How Section 199A came to exist
When the 2017 Tax Cuts and Jobs Act cut the corporate tax rate to a flat 21%, it created an imbalance. C corporations received a large, permanent rate cut — but the vast majority of US businesses are not C corporations. They are pass-throughs: sole proprietorships, partnerships, S corporations, and LLCs, whose income is taxed on the owners’ personal returns at individual rates reaching 37%. Left alone, the reform would have handed corporations a steep advantage over the small businesses that make up most of the economy.
So Congress added Section 199A: a deduction of up to 20% of qualified business income, lowering the effective rate on pass-through profit to keep it roughly competitive with the new corporate rate. From the start it was an owner-level benefit — claimed on the individual return, calculated against the owner’s total income, not the business’s. Originally set to expire after 2025, it was made permanent by OBBBA legislation in July 2025, which also widened its limits and added a small minimum deduction. It is among the most valuable deductions available to small-business owners and, as the offshore section develops, the clearest case of a number that the business supplies the raw material for but that only the owner’s complete return can actually compute.
What is the Section 199A deduction?
The Section 199A deduction — the qualified business income (QBI) deduction — lets owners of pass-through businesses deduct up to 20% of their qualified business income on their personal returns. At higher incomes the deduction is limited by the type of business and by the wages and property of the business; for certain service businesses it phases out entirely.
The deduction equals the lesser of 20% of qualified business income or 20% of taxable income less net capital gain. The crucial structural fact is where it is computed: on the owner’s personal return, against the owner’s total taxable income. The business produces the qualified business income; whether and how much of it becomes a deduction depends on the owner’s whole tax picture.
How the QBI deduction works in practice
The purpose. To give pass-through owners a benefit comparable to the 21% corporate rate, by deducting a portion of their business income from taxable income.
Below the threshold — simple. If taxable income is below the threshold (for 2026, roughly $201,750 single / $403,500 married filing jointly), the owner generally gets the full 20%, and even service businesses qualify. The deduction is available whether the owner itemizes or takes the standard deduction.
Above the threshold — two complications engage.
- SSTB exclusion. A specified service trade or business — health, law, consulting, accounting, financial services, athletics, and similar fields — phases out across the income range above the threshold and is fully excluded above the top of it.
- Wage/UBIA limit. For non-service businesses, the deduction is capped at the greater of 50% of the business’s W-2 wages, or 25% of W-2 wages plus 2.5% of the unadjusted basis of qualified property (UBIA).
The phase-in ranges. OBBBA widened the ranges over which these limits phase in to $75,000 (single) / $150,000 (MFJ) for 2026.
The $400 minimum. New for 2026: if QBI is at least $1,000 and the owner materially participates, the deduction is at least $400. This does not rescue a fully excluded SSTB owner.
Two exclusions that matter. A reasonable S-corp salary (W-2 wages) is not QBI — only the pass-through profit is. C-corporation income and W-2 employee wages do not qualify.
The forms. Form 8995 for the simplified case (below the threshold); Form 8995-A for the complex case (above the threshold, SSTBs, aggregation).
Section 199A rules for 2026
| Rule / threshold | 2026 figure | Notes |
|---|---|---|
| Income threshold (single) | ~$201,750 | Per Rev. Proc. 2025-32; inflation-indexed. Limits begin above this level |
| Income threshold (MFJ) | ~$403,500 | Above this, SSTB phase-out begins and wage/UBIA limit engages |
| Phase-in range (single) | $75,000 | Widened by OBBBA; limits phase in across this range above the threshold |
| Phase-in range (MFJ) | $150,000 | Same as above for joint filers |
| Wage/UBIA limit | Greater of 50% W-2 wages or 25% W-2 + 2.5% UBIA | Applies to non-SSTB businesses above the threshold |
| Minimum deduction | $400 (with $1,000 QBI floor) | New for 2026; requires material participation; does not override SSTB exclusion |
| Sunset | None — permanent | OBBBA removed the prior 2025 expiration |
⚠️ Verify all figures against current IRS guidance at publish — thresholds are inflation-indexed and were adjusted by OBBBA 2025.
Who benefits and who is excluded
| Industry / context | How Section 199A applies |
|---|---|
| Trades & contractors | Non-SSTB; full benefit below threshold, wage/UBIA limit above |
| Manufacturing & retail | Non-SSTB; wages and property support the deduction at higher incomes |
| Real estate | May qualify via safe harbor; property-heavy owners benefit from the UBIA component |
| Law, medicine, consulting, accounting | SSTBs — the deduction phases out and is lost above the upper threshold |
| Financial & investment services | SSTBs — excluded at higher incomes |
| Small / lower-income pass-throughs | Below the threshold, the full 20% generally applies regardless of business type |
How the QBI deduction works in accounting software
The entity software — QuickBooks Online, Xero, Sage, Zoho Books — produces the components the deduction is built from: the qualified business income for the period, the business’s W-2 wages, and the unadjusted basis of qualified property (UBIA). These flow to the owner on the Schedule K-1. The entity software can produce these inputs accurately.
What the entity software cannot do is compute the deduction itself. Form 8995 and Form 8995-A require the owner’s total taxable income, filing status, capital gains, and all other QBI sources — data that lives on the personal return, not the business books. The components are entity-level; the deduction is owner-level, computed where the entity software does not reach.
How CPA firms work with Section 199A
For a CPA or EA firm, Section 199A is an owner-level deduction built from entity-level parts. The firm handles: SSTB determination (characterizing whether the business is a specified service trade or business — decisive above the threshold); applying the limits (running the thresholds, the wage/UBIA limit, and the phase-ins on Form 8995-A); coordination with the reasonable-comp split in S corporations (salary is not QBI); aggregation elections where multiple entities are owned; and income planning to stay under or manage exposure to the thresholds.
The firm computes the deduction on the owner’s return, where the owner’s whole picture is in view. The entity supplies QBI, wages, and UBIA. The deduction is the firm’s computation.
Section 199A and offshore accounting
Section 199A is the sharpest point in the tax cluster: a single line where the entity’s numbers and the owner’s life fuse, and where the deduction cannot be computed from the entity side no matter how complete the entity data is. The business supplies the raw material. The deduction is assembled on the owner’s return.
The structure makes this vivid. Below the income threshold, the deduction is a clean 20% of qualified business income, and the entity’s number is nearly the whole answer. Above the threshold — which is the owner’s total taxable income, including a spouse’s earnings and every other source the business knows nothing about — the deduction transforms. Now it depends on whether the business is a specified service trade or business, which can phase the deduction down to zero. It depends on the business’s W-2 wages and qualified property, run through a limit that only engages because of the owner’s overall income. The same qualified business income produces a full deduction, a reduced one, or none at all, depending entirely on the shape of a return the offshore team cannot see.
The characteristic offshore failure mode has a precise name: mistaking the QBI for the deduction. Qualified business income is an entity-level component the offshore team can and should compute accurately. The Section 199A deduction is an owner-level determination. The two share a name and a twenty-percent relationship — and that is exactly the trap. The offshore team that computes 20% of QBI and reports it as the QBI deduction has, for any owner above the threshold, produced a number that may be a fraction of the truth or entirely wrong.
The discipline is the pass-through discipline at its most exact. The offshore team computes and carries the components — qualified business income, the W-2 wages, the UBIA — faithfully across the K-1, because those are entity facts it owns. It surfaces these components and flags the determinations the owner’s return will require: this is QBI of X, with W-2 wages of Y and UBIA of Z, for the owner’s 199A computation; this business appears to be a specified service trade or business — above the income threshold the deduction may be limited or lost, for the firm to confirm. The SSTB characterization, the application of the thresholds and limits against the owner’s total income, and the deduction on the 1040 are the firm’s. The offshore team builds the parts; the firm assembles the deduction.
What are the common misconceptions about Section 199A?
- “The QBI deduction is just 20% of my business income.” Only below the income thresholds. Above them, it is limited by the business type, by wages and property, and capped at 20% of total taxable income. The 20%-of-QBI figure is the starting point, not always the answer.
- “My business’s income determines my deduction.” The business supplies the qualified business income, but the deduction is figured on the personal return against total taxable income. The same business income can produce a full deduction, a reduced one, or none, depending on overall income and filing status.
- “All pass-through businesses qualify equally.” No. Specified service businesses — law, medicine, consulting, financial services — lose the deduction once income passes the upper threshold, while other businesses can still qualify subject to wage and property limits.
- “My S-corp salary counts as qualified business income.” No. The W-2 salary is specifically excluded from QBI; only the pass-through profit qualifies.
- “C-corp owners get the QBI deduction too.” No. It is only for pass-through income. C corporations received the 21% rate instead.
What terms are commonly confused with Section 199A?
| Confused with | The key difference |
|---|---|
| Pass-Through Entity | The category of business whose income qualifies; Section 199A is the deduction on that income, computed at the owner level |
| Qualified Business Income (QBI) | The entity-level input — the business profit that qualifies. The deduction is 20% of it subject to limits, and is not the same thing as QBI |
| S Corporation | The reasonable salary is excluded from QBI, so the comp split interacts with the deduction — but the entity and the deduction are different things |
| Standard Deduction | A separate deduction; the QBI deduction is available whether you itemize or take the standard deduction |
| C Corporation | Ineligible for the deduction; received the 21% corporate rate instead |
Common client questions about Section 199A
What is the QBI deduction and do I get it?
It is a deduction of up to 20% of your business’s qualified income, for owners of pass-through businesses like sole proprietorships, partnerships, S-corps, and LLCs. Whether you get the full 20% depends on your total income and the type of business. Below certain income thresholds it is straightforward; above them it gets more limited, especially for service businesses like law, medicine, or consulting. C-corp owners do not get it — they received the lower corporate rate instead.
Is it just 20% of my business profit?
Below the income thresholds, essentially yes. But above them, it is limited by the wages your business pays and the property it owns, and for specified service businesses it phases out entirely. It is also capped at 20% of your overall taxable income. The 20%-of-profit figure is a starting point, not always the final number — at higher incomes the actual deduction can be considerably less, or even nothing.
Your team prepares my K-1 — does that include my QBI deduction?
Your K-1 carries the pieces the deduction is built from — your qualified business income, the business’s W-2 wages, and its qualified property — and we make sure those are accurate. But the deduction itself is computed on your personal return, because it depends on your total taxable income, whether your business counts as a service business, and how it fits with everything else on your 1040. The business produces the inputs; the deduction is figured with your whole picture in view.
I have an S-corp — how does my salary affect this?
Your reasonable W-2 salary does not count as qualified business income — only the profit that passes through does. So a higher salary lowers your QBI, but above the income thresholds it can also help satisfy the wage limit. It is a balance the firm weighs when setting the salary, and it is part of why that figure is a planning decision rather than just a number to minimize.
Why might I lose the deduction even though my business did well?
Because the deduction is tied to your total taxable income, not just the business. Once your income passes the threshold, the rules tighten: if you are in a service field like consulting or medicine, the deduction can disappear entirely, and for other businesses it gets capped based on wages and property. A high-income year — from the business or from other income — can reduce or eliminate a deduction you would have received at a lower income level.
