Most people treat this decision like a legal question. It’s not. It’s a tax question wearing a legal costume, and mixing those two things up will cost you.

I’ll be honest: when I started helping small business owners with their entity structures back in the mid-2000s, I used to default to “just form an LLC” like it was the universal right answer. Then I started running the actual numbers side-by-side for clients, and what surprised me was how often the S corp election added up to real, meaningful savings for businesses in a certain revenue range. Not always. Not automatically. But often enough that I completely changed how I talk about this.

So let me give you the real story.

What You Actually Have to Understand First

An LLC (limited liability company) is a legal structure. An S corp is a tax election. They’re not the same type of thing, which is why comparing them directly is a little like comparing a house with a mortgage. One describes the container; the other describes how you fund it.

Here’s what that means practically: you can form an LLC and then elect to have it taxed as an S corporation. The IRS calls this a “check-the-box” election, filed on Form 2553. So when most business owners ask “LLC vs. S corp,” they’re really asking: should I stick with the default LLC tax treatment (which the IRS calls a “disregarded entity” or partnership, depending on how many owners), or should I elect S corp status and change how my income gets taxed?

The legal liability protection, the operating agreement, the flexibility in ownership, those come from the LLC. The self-employment tax savings come from the S corp election. You can have both.

That said, there are also businesses that incorporate as actual S corps, the traditional way, with a formal corporation structure. I’ll flag where that matters. For most small business owners reading this, you’re choosing between a plain LLC and an LLC taxed as an S corp.

The Self-Employment Tax Math (Where the Real Money Is)

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This is the crux of it, and I want to show you the numbers that actually matter.

When you’re a single-member LLC (or a sole prop), every dollar of profit you earn is subject to self-employment tax, which is 15.3% on the first $168,600 of net income (as of 2026, with the Social Security wage base adjusting annually). Above that, you still owe 2.9% Medicare tax on everything, plus an additional 0.9% if you’re high-earning. That’s on top of your federal and state income taxes.

When you elect S corp status, you split your business income into two buckets: a “reasonable salary” that you pay yourself as a W-2 employee, and a “distribution” of remaining profits. The W-2 salary gets hit with payroll taxes. The distributions do not. That gap is where the savings live.

Here’s a simplified comparison for a single-owner service business:

ScenarioNet Business ProfitOwner SalaryDistributionApprox. SE/Payroll TaxEstimated Annual Savings vs. LLC
Single-member LLC$80,000N/AN/A~$11,300Baseline
LLC taxed as S corp$80,000$45,000$35,000~$6,900~$4,400
Single-member LLC$150,000N/AN/A~$19,500Baseline
LLC taxed as S corp$150,000$75,000$75,000~$11,500~$8,000
Single-member LLC$50,000N/AN/A~$7,100Baseline
LLC taxed as S corp$50,000$35,000$15,000~$5,400~$1,700

These are rough estimates based on 2026 rates and don’t account for state taxes, the deductible half of SE tax, or the QBI deduction. Please consult a CPA before making decisions based on these numbers. Individual situations vary significantly.

You’re probably thinking: “That $4,000-$8,000 in savings sounds great, but what’s the catch?” The catch is administrative cost. An S corp requires you to run actual payroll (with a W-2, quarterly payroll tax deposits, year-end 940/941 filings), maintain a separate business bank account and more formal bookkeeping, file a corporate tax return (Form 1120-S) in addition to your personal return, and potentially pay your accountant more. Payroll services like Gusto start around $40/month for a single employee, and the additional CPA time often runs $500-$1,500 a year more than a simple LLC return.

Real example: A freelance web developer in Austin, 2024, net profit around $95,000. She was paying roughly $13,400 per year in self-employment taxes as a single-member LLC. We set up an LLC with S corp election, established a $52,000 reasonable salary (in line with market rates for her work), and ran distributions for the rest. Her payroll tax burden dropped to about $8,100. The added accounting and payroll costs were approximately $1,800 a year. Net savings: around $3,500 annually. Not life-changing, but not nothing.

The “Reasonable Salary” Rule Is Where People Get Into Trouble

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I need to spend a minute here because this is where S corp owners get burned.

The IRS isn’t naive. They know the incentive to underpay yourself a salary and take everything as distributions. So they require that you pay yourself a “reasonable compensation” for the work you do in the business. If you’re a marketing consultant pulling $300,000 in revenue, paying yourself a $20,000 salary and taking $280,000 as distributions is going to get flagged. The IRS has won these cases in Tax Court repeatedly.

What’s “reasonable”? It should reflect what you’d pay someone else to do your job. The IRS small business tax center has guidance on this, and there are legitimate services that provide salary benchmark reports. Generally, your salary should be at or near market rate, and the more profitable your business, the less you can shrink the salary relative to distributions.

If you lowball the salary and get audited, the IRS can reclassify your distributions as wages, assess back payroll taxes, and pile on penalties. I’ve seen this sting clients who thought they were being clever. Don’t be clever here. Pay yourself fairly and document why you chose the number you did.

When the LLC Alone Is the Right Call

Not every business should elect S corp status. I want to be direct about this because the internet is full of “every LLC should be an S corp” takes that are just wrong.

The S corp election doesn’t make sense when your net profit is below roughly $40,000-$50,000. At that level, the tax savings rarely offset the additional compliance costs. It’s math, not opinion.

It also doesn’t work well if you have investors or expect to bring on different classes of equity holders. S corps are restricted to 100 shareholders, all of whom must be U.S. citizens or residents, and you can only have one class of stock. If you’re building something that might take venture funding or want to give different economic rights to different partners, the S corp structure will box you in. A standard LLC (or a C corp, which is a whole other conversation) gives you more flexibility.

If your business has unpredictable income that swings wildly year to year, running payroll on a fixed salary when your cash flow is inconsistent can be genuinely painful. I’ve worked with seasonal businesses where the S corp election created cash flow stress that wasn’t worth the tax savings.

Real example: A yoga studio owner in Denver with $38,000 net profit after paying her instructors. She’d read three articles telling her to “definitely elect S corp.” When we ran the numbers, her self-employment tax on $38,000 was about $5,400. Setting up payroll and the S corp return would have cost her roughly $2,200 in added accounting and payroll software. Net savings: $1,100 after expenses. Not worth the administrative headache and compliance risk for her situation. She stayed as a plain LLC. Right call.

The Actual Process: LLC to S Corp Election

If you’ve done the math and it pencils out, here’s how it works in practice (as of July 2026):

  1. Form your LLC in your state (if you haven’t already). You’ll file Articles of Organization and pay a filing fee, usually $50-$500 depending on the state.
  2. Get your EIN from the IRS (free, takes five minutes online).
  3. File Form 2553 with the IRS to elect S corp status. You generally need to file within 75 days of forming the entity, or by March 15 of the tax year you want the election to apply.
  4. Set up payroll. Services like Gusto, ADP Run, or Patriot Payroll can handle this. Budget $40-$80/month for a single-employee setup.
  5. Establish a clear separation of business and personal finances. The Consumer Financial Protection Bureau’s small business resources actually have decent guidance on financial record-keeping basics if you’re just getting started.
  6. Work with a CPA to determine your reasonable salary and document the rationale.

Miss the Form 2553 deadline and you’ll have to wait until the next tax year, or apply for late-election relief (which is available but not guaranteed). Mark the deadline on your calendar. Seriously.

Sources

This article is for general informational purposes only and does not constitute financial, tax, or legal advice. Business finance and tax rules vary by entity type, state, and individual circumstances. Consult a qualified CPA, enrolled agent, or business attorney for advice specific to your situation.

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