LLC, S corp or sole proprietorship, what actually differs?
Liability comes from state entity law, taxation comes from a separate federal election. A sole proprietorship gives no liability shield; an LLC gives the shield and is taxed through the owner unless an election is filed; the S corporation is a tax election, not a separate entity form.
The answer differs between the federal level and the states, see the rows below.
The answer by level
State level
A limited liability company and a corporation are formed under state law and give the owner limited liability for the debts of the business; a sole proprietorship is not a separate entity and the owner answers personally.
8 Del. C. Chapter 1Tax treatment
A single member limited liability company is disregarded for federal tax by default and reported on the owner's return, unless the owner elects corporate treatment.
IRS Publication 3402, Taxation of Limited Liability CompaniesFederal level
An S corporation election is made on Form 2553 and requires, among other conditions, no more than 100 shareholders, a single class of stock and only eligible shareholders.
Form 2553, Election by a Small Business Corporation, 26 U.S.C. § 1362
Source lines
- State corporate and limited liability company statutes create the entity and the limited liability that follows from it.
- IRS Publication 3402 sets out the default classification of a limited liability company and the way an election changes it.
- Form 2553 and 26 U.S.C. § 1362 set the eligibility conditions for an S corporation election, including the shareholder limit and the single class of stock.
What it means for the company
The two decisions are taken separately and at different times. Choosing the entity in the wrong state, or missing the election window, costs more to unwind than to plan.
| Level | Requirement | Source |
|---|---|---|
| State level | A limited liability company and a corporation are formed under state law and give the owner limited liability for the debts of the business; a sole proprietorship is not a separate entity and the owner answers personally. | 8 Del. C. Chapter 1 |
| Tax treatment | A single member limited liability company is disregarded for federal tax by default and reported on the owner's return, unless the owner elects corporate treatment. | IRS Publication 3402, Taxation of Limited Liability Companies |
| Federal level | An S corporation election is made on Form 2553 and requires, among other conditions, no more than 100 shareholders, a single class of stock and only eligible shareholders. | Form 2553, Election by a Small Business Corporation, 26 U.S.C. § 1362 |
What it means for the individual
The owner of a sole proprietorship answers with personal assets for the debts of the business. The shield exists only where the entity is formed, funded and kept separate.
Source lines
- Delaware General Corporation Law8 Del. C. Chapter 1 · read 2026-08-25 · proof cc4821482dc1c437
- Internal Revenue ServiceIRS Publication 3402, Taxation of Limited Liability Companies · read 2026-08-25 · proof cc4821482dc1c437Official source
- Internal Revenue ServiceForm 2553, Election by a Small Business Corporation, 26 U.S.C. § 1362 · read 2026-08-25 · proof cc4821482dc1c437Official source
Next step
Decide the entity under state law first, then take the federal tax election as a second, documented step with its filing date recorded.
This page reports what the sources say, with the identifier and address of the publisher. It is not legal advice and does not decide an individual matter.
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