The QBI Deduction (Section 199A) Explained

If you own a small business, run a freelance practice, or earn income through a partnership or S corporation, the QBI deduction could be one of the most valuable tax breaks available to you. Created by the Tax Cuts and Jobs Act of 2017, the qualified business income deduction (also called the Section 199A deduction) can reduce the federal tax you owe on your business profits by a meaningful amount, yet many owners either miss it entirely or claim it incorrectly. This guide explains how it works, who qualifies, and how to plan around it.

The QBI deduction lets eligible owners of pass-through businesses deduct up to 20% of their qualified business income from taxable income. It applies to sole proprietors, partnerships, S corporations, and some trusts, subject to taxable-income thresholds, wage and property limits, and rules for service businesses.

What the QBI deduction (Section 199A) is

The qualified business income deduction is a federal tax deduction that reduces the amount of business profit subject to income tax. Instead of lowering your tax rate, it lowers the income the rate is applied to. In broad terms, a qualifying owner can deduct up to 20% of their qualified business income, plus up to 20% of qualified REIT dividends and publicly traded partnership income, with the total capped at 20% of taxable income (less net capital gains).

Qualified business income means the net of income, gains, deductions, and losses from a qualified trade or business carried on inside the United States. It does not include items such as capital gains and losses, certain dividends, interest income not properly allocable to the business, or reasonable compensation paid to an S corporation owner. The deduction is taken on your individual return and does not reduce your self-employment tax or adjusted gross income; it reduces taxable income only.

Importantly, the Section 199A deduction is scheduled to sunset. Under current law it applies to tax years beginning before January 1, 2026, and is set to expire for later years unless Congress extends or modifies it. Because legislation can change, always confirm the current status and figures on IRS.gov before relying on it.

Who qualifies: pass-through businesses

The deduction is designed for owners of pass-through entities, where business profits “pass through” to the owner’s personal return rather than being taxed at the entity level. Eligible structures generally include:

Sole proprietorships (reported on Schedule C)
Single-member LLCs taxed as sole proprietorships
Partnerships and multi-member LLCs taxed as partnerships
S corporations
Certain trusts and estates
Some rental real estate activities that rise to the level of a trade or business

C corporations do not qualify, because they are taxed separately at the corporate level and already benefit from a flat corporate rate. Wages you earn as an employee are not qualified business income either. Choosing the right structure is a foundational decision, and the QBI deduction is one of several factors that can tip the analysis. If you are weighing your options, our guidance on business structure can help frame the trade-offs.

The up-to-20% basics

At its simplest, the QBI deduction equals 20% of your qualified business income. If your business produced $100,000 of qualified business income and no limits applied, the deduction would be $20,000, reducing the income you pay tax on. The overall deduction can never exceed 20% of your taxable income calculated before the QBI deduction and after subtracting net capital gains.

For owners whose taxable income falls below the relevant threshold for the year, the calculation is usually this straightforward 20% figure. Above the threshold, additional limits and tests apply, which is where the rules become more involved. Because the deduction interacts with your total taxable income, it sits squarely within broader tax planning decisions such as retirement contributions and timing of income.

Taxable-income thresholds and phase-outs

The mechanics of the QBI deduction change depending on your taxable income. There is a lower threshold below which the simple 20% rule applies regardless of your line of work, and a phase-in range above it over which the wage and property limits (and the service-business restrictions) gradually take effect. Once your taxable income exceeds the top of that range, the limits apply in full.

These threshold amounts are indexed for inflation and therefore change every tax year, with separate figures for single filers and those married filing jointly. Because they move annually, this article does not state a specific dollar amount; you should look up the current-year thresholds for your filing status on IRS.gov or confirm them with your accountant. The key point to understand is the structure: below the threshold the deduction is simple, within the phase-in range it is partially limited, and above the range the full set of restrictions applies.

SSTB limits for specified service businesses

A “specified service trade or business,” or SSTB, faces an extra restriction. SSTBs include fields where the principal asset is the reputation or skill of the owners or employees, such as health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, and investing or investment management.

If your taxable income is below the threshold for the year, you can claim the QBI deduction even if you operate an SSTB. Within the phase-in range, the deduction for an SSTB is gradually reduced. Once your taxable income rises above the top of the range, an SSTB generally cannot claim the deduction at all. This makes managing taxable income especially important for high-earning professionals in service fields. Engineering and architecture are notably excluded from the SSTB definition, so they are treated as ordinary qualified businesses.

The W-2 wage and UBIA limit

For owners above the taxable-income threshold who are not in an SSTB, the deduction is capped by a wage-and-property test. The deduction for each business is limited to the greater of:

50% of the W-2 wages paid by the business, or
25% of W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition (UBIA) of qualified property the business holds.

UBIA generally refers to the original cost of depreciable tangible property, such as buildings and equipment, still within its depreciable life. This limit rewards businesses that pay wages or invest in physical assets. It is also why some S corporation owners review their reasonable compensation: the wages a business pays can directly affect the size of the allowable QBI deduction once you are above the threshold. The limit phases in across the same income range described above, rather than switching on all at once.

How to claim the QBI deduction

Most taxpayers claim the deduction using IRS Form 8995 if their taxable income is at or below the threshold for the year, which is the simplified form. If income exceeds the threshold, or the business is an SSTB or involves a more complex situation, you use Form 8995-A and its schedules instead, which walk through the wage, property, and SSTB tests business by business.

The deduction is reported on your Form 1040 and reduces taxable income. Pass-through entities typically report the information you need (qualified business income, W-2 wages, and UBIA figures) on a Schedule K-1. Keep clean records of each business’s income, the wages it pays, and the basis of qualified property, because these numbers drive the calculation. For the official instructions and current forms, see IRS.gov.

Planning to maximize the QBI deduction

Because so much depends on taxable income, thoughtful planning can protect or increase the deduction. Common strategies, all of which should be evaluated with a professional for your specific facts, include:

Managing taxable income below a threshold through retirement plan contributions, health savings account contributions, or timing of income and deductions.
Reviewing S corporation compensation so that reasonable wages support the wage limit without overpaying payroll taxes.
Aggregating businesses where the rules permit, which can combine wages and property to satisfy the limits more easily.
Reconsidering entity choice, since the deduction can influence whether a pass-through or a different structure is more efficient.
Investing in qualified property, where it makes business sense, to benefit from the 2.5% UBIA component.

Given the scheduled 2026 sunset, it is also wise to revisit your plan each year so you are not caught out by a change in the law.

A worked example with placeholders

Suppose [BUSINESS_NAME], a single-member consulting LLC owned by [OWNER_NAME], generates [QBI_AMOUNT] of qualified business income in a given tax year. If [OWNER_NAME]’s total taxable income is below the threshold for that year, the QBI deduction is simply 20% of [QBI_AMOUNT], or [DEDUCTION_AMOUNT], assuming it does not exceed 20% of taxable income.

Now suppose taxable income rises above the threshold. Because consulting is an SSTB, the deduction would begin to phase out and could disappear entirely above the top of the range. If instead the business were a non-service company, the wage-and-property limit would apply: with [W2_WAGES] in W-2 wages, the deduction could be capped at the greater of 50% of those wages or 25% of wages plus 2.5% of UBIA. These placeholder figures illustrate the mechanics only; your actual numbers and the current-year thresholds must be confirmed for your situation.

Mistakes to avoid

Assuming you automatically get the full 20%. Above the threshold, wage, property, and SSTB limits can sharply reduce or eliminate it.
Forgetting it reduces taxable income, not AGI or self-employment tax. The deduction does not lower your self-employment tax bill.
Misclassifying an SSTB. Getting the activity type wrong can lead to claiming a deduction you are not entitled to.
Ignoring reasonable compensation rules for S corporations, which affect both payroll tax and the wage limit.
Using last year’s thresholds. The figures are inflation-adjusted annually, so always use the current tax year’s numbers from IRS.gov.
Overlooking the sunset. Plan with the scheduled expiration in mind rather than assuming the deduction is permanent.

Frequently asked questions

Who can claim the QBI deduction?

Owners of pass-through businesses, including sole proprietors, partners, S corporation shareholders, and certain trusts and estates, may claim the QBI deduction if they have qualified business income from a U.S. trade or business and meet the applicable income and limit tests for the tax year.

Is the qualified business income deduction the same as Section 199A?

Yes. “QBI deduction,” “qualified business income deduction,” and “Section 199A deduction” all refer to the same provision created by the Tax Cuts and Jobs Act, named after the section of the Internal Revenue Code that authorizes it.

Does the QBI deduction reduce my self-employment tax?

No. It reduces your federal taxable income for income tax purposes only. Your self-employment tax is calculated separately on your net earnings and is not affected by this deduction.

Can a specified service business still claim the deduction?

It depends on taxable income. Below the year’s threshold, an SSTB can claim the full deduction. Within the phase-in range it is reduced, and above the top of the range an SSTB generally cannot claim it at all.

Is the deduction permanent?

No. Under current law, the Section 199A deduction is scheduled to expire for tax years beginning after December 31, 2025, unless Congress acts to extend or modify it. Confirm the current status on IRS.gov.

Book a free consultation

The QBI deduction can save business owners thousands, but the thresholds, phase-outs, and service-business rules make it easy to get wrong, and the figures change every year. Tranzesta’s US and UK tax specialists can review your structure, run the numbers for the current tax year, and build a plan that protects your deduction. Book a free consultation and let us help you keep more of what you earn.

Disclaimer: This article is for general informational purposes only and does not constitute tax, legal, or financial advice. Tax laws, thresholds, and the Section 199A deduction itself change over time and depend on your individual circumstances. Always verify current figures on IRS.gov and consult a qualified professional before acting.