The QBI Deduction, Explained

What qualified business income actually is

Qualified business income is the net profit from a qualifying US trade or business that passes through to your personal return — a sole proprietorship, a single-member LLC, a partnership, or an S corporation. If you file a Schedule C, your net profit is the starting point.

Several things are not QBI, and the exclusions catch people out. W-2 wages are not qualified business income, which is why an S-corporation election shrinks the deduction: every dollar routed into salary leaves the §199A base. Capital gains, dividends, and interest income are excluded. So is income from a business conducted outside the United States. And the deduction is calculated after the above-the-line deduction for half of your self-employment tax, so the base is slightly smaller than your headline profit.

What the OBBBA changed

Two things. The deduction was scheduled to expire at the end of 2025; it is now permanent, which removes the planning uncertainty that hung over every pass-through business for years.

Second, from 2026 there is a minimum deduction of $400 for taxpayers with at least $1,000 of qualified business income from one or more active trades or businesses in which they materially participate — regular, continuous, and substantial involvement, in the sense used by IRC §469(h). Both the $1,000 threshold and the $400 minimum are indexed for inflation for years after 2026.

The practical effect is narrow but real: it helps taxpayers whose ordinary 20% calculation would have produced less than $400, which generally means small side businesses. If your profit is $50,000, the minimum changes nothing — your ordinary QBI deduction is far larger.

Why your QBI deduction might be zero

This is the most common question about §199A, and there are four usual causes.

The first is that the deduction is capped at 20% of your taxable income before the QBI deduction, not just 20% of business profit. If the standard deduction has already absorbed most of your income, there is little taxable income left for the cap to work against, and the deduction shrinks accordingly. A single filer with $20,000 of profit and no other income sees this immediately.

The second is a business loss. No profit, no qualified business income — and a loss carries forward to reduce next year's QBI.

The third is the income threshold. Above roughly $201,775 for single filers and $403,500 for joint filers in 2026, limits based on W-2 wages paid and property held begin to phase in. For a specified service trade or business — health, law, accounting, consulting, athletics, financial services, and similar fields where the principal asset is the reputation or skill of its employees — the deduction phases out entirely above the range rather than merely being limited.

The fourth is simply that the income was not QBI: wages, investment income, or gains do not qualify however the business is structured.

What the QBI deduction does not do

It does not reduce self-employment tax. This trips people up constantly, and the reason is structural: self-employment tax is calculated on Schedule SE from your net earnings, before any income-tax deductions are applied. QBI is an income-tax deduction, taken further down the return. Your 15.3% is untouched.

It is also not a business expense and does not appear on Schedule C. It reduces taxable income on your Form 1040 after your business profit has already been determined. That means it cannot create a business loss, and it cannot be used to reduce the profit that self-employment tax or the QBI calculation itself is based on.

And it is not a credit. A deduction reduces the income you are taxed on; a credit reduces the tax itself. A $10,000 QBI deduction saves $1,200 in the 12% bracket, not $10,000. Our self-employment tax calculator applies the deduction and shows both taxes side by side.

How the deduction interacts with an S-corp election

Directly, and against you. An S-corporation election moves part of your profit into W-2 wages, and wages are not qualified business income. Every dollar of salary removes a dollar from the §199A base, so you give up a 20% deduction on that dollar in exchange for avoiding 15.3% of payroll tax on it.

This is the offset most S-corp calculators omit, and it materially changes the answer. At $120,000 of profit with a $60,000 salary, an election avoids $7,775 of payroll tax but forfeits $8,242 of QBI deduction. It still comes out ahead once the income-tax arithmetic is worked through, but by far less than the gross figure suggests — and at lower profit, or with a more conservative salary, it can tip negative. The S corp tax calculator prices both effects together.

Nothing to elect, but plenty to get wrong

You do not elect the QBI deduction. It is claimed on Form 8995 for straightforward cases, or Form 8995-A where the income thresholds and limitations apply, and tax software generally handles it once your business income is entered correctly.

What is worth checking is the input rather than the calculation. Overstated profit produces an overstated deduction and an overstated tax bill; understated deductions elsewhere on Schedule C do the same. And if you run more than one business, QBI is calculated per business and then combined, so a loss in one can offset profit in another.

If your income is near the phase-in threshold, this is one of the genuine cases where a preparer earns their fee — the interaction between the wage limitation, the property limitation, and specified service trade status is where the rules stop being intuitive.

Frequently asked questions