One of the most confusing questions new founders face: should I form an LLC or an S corporation? The confusion is understandable — because an S corp is not actually a business entity at all. It is a tax election you make with the IRS. You can have an LLC that is taxed as an S corp.
Let us untangle this properly.
The key insight: entity vs. tax status
- LLC = a legal business entity created under state law. It determines your liability protection and basic structure.
- S corp = a federal tax election. It determines how your business profits are taxed.
So the real comparison is usually: LLC taxed as a disregarded entity (default) vs. LLC taxed as an S corp. You form the LLC first, then optionally elect S corp taxation by filing IRS Form 2553.
How each is taxed
Default LLC taxation
- Single-member LLC: the IRS treats you as a "disregarded entity." Business profit flows straight onto your personal tax return (Schedule C). Simple — one tax return.
- Multi-member LLC: taxed as a partnership. The LLC files an informational return (Form 1065) and each member pays tax on their share.
Either way, all net profit is subject to self-employment tax (15.3% for Social Security and Medicare, up to the wage base) on top of income tax.
S corp taxation
With an S corp election, the business still passes profits through to owners (no double taxation like a C corp). The big difference: owners who work in the business must pay themselves a "reasonable salary" as W-2 employees. That salary is subject to payroll taxes — but any remaining profit distributed to owners is not subject to self-employment tax.
Example: Your business nets $100,000.
- As a default LLC: you pay 15.3% self-employment tax on the full $100,000 = $15,300 (plus income tax).
- As an S corp: you pay yourself a $60,000 salary (payroll tax ≈ $9,180) and take $40,000 as distributions with no self-employment tax. You save roughly $6,120.
When the S corp election makes sense
The S corp election typically pays off when your net profit is consistently above $60,000–$80,000 per year. Below that, the extra costs often eat the savings:
- Payroll costs: you must run payroll (a service costs $30–$60/month).
- Extra tax filings: S corps file Form 1120-S annually, and you will likely want an accountant ($500–$1,500/year).
- Reasonable salary rules: the IRS watches this closely. Set the salary too low and you risk penalties.
A common rule of thumb: if the self-employment tax savings exceed ~$3,000–$4,000/year after extra costs, elect S corp status.
Side-by-side comparison
| Feature | LLC (default taxation) | LLC with S corp election |
|---|---|---|
| Formation | File Articles of Organization with state | Same + file IRS Form 2553 |
| Liability protection | Yes | Yes |
| Tax returns | Personal return (+1065 if multi-member) | Form 1120-S + personal return |
| Self-employment tax | On all net profit (15.3%) | Only on W-2 salary |
| Payroll required | No | Yes (reasonable salary) |
| Ownership rules | Flexible — any owners, any profit splits | Strict — 100 US owners max, one class of stock |
| Admin burden | Low | Medium |
| Best for profit under ~$60k | ✅ Yes | ❌ Usually not worth it |
| Best for profit over ~$80k | Consider switching | ✅ Yes |
Ownership restrictions of S corps
This is the part people miss. S corps have strict IRS rules:
- Maximum 100 shareholders, all must be US citizens or residents.
- Only one class of stock — no preferred shares with special rights.
- Shareholders must be individuals, certain trusts, or estates — no corporations or partnerships as owners.
If you plan to raise venture capital or bring on corporate investors, an S corp will box you in. Startups targeting VC funding almost always choose a Delaware C corp instead.
Can you switch later?
Yes — and this is the strategy most accountants recommend:
- Start as a plain LLC. Simple, cheap, flexible.
- Elect S corp taxation when profits justify it (usually year 2–3). File Form 2553 by March 15 to have it apply to the current tax year.
- You can also revoke the election later if circumstances change (with IRS consent).
There is no penalty for waiting. The election is retroactive to the start of the tax year if filed on time.
What about C corps?
For completeness: a C corporation pays its own corporate income tax (21% federal), and then shareholders pay tax again on dividends — "double taxation." C corps make sense for startups raising institutional investment or planning an IPO. For everyone else, the LLC (with optional S election) is simpler and usually cheaper on taxes.
Decision framework
Ask yourself these three questions:
- Is my net profit reliably above $60k–$80k? No → stay a default LLC. Yes → run the S corp math with an accountant.
- Do I want investors or complex ownership? Yes → avoid S corp restrictions; consider LLC or C corp.
- Am I willing to run payroll and file an extra return? No → the simplicity of a default LLC is worth more than the savings.
The bottom line
Start with an LLC — it gives you liability protection with minimal hassle. Treat the S corp election as a tax upgrade you switch on when your profits make it worthwhile, not a day-one decision. And when the numbers get serious, spend $200 on an hour with a CPA before filing Form 2553; it is the highest-ROI meeting a growing business can have.