If you own a business that passes its profit through to your personal return — a sole proprietorship, partnership, S-corporation, or most LLCs — the qualified business income (QBI) deduction under Section 199A can be one of your largest tax breaks. It lets eligible owners deduct up to 20% of their qualified business income, straight off their taxable income, on top of the standard or itemized deduction.
The basic idea
QBI is generally your net business profit (with some adjustments — it excludes items like capital gains, most dividends, and reasonable S-corp wages you pay yourself). At the simplest level, if your business nets $100,000 of qualified income, the deduction can knock $20,000 off your taxable income. In the 24% bracket, that is roughly $4,800 of federal tax saved for doing nothing but claiming a deduction you are entitled to.
The deduction was created by the 2017 Tax Cuts and Jobs Act to give pass-through owners a benefit comparable to the corporate rate cut. It was scheduled to expire but has since been extended; confirm its status for your tax year, since this is exactly the kind of provision Congress revisits.
Estimate your bracket →The QBI deduction is worth your marginal rate times the deduction. Use the calculator to see which bracket your income lands in.Income thresholds change everything
Below an annual taxable-income threshold (indexed each year — for tax year 2025 it is $197,300 for single filers and $394,600 for married filing jointly; verify the current figure at IRS.gov), the rules are simple: almost any qualifying business gets the full 20%, with few extra tests. Above the threshold, the deduction phases out over the next $50,000 of taxable income (single) / $100,000 (MFJ), and two complications kick in.
1. The SSTB limitation
A specified service trade or business (SSTB) — fields like health, law, accounting, consulting, financial services, and any business whose principal asset is the reputation or skill of its owners — begins to lose the deduction once income rises into a phase-out range above the threshold, and loses it entirely at the top of that range. Engineers and architects are specifically excluded from the SSTB definition and keep the deduction. This is why a high-earning consultant may get no QBI deduction while a high-earning manufacturer gets the full 20%.
2. The wage-and-property limit
For non-SSTB businesses above the threshold, the deduction is capped by a formula based on the W-2 wages the business pays and the cost of its qualified property. Roughly, the deduction cannot exceed the greater of 50% of the business's W-2 wages, or 25% of wages plus 2.5% of qualified property. A profitable business with no employees and no equipment can find its deduction limited here — which is one reason some owners weigh S-corp status and paying themselves a wage.
Managing taxable income matters. Because the SSTB and wage limits only bite above the threshold, moves that lower your taxable income — maxing a retirement plan, an HSA, or other deductions — can pull a high earner back under the threshold and restore a QBI deduction. The interaction can make a retirement contribution worth far more than its face value.
Why professional help pays for itself
The QBI rules are among the most intricate in the individual code: aggregation elections, the SSTB definition's gray areas, the wage/property formula, rental-real-estate safe harbors, and coordination with S-corp compensation all interact. The IRS provides a worksheet (and Form 8995 / 8995-A) for the calculation, but for anyone near the thresholds, a CPA usually finds far more than their fee. Treat the 20% as a target that requires planning, not an automatic discount.