The Qualified Business Income (QBI) deduction, sometimes called the Section 199A deduction after its Internal Revenue Code section, allows eligible pass-through business owners to deduct up to 20% of their qualified business income from federal taxable income. For a sole proprietor, S-Corp owner, or partnership member with $150,000 of qualified business income, the QBI deduction can reduce taxable income by $30,000, a federal tax savings of roughly $7,000 to $11,000 depending on marginal rate. Across the approximately 30 million pass-through businesses in the United States, QBI is one of the single largest tax provisions of the last decade.
The complication: QBI has income thresholds, business-type restrictions, wage-and-property tests, and aggregation rules that make the actual deduction for many owners smaller than the headline "20%" suggests. For "specified service trade or business" owners (doctors, lawyers, accountants, consultants, financial advisors, and several others), the deduction phases out entirely at higher income levels. For non-SSTB businesses above the threshold, a wage-and-property test limits the deduction. Understanding which category a business falls into, and planning around the thresholds, is worth real money for anyone operating near the phaseout levels.
Who Qualifies for QBI
The deduction is available to most pass-through business owners, with specific eligibility rules.
| Entity Type | QBI Eligible? | Notes |
|---|---|---|
| Sole Proprietor / Schedule C | Yes | Most common QBI situation |
| Single-Member LLC (default) | Yes | Taxed as sole proprietor by default |
| Partnership / Multi-Member LLC | Yes | Each partner claims QBI on their share |
| S-Corporation | Yes | Shareholders claim on pass-through income (not W-2 wages) |
| C-Corporation | No | C-Corps have separate 21% corporate tax, no QBI |
| Rental Real Estate | Sometimes | Requires 'trade or business' level of activity (safe harbor available) |
The Three Scenarios
Where taxable income falls relative to the thresholds determines how QBI is calculated.
Below the Threshold ($383,900 MFJ / $191,950 Single for 2025)
The simple case. Deduction equals 20% of QBI, capped at 20% of taxable income minus net capital gains. Business type (SSTB or not) doesn't matter below the threshold. Most small business owners fall here.
Within the Phaseout Range ($383,900-$483,900 MFJ / $191,950-$241,950 Single)
The deduction phases out for SSTBs and is subject to partial wage/property limits for non-SSTBs. Planning becomes critical, reducing taxable income through retirement contributions, timing income, or other strategies can substantially preserve the deduction.
Above the Phaseout Range ($483,900 MFJ / $241,950 Single)
SSTBs get no QBI deduction. Non-SSTBs get a deduction equal to the lesser of 20% of QBI OR the greater of (a) 50% of W-2 wages paid, or (b) 25% of W-2 wages plus 2.5% of qualified property basis. The wage test makes businesses with employees more deduction-eligible than solo owners at these income levels.
The SSTB Problem
SSTBs (specified service trades or businesses) include health, law, accounting, consulting, financial services, performing arts, athletics, and 'any trade or business where the principal asset is the reputation or skill of one or more employees.' Above the phaseout range, SSTB owners get no QBI deduction, a significant tax cost that can favor C-Corp conversion in specific high-income scenarios.
Calculating QBI
The calculation has specific add-backs and subtractions that affect the deduction size.
QBI = net business income from a qualified trade or business, minus deductions "properly allocable" to that income. Specifically excluded: W-2 wages paid to owner (for S-Corp owners, salary is not QBI), guaranteed payments to partners (not QBI to the partner), reasonable compensation from S-Corp, investment income (dividends, interest, capital gains), and income from outside the U.S. For a sole proprietor with $200K Schedule C net income, QBI is typically the full $200K (less SE tax deduction). For an S-Corp owner with $100K salary + $100K distribution, QBI is the $100K distribution (salary is not QBI). This interaction between reasonable salary and QBI is where S-Corp tax planning gets complex, lower salary means higher QBI base but risks IRS reasonable compensation scrutiny.
Planning Strategies Around Thresholds
Careful planning can preserve QBI for owners near the phaseout range.
Strategies to Stay Below Thresholds
- Maximize retirement contributions (Solo 401(k), SEP, defined benefit)
- Time major income (defer year-end billings, accelerate next-year expenses)
- HSA contributions if eligible (reduce AGI)
- Charitable bunching in alternate years
- Section 179 or bonus depreciation to reduce current-year income (but reduces QBI base too)
- Income-splitting with spouse (where legal and genuine)
Strategies Above Thresholds (Non-SSTBs)
- Maintain W-2 payroll, supports the 50% W-2 wage test
- Consider acquiring qualified property, the 2.5% property test helps
- Structure as S-Corp to make salary-as-wages (helps wage test)
- Aggregate businesses under 199A rules for optimal wage/property allocation
- Evaluate C-Corp conversion for SSTBs where 21% corporate rate beats personal rate
- Time major capital purchases to maintain property base
Documentation and Calculation
QBI requires clean income attribution and proper aggregation decisions.
- Clean pass-through income calculation (QBI is net business income minus related deductions)
- W-2 wage data for 199A calculation if above threshold (total W-2 wages, not net salary after payroll tax)
- Unadjusted basis of qualified property for the 2.5% test
- Aggregation election if grouping multiple businesses (once made, typically binding)
- SSTB determination, documented rationale if ambiguous
- Net operating loss carryforward tracking (QBI carries separately from regular NOLs)
- State conformity check, some states don't conform to QBI deduction, affecting state tax
- Form 8995 (simplified) or 8995-A (full) filed with the federal return
The QBI deduction is available to most small business owners and can reduce federal tax by 20% of business income for those below the threshold, a significant benefit taken almost automatically. Above the threshold, it becomes a planning problem rather than an automatic benefit: SSTBs face phaseout, non-SSTBs face wage/property tests, and the interaction with retirement contributions, S-Corp salary, and major purchases creates opportunities for active management. QBI is also scheduled to expire at the end of 2025 under current TCJA sunset provisions, whether Congress extends it is an open question. For owners near the thresholds, annual QBI planning with a CPA is often worth multiples of the planning cost.
Run QBI projections in Q3 or Q4 before year-end, not at tax filing time. If projected taxable income is close to the phaseout threshold, a targeted retirement contribution (even $5,000 more into a Solo 401(k)) can preserve tens of thousands of dollars of QBI deduction. The saving-to-deduction ratio at the phaseout edge is extraordinary, among the highest-ROI tax planning moves available to upper-middle-income pass-through owners. Don't discover this in March when the year is already closed.
Frequently Asked Questions
Common SSTBs: doctors, dentists, lawyers, accountants, actuaries, consultants, financial advisors, investment managers, performing artists, professional athletes, and brokerage/financial services. Specifically NOT SSTB: engineering, architecture, most consulting-adjacent businesses where services aren't based on individual reputation/skill. The regulations are specific and sometimes counterintuitive, a one-off classification mistake can be costly at higher income levels.
Sometimes. Rental real estate must rise to the level of a "trade or business" for QBI purposes. The IRS published a safe harbor (Rev. Proc. 2019-38) for rental enterprises: 250+ hours of rental services per year, separate books/records, contemporaneous records of services. Meeting the safe harbor is the cleanest path; not meeting it requires facts-and-circumstances analysis that the IRS may challenge.
No. Your W-2 wages are excluded from QBI, they're your compensation, not business income. Only the pass-through distribution portion of S-Corp income counts as QBI for the owner. This creates the S-Corp planning tension: lower salary increases QBI-eligible income but invites IRS reasonable compensation challenge.
Yes. A negative QBI year creates a QBI carryforward that offsets positive QBI in future years. The carryforward is business-specific in many cases and should be tracked separately from regular NOLs. Multi-business owners should track QBI by business and aggregate carefully.
Sources
- SMAART Company. Small Business QBI Planning Frameworks, 2026.
- Internal Revenue Code Section 199A, 2025.
- Internal Revenue Service. Final Regulations on Section 199A, TD 9847.
- American Institute of Certified Public Accountants. QBI Deduction Planning, 2025. aicpa.org
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