Tax Calculator
QBI Deduction Estimator: What It Calculates and How to Read the Result
Quick answer
The Section 199A deduction lets eligible pass-through business owners deduct up to 20% of their qualified business income. Below roughly $201,750 (single) or $403,500 (MFJ) of taxable income, most owners get the full 20%. Above that range, a wage-based limit phases in, and owners of specified service businesses (law, accounting, consulting, financial services, and similar fields) can lose the deduction entirely.
- Phasing in: wage limit and SSTB phase-out are blending
- Small assumption changes can materially change outcomes.
- A coordinated plan can reduce risk and improve efficiency.
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| Phase-in range starts at | $201,750 |
| Phase-in range ends at | $276,750 |
| Federal tax without QBI deduction | $46,856 |
| Federal tax with QBI deduction | $38,198 |
| Estimated tax savings | $8,658 |
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This estimate ignores the net-capital-gain cap on the QBI deduction, the Unadjusted Basis Immediately After Acquisition (UBIA) alternative to the wage limit, and multiple-business aggregation rules.
Filing statuses other than Single and Married Filing Jointly (e.g. Head of Household) are not modeled separately; use Single as an approximation.
This calculator provides educational estimates only. Actual Sec. 199A outcomes depend on your complete return. Consult a qualified tax professional before acting on these figures.
What This Calculator Actually Answers
If you own a Schedule C business, an S corp, a partnership, or most other pass-through entities, this calculator estimates your Sec. 199A qualified business income (QBI) deduction and the federal tax savings it produces, walking through the same three tests the IRS applies: the overall taxable-income cap, the taxable-income phase-in threshold, and (above that threshold) the wage-based limitation or SSTB phase-out.
The output shows not just the dollar deduction, but which regime you fall into — full deduction, partially phased in, or wage-limited/eliminated — so you understand why the number is what it is, not just what it is.
How to Read the Result
'Taxable income before QBI deduction' is not your business's net profit; it's your Form 1040 taxable income (AGI minus your standard or itemized deduction) before subtracting Sec. 199A. Getting this input right matters more than any other field, because it's what determines which phase-in regime applies.
If your business pays little or no W-2 wages and your taxable income is above the phase-in range, the wage limitation can shrink or eliminate the deduction even for a highly profitable business. This is one of the most common surprises for solo S corp owners: the same reasonable-compensation salary you pay yourself to satisfy IRS rules is also what makes the QBI deduction survive at higher income levels.
Common Mistakes
- Entering business net profit instead of taxable income before QBI in the taxable-income field. These are different numbers, and the phase-in thresholds only apply to the second one.
- Assuming a service business is automatically disqualified. SSTBs only lose the deduction once taxable income is above the phase-in range; below the threshold, SSTB owners get the full 20% deduction like anyone else.
- Forgetting the wage limitation applies to the business's total W-2 wages, not just the owner's own salary, when the business has other employees.
- Ignoring the UBIA (unadjusted basis in qualified property) alternative to the wage test, which this estimator doesn't model — capital-intensive businesses with low wages but significant depreciable property may qualify for a larger deduction than shown here.
When This Calculator Is Not the Right Tool
This estimator simplifies Sec. 199A: it ignores the net-capital-gain cap on the deduction, the UBIA alternative to the wage limit, and aggregation rules across multiple businesses. If you own more than one pass-through business, or a capital-intensive business with significant depreciable property and low wages, the real deduction may differ meaningfully from this estimate. If you're deciding between S corp and sole proprietor structures in the first place, the S Corp Reasonable Compensation Calculator models QBI alongside the full tax comparison.
Frequently Asked Questions
What counts as a Specified Service Trade or Business (SSTB)?
Law, accounting, health, consulting, financial services, brokerage services, performing arts, athletics, and any business where the principal asset is the reputation or skill of its owners or employees. Most other businesses (retail, manufacturing, real estate, most trades) are not SSTBs.
Does the S corp salary I pay myself affect my QBI deduction?
Yes, indirectly. Reasonable compensation you pay yourself as an S corp officer counts toward the business's W-2 wages for the wage limitation test, which can help preserve the QBI deduction at higher income levels. It also reduces the business's remaining QBI, since your own wages aren't part of QBI. There's a real tradeoff here worth modeling with a tax professional.
Is the QBI deduction permanent?
Section 199A was made permanent (rather than sunsetting after 2025) with expanded phase-in ranges starting in 2026. Always confirm current-year figures before relying on a projection more than a year or two out.
How much can the QBI deduction actually save me?
For an owner comfortably below the phase-in threshold, the deduction shelters 20% of QBI from federal ordinary income tax, worth roughly $0.20 times your marginal rate for every dollar of QBI. At a 24% marginal rate, that's about a 4.8-cent tax savings per dollar of qualified business income.