Starting in 2026, the Section 199A deduction works slightly different. Congress adjusted the formulas for inflation, improved how future inflation adjustments occur, and added a small “minimum” QBI deduction.
But the formula? Still very complicated. Thus, if you’re making estimates of this big, powerful business deduction? You’ll probably find the calculator below helpful.
Using the Section 199A Calculator
To use the Section 199A calculator, you replace the example data below with your numbers and then press the Calculate button. Additional instructions and information appear beneath the calculator.
Additional Information about the Calculator
You need to enter a handful of inputs. The two most important inputs? The taxable income you expect before deducting any Section 199A “qualified business income” adjustment. And the actual qualified business income from a business or real estate investment. In most cases, the Section 199A deduction equals the lesser of either 20 percent of the taxable income or 20 percent of the qualified business income.
Higher income taxpayers see their 199A deduction limited or eliminated, however. In 2026, for example, over a taxable income of $276,750 for single taxpayers and over a taxable income of $553,500 for married taxpayers, the deduction gets limited to either no more than 50 percent of wages or no more than 25 percent of wages plus 2.5 percent of depreciable property. (You use the higher value.) For specified service trades or businesses, taxpayers lose the Section 199A deduction once taxable income before the deduction crosses those thresholds.
Thus, you need to provide the W-2 wages paid and the unadjusted basis immediately after acquisition for any depreciable property used in the business. You need to indicate whether the business is a specified service trade or business. (A specified service trade or business is something like a physician or dentist or veterinarian, an attorney or accountant, consultant, and pretty much anything that’s a white-collar-y service.) And you need to specify whether you’re filing as a married taxpayer or not.
A phase-in range exists for single taxpayers that make between $201,750 and $276,750 (so a $75,000 band) and for married taxpayers that make between $403,500 and $553,500 (so a $150,000 band.) and when a taxpayer’s taxable income falls within the band? They may lose a percentage of their Section 199A deduction. If some taxpayer is X% of the way through the band, for example, The formula applies X% of any wage or depreciable property limitation and it eliminates X% of the deduction due being specified service trade or business.
Three quick notes to wrap this up: First, the Section 199A calculator formula currently uses the 2026 phase-in ranges. (I will update the phase-in ranges for 2027 later when they’re available and revelant.) Second, as long as a business has at least $1,000 of qualified business income? The business owner gets a $400 QBI deduction. (The IRS annually adjusts the $1,000 and the $400 for inflation.) Third, head of household taxpayers calculate the 199A deduction using the exact same phase-in and threshold as single taxpayers so they get a good accurate estimate here. But married filing separate taxpayers use a slightly different phase-in ($201,775 versus $201,750) so they can use the single taxpayer estimate… but it’ll be a few dollars off.
Note: We’ve also got a lot of background information here at the blog about Section 199A.)
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