The QBI Deduction: 20% Pass-Through Income Tax Break for Business Owners
How the Section 199A QBI deduction works, income thresholds, phase-outs for specified service businesses, W-2 wage limitations, and planning strategies.
Section 199A Cut the Top Pass-Through Rate to 29.6% Overnight
The Tax Cuts and Jobs Act of 2017 created Section 199A, which allows eligible business owners to deduct up to 20% of qualified business income from their taxable income. When a sole proprietor in the 37% marginal bracket qualifies for the full deduction, the effective rate on pass-through income drops to 29.6%. For S-corporation shareholders, partnership partners, and self-employed individuals, this provision represents the largest structural change to pass-through taxation since the alternative minimum tax. The deduction is available through at least 2025, after which it expires unless Congress acts.
The Basic Calculation
Qualified Business Income (QBI) is the net amount of qualified items of income, gain, deduction, and loss from a qualified trade or business. Capital gains, dividends, interest income (unless from a financial services business), and W-2 wages earned as an employee are excluded. The deduction equals 20% of QBI — but only up to 20% of taxable income minus net capital gains. The smaller of these two figures applies.
| Scenario | QBI | 20% of QBI | Taxable Income Minus Capital Gains | QBI Deduction |
|---|---|---|---|---|
| Simple case | $150,000 | $30,000 | $120,000 | $24,000 (limited by taxable income test) |
| Higher income | $200,000 | $40,000 | $180,000 | $36,000 (limited by 20% of QBI × taxable income) |
| Below threshold | $80,000 | $16,000 | $75,000 | $15,000 (limited by taxable income test) |
Income Thresholds and Phase-Out Ranges (2024)
Below certain income thresholds, virtually all pass-through business owners qualify for the full deduction. Above those thresholds, limitations phase in based on whether the business is a Specified Service Trade or Business (SSTB) and whether sufficient W-2 wages and qualified property exist.
| Filing Status | Full Deduction Below | Phase-Out Begins | Phase-Out Ends |
|---|---|---|---|
| Single / Head of Household | $191,950 | $191,950 | $241,950 |
| Married Filing Jointly | $383,900 | $383,900 | $483,900 |
These thresholds are adjusted annually for inflation. Below the lower threshold, all qualified businesses — including SSTBs — receive the full 20% deduction without W-2 wage limitations. Above the upper threshold, SSTBs receive zero deduction, and non-SSTBs face wage-and-capital limitations.
Specified Service Trade or Business (SSTB) Restrictions
An SSTB is any trade or business whose principal asset is the reputation or skill of its employees or owners, or that falls into specific statutory categories. The SSTB designation eliminates the QBI deduction entirely for high-income filers.
- Health (physicians, dentists, psychologists, nurses)
- Law (attorneys, legal consultants)
- Accounting (CPAs, bookkeepers, enrolled agents)
- Actuarial science
- Performing arts (actors, musicians, directors)
- Consulting (business, management, and financial consulting)
- Athletics (professional athletes, coaches)
- Financial services (investment management, securities, brokerage)
- Not SSTB: Engineering, architecture, real estate agents, insurance agents, direct sales
The W-2 Wage and Capital Limitation
Above the income phase-out range, non-SSTB businesses face an additional limitation: the QBI deduction cannot exceed the greater of (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 all qualified property held at year-end. This limitation rewards businesses that employ workers or hold significant depreciable assets.
- A solo consultant with no employees and no equipment has zero W-2 wages — the deduction is fully eliminated above the threshold if they are also an SSTB
- An S-corporation with $500,000 QBI and $100,000 in W-2 wages can deduct up to $50,000 (50% of $100,000) regardless of the 20% test
- The qualified property prong helps real estate operators with large depreciable building bases
Planning Strategies to Maximize the Deduction
- S-Corp election: S-corporation shareholders who pay themselves reasonable W-2 wages increase the wage base — creating room for the deduction above the threshold
- Multiple businesses: QBI is aggregated across businesses under grouping elections; a profitable SSTB paired with a non-SSTB can sometimes blend the limitation
- Retirement contributions: SEP-IRA, Solo 401(k), or defined benefit plan contributions reduce QBI, which reduces the deduction — but the retirement tax benefit usually outweighs this cost
- Income timing: In a transitional year, keeping taxable income below the threshold preserves the full deduction
This article is for informational purposes only and does not constitute financial or tax advice.
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