15.4 Qualified Business Income Deduction §199A

15.4 Qualified Business Income Deduction §199A

REG Blueprint Area IV, Group C asks you to calculate the qualified business income (QBI) deduction for federal income tax purposes. IRC §199A is a deduction in computing taxable income. It is not an adjustment to AGI, not an itemized deduction, and not a credit. Itemizers and standard-deduction filers both may claim it. C corporations cannot. Individuals, estates, and trusts can. The computation uses Form 8995 or Form 8995-A after AGI and after the greater of the standard or itemized deduction have already been determined in 15.2 and 15.3.

The One Big Beautiful Bill Act made §199A permanent. It had been scheduled to expire after 2025. OBBBA also widened the phase-in range above the taxable-income threshold and added a minimum deduction discussed below. The 20% rate did not change.

What is QBI — and what is not

Qualified business income is the net amount of qualified items of income, gain, deduction, and loss from a domestic qualified trade or business. For an individual that usually means Schedule C profit, the owner's share of partnership or S corporation ordinary (and certain separately stated) items from a trade or business, and rental income when the rental rises to a §162 trade or business. QBI information arrives on the K-1 as a statement, not as extra Schedule E income (15.1).

Not QBI:

• W-2 wages earned as an employee (the employee's own salary is never QBI)
• Reasonable compensation paid to an S corporation shareholder-employee
• Guaranteed payments to a partner for services
• Capital gains and losses, dividends, and interest not properly allocable to the business
• Foreign (non-U.S.) business income

Those exclusions matter on TBS items that mix a partner's guaranteed payment with Box 1 ordinary income. Only the QBI-eligible slice enters the 20% computation.

The two components and the overall limit

The deduction has two components that are then capped:

1. QBI component: 20% of QBI (after combining QBI from all qualified trades or businesses, and after netting a current QBI loss against current QBI)
2. REIT/PTP component: 20% of qualified REIT dividends plus qualified publicly traded partnership (PTP) income

Overall limitation: the sum of those components cannot exceed 20% of (taxable income computed without the QBI deduction − net capital gain). For this purpose, net capital gain includes qualified dividends that are taxed as net capital gain. The overall limit is why a taxpayer with large QBI and a large long-term capital gain can see the deduction shrink: capital gain inflates taxable income but is removed again in the limiter.

Write it once and reuse it:

§199A deduction = lesser of [20% × QBI + 20% × (REIT + PTP)] or [20% × (TI before QBI − net capital gain)].

Below the threshold: no wage test, SSTB fully in

Section 199A uses a taxable-income threshold that is inflation-indexed. REG will not require you to recite this year's single or joint dollar. Below that threshold:

• The W-2 wage and UBIA limitation does not apply. A capital-intensive or zero-wage business still gets 20% of QBI (subject only to the overall TI − NCG limit).
• A specified service trade or business (SSTB) is fully eligible. A solo accountant under the threshold is not disqualified merely because accounting is an SSTB.

Above the threshold: wage/UBIA mechanics and SSTB phaseout

Once taxable income exceeds the threshold, two additional machines turn on. They phase in over a statutory range (OBBBA widened that range; the range is indexed). Teach the mechanics, not the threshold dollars.

Wage and UBIA limitation (non-SSTB, fully phased in). The QBI component from that trade or business is limited to the greater of:

• 50% of the W-2 wages paid by the business, or
• 25% of the W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition (UBIA) of qualified property

Qualified property is depreciable tangible property held and used in the business at year-end, still within its depreciable period for this test. UBIA is generally cost on the placed-in-service date, not remaining tax basis after MACRS. A service firm that pays no W-2 wages and owns no depreciable property can see the QBI component go to zero once the taxpayer is fully above the range. A firm with large payroll, or with a building that still has UBIA life, keeps a deduction.

SSTB phaseout. An SSTB is a trade or business involving the performance of services in health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, or brokerage services; investing, investment management, trading, or dealing in securities; or any trade or business whose principal asset is the reputation or skill of one or more employees or owners. Architecture and engineering are expressly not SSTBs. Below the threshold, SSTB QBI is eligible. Over the phase-in range, SSTB QBI, wages, and UBIA are reduced. Fully above the range, SSTB QBI is zero and the SSTB produces no §199A deduction (the REIT/PTP component is a separate bucket).

OBBBA minimum deduction — §199A(i)

Beginning in 2026, a taxpayer who materially participates (within the meaning of §469(h)) in one or more qualified trades or businesses and who has at least $1,000 of QBI from those active businesses is allowed a minimum QBI deduction of $400 if the regular computation would be smaller. The $400 and $1,000 figures are statutory starting amounts and are indexed after 2026. IRS explanations of the OBBBA business provisions describe this as a de minimis floor for active small owners. It does not let a C corporation in, and it does not revive SSTB QBI that has already been fully phased out for a high-income specified-service owner.

Worked scenario: $100,000 of QBI, overall limit binds

Facts. Jordan is a calendar-year individual below the §199A taxable-income threshold. QBI from a domestic non-SSTB sole proprietorship is $100,000. Jordan has no REIT dividends and no PTP income. Taxable income computed without the QBI deduction, minus net capital gain, is $90,000. W-2 wages of the business are $0.

Analysis.

1. Tentative QBI component. 20% × $100,000 = $20,000. REIT/PTP component = $0. Tentative deduction = $20,000.
2. Wage/UBIA. Taxable income is below the indexed threshold, so the 50% / 25%+2.5% test does not apply. Zero W-2 wages do not kill the deduction.
3. Overall limit. 20% × $90,000 = $18,000.
4. Allowed deduction. Lesser of $20,000 and $18,000 = $18,000, not $20,000.

If Jordan's taxable income minus net capital gain had been $120,000, the overall limit would have been $24,000 and the deduction would have been $20,000. If Jordan were fully above the threshold with $0 of W-2 wages and $0 of UBIA, the wage/UBIA test would have limited the QBI component to $0 even though 20% of QBI is $20,000. If the business were an SSTB and Jordan were fully above the range, QBI from that business would be $0 for §199A.

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