S-Corp vs Sole Prop vs LLC vs C-Corp: Which Business Structure Fits?

Four structures cover almost every small business in America: the sole proprietorship, the LLC, the S-corp, and the C-corp. Here is the quick version. A sole proprietorship is for someone testing an idea with little at risk. An LLC is for an owner who wants liability protection without much paperwork. An S-corp is for a profitable owner-operated business looking to manage self-employment tax. A C-corp is for a company that plans to raise money from investors.

That one-paragraph answer is right more often than not. But "more often than not" is a bad standard for a decision that affects your personal liability and your tax bill every year. This guide walks through each structure in plain English, compares them side by side, and ends with practical guidance for Connecticut business owners.

One clarification before the table, because it trips up almost everyone: an S-corp is not a separate kind of entity you form at the state level. It is a tax election you make with the IRS, usually on top of an LLC or a corporation. Keep that in mind as you read the comparison.

S-Corp vs Sole Prop vs LLC vs C-Corp: Side-by-Side Comparison

What Is a Sole Proprietorship?

A sole proprietorship is what you have the moment you start doing business by yourself without forming anything. There is no separate entity. You and the business are legally the same person.

That is its strength and its weakness. Nothing to file, nothing to maintain, and profits simply land on your personal tax return. But if the business is sued or cannot pay a debt, there is no wall between the claim and your personal savings, car, or home.

A sole proprietorship makes sense while you are testing an idea with low risk: no employees, no physical premises, no contracts with real money behind them. The moment any of those appear, most owners outgrow it.

What Is an LLC?

A limited liability company is a state-law entity that separates your personal assets from the business's debts. You file a formation document with the state, adopt an operating agreement, and keep business finances separate from personal ones. Do that, and creditors of the business generally cannot reach your personal assets.

For tax purposes, an LLC is a chameleon. A single-member LLC is taxed like a sole proprietorship by default. A multi-member LLC is taxed like a partnership. Either way, the LLC itself does not pay federal income tax -- profits pass through to the owners. An LLC can also elect to be taxed as a corporation, including as an S-corp.

This flexibility is why the LLC is the default answer for most small businesses. If you want the fuller picture of how LLCs compare to partnerships and corporations, we cover it in LLC vs Partnership vs Corporation: choosing the right business structure.

What Is an S-Corp?

An S-corp is a federal tax status, not a state-law entity. You form an LLC or a corporation first, then file an election with the IRS asking to be taxed under the S corporation rules.

Why bother? Self-employment tax. In a default LLC, an active owner generally pays self-employment tax on all of the business's net earnings. Under S-corp treatment, the owner takes a reasonable salary -- taxed through payroll like any employee's wages -- and can take remaining profits as distributions, which are treated differently for employment-tax purposes. For a consistently profitable owner-operated business, that difference can matter.

The trade-off is real overhead: you must run payroll, pay yourself a defensible salary, and file a separate business tax return every year. S-corps also come with eligibility limits -- a cap on the number of shareholders, restrictions on who can own shares, and a single class of stock. That last one is a common surprise: it rules out the preference structures most outside investors expect.

We compare the two most commonly confused options head-to-head in S Corp vs. LLC: which is right for your business.

What Is a C-Corp?

A C-corp is the classic corporation: a fully separate legal entity with shareholders, a board of directors, and officers. It pays its own income tax at the entity level, and shareholders pay tax again when profits come out as dividends. That is the "double taxation" you hear about.

So why would anyone choose it? Because everything about the C-corp is built for outside capital. It can issue multiple classes of stock, grant option pools to employees, and take on an unlimited number of shareholders, including funds and foreign investors. Venture capital firms overwhelmingly expect to invest in C-corps, and many will not invest in anything else.

Double taxation also matters less than it sounds for a growth company, because early-stage startups typically reinvest profits rather than paying dividends. If you are weighing this path, our step-by-step guide to starting a C corp in Connecticut walks through the process.

Which Structure Should a Connecticut Small Business Choose?

Every situation is different, but the patterns are consistent enough to describe honestly.

Freelancers and side businesses with low risk often run as sole proprietorships for a while. That is fine as a starting point -- just recognize that the first signed contract, hire, or lease is usually the signal to form an entity.

Most Connecticut small businesses land on the LLC. Service providers, trades, consultants, small e-commerce shops, and local operating businesses get liability protection and pass-through taxation with the least ongoing burden. Connecticut LLCs do have annual state obligations, so budget for maintenance, not just formation.

Profitable owner-operated businesses look at the S-corp election. Once profits are consistently well above what you would pay yourself as a salary, it is worth running the numbers with your accountant. The structure that results is usually an LLC that elects S-corp taxation -- state-law simplicity with federal tax efficiency.

Startups planning to raise venture money form C-corps. If your plan involves institutional investors, stock options for employees, or preferred stock, the C-corp is the expected vehicle, and converting later is more expensive than starting right. For a broader look at entity choice, our free Connecticut Business Entity Selection Guide (PDF) covers the decision in more depth.

The Takeaway

Match the structure to the next two years of your business, not the next twenty. If you are testing an idea, a sole proprietorship costs nothing but leaves you exposed. If you are operating for real, form an LLC. If you are profitable well beyond your own salary, ask your accountant whether an S-corp election saves you money. If you are raising from investors, form a C-corp. And whichever you choose, keep business and personal finances separate -- the liability protection you filed for depends on it.

If you want help choosing or forming the right entity, book a $50 consultation. We work with business owners across Connecticut, New York, and Massachusetts.

Attorney Advertising. This article is general information, not legal or tax advice for your specific situation.