LLC vs. S Corp vs. Sole Proprietorship: How to Choose

Sole proprietorship: the default you're already in

Do business alone without forming anything, and you're a sole proprietor automatically: no filing, no cost, no separateness. Income lands on your personal tax return (pass-through taxation), and you'll owe self-employment tax on the profits. Maximum simplicity.

The price of that simplicity is the missing wall: legally, you are the business. Every business debt is your personal debt, and every lawsuit against the business is a lawsuit against your house and savings. That's fine for a low-risk freelance practice earning modest income. It is reckless for anything with premises customers walk into, employees, products that can hurt someone, or meaningful debt.

Honest use case: testing an idea cheaply, low-liability service work, income too small to justify overhead. The moment real liability or real income appears, the default has been outgrown.

LLC: the liability wall, with simple taxes

A limited liability company creates a separate legal person. The business owns its debts and faces its own lawsuits, and your personal assets generally sit behind a wall. By default, the taxes don't change much: a single-owner LLC is still taxed like a sole proprietorship, income passing through to your return. So the LLC's core purchase is the wall, while keeping the simple taxes, which is why it's the standard choice for most small businesses.

Two honest caveats. First, the wall must be maintained: keep business and personal money strictly separate, keep records, and never treat the company account as a personal wallet. Courts set aside the wall of owners who ignore its existence (piercing the veil). Second, the wall has gaps you create yourself: banks and landlords routinely require personal guarantees, which put your personal assets back on the line for those specific debts regardless of the LLC.

Cost: state filing fees and, in some states, annual fees or franchise taxes. Both are usually modest against the protection purchased.

S corp: a tax election, not an entity

The S corp is widely misunderstood: it isn't a different kind of company you form instead of an LLC. It's a tax election an eligible LLC (or corporation) can make. The wall stays. What changes is how the owner's income is taxed.

The mechanism: as an S corp owner-operator, you pay yourself a reasonable salary (which bears payroll taxes) and can take remaining profits as distributions (which don't bear self-employment tax). For a sufficiently profitable business, that split can meaningfully reduce total self-employment tax versus a default LLC, where the entire profit bears it.

There are two catches. First, the salary must be genuinely reasonable for the work: pay yourself an artificially tiny salary to maximize distributions and the tax authority can reclassify them. Second, the election brings real overhead (payroll processing, a separate tax return, stricter compliance). The savings only beat the overhead above a certain profit level, which is why "should I elect S corp?" is a math question for a CPA with your actual numbers, not an identity upgrade. Below the threshold, the election costs more than it saves.

The two questions that decide it

Question one is risk. If this business were sued or defaulted, what would I lose? If the honest answer includes your house or savings and the exposure is real (premises, employees, products, debt), the liability wall stops being optional. That points to an LLC (or beyond) regardless of taxes.

Question two is profit. Is the business profitable enough that self-employment tax on all of it clearly exceeds the cost and hassle of running payroll and an extra return? If yes, the S corp election is worth pricing out with a CPA. If not yet, the default LLC taxation is simpler and usually right.

Notice the pattern: structure follows the business, not the other way around. Owners get into trouble when they choose structures as identity ("a corporation sounds serious") rather than as answers to risk and tax questions. They pay for complexity they don't need, or skip a wall they very much do. And the decision isn't permanent: businesses commonly start as sole proprietorships, form an LLC when liability appears, and elect S corp when the profits justify it.

Key takeaways

• Every structure sets two dials: where liability stops, and how income is taxed. Choose by the dials, not by what sounds impressive.
• Sole proprietorship: free and simple, but no wall, so every business liability is personally yours. Fine for low-risk testing, and outgrown fast.
• LLC: buys the liability wall while keeping simple pass-through taxes, and it is the standard small-business choice. The wall only holds if you maintain the separation.
• S corp is a tax election, not an entity: a reasonable-salary-plus-distributions split that can reduce self-employment tax for sufficiently profitable owner-operators, and worth it only above the overhead threshold.
• Two questions decide it: how much liability exposure is real, and whether the profits justify the S corp's overhead. Confirm the specifics with a CPA. This is general education, not legal or tax advice.

Frequently asked questions

Do I need an LLC to start a business?

No. You can start as a sole proprietor with no filing at all, and for low-risk, low-income testing that's often reasonable. The LLC becomes important when real liability exposure appears (premises, employees, products, contracts, debt), because it creates the legal wall between business obligations and your personal assets.

When is an S corp worth it?

Generally when the business is profitable enough that the self-employment tax savings from the salary/distribution split clearly exceed the added costs: payroll processing, a separate business tax return, and stricter compliance. Below that profit level the election costs more than it saves. The exact threshold depends on your numbers and state, so run it with a CPA.

Does an LLC protect my personal assets completely?

No protection is absolute. The LLC's wall generally shields personal assets from business debts and lawsuits, but only if you maintain the separation (separate accounts, real records, no commingling). It doesn't cover debts you personally guarantee, your own professional malpractice, or certain obligations like withheld payroll taxes. Insurance remains the essential first layer alongside the entity.