Section 199A lets pass-through business owners deduct up to 20% of business income — but income thresholds and service-business rules cap the benefit.
The Qualified Business Income (QBI) deduction under Section 199A lets most pass-through business owners — sole proprietors, S-corps, partnerships — deduct up to 20% of net business income from taxable income. The deduction reduces income tax only, not self-employment tax. Income limits and service-business exclusions determine how much you can actually claim.
The Qualified Business Income (QBI) deduction, created by Section 199A of the Internal Revenue Code, lets eligible business owners deduct up to 20% of their net business income from taxable income. For a sole proprietor netting $100,000 on Schedule C, that can mean a $20,000 reduction in taxable income — without any additional expense.
The mechanics have important constraints: income limits, a list of excluded service businesses above the threshold, and wage limitations that kick in for high earners. Overclaiming it or not claiming it at all are both common errors among self-employed owners.
IRS guidance on the QBI deduction is the authoritative reference. This guide explains how the deduction works and where it most affects your 2026 return.
The deduction is available to owners of pass-through entities — businesses whose income flows to the owner’s personal tax return:
The deduction does not apply to C corporations, W-2 employees, or hobby income that doesn’t meet the IRS definition of a trade or business.
QBI is your net income from a qualified trade or business conducted within the United States, after allowable deductions. It specifically excludes:
If your business had a net loss, that negative QBI carries forward to reduce QBI in the next tax year — it doesn’t disappear.
The deduction works differently depending on where your total taxable income falls.
Zone 1 — Below the threshold
For 2025, the thresholds were $197,300 for single filers and $394,600 for married filing jointly. The IRS adjusts these annually for inflation; verify the current year’s figure at irs.gov/newsroom/qualified-business-income-deduction before filing.
Below the threshold, the calculation is straightforward: 20% × QBI, capped at 20% of your overall taxable income. Most sole proprietors and small business owners fall here and claim the full deduction without restriction.
Zone 2 — Inside the phase-out range
The phase-out band runs $50,000 above the threshold for single filers ($100,000 for MFJ). Inside this range, specified service business deductions begin phasing out, and W-2 wage limitations start phasing in for other businesses.
Zone 3 — Above the phase-out range
For specified service businesses, the deduction disappears entirely. For all other businesses, the deduction is limited to the greater of:
A high-income sole proprietor with no employees and no qualified property can face a limitation that eliminates the deduction above the threshold — a common planning gap for single-owner businesses.
The IRS designates certain professions as “specified service trades or businesses” that lose the deduction once income exceeds the threshold. SSTB categories include:
Two notable exceptions: engineering and architecture are not SSTBs — they remain QBI-eligible regardless of income level.
This is the most common misunderstanding about Section 199A. The QBI deduction reduces income tax only — it does not touch your self-employment tax.
If you’re a sole proprietor, your self-employment tax (15.3% on the first $176,100 of net SE income in 2025, with the Medicare-only rate applying above that) is calculated on Schedule C net income before the QBI deduction. The deduction arrives later on Form 1040, reducing your taxable income — but by that point, SE tax is already calculated and fixed.
Several strategies commonly used by self-employed owners affect your QBI directly:
The IRS provides two forms for calculating the deduction:
Both forms feed into Line 13 of Form 1040, where the final deduction amount reduces your taxable income.
Lenders reviewing your business loan application typically use your Schedule C net income or K-1 income — the same figure the QBI deduction starts from. Business deductions (home office, depreciation, retirement contributions) reduce taxable income, which is the goal, but they also reduce the income figure lenders use to underwrite your borrowing capacity.
This is the tradeoff self-employed owners navigate: maximizing deductions for tax purposes while preserving documented income for funding applications. Understanding which deductions affect your lender-visible income and how to present the full picture — including add-backs lenders sometimes allow for depreciation — can affect your funding options.
If you’re a sole proprietor or S-corp owner considering business funding, start an application at ClearValue Lending — your documented income and business profile drive both your QBI calculation and your funding eligibility.
No. The QBI deduction is available only to business owners, not employees. W-2 income is not qualified business income under Section 199A. A person who both owns a business and earns W-2 wages from an employer can claim QBI on their business income only — the employee wages do not count toward the deductible amount.
No. Self-employment tax is calculated on net earnings from self-employment before the QBI deduction is applied. The deduction reduces income tax only — it appears on Form 1040 after the SE tax calculation. This is one of the most common misconceptions about Section 199A.
A net loss creates negative QBI. The IRS requires you to carry that negative QBI forward to the next tax year, where it reduces that year's QBI before you calculate the deduction. You cannot use a QBI loss to create or increase a refund in the current year.
Consulting is classified as a specified service trade or business (SSTB). If your taxable income exceeds the full phase-out level (~$247,300 single for 2025 figures), you lose the QBI deduction entirely. If your income falls within the phase-out range, you may qualify for a partial deduction. Consult the Form 8995-A instructions at irs.gov for the calculation.
No. A plain sole proprietorship with no formal entity qualifies. If you file Schedule C, you can claim the QBI deduction. The entity type (LLC, S-corp, partnership) affects other tax considerations but does not determine eligibility for Section 199A.