Every year you sign a check to the IRS and wonder if you’re doing this right.

You’ve read the “LLC vs S-Corp” articles. They all say the same thing: elect S-Corp status and save on self-employment tax. Then they stop. No numbers. No mention of the salary decision that silently compresses your QBI deduction. No warning about the situations where the whole thing backfires.

This post does the actual math. By the end, you’ll know the profit threshold where switching pays off, how to set your salary without triggering IRS attention, and three situations where an S-Corp is the wrong call entirely.

LLC vs S-Corp Tax Election in 2026: What Actually Changes

Why your LLC is bleeding 15.3% off the top

When you run a sole proprietorship or single-member LLC, every dollar of net profit counts as self-employment income. That means it gets hit with SE tax before your regular income tax even starts:

12.4% Social Security tax on the first $184,500 of net earnings
2.9% Medicare tax on everything, with no ceiling
0.9% Additional Medicare surtax above $200,000 (single) or $250,000 (married filing jointly)

Below the Social Security wage base, the combined rate is 15.3%. You can deduct half of SE tax from gross income, which softens it a little. But you’re still sending roughly 14 cents of every dollar straight to FICA before your tax bracket kicks in.

At $150,000 in net profit, that’s over $21,000 in SE tax. That’s real money worth optimizing.

How does an S-Corp actually reduce your tax bill?

An S-Corp does not eliminate your FICA obligation. It restructures it.

You become a W-2 employee of your own corporation. You pay yourself a salary. FICA applies only to that salary. Everything above the salary is paid out as a pass-through distribution, which is not subject to FICA at all. Those distributions are also taxed at lower capital gains rates in some scenarios, which is a separate layer of planning covered in the Capital Gains Tax Strategy guide.

Here’s what that looks like at $200,000 in net profit:

Structure	FICA Base	Tax Paid
Sole Prop or LLC	$200,000	~$22,600
S-Corp ($80k salary)	$80,000	~$12,240
Gross FICA savings		~$10,360

The wider the gap between your salary and your total distributions, the more you save. That gap is also where the IRS focuses its attention.

What does the IRS consider a “reasonable salary”?

This is where most indie founders get nervous, and for good reason. The IRS requires shareholder-employees to receive compensation “reasonable for the services performed.” Set your salary at $20,000 to maximize distributions and you’re inviting scrutiny.

The benchmarks that actually hold up under audit:

Bureau of Labor Statistics median wage data for your occupation and region
What you would pay a contractor or employee to do the same work
Your billable rate, hours worked, and the local market for your skills

A software contractor billing $350,000 a year can defend a $120,000 to $150,000 salary. $35,000 is not defensible, and the IRS knows the difference.

Not sure where your current setup lands on the risk spectrum? The IRS Audit Risk Matrix scores your audit exposure across 9 factors so you know what you’re working with before you restructure.

A higher salary gives you better audit protection. It also has two other effects, one positive and one negative, that most guides ignore entirely.

The QBI deduction problem nobody warns you about

If your business qualifies as a pass-through entity, you may be eligible for the Section 199A Qualified Business Income deduction: 20% off your qualifying business income. On paper it sounds great. Here’s the problem.

The deduction is calculated as the lesser of:

20% of QBI (net profit minus your salary)
50% of W-2 wages paid

At $200,000 profit with an $80,000 salary:

QBI = $120,000, so 20% of QBI = $24,000
50% of W-2 wages = $40,000
Your deduction: $24,000

At $200,000 profit with a $140,000 salary:

QBI = $60,000, so 20% of QBI = $12,000
50% of W-2 wages = $70,000
Your deduction drops to $12,000

Pushing your salary up for better audit protection quietly cuts your QBI deduction in half. At a 24% marginal rate, that difference in deduction is worth roughly $2,880 in income tax. Your salary decision does not just affect FICA. It affects your QBI deduction. You have to model both at the same time.

How your salary caps your Solo 401(k) contributions

There’s a third factor that almost nobody mentions: how your salary sets the ceiling on your Solo 401(k) contributions.

For 2026, the Solo 401(k) limits are:

Employee elective deferral: up to $24,500 ($32,000 if you’re 50 or older), drawn from W-2 wages
Employer profit-sharing: up to 25% of W-2 compensation
Total combined limit: $72,000 ($79,500 if 50+)

At an $80,000 salary:

Max employee deferral: $24,500
Max employer contribution: $20,000 (25% of $80k)
Total: $44,500

At a $140,000 salary:

Max employee deferral: $24,500
Max employer contribution: $35,000 (25% of $140k)
Total: $59,500

That’s $15,000 more in tax-sheltered retirement savings from the higher salary. If you’re in the 24% or 32% bracket, that extra room has real dollar value, and it can partially or fully offset the FICA you gave up.

The “right” salary is not a simple compliance question. It’s an optimization across three things at once: FICA exposure, QBI deduction, and retirement contribution headroom.

What profit level actually justifies switching to an S-Corp?

The common rule of thumb is $60,000 to $80,000 in net profit. Below that, fixed overhead eats the savings.

Annual S-Corp overhead runs roughly:

Payroll service (Gusto, QuickBooks Payroll): $600 to $1,200 per year
Payroll tax filing (Forms 940 and 941): included or $300 to $500 extra
State S-Corp registration and annual fees: $300 to $2,000+ depending on state
Separate business tax return (Form 1120-S): $500 to $1,500 in CPA fees

Total: approximately $1,500 to $5,200 per year just to keep the structure running.

One thing worth noting: all of these are deductible business expenses. At a 24% marginal rate, a $3,000 overhead bill costs you closer to $2,280 after the deduction. That softens the math a little, but it doesn’t change the breakeven logic.

At $60,000 in profit with a $45,000 salary, your FICA savings are around $2,300. Overhead alone may eat most of that, and the QBI compression likely takes the rest.

At $150,000 in profit with an $85,000 salary, FICA savings land around $9,900. Overhead is roughly 15% to 20% of gross savings. The math works clearly.

Three situations where an S-Corp election is the wrong move

Not every freelancer or indie founder should make this switch. Be careful if:

Income is highly variable. If you clear $180,000 one year and $50,000 the next, you’ll pay S-Corp overhead in the slow years with nothing to offset it.

You operate in California, New York, or New Jersey. California charges an $800 minimum franchise tax plus 1.5% of net income. That neutralizes a significant chunk of federal FICA savings for many founders at mid-range profit levels. Run your state numbers separately before assuming the math works.

You’re applying for an SBA loan or mortgage. S-Corp distributions show up differently on loan applications than self-employment income. A sole prop reporting $130,000 in net profit often looks better to a lender than an S-Corp showing an $80,000 salary plus $50,000 in distributions.

You hold investment real estate inside your business. S-Corps cannot take advantage of 1031 like-kind exchanges the same way individual investors can. If real estate is part of your picture, run the 1031 Exchange Calculator before deciding how your entity structure interacts with your property strategy.

What to actually calculate before you make this decision

The five inputs that determine whether the switch makes sense for you:

Net business profit, current and projected for the next two to three years
Proposed reasonable salary
Filing status (affects the Section 199A phase-out above $383,900 for married filers in 2026)
State of operation
Whether you’re approaching the Social Security wage base ($184,500 in 2026)

If your net profit is above $80,000 and you have not run your specific numbers, you’re likely leaving real money on the table. The calculator below lets you input your situation and see FICA savings, QBI impact, and retirement headroom side by side using 2026 IRS figures.

Run the S-Corp vs LLC Tax Calculator with your 2026 numbers

Run the numbers before you sit down with your CPA. You’ll have a much sharper conversation.

This content is for educational purposes only. It is not legal or tax advice. Consult a qualified tax professional before making structural changes to your business.