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A Guide to the Business Pass-Through Deduction

Written by Kohari Gonzalez Oneyear & Brown | Oct 3, 2025 6:00:00 AM

Article Highlights:

  • 1. Basic Overview of the Section 199A Deduction
  • Definition of Qualified Business Income (QBI)
  • Origins of the Section 199A Deduction
  • 2. Distinction Between Qualified Trades or Businesses (QTB) and Specified Service Trades or Businesses (SSTB)
  • Qualified Trades or Businesses (QTB):
  • Specified Service Trades or Businesses (SSTB):
  • Congressional Intent for the Distinction
  • 3. Calculation Details and Income Thresholds
  •  Impact of Modified Adjusted Gross Income (MAGI):
  • Wage Impact on QTB Deduction

The Section 199A pass-through deduction, commonly known as the Qualified Business Income (QBI) deduction, provides substantial tax breaks to qualifying business owners.  This deduction allows certain persons to deduct up to 20% of their eligible business income from domestic firms organized as a sole proprietorship, partnership, S corporation, trust, or estate.  Understanding the complexities of the Section 199A deduction might be challenging, but it is critical for appropriate tax planning and compliance.

Basic Overview of the Section 199A Deduction

  • Definition of Qualified Business Income (QBI):  Qualified Business Income is defined as the net amount of qualified items of income, gain, deduction, and loss from any eligible trade or business.  It specifically excludes investment income, including capital gains, dividends, and non-business interest income.
  • Origins of Section 199A Deduction:  The deduction, which was enacted as part of the Tax Cuts and Jobs Act (TCJA) in 2017, was designed to provide tax relief to firms that do not benefit from the TCJA's lower corporation tax rate.  Originally set to expire at the end of 2025, the One Big Beautiful Bill Act (OBBBA) made the deduction permanent and expanded its benefits.

Distinction Between Qualified Trades or Businesses (QTB) and Specified Service Trades or Businesses (SSTB)

  • Qualified Trades or Businesses (QTB): If a business meets wage or property standards, its proprietors are eligible for the full 20% deduction with no income phaseout.  QTBs are commonly found in manufacturing, retail, and non-service enterprises.
  • Specified Service Trades or Businesses (SSTBs): SSTBs include health care, law, accounting, actuarial science, performing arts, consultancy, athletics, financial services, and brokerage.  Professionals in these industries may face phaseouts of the deduction if their income exceeds certain levels.
  • Congress's Intent for the Distinction:  Historically, service businesses have been regarded differently from manufacturing under various tax regimes.  This distinction in Section 199A aids in the targeting of industrial and non-service businesses for economic growth incentives.

Calculation Details and Income Thresholds

  • Impact of Taxable Income: An individual's taxable income has a direct impact on whether the SSTB deduction is available.  If a taxpayer's taxable income surpasses specific thresholds, the deduction is gradually phased away, eventually being unavailable at the high end.  The OBBBA raised these thresholds, allowing more SSTB owners to qualify.
  • Wage Impact on QTB Deduction: The deduction may be limited by the wages paid by the firm.  For QTBs, the deduction is the lesser of 20% of QBI or a combination of 50% of wages paid or 25% of wages plus 2.5% of the unadjusted basis of the company's eligible property.

Changes and Updates Under the OBBBA

  • New Minimum Deduction Effective in 2026: Beginning in 2026, a minimum deduction is implemented to ensure that small business owners receive a baseline deduction regardless of wage or phaseout constraints.  This innovation intends to make tax planning easier for smaller QTBs and SSTBs with lower income or wage bases.  The minimum deduction is $400 for taxpayers with at least $1,000 in QBI from one or more active trades or companies in which they materially engage, and it will be modified for inflation in subsequent years.

The Section 199A pass-through deduction is an important tax planning tool for business owners, balancing incentives across industries and boosting economic activity.  It is also a very intricate deduction, and tax professionals play an important role in negotiating these complexities to assure compliance and benefit optimization.  Please contact this office if you have any queries or need assistance.