What Is SSTB on a Tax Return? QBI Thresholds and Rules

SSTB stands for Specified Service Trade or Business. It’s an IRS classification that appears on the forms used to calculate the 20% qualified business income (QBI) deduction under Section 199A, and it flags your business as one whose deduction can shrink or disappear entirely once your taxable income crosses certain thresholds.1Internal Revenue Service. Qualified Business Income Deduction If you own a pass-through business in a professional field like health care, law, or financial advising, this single label can determine whether you get a substantial tax break or none at all.

Why the SSTB Label Matters

Section 199A lets owners of sole proprietorships, partnerships, S corporations, and certain trusts and estates deduct up to 20% of qualified business income from taxable income. Non-SSTB businesses face limits at high incomes based on wages paid and property held, but they never lose the deduction outright. SSTB owners can. Once your taxable income exceeds the upper threshold, none of your SSTB income counts toward the deduction.

Below the lower threshold, the label is harmless. You get the full 20% deduction whether your business is an SSTB or not. The classification only bites in the phase-out range and above.

Which Businesses Count as an SSTB

The regulations list specific professional fields that automatically carry the SSTB designation, regardless of how the business is structured:2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee

  • Health: physicians, pharmacists, nurses, dentists, veterinarians, physical therapists, psychologists, and similar practitioners treating patients.
  • Law: lawyers, paralegals, arbitrators, mediators, and related professionals.
  • Accounting: accountants, enrolled agents, tax return preparers, and auditors.
  • Actuarial science.
  • Performing arts: actors, singers, musicians, entertainers, and directors.
  • Consulting: professionals who provide advice and counsel, but not businesses that sell or implement goods alongside their advice.
  • Athletics: athletes, coaches, and team managers in professional sports.
  • Financial services: financial advisors, investment bankers, wealth planners, retirement advisors.
  • Brokerage services: stockbrokers and similar professionals.
  • Investing, investment management, and trading or dealing in securities or commodities.

The classification follows the nature of the work, not the industry served. A dentist’s practice is an SSTB; a company that manufactures dental equipment is not. A financial advisory firm qualifies; a software company that builds tools for financial advisors does not.

Engineering and Architecture Are Not SSTBs

Engineering and architecture firms are commonly assumed to fall in with law and accounting. They don’t. Section 199A explicitly instructs the IRS to apply the professional service list “without regard to the words ‘engineering, architecture.'”3Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income Firms in these two fields can claim the full QBI deduction at any income level, subject only to the wage-and-property limits that apply to any non-SSTB business.

The Reputation or Skill Catch-All

Beyond the listed fields, the regulations include a catch-all for businesses whose principal asset is the reputation or skill of one or more owners or employees. The final regulations narrowed this to three specific income streams:2eCFR. 26 CFR 1.199A-5 – Specified Service Trades or Businesses and the Trade or Business of Performing Services as an Employee

  • Endorsement income: fees for endorsing products or services.
  • Licensing personal identity: income from licensing your image, likeness, name, signature, voice, or similar symbols.
  • Appearance fees: compensation for appearing at events or on radio, television, or other media.

A restaurant owner whose business thrives on personal reputation doesn’t trigger this category. Neither does a popular contractor known by name. The rule targets income flowing directly from celebrity or personal identity rather than from performing a service or selling a product. Social media influencers earning endorsement or licensing fees are a common example.

Income Thresholds That Decide Whether SSTB Status Costs You

The thresholds adjust each year for inflation, and the One Big Beautiful Bill Act widened the phase-out ranges starting in 2026. Approximate 2026 figures:

  • Lower threshold (full deduction still available): roughly $201,750 for single filers and $403,500 for married filing jointly.
  • Phase-out range: $75,000 above the lower threshold for single filers and $150,000 for joint filers, expanded from $50,000 and $100,000 under prior law.
  • Upper threshold (no deduction for SSTB income): roughly $276,750 single and $553,500 joint.

For comparison, the 2025 thresholds were $197,300 and $394,600.4Internal Revenue Service. Instructions for Form 8995-A (2025) Between the lower and upper thresholds, only a shrinking percentage of SSTB income counts as qualified business income. Above the upper threshold, SSTB income is out entirely. The IRS publishes final figures in an annual revenue procedure, so verify the exact numbers in the Form 8995 or 8995-A instructions when you file.

Mixed Businesses and the De Minimis Rule

Some businesses blend service work with other revenue. The IRS uses a de minimis rule so that minor service activity doesn’t drag an entire company into SSTB territory:5GovInfo. 26 CFR 1.199A-5

  • Gross receipts of $25 million or less: not an SSTB if less than 10% of gross receipts come from SSTB-type services.
  • Gross receipts over $25 million: the threshold drops to 5%.

If SSTB revenue exceeds the applicable percentage, the entire business is treated as an SSTB, not just the service piece. Any activity related to performing the service counts toward the percentage, including administrative support for that service line.

One related point: the SSTB designation applies per business activity, not per entity. If a single LLC runs a consulting operation and a separate product line, the consulting activity is an SSTB and the product sales are not. Each is reported separately.

Where SSTB Status Appears on Your Return

The classification shows up on the forms that calculate the QBI deduction. Which form you use depends on your income:

  • Form 8995, Simplified Computation, is for taxpayers whose taxable income is at or below the lower threshold. Below the threshold, SSTB status is irrelevant to the calculation.4Internal Revenue Service. Instructions for Form 8995-A (2025)
  • Form 8995-A, Standard Computation, is required once taxable income exceeds the lower threshold. It handles the wage-and-property limits and the SSTB phase-out.
  • Schedule A of Form 8995-A is the specific schedule for Specified Service Trades or Businesses. If your income falls in the phase-out range and you have SSTB income, this schedule calculates the reduced percentage of QBI, wages, and property basis that still count.6Internal Revenue Service. Instructions for Form 8995-A

Tax software typically asks whether each business activity is an SSTB and routes you accordingly. If you work with a preparer, the SSTB question should come up early for any pass-through business you own. Claiming the deduction when you shouldn’t creates an underpayment; skipping it when you’re eligible means overpaying.