Section 199A QBI Deduction: EA Exam Part 2 (2026)

The Section 199A qualified business income (QBI) deduction lets eligible taxpayers deduct up to 20% of their net income from a pass-through business, subject to limits that depend on taxable income, W-2 wages, and business type. It is claimed on the individual return, reduces taxable income (not AGI), and became permanent under the One Big Beautiful Bill Act of 2025.

Part 2 of the Special Enrollment Examination (SEE) tests the QBI deduction from several angles: who qualifies, how the threshold limits work, and what happens when a specified service business crosses the income line. This guide from VantageEA, an Enrolled Agent (EA) exam practice platform, covers the calculation, the W-2 and UBIA limits, SSTB rules, and the traps that cost points.

What is the Section 199A qualified business income deduction?

Congress added Section 199A in the Tax Cuts and Jobs Act of 2017 to give pass-through business owners a benefit comparable to the reduced corporate tax rate. The deduction equals up to 20% of qualified business income from a qualified trade or business operated as a sole proprietorship, partnership, S corporation, or through certain trusts and estates. The IRS qualified business income deduction overview summarizes the provision.

Three features matter for the exam:

• Below the line: the deduction appears on Form 1040 after adjusted gross income and reduces taxable income, but it does not reduce self-employment tax or AGI.
• Not itemized: taxpayers claim it whether they take the standard deduction or itemize.
• Permanent: Section 199A was due to expire after 2025, and the One Big Beautiful Bill Act of 2025 removed that sunset. For tax years beginning after 2025 the Act also widens the phase-in ranges and adds a $400 minimum deduction. The current EA exam window tests law in effect through December 31, 2025, so the figures in this guide are the 2025 ones.

The deduction is reported on Form 8995 (simplified version for taxpayers below the income threshold) or Form 8995-A (for those above the threshold, with multiple businesses, or who aggregate). The Instructions for Form 8995 walk through both paths.

Which businesses generate qualified business income?

Qualified business income is the net amount of qualified items of income, gain, deduction, and loss from a qualified trade or business. A qualified trade or business is any trade or business under Section 162 except for the business of being an employee. That means:

• Sole proprietorships reporting on Schedule C (see the sole proprietorship and Schedule C topic)
• Partnerships and LLCs taxed as partnerships passing income through on Schedule K-1
• S corporations passing income through on Schedule K-1 (see the S corporation income and distributions topic)
• Rental real estate activities that rise to a trade or business (the IRS safe harbor requires 250 or more hours of rental services per year)

C corporation dividends do not qualify, because that income is taxed at the corporate level. Investment income such as capital gains, dividends, and interest not allocable to a business is excluded from QBI. Reasonable compensation paid by an S corporation to its shareholder-employee is also excluded, because the deduction is aimed at business profit.

How do you calculate the basic 20% QBI deduction?

For a taxpayer whose taxable income before the QBI deduction is at or below the threshold, the calculation is straightforward. The deduction equals the lesser of:

1. 20% of QBI from all qualified businesses combined, or
2. 20% of taxable income minus net capital gain (net long-term capital gain plus qualified dividends).

Suppose a single taxpayer has $140,000 of taxable income before the QBI deduction, including $90,000 of Schedule C net profit and $50,000 of wages from an employer. QBI is $90,000. The tentative deduction is 20% of $90,000, or $18,000. Taxable income minus net capital gain (assume zero) is $140,000. The deduction is the smaller number: $18,000. No W-2 wage or UBIA limit applies because taxable income is below the threshold.

The second cap rarely bites in practice, but it prevents the deduction from exceeding the taxpayer's total income. It appears on the exam when capital gains make up a large share of income.

What are the 2025 taxable income thresholds?

The limitations kick in once taxable income before the QBI deduction exceeds $197,300 for single and head of household filers, or $394,600 for married filing jointly, per the 2025 inflation adjustments published by the IRS. Above those amounts, two limits phase in over a range of $50,000 (single/HOH) or $100,000 (MFJ):

Below the threshold, the full 20% deduction applies with no further limits. In the phase-in range, the W-2 wage and UBIA limit (and the SSTB exclusion) phase in. Above the top of the range, those limits apply in full. The thresholds adjust for inflation each year. The phase-in ranges are $50,000 and $100,000 for 2025, and they widen to $75,000 and $150,000 for tax years beginning after 2025.

How do the W-2 wage and UBIA limits work?

Once taxable income is above the threshold (fully above, or in the phase-in range on a partial basis), the deduction for each business cannot exceed the greater of:

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

Qualified property is tangible, depreciable property used in the business whose depreciable period has not ended. The depreciable period is the longer of the recovery period under Section 168 or 10 years from the date placed in service.

Here is the key difference. A consulting firm with $400,000 of QBI, $300,000 of W-2 wages, and no depreciable property computes:

• 20% of QBI: $80,000.
• 50% of W-2 wages: $150,000.
• 25% of W-2 wages + 2.5% of UBIA: $75,000 + $0 = $75,000.
• Greater of the two wage limits: $150,000.
• Deduction: the lesser of $80,000 and $150,000, so $80,000.

The W-2 limit is irrelevant when 50% of wages already exceeds 20% of QBI. It bites hardest for a solo owner with no employees and no depreciable property, because both wage amounts are zero and the capped deduction is zero. A landlord with a large building (high UBIA) but no employees benefits from the second formula. Wages reported on Form W-2, including elective deferrals, count; guaranteed payments to partners do not.

What is a specified service trade or business?

A specified service trade or business (SSTB) is treated differently once the owner's taxable income enters the phase-in range. Above the top of the range, the QBI deduction for an SSTB is zero. The SSTB fields are listed in the Instructions for Form 8995:

• Health: physicians, dentists, nurses, pharmacists, and similar health care professionals.
• Law: attorneys and legal services.
• Accounting: CPAs, enrolled agents, bookkeepers.
• Actuarial science, performing arts, consulting, athletics.
• Financial services and brokerage services.
• Any trade or business where the principal asset is the reputation or skill of one or more employees or owners.

Engineering and architecture are specifically excluded from SSTB status, even though they are professional services. That exception comes up on the exam. An engineering firm owner with $500,000 of taxable income faces only the W-2 and UBIA limits; the SSTB exclusion does not apply.

Below the income threshold, SSTB status does not matter at all. A tax preparer (SSTB, accounting) with taxable income of $120,000 gets the full 20% deduction with no limitation.

How does the QBI deduction work with multiple businesses?

Each qualified business is computed separately. A taxpayer with a Schedule C freelance design business ($60,000 QBI) and a 40% share of an S corporation ($100,000 QBI on the K-1) computes the tentative deduction for each, applies any W-2 and UBIA limit to each, and then combines them. The total cannot exceed 20% of taxable income minus net capital gain.

If one business has a net QBI loss, that loss offsets positive QBI from other businesses in the same year. Any remaining net QBI loss carries forward to the next tax year and reduces QBI in that year, proportionally among the businesses with positive QBI. The carryforward reduces QBI dollar for dollar before the 20% is applied.

Taxpayers can also aggregate commonly controlled businesses under Treasury Regulation section 1.199A-4 to pool their W-2 wages and UBIA across entities, which helps when one entity has wages and another has property. Aggregation is an election, reported on Form 8995-A, and once made it must be consistent in later years.

Which Section 199A traps cost the most points on Part 2?

Part 2 (Businesses) had a pass rate of 71% in the 2024-2025 testing year, according to figures compiled from Prometric score data (the IRS does not publish official pass rates). These QBI errors appear often:

• Treating S corporation wages as QBI: reasonable compensation paid to a shareholder-employee is not QBI. Only the remaining pass-through profit qualifies.
• Forgetting the taxable income cap: the deduction cannot exceed 20% of taxable income minus net capital gain, even when 20% of QBI is higher.
• Assuming SSTB always kills the deduction: below the threshold, SSTB status is irrelevant. A high-income dentist gets nothing, but a dentist below $197,300 (single) gets the full 20%.
• Mixing up engineering and accounting: engineering is not an SSTB, but accounting is. Both are professional services, yet only accounting faces the exclusion.
• Using guaranteed payments as QBI: a partner's guaranteed payment for services is not QBI. The partner's share of the remaining partnership ordinary income is.

Try this one. A married-filing-jointly taxpayer has $500,000 of taxable income before the QBI deduction, a Schedule C business with $200,000 of QBI that is not an SSTB, $120,000 of W-2 wages in that business, and $800,000 of UBIA in equipment. Because taxable income ($500,000) exceeds the $494,600 full-limitation threshold, the W-2/UBIA limit applies in full:

• 50% of wages: $60,000.
• 25% of wages + 2.5% of UBIA: $30,000 + $20,000 = $50,000.
• Greater of the two: $60,000.
• 20% of QBI: $40,000.
• Deduction: lesser of $40,000 and $60,000, or $40,000.

The limit did not reduce the deduction here because 20% of QBI was already below the wage cap. Read more about how difficult each EA exam part is and the EA Part 2 business taxation exam overview.

How should you study the QBI deduction for the 2026 EA exam?

Each part of the SEE has 100 questions (85 scored and 15 experimental) in 3.5 hours, and you need a scaled score of 500 on the 200 to 800 scale to pass. According to the IRS Enrolled Agents FAQ, the US window runs July 1, 2026 to February 28, 2027 at PSI test centers or through PSI online proctoring, and the fee is $317 per part.

1. Start below the threshold: learn the simple 20% calculation first, then layer on the W-2/UBIA limits for high-income scenarios.
2. Memorize the SSTB list: health, law, accounting, actuarial, performing arts, consulting, athletics, financial, brokerage. Remember the engineering and architecture exception.
3. Practice the two-formula wage limit: 50% of W-2, or 25% of W-2 plus 2.5% of UBIA. Pick the greater, then compare to 20% of QBI.
4. Know what is not QBI: S corporation wages, guaranteed payments, capital gains, investment interest, and employee income.

The EA exam numbers to memorize for 2026 guide includes the QBI thresholds alongside other Part 2 figures, and the week-by-week EA exam study schedule places Section 199A in its Part 2 block. The QBI deduction topic page links to the primary IRS sources. VantageEA EA mock tests report your number correct out of 100, with 70 correct as the pass mark, plus an estimated PSI score range. Start with a free EA practice test.

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