CPA REG: Qualified Business Income Deduction (Section 199A)
Master the Section 199A qualified business income deduction for the CPA REG exam, including eligibility, taxable income limitations, SSTB rules, W-2 wage and property limitations.
The QBI Deduction for the CPA REG Exam
The qualified business income (QBI) deduction under IRC Section 199A allows eligible taxpayers to deduct up to 20% of qualified business income from a qualified trade or business operated as a sole proprietorship, partnership, S corporation, or trust/estate. This deduction, introduced by the TCJA and available through 2025, is a significant topic on the REG exam.
Basic Calculation
The QBI deduction equals the lesser of: (1) the combined QBI deduction amount (the sum of the deductible amounts for each qualified business), or (2) 20% of the taxpayer's taxable income minus net capital gains. For each qualified business, the deductible amount is 20% of QBI from that business, subject to limitations based on the taxpayer's taxable income.
Qualified business income includes the net amount of qualified items of income, gain, deduction, and loss from a qualified trade or business. It does not include capital gains or losses, dividends, interest income (unless properly allocable to the business), wage income, income from reasonable compensation from an S corporation, or guaranteed payments from a partnership.
Taxable Income Thresholds
The limitations on the QBI deduction depend on the taxpayer's taxable income relative to threshold amounts that are adjusted annually for inflation. Below the lower threshold, the deduction is simply 20% of QBI with no additional limitation. Above the upper threshold, the W-2 wage and qualified property limitations apply in full, and specified service trades or businesses (SSTBs) receive no deduction. Between the thresholds, the limitations phase in.
The threshold amounts for 2023 were $182,100 for single filers and $364,200 for married filing jointly, with a phase-in range of $50,000 (single) and $100,000 (MFJ) above these amounts.
W-2 Wage and Qualified Property Limitation
For taxpayers above the threshold, the QBI deduction for each business is limited to the greater of: (1) 50% of the W-2 wages paid by the business, or (2) 25% of W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition (UBIA) of qualified property. Qualified property includes depreciable tangible property held at the close of the tax year that is used in the production of QBI, provided the depreciable period has not ended. The depreciable period is the later of 10 years after the property is placed in service or the last day of the last full year in the regular MACRS recovery period.
W-2 wages include all wages subject to federal income tax withholding, plus elective deferrals and deferred compensation. Guaranteed payments to partners and independent contractor payments do not count as W-2 wages. For S corporation shareholders, reasonable compensation is included in W-2 wages.
Specified Service Trades or Businesses (SSTBs)
An SSTB is any trade or business involving the performance of services in the fields of health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, or any business where the principal asset is the reputation or skill of one or more employees or owners. Engineering and architecture are specifically excluded from the SSTB definition.
If the taxpayer's taxable income exceeds the upper threshold, no QBI deduction is allowed for SSTB income. If taxable income falls within the phase-in range, only a portion of the SSTB's QBI, W-2 wages, and UBIA are taken into account, with the includable percentage decreasing as income increases.
Aggregation of Businesses
Taxpayers may elect to aggregate multiple qualified businesses for purposes of the QBI deduction if they meet certain requirements. The businesses must share common ownership (50% or more), and at least two of the following three factors must be present: the businesses provide products or services that are commonly provided together, they share significant centralized business elements, or they are operated in coordination with or reliance on one another. Aggregation allows the W-2 wages and UBIA of all aggregated businesses to be combined, which can increase the overall deduction.
Loss Carryforward Rules
If a qualified business generates a net qualified loss for the year, the loss carries forward and reduces QBI from that business in subsequent years. Additionally, if the combined QBI from all businesses is negative, the total net loss carries forward and reduces the combined QBI amount in the next year. The loss carryforward rules operate separately from the NOL rules and affect only the QBI deduction calculation.
Exam Strategy
- The basic deduction is 20% of QBI, limited to 20% of taxable income minus net capital gains
- Below the threshold, the deduction is straightforward; above it, W-2 wage and UBIA limits apply
- SSTBs get no deduction above the upper threshold
- Engineering and architecture are not SSTBs despite being professional services
- Know the two alternative W-2/UBIA limitation formulas
- QBI excludes capital gains, investment income, reasonable compensation, and guaranteed payments
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