The qualified business income deduction (often called the QBI deduction or Section 199A deduction) can let eligible owners of pass-through businesses deduct up to 20% of qualified business income on their Form 1040, subject to income limits, wage/property tests at higher incomes, and special rules for specified service trades or businesses (SSTBs). It is an individual-level deduction created by the Tax Cuts and Jobs Act, separate from writing off ordinary business expenses on Schedule C.
Pass-through context: W-2 vs 1099 tax basics. Cash-flow and withholding cousins: Self-employment tax basics and Side hustle quarterly taxes. Filing workflow: Filing taxes for beginners.
What QBI is (and is not)
| Idea | Plain meaning |
|---|---|
| Pass-through income | Profit from sole props, partnerships, S corps, and some trusts/estates that “passes” to your return |
| QBI | Qualified items of income, gain, deduction, and loss from an eligible trade or business (definitions are technical) |
| Deduction cap concept | Often up to 20% of QBI, further limited by taxable income and other tests |
| Not a business expense | It does not reduce self-employment tax the way Schedule C expenses can |
| Not automatic for all side hustles | Hobby rules, SSTB limits, and W-2-only income do not create QBI |
Wage income from a job is not QBI. Investment income has separate rules (REITs and publicly traded partnerships have specialized 199A treatments beyond this intro).
How it interacts with self-employment tax
You can owe self-employment tax on net earnings and still claim a QBI deduction against income tax if you qualify. The SE tax “employer-equivalent” deduction and the QBI deduction are different lines with different purposes, see Self-employment tax basics. Paying quarterly estimates still matters when profit spikes: Estimate quarterly taxes.
Income phaseouts and SSTBs (orientation only)
Thresholds and phase-in ranges change with inflation each tax year. In broad strokes:
- Below the annual taxable-income threshold, many non-SSTB and SSTB owners may claim the deduction without the wage/property limitation.
- Above the threshold, specified service businesses (examples often discussed include many health, law, consulting, financial, and athletic service fields, check current IRS definitions) can see the deduction reduced or eliminated.
- Non-SSTB businesses over the threshold face W-2 wage and qualified property limitations.
Use IRS Form 8995 or 8995-A and the year’s instructions, or tax software / a CPA, not a blog memory of last year’s dollar amounts.
Worked example (illustrative structure only)
Sam runs a sole-prop online store (assume non-SSTB for this sketch) with $80,000 Schedule C profit after expenses. Taxable income on the Form 1040 is under that year’s QBI threshold after the standard deduction (Standard vs itemized). Rough orientation: QBI for a sole prop is generally Schedule C profit minus the deductible half of self-employment tax (and other adjustments on Form 8995). On $80,000 profit, half of SE tax is often a few thousand dollars, so QBI might land near the mid-$70,000s and a 20% deduction near ~$14,800, not a raw 0.20 × $80,000 = $16,000. The deduction is also capped by taxable-income guardrails. Sam still pays self-employment tax on net earnings per Schedule SE. Software applies Form 8995 math.
If Sam instead were a high-income SSTB consultant over the phaseout, that mid-$14,000s sketch could fall to $0. Entity choice (S corp reasonable salary, etc.) is a planning topic for a tax professional, not a DIY from this page.
Recordkeeping habits that help
- Separate business checking for Stripe/Square deposits.
- Track ordinary expenses so QBI starts from accurate profit.
- Keep K-1s if you are a partner or S corp shareholder, QBI components often appear in statements.
- Note whether your work may be an SSTB under IRS definitions.
- Re-estimate quarters when profit or filing status changes (Side hustle quarterly taxes).
Checklist
- Confirm you have an eligible trade or business, not only W-2 wages.
- Compute profit correctly on Schedule C or via K-1 before thinking about 20%.
- Check that year’s taxable-income thresholds on IRS.gov.
- Screen SSTB status if you provide professional or personal services.
- File Form 8995 or 8995-A as required; keep worksheets.
- Do not confuse QBI with SE tax reduction or with the standard deduction.
Rental losses you cannot use this year may be suspended under passive activity rules - separate from QBI: Passive activity loss basics.
A large Schedule C or pass-through loss year may raise NOL carryforward questions after QBI is zero: NOL basics.
Educational only. Not tax advice. Section 199A rules, thresholds, and definitions change; verify with current IRS publications and a qualified tax professional.