Sole Proprietorship vs LLC vs Corporation: How to Choose a Business Structure
Choosing a business structure sounds like a legal formality, but it decides how much of your personal life is on the line, how you are taxed and how easily you can bring in partners or investors later. This comparison explains the main options in plain language and gives you a way to decide.
Key takeaways
- A sole proprietorship is the simplest and cheapest option, but you and the business are legally the same person.
- An LLC separates your personal assets from business debts and claims while keeping taxes simple.
- A corporation is the standard choice when you plan to raise outside investment or issue shares to employees.
- In the US, an LLC can elect S corporation tax treatment to reduce self-employment tax once profits are high enough.
- Rules and names differ by country and by state. Confirm the details locally before you file anything.
Every business has a legal structure, whether or not you chose one. If you start selling without registering anything, you are a sole proprietor by default in the US and most other countries. That is fine for a weekend side project. It becomes a problem the day a customer sues, a loan goes bad or an investor asks for equity.
This guide compares the four structures most small businesses in the US choose between: sole proprietorship, limited liability company (LLC), S corporation and C corporation. Partnerships get a brief mention because they behave much like sole proprietorships with more than one owner. The last section covers how the same ideas map onto other countries.
The four structures at a glance
| Structure | Personal liability | How it is taxed | Setup and upkeep | Best for |
|---|---|---|---|---|
| Sole proprietorship | Unlimited: you are the business | Profit on your personal return, plus self-employment tax | Nothing to file beyond local licenses | Low-risk solo work, testing an idea |
| LLC | Limited to what you put in | Pass-through by default; can elect S or C corp treatment | State filing, annual report, small yearly fee in most states | Most small businesses with any real risk or assets |
| S corporation | Limited | Pass-through; owner takes a salary plus distributions | Corporate formalities, payroll, separate tax return | Profitable owner-operated businesses |
| C corporation | Limited | Corporate tax, then tax on dividends | Board, bylaws, minutes, separate return | Startups raising venture capital, businesses planning to reinvest profits |
Sole proprietorship: the default
A sole proprietorship is you, doing business. There is no separate legal entity. You may need a local business license and, if you trade under a name other than your own, a "doing business as" registration, but that is all. Income and expenses go on Schedule C of your personal US tax return.
The cost of that simplicity is unlimited liability. If the business cannot pay a debt or loses a lawsuit, creditors can pursue your personal savings, car and home. There is also no way to sell a share of the business, because there is nothing separate to sell.
A sole proprietorship makes sense when the risk is low and the business is small: a freelance writer, a weekend market stall, a consultant testing whether there is demand. Once there are real assets to protect, employees, customers on your premises or contracts worth suing over, most owners move to an LLC.
A note on partnerships
Two or more people doing business together without forming an entity are a general partnership by default. It works like a multi-owner sole proprietorship, including unlimited personal liability, and each partner can be held responsible for the others' business actions. If you are going into business with someone, form an LLC or corporation and write an operating agreement instead.
LLC: liability protection without the paperwork
A limited liability company is a separate legal entity registered with a state. It owns the business assets, signs the contracts and carries the debts. If it fails or is sued, your loss is normally limited to what you invested, as long as you keep business and personal finances separate and do not personally guarantee the debts.
By default, an LLC is taxed as a pass-through: a single-member LLC files like a sole proprietorship and a multi-member LLC like a partnership. The LLC itself pays no federal income tax; profits flow to the owners' returns. That keeps taxes simple while giving the liability protection a sole proprietorship lacks.
Setup costs vary widely by state. Filing fees range from under $50 to several hundred dollars, and some states charge an annual fee or tax regardless of income. California, for example, charges LLCs an $800 annual franchise tax. Most states also require a short annual or biennial report.
Common mistake
Forming an LLC and then running the business out of a personal bank account. Mixing funds is one of the main ways courts "pierce the corporate veil" and hold owners personally liable. Open a separate business account the week you register, pay yourself from it, and keep the LLC's records in order.
S corporation: a tax election, not a different entity
An S corporation is not a separate kind of company. It is a tax status that an LLC or a corporation can elect with the IRS by filing Form 2553. The business stays a pass-through, so profits are taxed once on the owners' returns, but owners who work in the business must be paid a reasonable salary through payroll. Only the remaining profit, taken as distributions, avoids self-employment tax.
That split is the whole point. If an LLC earns $120,000 in profit, the owner pays self-employment tax on all of it. As an S corporation paying a $70,000 salary, the owner pays payroll taxes on the salary and takes $50,000 as distributions free of self-employment tax. The savings must be weighed against the cost of running payroll, filing a separate corporate return and the IRS's requirement that the salary be reasonable for the work done.
S corporations have limits: no more than 100 shareholders, all of whom must be US citizens or residents and generally individuals, and only one class of stock. Those limits rule out venture capital investors and most foreign owners.
Worked example
A solo web developer starts as a sole proprietor with $30,000 in first-year profit. The paperwork of an S corporation would cost more than it saves at that level. In year two she forms an LLC when she signs a contract with a larger client who requires it and wants liability protection. By year four, profit is $110,000. Her accountant estimates that electing S corporation status and paying herself a $65,000 salary would save several thousand dollars a year in self-employment tax after the extra payroll and filing costs. She files Form 2553 for the next tax year.
C corporation: built for investors
A C corporation is the standard corporation. It is a fully separate legal entity with shareholders, a board of directors and officers. It pays its own federal income tax, a flat 21% since the 2017 US tax law, and shareholders pay tax again on any dividends. That "double taxation" is the main reason small owner-operated businesses avoid it.
For a startup planning to raise money, however, a C corporation is usually the only workable choice. Venture capital funds generally cannot invest in pass-through entities, stock options for employees are far simpler to issue, and the structure handles multiple classes of shares, convertible notes and future acquisitions cleanly. Many US startups incorporate in Delaware because its corporate law and courts are predictable and investors expect it, then register as a foreign entity in the state where they actually operate.
A C corporation also lets profits stay in the company and be reinvested at the corporate rate without flowing to owners' personal returns, which can suit businesses that plan to grow rather than distribute.
How to decide: five questions
- What could go wrong, and how badly? If a mistake, accident or unpaid debt could cost more than you could afford to lose personally, you need limited liability. That means an LLC or a corporation, not a sole proprietorship.
- How much profit will the business make? Below roughly $40,000 to $50,000 in annual profit, the added costs of an S corporation usually outweigh the tax savings. Above that, ask an accountant to run the numbers.
- Who else will own part of it? One owner: sole proprietorship or LLC. Co-founders: LLC or corporation with a written agreement. Outside investors or employee stock options: C corporation.
- How much administration can you handle? A sole proprietorship needs almost none. An LLC needs an annual report and separate books. A corporation needs bylaws, minutes, a board and a separate tax return. Be honest about whether you will keep up.
- Where will you operate? Fees, annual taxes and reporting differ by state. Registering in a state you do not do business in usually means paying fees in two states, so for most small businesses the home state is the right answer.
Choose an LLC when
- You want liability protection with the least paperwork
- Profits will be paid out to owners rather than reinvested
- You have one owner or a few partners
- You may want the S corporation election later
Choose a C corporation when
- You plan to raise venture capital or angel funding
- You will issue stock options to employees
- You expect to reinvest most profits for years
- You expect foreign owners or many shareholders
Pro tip
You can change structure later, and many businesses do: sole proprietor to LLC, LLC to S corporation election, LLC to C corporation before a funding round. Some moves are simple and some have tax consequences, especially moving out of a C corporation. Start with the structure that fits the next two to three years, not the one that fits the ten-year dream.
Outside the US: the same choices under different names
Most countries offer the same three tiers: an unregistered individual trader, a limited-liability company for small businesses, and a full corporation for larger or investor-backed firms.
- United Kingdom: sole trader, partnership, or a private limited company (Ltd) registered with Companies House. The Ltd is the usual choice for liability protection and is taxed under corporation tax, with owners paid by salary and dividends.
- Canada: sole proprietorship, partnership, or a corporation registered federally or provincially. There is no direct LLC equivalent; small corporations get a reduced tax rate on active business income.
- Australia: sole trader, partnership, or a proprietary limited company (Pty Ltd) registered with ASIC. Trusts are also common for family businesses.
- Germany: Einzelunternehmer, or a GmbH limited company, with the UG as a lower-capital entry version.
- Singapore: sole proprietorship or a private limited company (Pte Ltd) registered with ACRA.
The questions in this guide apply everywhere. What changes is the filing body, the minimum capital, the tax rates and the paperwork. A local accountant or your national business registry will have a plain-language comparison for your country.
Your decision checklist
- Write down the worst realistic loss the business could cause and whether you could absorb it personally
- Estimate profit for the next two years
- List every current and likely future owner, including investors and employees with equity
- Look up filing fees, annual fees and reporting rules for your state or country
- Book one hour with an accountant to check the tax side before filing
- Register the entity, get a tax ID, open a business bank account and sign an operating agreement or bylaws
- Set a reminder to review the structure every year or whenever profit or ownership changes
Frequently asked questions
Can I start as a sole proprietor and switch to an LLC later?
Yes, and it is very common. In the US you register the LLC with your state, get a new tax ID, open a business account and move contracts and licenses across. Tell your bank, insurer and clients. The main thing to avoid is operating for years with growing risk while putting off the switch.
Does an LLC protect me from everything?
No. It does not protect you from your own professional negligence, from debts you personally guaranteed, from unpaid payroll taxes, or from claims where you mixed personal and business funds. Insurance covers the first; discipline covers the rest.
Is a single-member LLC taxed differently from a sole proprietorship?
By default, no. The IRS treats a single-member LLC as a "disregarded entity," so you file Schedule C and pay self-employment tax exactly as a sole proprietor would. The difference is legal protection, not tax, unless you elect S or C corporation treatment.
Should I incorporate in Delaware or Wyoming even though I live elsewhere?
Usually not for a small local business. You would still have to register as a foreign entity and pay fees in your home state, so you end up paying twice. Delaware makes sense mainly for startups raising venture capital, because investors expect it.
Related reading
The bottom line
For most small businesses the answer is an LLC: liability protection, simple taxes and modest paperwork. Stay a sole proprietor only while the risk is low and the business is small. Elect S corporation treatment when profit is high enough for the self-employment tax savings to beat the extra costs. Form a C corporation when investors or employee equity are part of the plan. Whatever you choose, confirm the local rules, keep business money separate, and revisit the decision as the business grows.
