LLC vs S-Corp vs C-Corp: How to Choose for Your Small Business
People ask "LLC or S-corp?" as if the two were competing products. They are not, and untangling that one confusion clears up most of the decision. This guide separates the legal question (what entity do I form under state law?) from the tax question (how does the IRS treat it?), then walks through the trade-offs so you can see where your own business lands.
Two questions hiding inside one
The legal question is answered by a state. When you file paperwork with a Secretary of State, you create a legal entity: a corporation or a limited liability company (or a partnership, or you simply stay a sole proprietor). That choice governs liability protection, ownership mechanics, and governance formalities.
The tax question is answered by the IRS. A legal entity is then classified for federal income tax purposes. A corporation is a C-corp by default. An LLC is taxed as a sole proprietorship (one owner) or a partnership (two or more) by default. Either can elect to be taxed as an S-corporation if it meets the eligibility rules.
So the real menu is a combination: an LLC taxed as a disregarded entity, an LLC taxed as a partnership, an LLC taxed as an S-corp, a corporation taxed as an S-corp, or a corporation taxed as a C-corp. The rest of this article compares the practical differences.
Liability protection
Both LLCs and corporations are designed to separate your personal assets from business debts and lawsuits. Neither protects you from your own negligence or personal guarantees you sign. Courts can also disregard the separation when owners mix funds or ignore basic formalities, which is why separating personal and business finances matters as much as the filing itself.
For liability purposes an LLC and a corporation are broadly similar. Corporations come with more built-in formalities (bylaws, directors, minutes), while LLCs rely on an operating agreement and typically have lighter requirements. Because the S-corp label is a tax election, it does not add or subtract any liability protection.
How each is taxed
LLC taxed by default. A single-member LLC reports on Schedule C of your personal return, and profit is generally subject to self-employment tax (Social Security and Medicare, about 15.3 percent on net earnings up to the Social Security wage base, and 2.9 percent Medicare beyond). A multi-member LLC files a partnership return and passes income to the members.
S-corp. The business files Form 1120-S and passes income to owners' personal returns. Owners who work in the business must be paid a reasonable salary through payroll, which is subject to payroll taxes. Remaining profit can be distributed without self-employment tax. The potential savings come from that split, but so do the costs: payroll, an extra return, and scrutiny of the salary level. See S-corp reasonable compensation.
C-corp. The corporation pays its own tax (a flat 21 percent federal rate under current law), and shareholders pay tax again on dividends. Owners who work in the business receive salary that is deductible to the company. The extra layer of tax is the price, in exchange for flexibility with investors, stock classes, and certain benefits.
Side-by-side snapshot
| Factor | LLC (default) | S-corp election | C-corp |
|---|---|---|---|
| Federal return | Schedule C or Form 1065 | Form 1120-S | Form 1120 |
| Entity-level federal income tax | Generally none | Generally none | Yes |
| Owner payroll required | No (draws) | Yes, reasonable salary | Yes, if owner works there |
| Self-employment tax | On all active profit | Only on salary (through payroll tax) | Only on salary |
| Ownership limits | Flexible | 100 shareholders, one class of stock, eligible shareholders | Flexible |
| Admin burden | Lightest | Moderate | Heaviest |
Ownership and growth constraints
S-corps come with strict ownership rules. Shareholders must generally be individuals who are U.S. citizens or residents, certain trusts, and estates. No partnerships, no corporations, no nonresident aliens. There can be only one class of stock, which limits creative profit splits. Those rules are covered in S-corp eligibility rules.
An LLC taxed as a partnership can allocate profits and losses in ways that differ from ownership percentages (subject to tax rules), which suits joint ventures and real estate. A C-corp can issue multiple classes of stock, which is why venture-backed companies use them, and why the topic comes up in choosing an entity when you have investors.
When each tends to fit
These are tendencies, not rules:
- Default LLC: early stage, modest profit, or a business where the owner does not want payroll yet. Also common for real estate holdings and side businesses.
- LLC with S-corp election: an owner-operated business with steady profit well above what a fair salary would be, where payroll savings outweigh the extra compliance cost. See when to elect S-corp status.
- C-corp: businesses expecting outside investors, planning to retain earnings for growth, or wanting the treatment described in QSBS basics for qualifying stock.
The questions that actually decide it
- How much profit do you expect after paying yourself a market salary? If the answer is small, the S-corp costs may cancel the savings.
- Are you the only owner, or are there partners with different roles? Multiple owners raise the value of a well drafted operating agreement.
- Will you reinvest most profit or take it out? Reinvestment favors the low flat corporate rate in some situations, though the analysis is nuanced.
- Do you plan to raise outside money or sell the business? Buyers and investors often prefer specific structures.
- What do your state's taxes and fees look like? Some states impose entity-level taxes or fees that change the math. Read our state notes for examples.
Common misconceptions
"An S-corp is a better kind of LLC." No. It is a tax election that some LLCs and corporations make. "S-corps avoid all payroll tax." No. Salary is subject to payroll tax, and the IRS expects it to be reasonable. "A C-corp always means double taxation." Only if profits are distributed as dividends or otherwise taxed to shareholders. Many owner-operators pay out most profit as deductible salary. "I must form where my business is." Generally you must register wherever you actually do business, regardless of where you formed. See foreign qualification basics.
A sensible path for many owners
Many owner-operators form an LLC, run for a year or two on default tax treatment while they learn what profit looks like, and revisit the S-corp election once income stabilizes. Because elections have deadlines and some can be corrected late, planning before the year starts is cheaper than fixing afterward. The Form 2553 election guide explains timing.
If you are weighing a change on real numbers, a conversation with AE Tax Advisors can help model salary, payroll cost, state taxes, and benefits before you commit. You can start with a discovery call.