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Tax

Qualified business income deduction

A deduction of up to 20% of qualified business income, available to owners of pass-through businesses.

Also called QBI, Section 199A, pass-through deduction.

It is a deduction against taxable income rather than an expense of the business, so it does not reduce self-employment tax and does not appear on Schedule C. It comes off later, on the personal return.

Above an income threshold the deduction is limited by the kind of work the business does and by its wages and property. Specified service trades (health, law, accounting, consulting, athletics, financial services and others) phase out entirely above the upper threshold.

It applies to sole proprietorships, partnerships and S-corps alike. It does not apply to wages, including the wages an S-corp pays its own owner.