Prompt CPAIf you own a business that isn't a C corporation — a sole proprietorship, a single-member LLC, a partnership, or an S corporation — there's a deduction on your return that can take up to 20% off your business income before tax is calculated. It's the qualified business income (QBI) deduction under Section 199A, and it arrives as one quiet line on the Form 1040. Most owners either take it without understanding it or lose part of it without ever noticing.
For years the larger problem was that it was temporary. Section 199A was scheduled to expire after 2025, which made it awkward to build any multi-year plan around. The 2025 tax law — the "One Big Beautiful Bill Act," or OBBBA — made it permanent, widened the range over which it phases out, and added a small minimum deduction for owners whose calculation would otherwise come out very low. That shifts it from a deduction you simply receive into one worth planning around.
What the deduction actually is
Section 199A generally allows an eligible owner to deduct up to 20% of qualified business income (QBI) from a domestic pass-through trade or business. There's a second, separate 20% component for qualified REIT dividends and qualified publicly traded partnership income, which isn't subject to the wage and property limits described below.
Three structural points shape everything else:
- It's available whether you itemize or take the standard deduction — it isn't an itemized deduction.
- It does not reduce adjusted gross income. It's applied after AGI, so it generally won't help with the many phaseouts on a return that key off AGI or modified AGI.
- It does not reduce self-employment tax. Schedule SE is computed as though the deduction didn't exist.
There's also an overall ceiling that catches people by surprise: the total deduction is generally limited to 20% of taxable income calculated before the QBI deduction, minus net capital gain (with qualified dividends treated as part of that net capital gain figure). For an owner whose business income is most of their income, this ceiling — not the 20%-of-QBI figure — is frequently the number that actually applies.
What counts as qualified business income — and what doesn't
QBI is generally the net income from a qualified trade or business conducted in the United States. Several categories are specifically excluded:
- Capital gains and losses, and dividends.
- Interest income not properly allocable to the trade or business.
- W-2 wage income, including reasonable compensation an S corporation pays its shareholder-employee.
- Guaranteed payments to a partner under §707(c).
- Income earned as an employee, and income earned through a C corporation, neither of which is eligible at all.
The commonly missed piece runs the other direction. QBI must also be reduced by deductions attributable to the business that are claimed elsewhere on the return — including the deductible portion of self-employment tax, the self-employed health insurance deduction, and contributions to a self-employed retirement plan. Owners who calculate 20% of their Schedule C net profit and stop there generally overstate the deduction, sometimes substantially.
The three income zones
Almost all of the complexity in §199A depends on where your taxable income lands — not your revenue, and not your business profit. These are the 2026 figures, from the IRS's annual inflation adjustments in Rev. Proc. 2025-32:
| Filing status | Threshold | Top of phase-in range |
|---|---|---|
| Married filing jointly | $403,500 | $553,500 |
| Single / head of household | $201,750 | $276,750 |
| Married filing separately | $201,775 | $276,775 |
Below the threshold, the rules are close to as simple as they get. You generally take 20% of QBI, subject to the overall taxable-income ceiling. There's no wage limit, no property limit, and — importantly — it doesn't matter what kind of business you're in.
Inside the phase-in range, the limitations come in proportionately as income rises through the range. For a business that isn't a specified service business, that means just one thing: the wage and property limit below phases in gradually.
For a specified service business, two things happen at once, and it's worth being precise because they're easy to conflate. First, the QBI itself — along with the associated W-2 wages and property basis — is progressively reduced as taxable income moves through the range, so a shrinking fraction of the business's income even counts. Second, the wage and property limit phases in on top of that reduced amount. Once taxable income clears the top of the range, the service business's QBI is excluded in full. So a "partial deduction" in this zone doesn't mean the service business stays fully eligible with a softer wage cap — it means a shrinking slice of its income qualifies at all. Either way it's a gradual reduction rather than a cliff, but the mechanics are genuinely intricate and this is the zone where do-it-yourself calculations most often go wrong.
Above the range, the limitations apply in full. Your deduction for each business is capped at the greater of (a) 50% of the W-2 wages that business paid, or (b) 25% of those W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition (UBIA) of its qualifying depreciable property. A one-person business with no payroll and no equipment — a solo freelancer paid on a 1099, say — can find that cap lands at or near zero. The practical effect of these limits is to tie the deduction to businesses that pay wages or hold depreciable property.
The SSTB question: which businesses get shut out
A specified service trade or business (SSTB) loses the deduction entirely once taxable income exceeds the top of the phase-in range. The statutory list covers businesses performing services in:
- Health, law, accounting, and actuarial science
- Performing arts, consulting, and athletics
- Financial services and brokerage services
- Investing and investment management, and trading or dealing in securities, partnership interests, or commodities
- Any trade or business whose principal asset is the reputation or skill of one or more of its employees or owners
Two details on that list are worth knowing, because they're where the common misconceptions live.
First, engineering and architecture are deliberately excluded. Section 199A borrows its list from §1202 but explicitly drops those two fields, so an engineering or architecture firm is generally not an SSTB even at high income. Second, the "reputation or skill" catch-all is far narrower than it sounds. Read literally it would sweep in nearly every owner-operated business, and the final regulations declined to read it that way: Reg. §1.199A-5(b)(2)(xiv) limits it to a short list of fact patterns — income from endorsing products or services, licensing an individual's image, likeness, name, signature, or voice, and fees for appearing at an event or in media. A skilled tradesperson, a designer, or a marketing agency owner generally isn't an SSTB merely because clients hire them for their personal ability.
Businesses that are partly service and partly not can raise a separate question about whether the activities are genuinely one trade or business or two — an analysis with anti-abuse rules attached, and one worth working through with a preparer rather than deciding on your own.
What OBBBA changed, effective 2026
Three changes matter for planning:
- The deduction is permanent. The scheduled expiration after 2025 is gone. Multi-year decisions — entity choice, equipment purchases, retirement plan design — can now treat §199A as a permanent part of current law rather than a provision with an expiration date attached.
- The phase-in range is wider. It went from $50,000 to $75,000 for single filers and from $100,000 to $150,000 for joint filers, and is indexed for inflation after 2026. Practically, the limitations now bite more gradually, and some SSTB owners who previously phased out completely retain a partial deduction.
- There's a new $400 minimum deduction. Under §199A(i), a taxpayer with at least $1,000 of aggregate QBI from active qualified trades or businesses — meaning ones in which they materially participate, within the meaning of §469(h) — generally receives at least $400, if that's more than the regular calculation. Both amounts are indexed after 2026.
One clarification on that last item, because it's being described loosely in a lot of coverage: the $1,000 is the trigger for the minimum, not a new eligibility floor for the deduction generally. And the test is taxpayer-level, not business-by-business: it looks at your aggregate QBI across all active qualified trades or businesses. A taxpayer with $600 of aggregate active QBI doesn't lose their regular deduction; they simply don't qualify for the $400 guarantee.
A worked example: where the ceiling actually binds
Maya is single and runs a freelance product design practice as a single-member LLC. Her Schedule C nets $150,000 for 2026. She contributes $20,000 to a solo 401(k) and pays $6,000 in self-employed health insurance premiums. She has no employees and no significant depreciable equipment. She takes the standard deduction ($16,100 for a single filer in 2026) and has no capital gains.
| Step | Amount |
|---|---|
| Schedule C net profit | $150,000 |
| Less deductible half of self-employment tax | ($10,597) |
| Less solo 401(k) contribution | ($20,000) |
| Less self-employed health insurance | ($6,000) |
| Qualified business income | $113,403 |
| 20% of QBI | $22,681 |
| Taxable income before the QBI deduction ($113,403 − $16,100) | $97,303 |
| Overall ceiling: 20% of taxable income minus net capital gain | $19,461 |
| QBI deduction (the lesser of the two) | $19,461 |
Maya's taxable income is comfortably under the $201,750 threshold, so the wage and property limits never enter the picture and it wouldn't matter if her work were an SSTB. Yet her deduction still isn't 20% of $150,000, or even 20% of her QBI. It's the overall taxable-income ceiling that decides the number — a routine outcome for an owner whose business is essentially their whole income and who takes the standard deduction. (The self-employment tax figure assumes 15.3% on 92.35% of net profit, with net earnings below the Social Security wage base; the amounts are rounded.)
One caution on reading that table: those three subtractions are Maya's only adjustments, and the business is her only source of income, so her adjusted gross income also happens to land on $113,403. That's a coincidence of this fact pattern, not a rule. QBI and AGI are separate concepts computed for different purposes — AGI starts from all of your income, while QBI starts from the qualified business and never includes wages, capital gains, or interest. Add a spouse's salary or a brokerage account and the two figures diverge immediately.
Where QBI collides with your other decisions
S corporation salary. Reasonable compensation you pay yourself is wage income, so it's excluded from QBI — a higher salary generally shrinks the deduction. But above the threshold, W-2 wages are what the 50%/25% limitation is measured against, so a higher salary can also enable a deduction that would otherwise be capped near zero. The two effects run in opposite directions and the balance depends on your income level. We cover the surrounding decision in the S-Corp election article and how to set a defensible number in the reasonable compensation article.
Rental real estate. Rental income isn't automatically QBI, because a rental isn't automatically a trade or business. There's a safe harbor with real requirements attached, and it's covered in depth in the Schedule E deductions article rather than repeated here.
Retirement plan design. As Maya's example shows, self-employed retirement contributions reduce QBI. For an owner near a threshold the contribution often still wins on net, because preserving the deduction can outweigh shrinking its base — but "often" isn't "always," and the direction of the answer changes with income.
Timing. Because everything keys off taxable income, accelerating a deductible expense into this year or deferring an invoice into next can move you across a threshold. This is ordinary planning, not a maneuver, and it works best when the underlying business reason holds up on its own.
The bottom line
The QBI deduction stopped being a temporary provision and became part of the permanent structure of how pass-through businesses are taxed. That's genuinely good news, and it raises the value of getting the details right rather than accepting whatever number the software produces.
If your taxable income is below the threshold, the deduction is close to automatic and the main risk is overstating QBI by forgetting the required reductions. If you're in or above the phase-in range, the wage limits, the property basis calculation, the SSTB analysis, and the interaction with your salary and retirement contributions all become live variables — and they're variables you can influence, if you look at them before the year closes rather than after.
Frequently asked questions
Should I restructure my business just to get the QBI deduction?
Rarely on its own. Restructuring — electing S-Corp status, splitting an operating business from a property-holding entity, reorganizing ownership — carries real filing, payroll, and administrative costs, and the anti-abuse rules limit some of the more aggressive separations. The deduction is usually a factor in a restructuring decision rather than the reason for one. The better question is generally whether the structure fits how the business actually operates, with the QBI effect modeled as one output among several.
I'm a consultant above the income threshold — is the deduction gone for me?
For income from the consulting business itself, generally yes once taxable income clears the top of the phase-in range — that's $276,750 for a single filer and $553,500 for joint filers in 2026. But taxable income is the measure, not revenue, so deductible retirement contributions, business expenses, and timing decisions can pull you back into the phase-in range where a partial deduction survives. Income from a separate non-SSTB business you own is also evaluated on its own.
Does maxing out my solo 401(k) help or hurt my QBI deduction?
Both, which is why it needs to be modeled rather than assumed. A self-employed retirement contribution reduces taxable income, which can pull you under the threshold or into the phase-in range and preserve a deduction you'd otherwise lose. But it also reduces qualified business income itself, so the 20% is calculated on a smaller number. For an owner near a threshold the contribution is often still worth making; for an owner comfortably below it, the QBI benefit is partly offset.
Does the QBI deduction lower my self-employment tax too?
No. Self-employment tax is computed on Schedule SE from your net earnings from self-employment, and the QBI deduction doesn't enter that calculation. It also doesn't reduce adjusted gross income, so it generally won't help with AGI-driven phaseouts elsewhere on the return. It reduces taxable income, and therefore income tax, only.
I have two businesses and one lost money. Does the loss wipe out my deduction?
It reduces it. Qualified business income is generally netted across all of your qualified trades or businesses, so a loss in one offsets profit in another before the 20% is applied. If the combined result for the year is negative, that negative amount is generally carried forward and treated as a loss from a qualified business in the following year, reducing next year's QBI. The loss isn't lost, but it does defer the benefit.
This article is general educational information, not individualized tax advice. Please consult a qualified tax professional about your own situation before making decisions.