The QBI Deduction Explained: How to Claim Your 20% Pass-Through Deduction

What Is the QBI Deduction?

The Qualified Business Income (QBI) deduction — formally called the Section 199A deduction — was created by the Tax Cuts and Jobs Act of 2017 and took effect January 1, 2018. It was designed to give pass-through business owners a tax break comparable to the corporate rate reduction that C-corporations received under the same law.

In plain terms: if you own a pass-through business, you may be able to deduct up to 20% of your qualified business income from your taxable income — without spending a dollar or making any investment to claim it. It is a pure paper deduction that reduces your tax bill on every dollar of eligible income.

As of 2025, this deduction is still active. It is currently scheduled to expire after December 31, 2025 unless Congress extends it — which makes 2025 a critical year to make sure you are capturing it in full.

Who Qualifies?

The QBI deduction applies to pass-through business entities — businesses where income flows through to the owner's personal tax return. That includes:

• Sole proprietors (Schedule C filers)
• Single-member LLCs taxed as sole proprietors
• Multi-member LLCs taxed as partnerships
• S-corporation owners
• Partnership members
• Certain trusts and estates with qualifying business income

C-corporations do not qualify. Their income is taxed at the entity level, not passed through to owners, so Section 199A does not apply to them.

Employees also do not qualify — W-2 wages are not considered qualified business income, no matter how high the salary. This deduction is exclusively for business owners reporting self-employment or pass-through income.

The Basic QBI Calculation

Before applying any income limits or wage tests, the core formula is straightforward:

Qualified Business Income is your net business income from eligible trade or business activities. It excludes: W-2 wages you pay yourself, capital gains or losses, dividends, interest income not earned in the ordinary course of business, and certain foreign income.

The "lesser of" test prevents the deduction from exceeding your total taxable income. If your QBI is $200,000 but your taxable income after all deductions is only $80,000, you calculate the deduction based on $80,000 — not $200,000.

Simple Example at $100,000 QBI

Here's what the deduction looks like for a typical small business owner:

2025 Income Limits and Phase-Out Thresholds

The QBI deduction is not unlimited. Congress imposed income thresholds above which the deduction begins to phase out or becomes subject to a wage test. Here are the 2025 figures:

Below the Threshold — Full Deduction, No Restrictions

If your taxable income (not gross income) is below these amounts, you get the full 20% deduction with no strings attached:

• Single / Head of Household / MFS: below $191,950
• Married Filing Jointly: below $383,900

Below these thresholds, it does not matter what type of business you own, how many employees you have, or what assets you hold. 20% of QBI is your deduction — period.

Phase-Out Zone — Partial Deduction

If your taxable income falls in the following ranges, your deduction begins to phase out and the W-2 wage limitation starts to apply proportionally:

• Single: $191,950 – $241,950 (phase-out range: $50,000)
• Married Filing Jointly: $383,900 – $483,900 (phase-out range: $100,000)

Within this zone, the extent to which the wage limitation applies is determined by how far through the phase-out range your income falls. At the bottom of the range you are almost fully protected; at the top of the range the wage test applies fully.

Above the Phase-Out — W-2 Wage Test Applies in Full

Once your taxable income exceeds $241,950 (single) or $483,900 (MFJ), the full W-2 wage limitation applies. Your deduction is limited to the greater of these two calculations:

This test rewards business owners who pay W-2 wages (to employees or to themselves via S-corp salary) and who hold significant depreciable property. It is also why the S-corp structure becomes especially powerful at higher income levels.

Specified Service Trade or Business (SSTB) — The Big Exclusion

There is one major carve-out in the QBI deduction rules: Specified Service Trades or Businesses (SSTBs). If your business qualifies as an SSTB, the deduction phases out entirely at the same income thresholds described above — meaning above $241,950 (single) or $483,900 (MFJ), you receive no deduction at all.

What Counts as an SSTB?

The IRS defines SSTBs as businesses where the principal asset is the reputation or skill of its employees or owners. The statutory list includes:

• Health (doctors, dentists, nurses, veterinarians)
• Law (attorneys, paralegals)
• Accounting (CPAs — but not bookkeeping services)
• Actuarial science
• Performing arts
• Consulting
• Athletics
• Financial services and brokerage (investment advisers, financial planners)
• Investing and investment management
• Trading in securities, commodities, or partnership interests

What Is NOT an SSTB

Notably excluded from the SSTB list — meaning these businesses can claim the full QBI deduction regardless of income (subject only to the wage test above thresholds):

If you are an SSTB owner with income below the thresholds, you still get the full 20% QBI deduction. The SSTB designation only becomes a problem above the phase-out range.

The S-Corp Interaction: How Your Salary Affects QBI

This is where many business owners make costly mistakes — or miss major opportunities.

When you elect S-corp status and pay yourself a W-2 salary, that salary reduces your QBI — because W-2 wages paid to yourself are not counted as qualified business income. At first glance, this sounds like a disadvantage. In practice, it creates two benefits:

1. Below the income thresholds: Reducing QBI via a reasonable salary has minimal downside because you still get the deduction on all remaining QBI. The payroll tax savings from an S-corp election often far outweigh any slight reduction in the QBI deduction amount.
2. Above the income thresholds: Paying yourself a W-2 salary helps you meet the W-2 wage test. Remember — the deduction above the threshold is limited to 50% of W-2 wages. An owner who pays themselves a $120,000 salary can generate up to $60,000 in deductible QBI using that formula, whereas a sole proprietor paying no W-2 wages might receive nothing.

This is why the S-corp election and QBI planning must be done together, not in isolation. The right salary amount depends on your total income level, business structure, and how close you are to the phase-out thresholds.

The Aggregation Election: Combining Multiple Businesses

If you own multiple businesses, the IRS allows you to make an aggregation election — treating them as a single enterprise for purposes of the QBI deduction. This is particularly valuable for business owners whose individual entities might not meet the W-2 wage test on their own, but whose combined operations do.

To aggregate, the businesses must:

• Share at least 50% common ownership (directly or indirectly)
• Have the same tax year
• Meet at least two of three integration tests (same customers/suppliers, share facilities/property, or share employees/services)
• None of the businesses can be an SSTB (if any one is, it taints the aggregation)

Once made, the aggregation election must generally be reported consistently in future years. This is a planning decision that should be made with a tax professional — it cannot be casually opted in and out of.

Side-by-Side: $180K vs. $250K Income Comparison

North Carolina Conformity

For NC-based business owners: North Carolina conforms to the federal QBI deduction. The deduction flows from your federal adjusted gross income onto your NC state return, reducing your NC taxable income at the same time. With NC's current flat individual income tax rate, every dollar of QBI deduction you claim reduces both your federal and state tax bill simultaneously.

This makes the QBI deduction even more valuable for NC small business owners — you are stacking federal and state savings from a single deduction.

Advanced Planning Strategies to Maximize Your QBI Deduction

1. Manage Taxable Income Below the Thresholds

The cleanest way to guarantee the full QBI deduction is to keep your taxable income below $191,950 (single) or $383,900 (MFJ). Tools that help include: maximizing retirement contributions (SEP-IRA, Solo 401k, SIMPLE IRA), maximizing HSA contributions, accelerating deductible expenses into the current year, and timing income recognition strategically. Every dollar of taxable income you legitimately reduce through these methods also protects your full QBI deduction.

2. Maximize Depreciation to Increase Qualified Property Basis

Above the income thresholds, the W-2 wage test allows you to add 2.5% of the unadjusted basis of qualified property to your deduction calculation. This makes bonus depreciation and Section 179 elections doubly valuable — they reduce your current-year taxable income and increase the property basis that feeds into the alternative W-2 wage test calculation. Equipment purchases, leasehold improvements, and eligible business property all qualify.

3. Use the Aggregation Election Strategically

If you own multiple non-SSTB businesses, run the math on aggregation. One business might have strong W-2 wages but modest profit. Another might have high profit but few employees. Combining them under an aggregation election could unlock a larger deduction than either business achieves separately.

4. Structure the S-Corp Salary Correctly

If you are near or above the income thresholds, your S-corp officer salary is not just a payroll tax issue — it directly controls your W-2 wage test outcome. Too low a salary and you fail the wage test above the threshold. Too high a salary and you unnecessarily reduce QBI. The optimal salary is a precise calculation, not a guess. This is one area where professional planning pays for itself multiple times over.

5. Review SSTB Status Before Year-End

If your business sits near the edge of SSTB classification (for example, a consulting firm that also sells software products, or a financial firm that offers non-advisory services), there may be structuring options that allow you to separate SSTB and non-SSTB revenue streams. The non-SSTB revenue could then qualify for the deduction even when the SSTB portion does not.

Common QBI Deduction Mistakes to Avoid

• Not claiming it at all — Many sole proprietors and LLC owners simply don't know the deduction exists or assume they don't qualify. This is by far the most expensive mistake.
• Using gross revenue instead of net income — QBI is based on net business income after expenses, not top-line revenue. Using gross revenue overstates the deduction and will trigger IRS scrutiny.
• Including W-2 wages in QBI — If you pay yourself a salary as an S-corp owner, that salary comes out of QBI before the 20% is calculated. Software often handles this automatically, but manual filers frequently get it wrong.
• Ignoring the taxable income cap — If your QBI deduction would exceed your total taxable income minus capital gains, it must be reduced. This often affects business owners with large above-the-line deductions.
• Failing to make the aggregation election — Multi-business owners who would benefit from aggregation often miss it because their preparer isn't aware of all their business interests.
• Assuming SSTB status eliminates the deduction entirely — SSTB owners below the income thresholds still get the full 20% deduction. The SSTB classification only matters above $191,950 / $383,900.
• Not planning ahead for the phase-out zone — Owners who land in the $191,950–$241,950 range with no planning often receive a partial deduction when a few strategic moves (retirement contributions, timing) could have locked in the full amount.

QBI Deduction Checklist for 2025

The Bottom Line

The QBI deduction is one of the most significant tax breaks available to small business owners — and one of the most frequently missed. If your pass-through business has any meaningful profit and your taxable income falls below $191,950 (single) or $383,900 (MFJ), you almost certainly qualify for the full 20% deduction with zero additional planning required.

Above those thresholds, the deduction does not disappear — it just requires intentional structuring around W-2 wages, qualified property, and potentially business entity type. That is where a tax strategist earns their fee many times over.

The deduction is currently set to expire after 2025. Whether Congress extends it or not, the 2025 tax year represents your last confirmed opportunity to capture it in its current form. Don't leave $4,000–$12,000 on the table because a form wasn't filed correctly.