First: LLC and S-Corp are not the same type of thing
Before comparing them, it helps to understand that LLC and S-Corp operate on two different levels:
- LLC is a legal structure — it's how your business is registered with your state.
- S-Corp is a tax election — it's how the IRS taxes your business income.
This means they're not mutually exclusive. In fact, the most common setup for profitable small businesses is: an LLC that elects to be taxed as an S-Corp. You get the legal simplicity of an LLC combined with the tax advantages of S-Corp treatment.
When people say "should I be an LLC or an S-Corp," they're usually really asking: "should my LLC elect S-Corp tax treatment?" Because the LLC structure itself stays the same — only the tax treatment changes.
How each is taxed — and why it matters
Default LLC taxation (no S-Corp election)
By default, if you're the only owner of an LLC, the IRS treats all your business profit as your personal income. Every dollar of net profit is subject to:
- Self-employment tax: 15.3% (covers Social Security and Medicare)
- Federal income tax: based on your total income bracket
- State income tax: varies by state
The self-employment tax applies to all your net profit. There's no way around it under default LLC taxation.
S-Corp taxation (after electing S-Corp status)
With an S-Corp election, your income is split into two parts:
- Your salary — subject to payroll taxes (same as self-employment tax), reported on a W-2
- Owner distributions — the remaining profit passed through to you, not subject to self-employment tax
The tax saving comes from that second category. Distributions avoid the 15.3% self-employment tax entirely. The more profit you take as distributions rather than salary, the more you save — but the IRS requires your salary to be "reasonable," so there's a limit to how far you can take this.
A real example with numbers
Let's say your LLC nets $100,000 in profit this year.
| Default LLC | LLC taxed as S-Corp | |
|---|---|---|
| Net profit | $100,000 | $100,000 |
| Owner salary | N/A | $60,000 |
| Distributions | N/A | $40,000 |
| Self-employment / payroll tax | $14,130 (on $100K) | $8,478 (on $60K salary only) |
| Estimated SE tax savings | — | ~$5,652/year |
| Additional S-Corp costs (payroll, CPA) | — | ~$1,500–$3,000/year |
| Approximate net savings | — | ~$2,500–$4,000/year |
The actual savings depend on your salary amount, state taxes, and the specific costs of running payroll and filing an S-Corp return. Always run the numbers with a CPA for your situation before making the election.
At what income level does an S-Corp make sense?
This is the question most small business owners actually want answered. The general guideline most CPAs use:
| Annual net profit | S-Corp recommendation |
|---|---|
| Under $40,000 | ❌ Not worth it — S-Corp overhead costs likely exceed savings |
| $40,000 – $60,000 | 🤔 Maybe — run the numbers with a CPA; depends on your state and costs |
| $60,000 – $100,000 | ✅ Usually worth it — savings typically $2,000–$5,000/year after costs |
| Over $100,000 | ✅ Strongly worth it — savings can be significant |
The real costs of running an S-Corp
The tax savings are real — but so are the additional costs and requirements. Before electing S-Corp status, understand what you're taking on:
- Separate business tax return (Form 1120-S) — Due March 15. More complex than a Schedule C, almost always requires a CPA. Typical cost: $500–$1,500/year.
- Payroll setup and quarterly filings — You must run payroll for yourself as an employee, file quarterly payroll tax returns (Form 941), and issue yourself a W-2 at year end. Payroll service cost: $500–$1,500/year.
- More accounting work — With payroll, quarterly filings, and a separate business return, your bookkeeping becomes more demanding. Factor in CPA costs accordingly.
- Reasonable salary scrutiny — The IRS watches for S-Corp owners who pay themselves unreasonably low salaries to maximize distributions. Getting this wrong can trigger audits and penalties.
The IRS has successfully challenged S-Corp owners who paid themselves below-market salaries to avoid payroll taxes. Your salary must be comparable to what you'd pay an employee to do the same work. A CPA can help you establish a defensible salary for your industry and income level.
Side-by-side comparison
| Feature | Default LLC | LLC with S-Corp election |
|---|---|---|
| Self-employment tax | On all net profit | Only on salary portion |
| Payroll required | No | Yes — owner must be on payroll |
| Separate business tax return | No (Schedule C on personal return) | Yes — Form 1120-S (due March 15) |
| Complexity | Low | Medium to high |
| Annual compliance cost | Low (~$0–$500) | Higher (~$1,500–$3,000+) |
| Eligibility restriction | None (any owner) | U.S. citizens and permanent residents only |
| Best for | Income under $40K–$50K, or simplicity preference | Consistent profit over $50K, willing to handle added compliance |
How to make the S-Corp election
If you've decided an S-Corp election makes sense, here's what's involved:
- File Form 2553 with the IRS — this is the official S-Corp election form. It must be filed within 75 days of the start of your tax year (or within 75 days of forming your LLC) for the election to apply to the current year.
- Set up payroll — use a payroll service (Gusto, ADP, QuickBooks Payroll) to run your salary as an employee. This handles withholding, quarterly filings, and W-2 generation.
- Work with a CPA — given the complexity, an S-Corp is rarely a DIY situation. A CPA can determine your reasonable salary, file Form 1120-S, and help you stay compliant year after year.
If your LLC is consistently netting more than $50,000 per year and you're planning to keep growing, an S-Corp election is worth a conversation with a CPA. The savings are real — but so are the requirements. Don't make this decision based on a general article alone; the right answer depends on your specific income, salary, and state.