Sole Proprietorship vs. LLC vs. S-Corp: Which Should You Choose?

The short answer to sole proprietorship vs LLC vs S-corp: a sole proprietorship and an LLC are legal business structures, while an S-corp is not a structure at all but a tax election that an LLC or corporation can choose. A sole proprietorship is the simplest and cheapest to run but offers no liability protection; an LLC gives you personal liability protection with modest paperwork; and electing S-corp taxation can lower self-employment taxes once your business earns enough profit to justify running payroll. For most first-time owners, the practical path is to start as a sole proprietor or LLC and add an S-corp election later once profits grow.

What is the difference between a sole proprietorship, an LLC, and an S-corp?

This is the point that trips up almost every new owner, so it is worth slowing down. A sole proprietorship is what you automatically become the moment you start doing business on your own without forming anything. There is no separate legal entity; you and the business are the same in the eyes of the law.

An LLC (limited liability company) is a formal legal entity you create by filing with your state. It exists separately from you, which is what creates the "liability shield" that protects your personal assets. For a deeper side-by-side, see our guide on LLC vs sole proprietorship.

An S-corp is different in kind. It is a tax classification granted by the IRS, not a business you register with your state. You first form an LLC or a corporation, then file an election (Form 2553) asking the IRS to tax that entity as an S-corp. So "LLC vs S-corp" is slightly the wrong framing: you can have an LLC that is taxed as an S-corp. The real choice is which structure to form, and then how you want it taxed.

How do they compare on liability, taxes, cost, and paperwork?

Here is the practical comparison across the four things new owners care about most.

Factor	Sole Proprietorship	LLC	S-Corp (election on an LLC/corp)
Liability	None. Personal assets are exposed to business debts and lawsuits.	Personal assets are generally protected if you keep finances separate.	Same protection as the underlying LLC or corporation.
Taxes	Pass-through; all profit hit with income + self-employment tax.	Pass-through by default; taxed like a sole prop (or partnership).	Pass-through, but only your salary owes payroll tax; distributions do not.
Cost	Free to essentially free to start.	State filing fee (~$50-$500) plus possible annual fees.	LLC costs plus payroll and higher accounting fees.
Paperwork	Minimal. Report profit on your personal return.	Formation filing, operating agreement, annual reports.	All LLC paperwork plus payroll filings and a separate business return.

Liability

This is the clearest dividing line. As a sole proprietor, if the business gets sued or cannot pay a debt, your house, car, and savings can be on the line. An LLC creates legal separation, so creditors generally can reach only business assets, provided you treat the LLC as a real separate entity: its own bank account, no mixing of personal and business money. An S-corp election does not change this either way; your protection comes from the LLC or corporation underneath it.

Taxation

All three are "pass-through" by default, meaning profits flow to your personal return and the business itself pays no separate federal income tax. The key difference is self-employment tax. A sole proprietor and a standard LLC owner pay 15.3% self-employment tax on essentially all net profit, on top of income tax.

The S-corp election changes this math. As an S-corp, you pay yourself a "reasonable salary" that is subject to payroll taxes, and you take remaining profit as distributions that are not subject to self-employment tax. If your business nets $120,000 and a reasonable salary is $70,000, only that $70,000 gets hit with payroll tax instead of the full amount. That gap is where the savings come from, and it is why owners consider the election as profits climb.

Tip: An S-corp only saves money if your profit comfortably exceeds a reasonable salary for your role. If the whole profit is a reasonable salary, there is nothing left to take as tax-favored distributions, and the extra costs erase the benefit.

Cost and paperwork

Cost tracks complexity. A sole proprietorship costs almost nothing and requires no formation filing. An LLC means a one-time state filing fee, usually somewhere between $50 and $500, and often an annual report or fee. An S-corp adds real overhead on top of the LLC: you must run formal payroll, file quarterly payroll returns, and file a separate business tax return (Form 1120-S). Most S-corp owners hire a payroll service and a CPA, which commonly runs $1,500 to $3,000+ per year.

Which one should you choose? A simple decision framework

You do not have to get this perfect on day one. Structures can evolve as your business grows. Here is a straightforward way to decide.

Testing an idea, little income, low risk? A sole proprietorship is fine to start. It costs nothing and lets you validate demand before spending on formation.
Have real customers, personal assets to protect, or any liability exposure? Form an LLC. This is the right home base for most serious first-time owners.
LLC consistently netting solid profit above a reasonable salary? Talk to a CPA about electing S-corp status to reduce self-employment tax.

As a rough rule of thumb, the S-corp election starts to make financial sense once your business is netting somewhere around $60,000-$80,000 or more in annual profit, after paying yourself a reasonable salary. Below that, the payroll and accounting costs usually eat the savings. Above it, the math tilts in your favor and keeps improving as profit grows. Your exact break-even depends on your salary, your state, and your industry, so treat the range as a signal to run the numbers, not a hard cutoff.

If you are still weighing the tradeoffs, our overview of choosing a business structure walks through more scenarios, and how to register covers the actual filing steps once you decide.

Frequently asked questions

Can an LLC be taxed as an S-corp?

Yes. This is one of the most common setups for growing small businesses. You form an LLC with your state for liability protection, then file IRS Form 2553 to have that LLC taxed as an S-corp. You keep the simpler LLC structure while gaining the S-corp tax treatment.

Do I need an LLC before electing S-corp status?

You need either an LLC or a corporation first, because an S-corp election is applied to an existing entity, not filed on its own. Most small owners start with an LLC and add the election later rather than forming a corporation from scratch.

Is a sole proprietorship ever the right long-term choice?

It can be, for very low-risk, low-revenue side businesses where liability exposure is minimal and simplicity matters most. But as soon as you have meaningful income, contracts, or personal assets to protect, an LLC is usually worth the modest cost.

Getting the order right

Choosing a structure is one decision among many when you launch, and the sequence matters: entity, then EIN, then bank account, then licenses. Scafflow gives first-time US owners a personalized, ordered launch checklist so nothing important slips through the cracks, and it is free to start.

This article is general information, not legal or tax advice. Tax rules and state requirements change and vary by situation. Consult a CPA or attorney before choosing or changing your business structure.

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