If you run a specified service trade or business (SSTB), your Section 199A qualified business income deduction depends entirely on your taxable income. Below roughly $201,750 for single filers and $403,500 for joint filers in 2026, your SSTB income gets the full 20% deduction. Above roughly $276,750 single and $553,500 joint, the deduction on SSTB income disappears. Between those two figures, it phases out on a sliding scale.
That income test is what makes SSTB status matter. The classification itself is just a label; the tax consequence only kicks in once your taxable income crosses the lower threshold.
Is Your Business an SSTB
Section 199A names specific professional fields whose income is treated as SSTB income: health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, and any business whose principal asset is the reputation or skill of its owners or employees.1Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income Deduction
The label attaches to the type of work, not the size or structure of the business. A solo dentist and a 200-person medical group are both SSTBs because they operate in the health field. A freelance attorney billing $80,000 a year carries the same classification as a large litigation firm.
Treasury regulations spell out what each field covers. Health includes physicians, pharmacists, nurses, dentists, veterinarians, physical therapists, and psychologists providing care in their professional capacity. Financial services covers wealth management, retirement planning, and advisory work. Brokerage services means arranging transactions between buyers and sellers for a commission.2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee
The reputation-or-skill catch-all sounds broad but was narrowed sharply in the final regulations. It applies only to endorsement income, income from licensing your name, image, voice, signature, or trademark, and appearance fees for events or media. A skilled business owner whose company earns money through routine operations does not fall into the catch-all just because customers value the owner’s expertise.
Businesses People Assume Are SSTBs But Aren’t
Architecture and engineering are explicitly carved out of the SSTB definition. Architects and engineers qualify for the full QBI deduction regardless of income. The regulations also confirm architecture and engineering are not treated as consulting for this purpose.2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee
Consulting itself has real boundaries. It means providing advice and counsel. It does not include sales or economically similar services, training and educational courses, or advice bundled into the sale of goods where there’s no separate charge for the counsel. A building contractor who advises clients on design choices as part of a construction project is not consulting. A management consultant billing purely for strategic advice is. Lobbying is included as consulting.
Manufacturing, retail, real estate, construction, restaurants, and most technology companies that sell products rather than professional advice generally sit outside the SSTB category. They can still face the W-2 wage and property limitations at higher income levels, but the SSTB phase-out does not apply.
The Three Income Zones for 2026
Your taxable income before the QBI deduction determines how the deduction is calculated. There are three zones, and the boundaries widened for 2026 under the One Big Beautiful Bill Act.
Below the lower threshold. If your 2026 taxable income is at or below about $201,750 (single) or $403,500 (joint), your SSTB income is treated like ordinary qualified business income. You get the full 20% deduction with no SSTB restriction and no W-2 wage limitation.3Internal Revenue Service. 2025 Instructions for Form 8995-A
Above the upper threshold. If taxable income exceeds about $276,750 (single) or $553,500 (joint), SSTB income produces zero QBI deduction. None of the QBI, W-2 wages, or property basis from the SSTB counts.
Within the phase-out range. The band between the two thresholds is $75,000 for most filers and $150,000 for joint filers in 2026, up from $50,000 and $100,000 in prior years. Inside this band, a shrinking percentage of SSTB income remains eligible.
The IRS has not yet released 2026 form instructions with the final inflation-adjusted figures. The 2025 instructions show the earlier thresholds ($197,300/$394,600 lower and $247,300/$494,600 upper), but the wider $75,000/$150,000 phase-out ranges are already law.
How the Phase-Out Math Works
Inside the phase-out range, the calculation runs in two steps. First, figure out how far your taxable income has moved into the range. Divide the amount by which your taxable income exceeds the lower threshold by the total range ($75,000 single, $150,000 joint). That gives a reduction percentage.
Take a single-filing consultant with $226,750 in taxable income and $150,000 of QBI from her SSTB. She’s $25,000 into the phase-out range. $25,000 divided by $75,000 is about 33%. She multiplies her QBI by the remaining 67%, leaving about $100,500 eligible for the 20% deduction. Her tentative deduction is roughly $20,100, not the $30,000 she’d get below the threshold.
The same reduction percentage also applies to the W-2 wages and property basis from the SSTB. After scaling those down, the result is tested against the standard W-2/UBIA limitation, which is the greater of 50% of W-2 wages or 25% of W-2 wages plus 2.5% of the property’s unadjusted basis. The actual deduction is the lesser of the two calculations.1Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income Deduction This double limitation is where SSTB owners in the phase-out range often lose more than they expect.
One more ceiling applies across all your businesses combined: the total QBI deduction cannot exceed 20% of your taxable income minus net capital gain. Significant investment income can drag the final number below what the business-by-business calculation would produce.4Internal Revenue Service. Qualified Business Income Deduction
The De Minimis Exception for Mixed Businesses
A business that performs some SSTB-type services alongside other activities can avoid the SSTB label entirely if the specified service revenue stays small relative to gross receipts:2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee
- Gross receipts of $25 million or less: 10% or less from specified services keeps the business out of SSTB status
- Gross receipts above $25 million: the threshold drops to 5%
This is all-or-nothing. A landscaping company with $2 million in gross receipts and $180,000 (9%) from landscape-design consulting escapes SSTB classification for the whole business. Push the consulting income to $210,000 (10.5%), and the entire $2 million gets treated as SSTB income, not just the consulting slice. Tracking gross receipts by activity matters, because crossing the line by a small amount taints everything.
The Related-Entity Rental Workaround Doesn’t Work
High-earning professionals have tried splitting a practice into two entities, one holding the operating business and another holding the office building, then routing rent between them to convert SSTB income into rental income eligible for the full deduction. The final regulations shut this down.
When a business provides property or services to an SSTB and there is 50% or more common ownership between them, the portion of income from those related-party transactions is treated as SSTB income.2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee There’s no minimum threshold; any amount of property or services triggers the rule for the related-party portion.
If a group of attorneys owns both the law firm and its building through separate LLCs, the rent the firm pays the building entity is SSTB income and phases out the same way. Rent the building entity collects from unrelated tenants is not affected.
What Changed for 2026
The QBI deduction was scheduled to expire after December 31, 2025. The One Big Beautiful Bill Act, signed July 4, 2025, made three changes effective for tax years beginning after December 31, 2025:
- Section 199A is now permanent, not a scheduled sunset provision
- The phase-out range widened from $50,000 to $75,000 for most filers, and from $100,000 to $150,000 for joint filers, so the deduction disappears more gradually
- A minimum deduction of $400 applies to taxpayers with at least $1,000 of QBI from a business in which they materially participate, with inflation adjustments after 2026
The 20% rate stayed the same, the SSTB classification rules were not changed, and the W-2 wage and property basis limitations remain. For SSTB owners, the wider phase-out range is the meaningful change.
Which Form to File
If your 2026 taxable income sits at or below the lower threshold and you’re not a patron of an agricultural cooperative, file Form 8995, a single-page computation.5Internal Revenue Service. Instructions for Form 8995 (2025)
Above the lower threshold, use Form 8995-A. SSTB owners inside the phase-out range also complete Schedule A of Form 8995-A, which handles the applicable-percentage calculation for SSTB income.3Internal Revenue Service. 2025 Instructions for Form 8995-A Above the upper threshold, the SSTB doesn’t appear on the form at all, because there’s no deduction left to compute.