LLC vs S Corp: Tax and Liability Differences Explained
An S corp isn't a competing business structure — it's a tax election your LLC can make. Here's what actually changes when it does.
Updated 2026-08-15
Key Takeaways
- In an LLC vs S corp comparison, the two aren't parallel options — an S corp is a federal tax election, and your LLC can choose it or skip it.
- The biggest practical difference is how income gets taxed: default LLC profit is generally subject to self-employment tax, while an S corp election splits income into a reasonable salary and separate distributions.
- Liability protection doesn't change either way — it comes from the LLC itself, not the tax election.
- S corp status comes with eligibility limits (100 shareholders, generally U.S. owners, one class of stock) and added administrative work, mainly running payroll.
- You elect S corp status by filing IRS Form 2553, generally within two months and 15 days of the tax year you want it to apply to.
What Is an LLC?
A limited liability company (LLC) is a business entity that separates your personal assets from your business's debts and legal liabilities. It's formed by filing with your state, and by default the IRS treats it as a pass-through entity: business profit and loss flow to the owners' (members') personal tax returns, and the LLC itself doesn't pay federal income tax.
An LLC's default tax treatment isn't its only option, though. Without changing anything about its legal structure, an LLC can choose how it's taxed — as a disregarded entity, a partnership, or a corporation. That last option is where the S corp question comes in.
What Is an S Corp? (It's a Tax Election, Not an Entity)
In an LLC vs S corp comparison, it helps to start with what an S corp actually is: a tax classification you elect with the IRS by filing Form 2553, not a type of business entity you form with your state. There's no "Articles of S Corporation" filing anywhere — you form an LLC or a corporation first, and then, if it qualifies, that entity elects to be taxed under Subchapter S of the tax code.
Once the election is in place, the underlying LLC still has its own operating agreement, its own members, and its own liability shield. What changes is purely how the IRS taxes the profit that comes out of it — specifically, the split between a reasonable salary and separate distributions, covered below.
LLC vs S Corp Election at a Glance
Because an S corp election sits on top of an LLC rather than replacing it, most of the "differences" below are really differences between an LLC's default tax treatment and an LLC that has elected S corp taxation.
| LLC (Default Tax Status) | LLC Electing S Corp Status | |
|---|---|---|
| What it is | A state-formed business entity | Not a separate entity — a federal tax election an eligible LLC (or corporation) can make |
| Taxation | Pass-through; profit is generally subject to self-employment tax | Pass-through; owner-employees take a reasonable salary (payroll tax applies) plus distributions (generally not subject to self-employment tax) |
| Liability protection | Personal assets shielded from business debts when properly maintained | Same protection — it comes from the LLC, not the tax election |
| Ownership limits | Flexible; individuals, other LLCs, corporations, trusts, no cap on members | Restricted; up to 100 shareholders, generally U.S. citizens or residents, one class of stock |
| Administrative burden | Lighter; no requirement to run payroll for owners | Heavier; requires payroll for owner-employees, reasonable-salary documentation, and additional tax filings |
How Taxes Differ: Self-Employment Tax vs. Reasonable Salary Plus Distributions
Taxation is where an S corp election actually earns its reputation. Under an LLC's default pass-through treatment, an owner who's active in the business generally owes self-employment tax — Social Security and Medicare — on their full share of the LLC's profit. That's on top of ordinary income tax.
Once an LLC elects S corp status, an owner who works in the business becomes an employee for tax purposes. The business pays that owner a reasonable salary through normal payroll, with payroll taxes withheld, and any remaining profit can be paid out as a distribution — which is generally not subject to self-employment tax. That split is the entire tax case for electing S corp status.
"Reasonable" is doing real work in that sentence. The IRS expects the salary to reflect what someone would actually be paid for that role in that industry, based on factors like hours worked and responsibilities. Pay yourself an unreasonably low salary to shift more income into tax-advantaged distributions, and the IRS can reclassify that income as wages — plus penalties.
There's no universal break-even number
Every business's numbers are different, and the payroll and compliance cost of an S corp election has to be weighed against the self-employment tax it saves. Treat any dollar figure you see quoted elsewhere as a starting point, not a rule — a tax professional can model the actual math against your profit.
Liability Protection: The Same Either Way
One point worth stating plainly: an S corp election doesn't add, remove, or change your liability protection at all. That protection comes from having a properly formed and maintained LLC (or corporation) — a separate legal entity that shields your personal assets, like your home or personal savings, from the business's debts and legal claims.
Courts can still disregard that protection — "piercing the corporate veil," or its LLC equivalent — if the business isn't run as genuinely separate from its owners, such as commingling personal and business funds. That risk exists whether or not the LLC has elected S corp status, which is exactly why the tax election shouldn't be confused with a liability decision.
S Corp Eligibility: Who Can (and Can't) Elect S Corp Status
Not every LLC qualifies for S corp taxation. The IRS sets ownership limits on any entity electing S corp status, whether it started as an LLC or a corporation:
- Shareholder cap. No more than 100 shareholders (members, for an LLC making the election).
- Eligible owners. Owners generally must be U.S. citizens or residents — most corporations, partnerships, and non-resident individuals can't hold an ownership stake in an S corp.
- One class of stock. All owners must have identical rights to distributions and liquidation proceeds, even if voting rights differ. This is one reason a business planning to raise venture funding or issue multiple classes of stock typically looks at C corporation status instead.
If your LLC has (or plans to bring on) a corporate member, a non-U.S. owner, or more than 100 members, S corp taxation likely isn't available to you regardless of how attractive the tax savings look on paper.
The Administrative Trade-Off: Payroll, Salary Documentation, and Filings
The tax savings from an S corp election come with real, ongoing administrative work that a default pass-through LLC doesn't have to do:
- Running payroll. Every owner-employee needs to be on formal payroll, with taxes withheld and reported, rather than simply taking draws from the business.
- Documenting a reasonable salary. You'll want a defensible basis for the salary figure — industry compensation data, job duties, and hours worked — in case the IRS ever questions it.
- Additional tax filings. An S corp election generally means a separate business tax return (in addition to each owner's personal return) and payroll tax filings that a default LLC doesn't file.
None of this is disqualifying — plenty of small businesses run payroll and file the extra forms without much friction, often with an accountant's help. But it's real cost, in both time and money, that has to be weighed against the self-employment tax it saves.
When Does an S Corp Election Make Sense?
There's no single right answer — it depends on your profit, how much of it you're paying yourself, and how much administrative work you're willing to take on.
- Sticking with default LLC taxation may make sense if your business is newer, profit is modest, you're reinvesting most of what you earn, or you'd rather avoid running payroll and filing an extra tax return.
- Electing S corp status may make sense if your business has consistent, meaningful profit beyond a reasonable salary for the work you do, you're comfortable with the added payroll and filing requirements, and a tax professional's modeling shows the self-employment tax savings outweigh those added costs.
Because this decision touches both tax strategy and how your LLC is governed, it's worth reviewing with both a tax professional and a business attorney before you file Form 2553 — especially if your operating agreement would need updates to reflect how you're paying yourself. CompanySage also offers on-demand attorney access as an add-on to formation plans, for an additional fee, if you'd rather get that guidance without shopping for outside counsel.
How to Elect S Corp Status
If you've decided an S corp election fits your business, the process runs through the IRS rather than your state's filing office.
Confirm your LLC is eligible
Get (or confirm) your EIN
File IRS Form 2553
Set up payroll
Update your governing documents
A tax professional can confirm eligibility and prepare Form 2553 correctly the first time, and a business attorney can help make sure your LLC's operating agreement still matches how you're actually running the business — particularly for a single-member LLC, where the reasonable-salary rules apply just as much as they do to a multi-member company. If you're still deciding on an entity in the first place, our guide to what an LLC is is a good place to start before you weigh a tax election on top of it.
Frequently Asked Questions
Is an S corp a type of business entity, like an LLC?
No. An S corp isn't a legal entity at all — it's a federal tax election you file with the IRS. The underlying entity is still an LLC or a corporation; "S corp" just describes how the IRS taxes it once the election is in place.
Can my LLC elect S corp taxation?
Generally, yes, as long as it meets the IRS's eligibility rules: no more than 100 shareholders, owners who are generally U.S. citizens or residents rather than corporations or partnerships, and only one class of stock or membership interest. You elect by filing Form 2553 with the IRS.
Does electing S corp status change my liability protection?
No. Liability protection comes from the underlying LLC or corporation, not from the tax election layered on top of it. An LLC that elects S corp taxation keeps the same personal-asset protection it had before, as long as it's properly formed and maintained.
How much can I actually save in self-employment tax with an S corp election?
It depends on your profit, your industry's typical compensation, and what a reasonable salary looks like for your role — there's no single number that applies to every business. As a rough shape: LLC owners taxed as a default pass-through generally owe self-employment tax on the entity's full profit, while an S corp election lets owner-employees split income into a reasonable salary (subject to payroll tax) and remaining distributions (which typically aren't). A tax professional can model the actual dollar difference against your numbers.
How many shareholders can an S corp have?
Up to 100. Shareholders generally must be U.S. citizens or residents rather than corporations, partnerships, or most trusts, and the company can issue only one class of stock or membership interest — meaning everyone's distribution and liquidation rights have to be identical, even if voting rights differ.
What's the deadline to file Form 2553?
The IRS generally requires Form 2553 to be filed no later than two months and 15 days after the start of the tax year the election should apply to; a brand-new business can typically file at any point in its first tax year. Missing the window doesn't always close the door — the IRS has a late-election relief process in some circumstances — but it's worth filing on time and confirming current rules with a tax professional or the instructions on Form 2553 itself.
Do I need to run payroll if my LLC elects S corp status?
Yes, for any owner who works in the business. Once the election is in place, the IRS expects owner-employees to be paid a reasonable salary through standard payroll, with taxes withheld, before any remaining profit goes out as a distribution. That's the tradeoff for the self-employment tax savings: added payroll setup and ongoing compliance.
Can I switch back from S corp taxation later?
Generally, yes, though the IRS restricts how often you can change your entity's tax election, and revoking S corp status usually means waiting a period before you can re-elect it. If your numbers change significantly, it's worth revisiting the decision with a tax professional rather than assuming the original choice is permanent.
Keep reading
Related guides from the CompanySage library.
Not sure which is right for you?
Every business's numbers are different, and an S corp election has real payroll and compliance consequences once it's in place. Talk to a business attorney before you file anything.
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