LLC vs. S Corp: How Each Works and When to Choose One
An LLC is a state business entity; an S corp is a federal tax election. Here is how each works, what each costs, and which one fits different situations.
New business owners compare “LLC vs. S corp” as though the two were rival versions of the same thing. They are not. An LLC is a legal entity created under state law. An S corporation is a tax status granted by the IRS under Subchapter S of the tax code. A corporation elects S corp treatment with a form filed to the IRS, and an LLC can do the same. That overlap is exactly why the choice confuses people, and it is also why the real decision usually comes down to taxes and paperwork rather than legal form alone.
How an LLC works
An LLC, or limited liability company, is formed by filing articles of organization with a state and paying a filing fee. Fees, annual reports, and renewal requirements differ by state and change over time, so the upfront cost depends on where the business registers.
Owners of an LLC are called members. An LLC can have one member or many, and federal rules do not require members to be U.S. citizens. By default, the IRS treats an LLC as a pass-through entity: a single-member LLC is a “disregarded entity” and its owner reports business income on Schedule C of a personal tax return, while a multi-member LLC is taxed like a partnership. Profits are taxed once, at the owners’ individual rates. There is no separate corporate income tax.
The trade-off is the self-employment tax. Net earnings of an active LLC member are generally subject to Social Security and Medicare taxes (15.3 percent on most earnings) in addition to income tax. The Social Security portion applies only up to an annual earnings limit that changes each year; the Medicare portion has no cap.
LLCs are also the simpler structure to run. Most states require few formalities: no mandatory board meetings, no required minutes, and flexible management rules that the members set themselves.
How an S corp works
An S corporation starts as a corporation (or an LLC that has elected to be taxed as a corporation) and then elects S status by filing IRS Form 2553, generally within 2 months and 15 days of the start of the tax year. Like an LLC, it is a pass-through entity: profits and losses flow through to the owners’ personal tax returns, so the business avoids the double taxation that applies to a regular C corporation.
Eligibility has hard limits. An S corp may have no more than 100 shareholders, and shareholders must be U.S. citizens or residents, with only narrow exceptions. It may issue only one class of stock, and it must be a domestic corporation. Foreign owners, large investor groups, and companies that need multiple stock classes cannot use S corp status.
The central tax difference is payroll. An owner who works in an S corp must take a “reasonable salary,” and that salary is subject to payroll taxes. Profits paid out beyond the salary, as distributions, are generally not subject to Social Security and Medicare taxes. That gap is where the S corp’s tax saving comes from: the larger the share of profit taken as distributions rather than salary, the larger the saving.
The cost is administration. An S corp must run payroll, file payroll tax returns, keep corporate formalities such as meetings and minutes, and usually pays more for accounting than a plain LLC does.
LLC vs. S corp at a glance
| LLC | S corp | |
|---|---|---|
| What it is | A business entity created under state law | A federal tax election available to qualifying corporations (and LLCs that elect corporate taxation) |
| Who qualifies | One or more members; no citizenship requirement | 100 or fewer shareholders; U.S. citizens or residents; one class of stock; domestic corporation |
| Costs | State filing fee plus annual reports; low ongoing compliance cost | State filing fee plus payroll setup, payroll tax filings, and corporate formalities; higher accounting costs |
| Pros | Simple to form and run; flexible management; profits taxed once at individual rates; any owner allowed | Pass-through taxation; distributions beyond a reasonable salary generally avoid Social Security and Medicare taxes; established corporate structure |
| Cons | Active members pay self-employment tax on net earnings; fewer options for outside investors | Strict eligibility rules; mandatory payroll and formalities; IRS scrutiny of whether owner salaries are “reasonable” |
The verdict: which one fits your situation
Pick an LLC if you are a freelancer, consultant, or small shop owner with modest profits. The paperwork is light, and at lower income levels the S corp’s payroll and accounting costs would eat up any tax saving.
Pick an S corp (or elect S corp taxation for your LLC) if the business earns steady profits well above what you would reasonably pay yourself as a salary. That is the point where the payroll-tax saving on distributions starts to outweigh the extra administration.
Pick an LLC if any owner is not a U.S. citizen or resident, if you expect more than 100 owners, or if you want multiple classes of stock. The S corp rules close the door on all three.
Many owners take a middle path: form an LLC for its simplicity, then elect S corp taxation later, once profits grow large enough to justify payroll. The election is filed with the IRS on Form 2553, and the deadline is strict, so the timing matters more than the paperwork.
This is general information, not tax advice. State filing rules and federal tax figures change, so check the current IRS instructions for Form 2553 and your state’s business-registration office, or talk to a tax professional about your situation.
Explainer based on program rules published by the Internal Revenue Service (Subchapter S eligibility and Form 2553 instructions) and the U.S. Small Business Administration’s guidance on business structures.
