Business Structures Explained: Sole Proprietorship, LLC, S Corp or C Corp?

An S corporation isn’t a business structure at all. It’s a tax election, and that one fact trips up more people than any other when they compare the types of business structures. Your real choice has two layers: the legal entity you form, and how the IRS taxes it.

This guide walks through the sole proprietorship, general partnership, LLC, S corporation, and C corporation, plus a quick note on nonprofits. For each one, you’ll see who owns it, who’s liable, how the IRS taxes it by default, and what paperwork you’re signing up for. It won’t tell you what you’ll save, because that depends on your income, your state, and your facts.

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Key Takeaways

• You make two choices: a legal entity (sole proprietorship, partnership, LLC, corporation) and a tax treatment.
• Sole proprietors and general partners are personally on the hook for business debts. LLC owners and shareholders generally aren’t, with limits.
• An S corp is a tax election that a qualifying corporation or LLC can make. It isn’t its own entity.
• A C corporation is taxed separately from its owners, which can mean tax at two levels.
• Fees and ongoing requirements vary by state, so check your state’s filing office before you decide.

Why Your Business Structure Matters

Here’s what most articles won’t tell you: structure isn’t one decision, it’s two. Mixing them up is how people end up asking “LLC or S corp?” as if they were rivals.

According to the IRS’s business structures page, your structure determines which income tax return form you file, and you should weigh both legal and tax issues when you pick one. The SBA’s guidance on choosing a structure frames it the same way: the choice touches your taxes, your personal liability, and how much regulation you face.

Because this decision is hard to unwind, it’s worth a conversation with a qualified attorney and a CPA. The questions near the end of this article will make that meeting more productive.

The Main Types of Business Structures, One by One

Sole Proprietorship: The Default

• Owners: One person.
• Liability: The SBA notes that you and the business are considered the same legal entity, so you’re personally responsible for business debts and obligations.
• Default taxation: Profit is taxed at the personal level. According to the IRS, a sole proprietor generally reports business income and expenses on Schedule C attached to Form 1040. Net earnings are generally also subject to self-employment tax (see the IRS page on self-employment tax).
• Paperwork: Typically the lightest. The SBA calls it the easiest structure to form, with the fewest regulations, though it comes at a price: no separation between you and the business. Local or state licenses and a DBA (“doing business as”) registration may still apply, depending on where you operate.
• Fits: Testing an idea, low-risk work, or very early stages.

You don’t file anything to become a sole proprietor. If you start doing business alone, you are one.

General Partnership: Two or More Owners, No Filing Required

• Owners: Two or more people.
• Liability: The Hartford’s business structure guide says general partners face all the liabilities of the partnership. In practice, that can include debts created by a partner’s decisions.
• Default taxation: According to the IRS, a partnership files an information return (Form 1065). Profits and losses pass through to the partners, who report their shares on their own returns.
• Paperwork: Forming one can be informal, which is exactly the risk. A written partnership agreement covering ownership splits, decisions, and exits is worth discussing with an attorney.
• Fits: Co-owners who want simplicity and accept shared personal liability. Many owners in this position choose an LLC instead.

LLC: Liability Separation With Flexible Taxes

• Owners: One or more, called members.
• Liability: The SBA describes an LLC as a structure that protects owners from personal responsibility for business debts and claims. That protection has limits: it generally doesn’t cover your own wrongful acts or personal guarantees you sign, and it can be weakened if you mix personal and business money. Keep a separate business bank account. Our guide to the best business bank accounts for LLCs shows what to compare.
• Default taxation: The IRS classifies an LLC based on its members. A single-member LLC is by default a disregarded entity, taxed like a sole proprietorship. A multi-member LLC is by default taxed as a partnership. An LLC can elect to be taxed as a corporation instead (IRS, “Limited Liability Company (LLC)”).
• Paperwork: You file formation documents with your state, usually the Secretary of State or an equivalent office. Fees, annual or biennial reports, and any franchise or entity-level taxes vary widely by state, so check your state’s filing office directly. An operating agreement is a good idea even where it isn’t required.
• Fits: Owners who want a legal barrier between personal and business assets without corporate formalities.

For the tax side, see our breakdown of single-member LLC taxes and the S corp election.

If you’d rather use a formation service than file yourself, Bizee is one option. You can also file directly with your state, which we cover in how to incorporate yourself for free.

S Corporation: A Tax Election, Not an Entity

An S corp is a corporation or LLC that has elected, through the IRS, to pass corporate income, losses, deductions, and credits through to its shareholders. According to the IRS (“S corporations”), shareholders report that flow-through on their personal returns, and the company files Form 1120-S. The election is made on Form 2553.

The IRS lists eligibility requirements, including that the company be a domestic entity, have only allowable shareholders, have no more than 100 shareholders, and have only one class of stock. Confirm the full list on the IRS page before you elect.

What changes: According to the IRS, owners who work in the business and are S corp shareholders generally must be paid reasonable compensation through payroll. That means payroll setup, payroll tax filings, and a separate business return. Some states also tax S corps at the entity level or don’t recognize the election.

Why people consider it: Distributions beyond salary generally aren’t subject to self-employment tax. That’s the source of the “save on taxes” pitch.

Whether it outweighs the added payroll cost and compliance depends on your profit and salary. That’s a question for your CPA. Our LLC vs S corp breakdown and S corp tax calculator help you frame it. Treat the calculator’s results as illustrations, not predictions.

C Corporation: The Traditional Corporation

• Owners: Shareholders. There’s no limit on the number or type of shareholders.
• Liability: Shareholders are generally not personally liable for corporate debts, subject to limits similar to an LLC’s.
• Default taxation: The IRS treats a C corporation as separate from its owners, and it files Form 1120. Profits can be taxed at the corporate level, and dividends paid to shareholders are generally taxed again on their personal returns. People often call this double taxation.
• Paperwork: Articles of incorporation, bylaws, a board, shareholder meetings, and minutes are typically expected under state corporate law.
• Fits: Businesses planning to raise outside investment or issue more than one class of stock, which the S corp structure doesn’t allow. Ask an attorney about investor expectations before choosing.

A Short Note on Nonprofits

A nonprofit is a purpose, not a tax classification. Organizations generally form under state law and then apply to the IRS for tax-exempt status, commonly under section 501(c)(3) for charitable groups. Exempt status isn’t automatic, and a nonprofit has strict rules about how its money is used.

If you want to earn a profit for yourself, this isn’t the route.

Types of Business Structures Compared in One Table

Questions to Ask Your CPA or Attorney

The part people always miss is that a good question beats a good guess. Bring these:

• Given my expected profit, would an S corp election likely cover the added payroll and compliance costs?
• What does my state charge to form and maintain an LLC or corporation, including franchise or entity-level taxes?
• Does my state recognize the S election for tax purposes?
• What reasonable salary would apply to my role?
• What liability risks does an LLC not cover in my industry, and do I need insurance?
• If I plan to bring on partners or investors, which structure should I start with?
• Can I change structures later, and what are the tax consequences?

FAQ: Choosing a Business Structure

Can I change my business structure later?

Often, yes. Many owners start as a sole proprietorship and form an LLC later, or add an S election. Each change can carry tax and legal consequences, so ask a CPA first.

Is an LLC or an S corp better?

They aren’t opposites. An LLC is a legal entity, and an S corp is a tax election an LLC can make. The real question is whether the default tax treatment or the S election fits you.

Do I need to form an LLC to protect myself?

Not legally. But without one, a sole proprietor is personally responsible for business debts, per the SBA. An LLC can reduce that exposure, though it won’t cover everything, and insurance may still matter.

What is double taxation?

It refers to C corporation income being taxed at the corporate level and then taxed again to shareholders when it’s paid out as dividends. The IRS treats a C corporation as a separate taxpayer.

Which structure is cheapest to start?

A sole proprietorship typically has the fewest filings, according to the SBA. Formation and annual costs for other structures depend on your state, so check your Secretary of State’s fee schedule.

Next Step: Narrow Your Options in Five Minutes

Take our business structure quiz to see which of these structures fits your goals, then bring your results to your CPA or attorney.

Last updated: October 14, 2026

Disclaimer: The information in this article is for educational purposes only and does not constitute legal, tax, or financial advice. Business formation rules, fees, and deadlines vary by state and change often. Always consult a qualified attorney, CPA, or tax professional before making decisions about your business.