This is what the calculation gives for the numbers you entered. It is an estimate, not advice, and it knows nothing about your situation beyond those numbers. Rules for United States change on a published schedule; the effective date is shown on every rule-based tool.
How this is calculated
The deduction is twenty percent of qualified business income, capped at twenty percent of taxable income. Below the threshold that is the whole calculation. Above it, two things happen: the deduction becomes limited by W-2 wages the business pays, and a specified service trade or business, which covers most professional services, phases out entirely across the range above the threshold. That cliff makes taxable income management unusually valuable for professionals near the threshold.
Worked examples
Each of these is asserted on every build. If a change to the engine ever moved one of these answers, the build would fail before the page could print it.
a non-service business below the threshold
- Qualified business income
- $180,000.00
- Taxable income before this deduction
- $195,000.00
- W-2 wages paid by the business
- $60,000.00
- Phase-in threshold
- $197,300.00
- Phase-in range
- $50,000.00
- A specified service trade or business
- No
- Marginal rate
- 24%
QBI deduction$36,000.00
20% of 180,000, under the 39,000 income cap
Open this examplea service business above the threshold loses part of it
- Qualified business income
- $180,000.00
- Taxable income before this deduction
- $222,300.00
- W-2 wages paid by the business
- $60,000.00
- Phase-in threshold
- $197,300.00
- Phase-in range
- $50,000.00
- A specified service trade or business
- Yes
- Marginal rate
- 24%
QBI deduction$18,000.00
boundary: halfway through the phase-out
Open this exampleno business income means no deduction
- Qualified business income
- $0.00
- Taxable income before this deduction
- $195,000.00
- W-2 wages paid by the business
- $60,000.00
- Phase-in threshold
- $197,300.00
- Phase-in range
- $50,000.00
- A specified service trade or business
- No
- Marginal rate
- 24%
QBI deduction$0.00
degenerate case
Open this exampleMethod and limits
What it assumes
- A single business with the wage figure entered.
What it deliberately does not model
- The unadjusted basis of qualified property provides an alternative limit not modelled here.
- Aggregation rules across multiple businesses are not applied.
- This is an estimate, not tax advice.
Formula version 1.0.0 · definition 1.0.0 · United States · Report a problem with this calculator
Frequently asked questions
- What is a specified service trade or business?
- Broadly, businesses where the principal asset is the reputation or skill of its people: health, law, accounting, consulting, financial services and similar. They lose the deduction above the threshold.
- Why does income just above the threshold matter so much?
- Because the phase-out is compressed into a narrow range. For a service business, a modest amount of extra income can remove the entire deduction.