Twenty Per Cent Off, and Below the Threshold It Is Simple
Of all the provisions attached to self-employment, this is the one most often left unclaimed by people who plainly qualify. A deduction of up to 20% of business profit, available without itemising, requiring no spending and no structure. Its reputation for complexity is earned at high income, and almost none of that complexity applies to someone consulting part-time in retirement.
- The answer:: Up to 20% of qualified business income from a sole proprietorship, partnership or S corporation, deducted on your return whether or not you itemise.
- Below the threshold it is simple:: The specified service restriction and the wage and property tests only apply above a taxable income threshold. Beneath it, a consultant qualifies like anyone else.
- It is on income, not spending:: Nothing has to be bought and no structure adopted. The deduction follows from having business profit at all.
- Two subtractions come first:: Qualified business income is net profit reduced by the deductible half of self-employment tax and by any self-employed retirement plan contribution.
Where the AI summary above gets this wrong
"Consultants and other professional service businesses cannot claim the qualified business income deduction."
That's surface-true. Here's what it misses:
- The restriction only exists above the threshold — Specified service trades — consulting, law, accounting, health and others — are restricted only once taxable income passes a threshold, and phased out above it. Below that line the business type is irrelevant, which describes most retired part-time consultants.
- It is claimed without itemising — The deduction sits below adjusted gross income and is available whether you take the standard deduction or itemise. People assuming it is an itemised deduction skip it because their other deductions are small.
- Sheltering the income reduces the deduction — A solo 401(k) or SEP contribution lowers qualified business income, and therefore the 20%. Both are worth having, but the second is smaller because of the first — a genuine trade-off that the two provisions, described separately, hide.
01 What qualifies, and the threshold that governs everything
The deduction is up to 20% of qualified business income from a pass-through business — a sole proprietorship reported on Schedule C, a partnership, or an S corporation. It is taken on the return itself, below adjusted gross income, and does not require you to itemise.
Everything difficult about this provision lives above a taxable income threshold. Above it, businesses in specified service fields — consulting, law, accounting, health, financial services and others — see the deduction phase out, and other businesses become subject to limits based on wages paid and property held.
Below the threshold, none of that applies. There is no service business restriction, no wage test, no property test. A retired consultant with a pension and $35,000 of advisory profit is usually well beneath it, and qualifies as straightforwardly as a shopkeeper would.
02 Computing it
Qualified business income is not simply the profit on Schedule C. Two subtractions come first: the deductible half of self-employment tax, and any contribution you made to a self-employed retirement plan from that income.
So $35,000 of profit less roughly $2,500 of deductible self-employment tax leaves about $32,500 of qualified income, and the deduction is 20% of that — around $6,500, worth your marginal rate on it.
One further cap applies to everyone: the deduction cannot exceed 20% of your taxable income excluding net capital gains. For a household whose taxable income is low relative to business profit, that limit rather than the 20% is what decides the figure. Below the threshold the computation runs on Form 8995, which is a single short page.
Shows: the 20% deduction on qualified business income and what it is worth at your marginal rate. Ignores: the taxable income limit that can cap the deduction below 20%, the specified service phase-out, and any retirement plan contribution that reduces qualified business income.
Source: About Form 8995, Qualified Business Income Deduction Simplified Computation
03 The trade-off with sheltering the same income
Here is the interaction that catches people who read about each provision separately. A solo 401(k) or SEP contribution reduces qualified business income, and therefore reduces the 20% deduction computed from it.
Contribute $20,000 of a $32,500 qualified income to a solo 401(k) and the QBI deduction is computed on roughly $12,500 instead. You have not lost by doing it — the contribution shelters far more than the deduction gives up — but the two benefits are not additive, and a plan built on adding them together will overstate the result.
Which order suits you depends on the year. In a high-income year the plan contribution usually wins outright. In a low-income year, where the marginal rate is small and the taxable income cap may bind anyway, leaving more income exposed and taking the deduction can be the better arrangement — particularly if the space is wanted for something else, which is the same competition described in conversion strategy.
This is the most commonly missed deduction I encounter among people who left a salaried job and kept a foot in the door. The reason is almost always the same sentence, repeated everywhere: that consultants are excluded. They are, above a threshold that a part-time adviser will rarely approach. If you have business profit on a Schedule C and your taxable income is ordinary, work through Form 8995 before assuming the restriction applies to you. It is one page, and the answer is frequently several thousand dollars.
FAQ
Can a consultant claim the qualified business income deduction?
Yes, below the taxable income threshold. The restriction on specified service trades — which includes consulting — only applies once taxable income passes that threshold. Beneath it the type of business does not matter.
Do I have to itemise to claim it?
No. The deduction is taken on the return below adjusted gross income and is available whether you take the standard deduction or itemise. It is one of the few significant deductions that does not require itemising.
Does a solo 401(k) contribution reduce the deduction?
Yes. Contributions to a self-employed retirement plan reduce qualified business income, so the 20% is computed on a smaller figure. The contribution is still usually worth more than the deduction it costs, but the two benefits are not additive.
Sources
Regulator references
- Qualified business income deduction · Internal Revenue Service · 2025What qualifies, the income thresholds, and the specified service trade limitation.Last verified: 2026-09-07
- About Form 8995, Qualified Business Income Deduction Simplified Computation · Internal Revenue Service · 2025The simplified computation available below the threshold.Last verified: 2026-09-07
- Self-employed individuals tax center · Internal Revenue Service · 2025The business income the deduction is computed from.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.