LLC vs. S-Corp: What's the Real Difference?
One of the most common confusions for business owners: the difference between an LLC and an S-Corp. They aren't mutually exclusive, here's what you actually need to know.
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Legal Entity vs. Tax Status: The Core Concept
This is the most important thing to understand before making any entity decision:
LLC (Limited Liability Company) is a legal entity formed at the state level. It protects your personal assets from business lawsuits and gives you a separate legal identity for your business.
S-Corp is a tax election made with the IRS by filing Form 2553. It tells the IRS how you want your business income to be taxed, it does not change your state-law entity structure.
Most small businesses start as an LLC. By default, the IRS taxes a single-member LLC as a sole proprietorship. You file a Schedule C on your personal return, and you pay self-employment tax on 100% of your net profit. When you elect S-Corp status, your LLC remains an LLC legally, but for tax purposes it becomes an S-Corp.
The Short Version
You can be both. Most small business owners who elect S-Corp status have an LLC taxed as an S-Corp. The LLC protects you legally. The S-Corp election reduces your self-employment tax bill.
The Core Tax Difference
The entire tax case for an S-Corp election comes down to one mechanism: self-employment tax vs. payroll tax on a salary only.
Standard LLC (Sole Prop)
- 15.3% Self-Employment Tax on 100% of profit (up to SS wage base)
- Simple compliance (Schedule C)
- No payroll requirement
- No separate business return
S-Corp Election
- 15.3% Tax ONLY on W-2 salary portion
- Distributions above salary are SE-tax-free
- Requires payroll + quarterly tax returns
- Separate Form 1120-S return required
Worked Example: $150K Net Income
Without S-Corp (LLC/Sole Prop):
$150,000 × 92.35% × 15.3% SE tax = $21,215 SE tax
With S-Corp at $75K salary:
$75,000 × 15.3% payroll tax = $11,475
Plus ~$3,000 compliance costs = $14,475 total
Net savings: $21,215 - $14,475 = ~$6,740/year
Use the S-Corp calculator to model your specific situation.
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When Does the S-Corp Election Make Sense?
The general rule of thumb is that S-Corp status becomes beneficial when your net profit consistently falls between $75,000 and $100,000 annually. Why? Because the tax savings need to be large enough to offset the compliance costs.
S-Corps require: running formal payroll, filing quarterly payroll tax returns (941/940), filing a separate business tax return (Form 1120-S), and paying state franchise taxes where applicable.
If you make $50,000 net, the tax savings might be $2,000 but the payroll and accounting costs might be $2,500, not worth it. But at $150,000, the savings typically run $8,000-$12,000, easily justifying the extra admin work.
Still not sure? The LLC vs. S-Corp Decision Tool walks through the key decision factors for your situation in about 2 minutes. Or for a deeper look at the election mechanics, see the S-Corp Election guide.
| Situation | Recommendation |
|---|---|
| Net SE income under $60K | Stay LLC/sole prop, compliance costs likely exceed savings |
| Net SE income $75K-$150K | Model it carefully, often worth it, state-dependent |
| Net SE income $150K+ | S-Corp election almost always wins after compliance costs |
| High W-2 income (above SS wage base) | Reduced benefit, only Medicare savings apply on distributions |
| Income highly variable year to year | More complex, payroll management requires care |
| Hate paperwork / compliance | Factor in the admin burden; it's real and ongoing |
The Compliance Reality
The S-Corp election is not a "set it and forget it" strategy. The ongoing compliance requirements are real, and underestimating them is a common mistake:
Running payroll is not optional
If you perform services for your S-Corp and receive compensation, you must run payroll. This means quarterly 941 filings, W-2 at year-end, and employer-side FICA taxes. Skipping payroll and taking only distributions is the #1 S-Corp audit trigger.
Annual Compliance Checklist
Common Questions
Can my LLC stay an LLC and still be taxed as an S-Corp?
Yes, and this is the most common structure for solo professionals. An LLC (limited liability company) is a state-law entity. The S-Corp designation is a federal tax election. You file Form 2553 to elect S-Corp taxation; your LLC remains an LLC under state law with all the same liability protection and operational flexibility. You do not need to form a corporation or change your state filings.
At exactly what income does the S-Corp election make sense?
There's no universal threshold, but the most common benchmark is $75,000-$100,000 in net self-employment income. Below that range, compliance costs (payroll service, Form 1120-S preparation, additional bookkeeping) typically consume most or all of the tax savings. Above it, the savings compound quickly. State taxes complicate the math. California's $800 annual franchise tax and New York City's UBT both shift the break-even point higher. Use the S-Corp calculator to model your specific numbers.
What does the S-Corp election actually change about my taxes?
As a sole prop or disregarded LLC, you pay self-employment tax (15.3% up to the Social Security wage base, 2.9% above it) on all net business income. With an S-Corp election, you pay employment taxes only on your W-2 salary, not on distributions. If you earn $150,000 net and set a $75,000 salary, you only pay payroll taxes on $75,000. The $75,000 distribution is taxable as ordinary income but not subject to SE tax, saving you roughly $10,000-$11,000 per year.
What are the ongoing costs of an S-Corp election?
Typical annual costs include: payroll service ($600-$1,500/year), additional tax return preparation for Form 1120-S ($800-$2,500 depending on complexity), and potentially a state franchise tax or annual report fee. Total ongoing cost usually falls in the $2,000-$4,000/year range. One-time setup costs. LLC formation, Form 2553, payroll setup, typically run $1,000-$4,000.
What's the difference between this guide and the /llc-vs-s-corp page?
The /resources/guides/llc-vs-s-corp page (this one) is a conceptual explainer: it covers the legal vs. tax distinction, the mechanics of how S-Corp taxation works, and when to make the switch. The /llc-vs-s-corp page is a service-oriented comparison aimed at business owners evaluating their options. The /tools/llc-vs-s-corp-decision-tool is an interactive tool that walks you through a decision tree based on your specific situation.
Can I undo an S-Corp election if it doesn't work out?
Yes, but it's not automatic. To revoke an S-Corp election, shareholders holding more than 50% of shares must file a statement of revocation with the IRS. If you revoke, you generally cannot re-elect S-Corp status for five years without IRS consent. This is why the decision deserves careful modeling upfront rather than 'try it and see.'
Does the S-Corp election affect my QBI (Section 199A) deduction?
Yes, but the interaction is nuanced. S-Corp income is generally eligible for the Section 199A QBI deduction (up to 20% of qualified business income). However, S-Corp owner wages reduce QBI, so a very high salary can reduce your 199A deduction. For Specified Service Trade or Businesses (SSTBs) like law, accounting, consulting, and medicine, the deduction phases out at higher income levels regardless of entity structure. This should be part of your planning analysis.
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