federal inputs change materially so you do not pay state estimates based on federal-only planning from this section 199a qbi deduction calculator page.

Sources and methodology

Section 199A under IRC; thresholds Rev. Proc. 2025-32. Simplified limitation math. Educational.