The QBI Deduction: 20% Off Business Income, With Fine Print

By Tom, CPA · Updated October 27, 2026

Part of: Tax Planning

TL;DR: Section 199A lets owners of pass-through businesses deduct up to 20% of qualified business income, now permanent. Below $201,750 (single) or $403,500 (joint) of 2026 taxable income it is simple; above that, SSTB and wage limits phase in.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

The tax code is 4 million words long; you need about 400 of them to understand the qualified business income deduction, and Congress hid those 400 inside Section 199A like a toddler hiding a cookie in the DVD player. The short version: if you run a business that is not a C corporation, you may be able to deduct up to 20% of the profit, without spending a dime to earn it. No receipt. No mileage log. Just a form (8995 or 8995-A) and a calculation that ranges from "trivially easy" to "why does this worksheet have a worksheet."

Originally the deduction was scheduled to vanish after 2025. The 2025 tax law (often called OBBBA, and branded by the IRS as the Working Families Tax Cuts) made it permanent, so as of Oct 2026 it is part of the long-term furniture. This pillar guide covers what counts as QBI, the 2026 income thresholds from Rev. Proc. 2025-32, the specified service trade or business (SSTB) trap, the W-2 wage and property limits, planning moves that actually work, and several worked illustrations. Figures are for tax year 2026, as of Oct 2026. The 2027 thresholds had not been published by the IRS when this was written; check irs.gov before planning 2027.

CPA Warning Label: QBI math above the threshold involves wages, property basis, aggregation elections and loss carryforwards. Model it with your actual return before changing salary or entity structure.

What qualifies as qualified business income

Qualified business income is the net income, gain, deduction and loss from a qualified trade or business operated directly or through a pass-through entity. In plain English: profit from a sole proprietorship (Schedule C), a single-member LLC taxed as a sole prop, a partnership, an S corporation, many rental real estate activities that rise to the level of a trade or business, and certain farming operations.

What counts

• Schedule C profit from freelancing, consulting, gig work and small businesses, after ordinary business expenses.
• Partnership and S corporation income passed through on a Schedule K-1, generally reported in the 199A section of the K-1.
• Rental income when the rental is a trade or business under Section 162, or when it meets the IRS safe harbor for rental real estate (the 250-hour test covered in our QBI rental safe harbor guide).
• Qualified REIT dividends and publicly traded partnership income, which get their own 20% component and are not subject to the wage limits.

What does not count

• W-2 wages you earn as an employee. Your day job is not a business, no matter how much it feels like you run the place.
• Reasonable compensation paid to you by your own S corporation. The salary is wages; only the remaining profit is QBI.
• Guaranteed payments to a partner for services.
• Investment income such as capital gains, most interest and ordinary dividends (other than qualified REIT dividends).
• C corporation income. C corps got their own rate cut in 2017 and are not invited to this party.

QBI is also reduced by deductions attributable to the business that appear elsewhere on your return: the deductible half of self-employment tax, the self-employed health insurance deduction, and contributions to self-employed retirement plans. That catches a lot of people. Your Schedule C might say $100,000, but your QBI could be closer to $85,000 after those items.

How the 20% deduction is calculated

For taxpayers below the threshold, the math is two lines long. The deduction is the smaller of:

1. 20% of qualified business income (plus 20% of qualified REIT dividends and PTP income), or
2. 20% of taxable income before the QBI deduction, minus net capital gain (which includes qualified dividends).

That second cap is the one people forget. If your taxable income is low because the standard deduction ate most of it, or if a big chunk of your income is long-term capital gains, the taxable income limit can shrink the deduction below 20% of QBI.

The QBI deduction is taken after AGI. It reduces taxable income, but it does not reduce adjusted gross income. That matters because AGI and its cousin MAGI drive ACA premium credits, IRMAA, and many phaseouts, so a QBI deduction will not help you there. Our AGI vs MAGI guide explains why. It also does not reduce self-employment tax.

The deduction is available whether you itemize or take the standard deduction. You claim it on Form 8995 if your taxable income is at or below the threshold, and Form 8995-A if you are above it or have patrons of agricultural cooperatives.

The 2026 thresholds

Below the threshold, the W-2 wage limits and SSTB rules do not apply at all. Above it, they phase in across a range. For 2026, per Rev. Proc. 2025-32:

The 2025 law widened the phase-in range from $50,000 to $75,000 (single) and from $100,000 to $150,000 (joint), which is why the top of the range sits $75,000 or $150,000 above the threshold. It also added a minimum deduction of $400 for taxpayers with at least $1,000 of QBI from businesses in which they materially participate, per Rev. Proc. 2025-32.

Notice that the test uses taxable income, not AGI and not business profit. A married couple with $480,000 of Schedule C profit could land under the $403,500 threshold after retirement contributions, half of SE tax, health insurance and the standard deduction. Every dollar of above-the-line deduction pulls you further from the phase-in.

The SSTB rules: when your profession is the problem

A specified service trade or business is one involving health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, investing and investment management, trading, dealing in securities, or any business where the principal asset is the reputation or skill of its employees or owners. The "reputation or skill" clause sounds like it covers every human with a job, but the regulations narrowed it to income from endorsements, licensing your name or likeness, and appearance fees.

Engineering and architecture are specifically excluded from the SSTB list. So is real estate brokerage, which the regulations do not treat as brokerage services. A plumber, a software developer building products, a bakery, a landscaper and a rental landlord are generally not SSTBs.

The consequence:

• Below the threshold: SSTB status does not matter. The doctor with $150,000 of taxable income gets the same 20% as the baker.
• Inside the phase-in range: only a shrinking percentage of the SSTB's QBI, wages and property counts.
• Above the top of the range: SSTB income produces no QBI deduction at all.

There is also a de minimis rule. If gross receipts are $25 million or less and under 10% of receipts come from SSTB activity, the business is not an SSTB. Above $25 million the cutoff is 5%. Splitting an SSTB into a "service company" and a "non-service company" that sells to it does not work when there is 50% or more common ownership; the regulations treat the related piece as part of the SSTB.

The W-2 wage and UBIA limits

Above the threshold, a non-SSTB business's deduction is limited to the greater of:

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

UBIA is generally the original cost of depreciable tangible property still within its depreciable period, or 10 years from placement in service if later. Land does not count. A rental building bought for $800,000, including $200,000 of land, has $600,000 of UBIA, and 2.5% of that is $15,000.

Inside the phase-in range, the limit applies proportionally. If you are 40% through the range, you lose 40% of the difference between the full 20% deduction and the wage-limited amount.

Sole proprietors with no employees often have zero W-2 wages. Above the range, that means zero deduction unless the business owns qualifying property. That is one reason some high earners look at an S corporation election: the owner's own salary is W-2 wages that can support the deduction. It is also a reason not to set salary purely to dodge payroll tax, because the two goals pull against each other. See our S corp reasonable salary guide.

Rental real estate and QBI

Rental income only qualifies if the rental is a trade or business. Courts look at regularity, continuity and profit motive. A single triple-net lease where the tenant pays everything and you do nothing often fails that test; our triple-net lease QBI guide covers why.

The IRS safe harbor in Rev. Proc. 2019-38 lets a rental enterprise be treated as a trade or business if, among other things, separate books are kept and at least 250 hours of rental services are performed per year (for enterprises in existence less than four years; a three-of-five-year test applies after that), with contemporaneous time records. Triple-net leases and property you use personally for more than the greater of 14 days or 10% of rental days are excluded from the safe harbor.

Failing the safe harbor does not automatically disqualify you; it just means you argue the Section 162 facts on your own. Rental losses also count as negative QBI and carry forward to reduce future QBI, which surprises landlords whose rentals show paper losses from depreciation.

Planning moves that actually work

1. Manage taxable income around the threshold

For an SSTB owner sitting near $201,750 (single) or $403,500 (joint) of taxable income, every dollar of above-the-line deduction can be worth the marginal rate plus a recovered piece of QBI deduction. Solo 401(k) or SEP contributions, HSA contributions and timing of expenses are the usual levers. A deductible retirement contribution reduces QBI too, but the net effect often favors contributing when it keeps you below the phase-in.

2. Pay W-2 wages deliberately

Above the range, a non-SSTB business with no wages gets nothing. Hiring employees or paying an S corp salary creates the wage base. Wages also cost payroll tax and reduce QBI, so model it rather than assuming more salary is better.

3. Aggregate eligible businesses

Owners of multiple non-SSTB businesses with common ownership of 50% or more can elect to aggregate them, pooling wages and UBIA. A business with profit but no wages can borrow the wage base of a sibling business that has wages but little profit. Aggregation, once elected, is generally binding in future years, and the election must be disclosed on the return.

4. Mind the capital gain cap

If most of your taxable income is long-term gains or qualified dividends, the 20%-of-taxable-income-minus-net-capital-gain cap can bite. Harvesting gains in a year with large QBI can reduce the deduction. Run the numbers both ways.

5. Do not chase the deduction with bad business decisions

The QBI deduction is worth up to 20% of profit times your marginal rate. At a 24% bracket, that is about 4.8 cents per dollar of profit. Spending a dollar to "get the deduction" still leaves you about 76 cents poorer before other effects. The deduction rewards profit; it does not refund spending.

Illustrations

Illustration 1: freelancer below the threshold. Priya is single and has $90,000 of Schedule C profit in 2026 and no other income. Half of her SE tax is about $6,359 (see our self-employment tax guide for the math). Her QBI is $90,000 minus $6,359, or about $83,641. Her AGI is about $83,641, and after the $16,100 standard deduction her taxable income before QBI is about $67,541. The deduction is the smaller of 20% of QBI ($16,728) or 20% of taxable income ($13,508). The taxable income cap wins: her deduction is about $13,508. That saves roughly $2,970 at her 22% bracket, rounding aside.

Illustration 2: consultant above the range. Marcus is a single management consultant (an SSTB) with $320,000 of taxable income before the QBI deduction. He is above $276,750, the top of the 2026 phase-in for single filers. His QBI deduction is zero. If he could bring taxable income down to $201,750 or below, the full 20% would return, but $118,250 of extra deductions is not realistic with retirement contributions alone. He should focus on other strategies.

Illustration 3: landlord with property but no wages. A married couple has $500,000 of taxable income before QBI and $100,000 of QBI from a rental enterprise that is a trade or business with no employees. UBIA of the buildings is $1,200,000. The wage/property limit is 25% of $0 wages plus 2.5% of $1,200,000, or $30,000. The full 20% would be $20,000. Because $30,000 exceeds $20,000, they keep the full $20,000 even though they are inside the phase-in range. Property can carry the deduction where wages do not exist.

These are illustrations with rounded figures, not predictions of your result. Real returns include state taxes, other deductions and items we skipped.

QBI for FIRE folks and side businesses

Early retirees and people coasting toward financial independence often keep a small consulting gig, a rental or two, or an online shop. QBI rewards that kind of modest business income generously, because modest incomes sit below the threshold and avoid the SSTB and wage complications entirely. A part-time consultant with $40,000 of profit and little other income could deduct close to 20% of the QBI, subject to the taxable income cap.

Two wrinkles matter in early retirement. First, large Roth conversions raise taxable income, which can raise the QBI deduction when the taxable income cap was the binding limit, but can also push an SSTB owner into the phase-in. Second, because QBI does not reduce AGI, it does nothing for ACA premium tax credits. If you are managing MAGI for health insurance, plan around the above-the-line deductions first and treat QBI as a bonus that shows up later on the return.

Keep a simple spreadsheet each year: QBI by business, W-2 wages, UBIA, any carryforward loss, and taxable income before QBI. Next year's preparer, or next year's you, will be grateful.

Common mistakes

• Using Schedule C profit as QBI without subtracting half of SE tax, SE health insurance and retirement contributions.
• Forgetting loss carryforwards. A prior-year net QBI loss reduces this year's QBI.
• Claiming the safe harbor without hour logs. The 250-hour rule requires records showing hours, dates, services and who performed them.
• Thinking QBI reduces SE tax or AGI. It does neither.
• Assuming every high earner is an SSTB. Engineers, architects, contractors and many tech businesses are not.