One of the first decisions every new business owner faces is also one of the most confusing: what kind of business structure should you set up? Sole proprietor? LLC? S-corp? The labels get thrown around, but the actual differences — what they mean for your liability, your taxes, and your paperwork — rarely get explained in plain language.
This guide walks through what each structure actually is, the trade-offs that matter, and a simple framework for deciding which one fits where you are right now. As a note up front: the right structure depends on details specific to your situation. Use this as background, then make the final call with a CPA or attorney who knows your numbers.
This is the default. The moment you start doing business under your own name, you're a sole proprietor — no paperwork required, no filings, no setup. It's the simplest possible structure and it costs nothing to start.
The catch: there is no legal separation between you and the business. Legally, you and your business are the same entity. Your business's debts are your debts. Your business's lawsuits are lawsuits against you personally. Income from the business is just personal income on your tax return (Schedule C).
An LLC is a legal entity you create by filing paperwork with your state. It puts a wall between you (the owner) and the business. If the LLC is sued or runs up debt, your personal assets — your home, your savings, your car — are generally protected, as long as you keep business and personal finances clearly separate.
By default, an LLC is taxed exactly like a sole proprietorship (or like a partnership if there are multiple owners). The IRS doesn't see the LLC as a separate tax entity unless you elect otherwise. So the LLC primarily changes your liability picture, not your taxes — though it gives you the option to change your tax treatment later.
An S-corp is not a business structure you form — it's a tax election you make. You first create an LLC (or a corporation), then file IRS Form 2553 to elect S-corp tax treatment.
The reason people elect S-corp status: tax savings on self-employment tax. With a sole proprietor or default-LLC, every dollar of profit gets hit with self-employment tax (about 15.3%). With S-corp treatment, you pay yourself a "reasonable salary" subject to payroll taxes, and the rest of the profit comes out as distributions that aren't subject to self-employment tax. The savings can be real — but only above a certain income level, because S-corp status comes with extra costs and complexity.
Liability is the number one reason most owners move beyond sole proprietor.
Sole proprietor: No liability protection. A claim against your business is a claim against you personally.
LLC: Personal asset protection in most cases, as long as you maintain the corporate veil — meaning you keep business and personal finances genuinely separate (separate bank account, separate credit card, no commingling) and follow state filing requirements. The veil can be pierced if you treat the LLC as an extension of your personal accounts.
S-corp (LLC with S-corp election): Same liability protection as an LLC. The S-corp election is a tax matter, not a liability matter.
One important note: liability protection is not absolute. Personal guarantees on business loans, your own negligence, and intentional misconduct can all cut through the protection. Business insurance is the other half of the picture, no matter your structure.
Sole proprietor and default LLC: All profit flows to your personal return. You pay regular income tax plus 15.3% self-employment tax on the full amount.
S-corp election: You split profit into salary (subject to payroll taxes) and distributions (not subject to self-employment tax). On a $100,000 profit, paying yourself a $60,000 reasonable salary could save you several thousand dollars per year — but you also have to run payroll, file additional tax forms, and possibly pay an accountant for the more complex return. Most CPAs say the S-corp math doesn't start to make sense until profit is somewhere around $40,000–$60,000 a year, depending on your situation.
Important: the IRS scrutinizes S-corp salaries. Pay yourself too little to dodge payroll taxes and you can trigger an audit and penalties. The "reasonable salary" needs to actually be reasonable for your role.
Sole proprietor: Nothing to file to start. You may need a local business license or a "doing business as" (DBA) registration if you operate under a name other than your own. Annual cost: essentially zero.
LLC: File articles of organization with your state ($50–$500 depending on the state), get an EIN from the IRS (free), open a business bank account. Most states charge an annual or biennial fee to keep the LLC active ($0–$800+ depending on the state). Some require an annual report.
S-corp: Everything an LLC requires, plus payroll setup, quarterly payroll filings, a separate corporate tax return (Form 1120-S), and W-2s and K-1s at year end. Most owners use a payroll service and a CPA for this. Real annual cost above an LLC: typically $1,000–$3,000+ in service fees.
Use these questions to narrow it down before you bring it to a professional.
If clients can sue you, if you have employees, if you handle other people's property, or if your work could cause real harm if it goes wrong — you need liability protection. Move past sole proprietor to an LLC.
If you're a low-risk solo operator (a freelance writer, a tutor, a graphic designer working with small clients), you can usually start as a sole proprietor and form an LLC later as the business grows.
Below ~$40,000–$50,000 in annual profit, the S-corp election usually doesn't pay for itself once you account for payroll services, additional tax prep, and your time. Stick with the simpler default-LLC tax treatment.
Above that range, run the numbers with a CPA. If the self-employment tax savings clearly exceed the added cost of S-corp compliance, the election starts to make sense.
Planning to take on outside investors, issue equity to employees, or eventually sell the business? Those plans push you toward more formal structures sooner. A solo lifestyle business has very different needs than something you're building to scale.
Most owners move through these in stages. A sensible path looks like:
You don't have to start at the most complex structure on day one. You just have to know when you've outgrown the one you have.
Sole proprietor is simplest but offers no protection. LLC adds a wall between you and the business with manageable cost and paperwork. S-corp election is a tax move that can save real money, but only above a certain profit level, and only if you're willing to take on the added complexity.
The right answer for your business depends on your industry, your revenue, your risk profile, and your long-term plans — details a CPA or business attorney should weigh in on before you file anything. Clear Passage Solutions' small business support can help you set up an LLC, get an EIN, open a business bank account, and build the back-office structure (bookkeeping, payroll, vendor setup) that any of these structures depends on.
Book a free consultation and let’s walk through structure, setup, and the back-office systems your business needs from day one.
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