Leo's qualified business income (QBI) deduction for 2026 is $9,791, not the $14,000 he got by taking 20% of his $70,000 profit. Two rules shrink it. QBI is profit minus the deductible half of self-employment tax, and the whole deduction is capped at 20% of taxable income before the deduction. For a single freelancer with no other income, that second cap is usually the one that decides the number.
Leo is invented. The rules and the arithmetic are not. Every figure below comes from the 2026 values the site's calculators use, and the method follows the IRS page on the Qualified Business Income Deduction.
What the QBI deduction is
The deduction, from section 199A of the tax code, lets owners of sole proprietorships, partnerships and S corporations deduct up to 20% of their qualified business income. Three things about it surprise people:
- It is taken whether you itemize or take the standard deduction, so most freelancers get it on top of the standard deduction.
- It lowers income tax only. It does not reduce self-employment tax, which is still charged on 92.35% of net profit.
- "Up to 20%" means exactly that. The IRS describes the deduction as "the lesser of" the QBI component or "20 percent of the taxable income minus net capital gain".
Leo's numbers, step by step
Leo is a single filer, runs his design business as a sole proprietor, has $70,000 of net profit on Schedule C and no other income.
1. Self-employment tax. 92.35% of $70,000 is $64,645. At 15.3%, his self-employment tax is $9,891. Half of it, $4,945, is deductible.
2. Qualified business income. The IRS says QBI is reduced by deductions attributable to the business, which "includes, but is not limited to, the deductible part of self-employment tax, self-employed health insurance, and deductions for contributions to qualified retirement plans." So his QBI is $70,000 − $4,945 = $65,055, and 20% of that is $13,011. That is already $989 less than the $14,000 he assumed.
3. Taxable income before the deduction. $70,000 − $4,945 − the 2026 standard deduction of $16,100 = $48,955.
4. The taxable-income cap. 20% of $48,955 is $9,791.
5. The deduction is the smaller number: $9,791.
| Leo assumed | Actual | |
|---|---|---|
| Starting point | $70,000 profit | $65,055 QBI |
| 20% of it | $14,000 | $13,011 |
| Cap: 20% of taxable income | (ignored) | $9,791 |
| Deduction | $14,000 | $9,791 |
That leaves taxable income of $39,164, all inside the 12% bracket. His 2026 federal income tax comes to about $4,452. With the $14,000 he planned around, it would have come to about $3,947. The $505 gap matters because Leo sets his quarterly estimated payments from that number. Underpay, and the shortfall shows up in April with a possible underpayment penalty.
Why the cap catches most solo freelancers
When your business is your only income, taxable income is your profit minus the standard deduction, so it is always smaller than QBI. The cap then binds every time. The cap stops binding only when there is enough other taxable income, like a salary, a spouse's wages, or interest, to push taxable income above QBI.
Give Leo a $40,000 W-2 job on top of the same $70,000 freelance profit. His taxable income before the deduction becomes $88,955. Twenty percent of that is $17,791, larger than 20% of his QBI. So his deduction rises to the full $13,011. The W-2 salary itself never counts as QBI. It only lifts the ceiling.
This is also why a Solo 401(k) or SEP IRA contribution costs a little QBI deduction: the IRS counts those contributions among the deductions that reduce QBI. The contribution still lowers your tax far more than the small amount of QBI deduction it removes. Just don't budget the QBI deduction as if the contribution weren't there. (Solo 401(k) vs SEP IRA shows what each plan lets you put in.)
The income limits, for when business is good
Below a threshold, the deduction is simply the smaller of the two numbers above. For 2026 the threshold, measured on taxable income before the deduction, starts at $203,000 for single and head-of-household filers and $406,000 for married couples filing jointly. Above it, two more limits phase in over $75,000 (single) or $150,000 (joint):
- The wage limit. The deduction becomes limited to a share of the W-2 wages the business pays (50% of them in the method our tools use) or a wage-and-property alternative. A sole proprietor with no employees has no wages, so across that range the deduction tapers toward zero. For a single filer, it is gone at $278,000 of taxable income.
- The service-business rule. If the business is a "specified service trade or business," a category the IRS rules define to include fields such as health, law, accounting, consulting and financial services, the QBI from it phases out over the same range regardless of wages.
This is where an S corporation changes the picture: the salary an S corp pays you counts as W-2 wages for the wage limit, even though that salary is not QBI. LLC vs S-Corp walks through when that trade is worth it.
New for 2026: a $400 floor
Starting in 2026, the IRS says that "if you have a minimum of $1,000 in total qualified business income from an active trade or business, you may be able to claim a minimum QBID of $400." It matters mainly for small side businesses whose 20% would come out under $400. How it interacts with the taxable-income cap is settled on the 2026 Form 8995 instructions, so check them when you file.
Frequently Asked Questions
Is the QBI deduction 20% of my net profit?
Usually not. It is 20% of qualified business income, which is net profit minus the deductible half of self-employment tax, self-employed health insurance and retirement-plan contributions. The deduction is then capped at 20% of your taxable income before the deduction. For a single freelancer with no other income, that cap usually decides the number.
Do I need to itemize to get the QBI deduction?
No. The IRS says the deduction is available whether you itemize on Schedule A or take the standard deduction. Most freelancers take both the standard deduction and the QBI deduction.
Does the QBI deduction lower my self-employment tax?
No. It reduces taxable income for income tax only. Self-employment tax is still figured on 92.35% of your net profit, so plan for it separately.
Is my W-2 salary qualified business income?
No. Wage income is on the IRS list of items that are not QBI, and so is reasonable compensation an S corporation pays you. A salary can still raise your deduction indirectly: it adds to taxable income, which loosens the 20%-of-taxable-income cap.
What form do I claim it on?
Form 8995 for most filers whose taxable income before the deduction is at or below the threshold, and Form 8995-A above it or in a few other situations. The IRS page on the deduction points to the instructions for both forms.
Should I use the QBI deduction when I set my quarterly estimated payments?
Yes, but use the capped figure, not 20% of profit. Overstating it understates what you owe, and that is the direction that can lead to an underpayment penalty. The quarterly payment guide covers the safe-harbor amounts that protect you.
Run your own number
The Quarterly Tax Estimator applies both limits automatically. It subtracts half your self-employment tax from QBI, caps the deduction at 20% of taxable income, and tapers it above the 2026 threshold, then tells you what to pay each quarter. Enter your profit and any other income, and the QBI line shows what you can actually deduct.