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The QBI Deduction for Mechanics: Up to 20% Off Your Business Income (2026)

Updated 2026-10-17. Sources are listed at the end.

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This is general information, not legal or tax advice. Rules vary by state and change often. Confirm with the official source linked in each section, or with a licensed attorney, CPA or insurance agent, before you act.

If you run your repair business as a sole proprietorship, partnership or S corporation, you may be able to deduct up to 20% of your qualified business income on your federal return. It’s one of the biggest tax breaks available to small operators, and many first-year filers miss it.

The basics, from the IRS

What it doesn’t do

The QBI deduction does not reduce self-employment tax. The IRS FAQ says it doesn’t reduce net earnings from self-employment (IRS 199A FAQ, Q18). It lowers income tax only. So your quarterly estimates still need to cover the full 15.3% SE tax.

Also, QBI is net of related deductions. The IRS says it’s reduced by items like the deductible part of SE tax, self-employed health insurance, and retirement plan contributions (SEP, SIMPLE, qualified plans).

2026 income thresholds

Below these taxable-income levels, the extra limits (the type of business, W-2 wages paid, and property) don’t apply. Above them they phase in, and above the top of the range they apply fully. For 2026 (from IRS Rev. Proc. 2025-32):

Filing statusThresholdPhase-in range ends
Married filing jointly$403,500$553,500
Married filing separately$201,775—
All other returns$201,750$276,750

(Rev. Proc. 2025-32, PDF)

Most solo mobile mechanics are well under these numbers. For them the deduction is roughly 20% of net business income (after the adjustments above), limited by taxable income.

Is auto repair a “specified service” business?

Above the threshold, a specified service trade or business (SSTB) gets less or no deduction. The IRS lists the SSTB fields as health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, investing and investment management, trading, dealing in certain assets, and businesses whose main asset is the reputation or skill of employees or owners (IRS 199A FAQ).

Auto repair is not on that list. The “reputation or skill” category is defined in the Section 199A regulations, and it doesn’t simply mean any skilled trade. Under the threshold the SSTB question doesn’t matter. If you’re near or above it, have a tax professional confirm how it applies to you.

New for 2026: a minimum deduction

For tax years beginning after 2025, the IRS describes a new minimum deduction for active qualified business income. Under § 199A(i), a taxpayer with at least $1,000 of QBI from active businesses in which they materially participate gets a deduction of at least $400 (IRS, QBI deduction; Rev. Proc. 2025-32). It mostly matters for part-time or first-year operators with small profits.

Example (illustration only)

A single mobile mechanic has $70,000 of Schedule C profit. The deductible half of SE tax and self-employed health insurance together reduce QBI to about $60,000. Taxable income is under the threshold and isn’t the limiting factor. The QBI deduction is about 20% × $60,000 = $12,000, which reduces taxable income but not SE tax. Run your own numbers through tax software or with a preparer.

Does an LLC or S corp change it?

A single-member LLC taxed as a sole proprietorship qualifies the same way. With an S corp, the wages you pay yourself are not QBI, which changes the math. See LLC vs sole proprietor and talk to a tax professional before electing S corp status.

Sources