QBI Deduction & Your S-Corp Salary Decision

Part of WageProof's complete guide to S-corp reasonable compensation.

The Section 199A qualified business income (QBI) deduction is one of the most significant tax benefits available to S-corp owners. It's also one of the biggest reasons the IRS is watching S-corp salaries more closely than ever. The deduction creates a direct financial incentive to pay yourself less, and the IRS knows it.

Key Takeaways

• The Section 199A QBI deduction (made permanent by the One Big Beautiful Bill Act, Pub. L. 119-21, in July 2025) lets eligible taxpayers deduct up to 20% of qualified business income.
• W-2 wages paid by an S-corp are excluded from QBI, so higher salary directly reduces your QBI deduction.
• But insufficient salary triggers IRS enforcement. Lower salary saves tax but raises audit risk — there's no free lunch.
• The W-2 wage limitation only bites above the 2026 taxable-income threshold of $201,750 (single) / $403,500 (married filing jointly). Above that range, paying yourself a higher salary can increase your QBI deduction.
• Reasonable compensation should be determined by market data first. QBI optimization comes second.

Quick refresher on the QBI deduction

Section 199A allows eligible taxpayers to deduct up to 20% of their qualified business income from pass-through entities, including S-corps. If your S-corp generates $200,000 in QBI and you qualify, that's a $40,000 deduction on your personal return. At a 24% marginal tax rate, that saves you $9,600 in federal income tax.

The deduction was originally set to expire after 2025. The One Big Beautiful Bill Act (Pub. L. 119-21, OBBBA), signed July 4, 2025, made it permanent. The rate stayed at 20% (an earlier proposal to raise it to 23% was dropped from the final bill). This matters for reasonable compensation planning because the QBI deduction is no longer a temporary benefit you might lose. That makes the salary-versus-QBI tension a permanent planning consideration.

OBBBA didn't just extend the deduction; it changed two mechanics that take effect for tax years beginning in 2026:

• Wider phase-in ranges. The range over which the W-2 wage limitation phases in was widened from $50,000 to $75,000 for single filers, and from $100,000 to $150,000 for joint filers (more on the threshold below).
• A new minimum deduction. OBBBA added Section 199A(i), a minimum deduction of $400 for any taxpayer with at least $1,000 of QBI from a qualified trade or business in which they materially participate. Both the $400 and $1,000 figures are inflation-adjusted after 2026. This mostly helps very small businesses; it doesn't change the salary-optimization analysis for a profitable S-corp.

Where the tension comes from

Here's the core conflict:

W-2 wages are excluded from QBI. When your S-corp pays you a salary, that salary reduces the company's qualified business income. More salary means less QBI. Less QBI means a smaller 20% deduction.

Run the numbers on a simple example. Your S-corp earns $250,000 in net income before your salary.

• If you pay yourself $80,000: QBI is $170,000. The 20% deduction is $34,000.
• If you pay yourself $120,000: QBI is $130,000. The 20% deduction is $26,000.

That's an $8,000 difference in the deduction. At a 24% tax rate, the higher salary costs you $1,920 in lost QBI tax benefit.

But you also need to compare that against the FICA savings. The $40,000 difference in salary means roughly $6,120 more in FICA taxes at the higher salary level (15.3% on $40,000). So the total cost of the higher salary is about $8,040 in this simplified example (FICA plus lost QBI benefit).

The math creates a clear incentive: pay yourself less, keep more as QBI, take the bigger deduction, and take the rest as distributions that aren't subject to FICA. The IRS sees exactly this pattern across millions of S-corp returns, and it's one of the primary reasons they've increased enforcement.

The complication: the W-2 wage limitation

The simple math above applies to taxpayers below the QBI income thresholds (in 2026, taxable income under $201,750 single / $403,500 joint). Once income climbs into and above the phase-in range, the picture flips.

Above certain income levels, the QBI deduction is limited. For tax year 2026, the threshold is $201,750 for single filers and $403,500 for married filing jointly (Rev. Proc. 2025-32, §2.26; these figures are adjusted for inflation every year). The limitation phases in over the next $75,000 of income for single filers and $150,000 for joint filers, then applies in full. Once it applies, the deduction can't exceed the greater of:

• 50% of 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

That formula is in Section 199A(b)(2)(B). For S-corp owners above these thresholds, paying yourself a higher salary can increase your QBI deduction because it raises the W-2 wage limitation.

Example: A high-income S-corp owner (taxable income well above the $403,500 joint threshold, so the limitation applies in full) has $400,000 in QBI but only $60,000 in W-2 wages. The 20% QBI deduction would be $80,000, but the 50% W-2 wage limitation caps it at $30,000 (50% of $60,000). If they raised their own salary to $120,000, the cap rises to $60,000. Even though the extra $60,000 of salary trims QBI to $340,000 (a $68,000 tentative deduction), the wage cap is still what binds, so the allowed deduction jumps from $30,000 to $60,000.

This is the opposite of the incentive for lower-income taxpayers. Above the threshold, higher salary can mean a bigger QBI deduction. Below the threshold, higher salary means a smaller one.

The point: there is no one-size-fits-all answer. The right salary depends on your specific income level, your QBI, your W-2 wages, and your marginal tax rate. This is exactly why the IRS rejects formula-based approaches. Every situation is different.

The right way to think about the tradeoff

Here's the order of operations. This matters because getting the sequence wrong can create real problems.

Step 1: Determine reasonable compensation based on market data. Start with what the IRS expects: a salary that reflects the market value of your services. Use BLS data. Match your actual duties to comparable occupations. Factor in your experience, your geography, and your hours. This produces a defensible range. See The Nine IRS Factors for what the IRS evaluates.

Step 2: Model the tax impact with your CPA. Once you have a defensible range (say, $85,000 to $115,000), run the QBI numbers with your CPA for different salary levels within that range. Look at the total tax picture: FICA, income tax, QBI deduction, and any state-level rules.

Step 3: Choose a supportable number within that range. Where you land inside the range should be grounded in your facts — your duties, your experience, and how the business performed relative to peers. Among the figures your analysis genuinely supports, tax considerations like QBI can inform which one you choose: if both $90,000 and $105,000 are supported by your market analysis and the QBI math favors $90,000, choosing the lower figure is reasonable. What's not reasonable is starting from a QBI-optimized number and then reverse-engineering a market justification after the fact.

The critical point is the sequence. Market data first. Tax optimization second. If you reverse the order, you're doing exactly what the IRS Fact Sheet warns against in factor #9: using a formula (or in this case, a tax optimization model) to determine compensation instead of market analysis.

Why this is not a set-it-and-forget-it calculation

Several variables in this equation change every year:

Your business changes. Revenue goes up or down. You take on new responsibilities or delegate old ones. You hire employees. You lose a major client. All of these affect what reasonable compensation looks like for your specific situation.

QBI thresholds adjust for inflation. The income levels where the W-2 wage limitation kicks in change annually. The 2026 threshold ($201,750 single / $403,500 joint) is higher than 2025's, and it will rise again next year. You might be below the threshold one year and above it the next.

BLS wage data updates annually. The market rate for your tasks shifts with new data. An analysis based on 2025 BLS data shouldn't be used to justify a 2027 salary without adjustment.

Tax rates and rules can change. While Section 199A is now permanent, other elements of the tax code (FICA rates, income tax brackets, state-level rules) can shift from year to year.

This is why reasonable compensation should be an annual exercise, not a one-time calculation. You set it once, document it, file it, and then revisit it next year with fresh data.

If you're using WageProof, the report is tied to a specific tax year and uses the most current BLS data available. Annual plans on the pricing page are designed for exactly this: running an updated report each year as part of your tax planning process.

What your CPA needs from you

If you're working with a CPA on this — and you should be, especially for the QBI optimization piece — here's what they need to advise you effectively:

A reasonable compensation analysis based on market data. This is what WageProof produces: a documented report with BLS data citations, methodology explanation, and a salary figure grounded in comparable market rates. It gives your CPA the defensible baseline to work from.

Your financial projections for the year. Estimated net income, expected distributions, and any major changes from the prior year. Your CPA needs this to model the QBI impact accurately.

Your current salary and distribution history. Where you've been matters. Dramatic year-over-year changes in the salary-to-distribution ratio raise flags. A gradual, documented adjustment is easier to defend than a sudden swing.

Your CPA brings the tax planning expertise. WageProof brings the market data and methodology documentation. Together, they produce a salary that's both defensible under IRS scrutiny and optimized for your total tax position.

The bottom line

The QBI deduction creates a real incentive to minimize your S-corp salary. The IRS knows this, and underpaid S-corp owner-employees are a long-standing enforcement priority (see why the IRS challenges S-corp salaries). The answer isn't to ignore the QBI benefit. It's to do the analysis in the right order: establish a defensible salary range based on market data first, then optimize within that range for tax efficiency.

You can run a reasonable compensation report in about 15 minutes. The report gives you and your CPA a documented starting point for the salary conversation, grounded in the same BLS data the IRS uses. From there, your CPA can model the QBI implications and help you land on the right number.