Sole Proprietor vs LLC vs S-Corp: A South Carolina Tax Comparison

These three get compared as if they were three points on one scale. They are not. Sole proprietorship and LLC are legal structures; S-Corp is a tax election that sits on top of one of them. Understanding that removes most of the confusion, because it separates the liability question from the tax question entirely.

The default. Trade in your own name and you are one, with no formation, no filing and no cost.

Tax: business profit goes on Schedule C of your personal return, subject to income tax and self-employment tax. Liability: none — your personal assets stand behind every business obligation. Admin: minimal.

Suits: testing an idea, very low-risk activity, or a side business with modest income. The liability exposure is the reason to move on from it, and that reason usually arrives before the tax reason does.

A legal structure providing separation between business and personal assets. Formed with the Secretary of State, with a modest fee and a registered agent requirement.

Tax: by default, nothing changes. A single-member LLC is taxed exactly as a sole proprietorship; a multi-member LLC is taxed as a partnership. This is the point most people get wrong — forming an LLC does not reduce your tax.

Liability: separation, provided you maintain it. Commingling funds, failing to keep the entity current, or treating the business account as a personal one can allow that separation to be challenged. The protection is real but it is conditional on behavior.

Suits: almost any business past the experimental stage. It is the sensible default.

Not an entity but a tax election, made by an LLC or corporation. It changes how profit is taxed rather than what the business legally is.

The mechanism: the owner working in the business takes a reasonable salary through payroll, subject to payroll taxes. Remaining profit is taken as distribution, which is subject to income tax but not to self-employment tax. That difference is the entire benefit.

The cost: payroll must actually be run, a separate business return must be filed, and the salary must be defensible. Those obligations carry real fees and real administration, and they apply whether or not the business had a good year.

Which means there is a threshold. Below a level of profit, the cost exceeds the saving and electing is a net loss. Above it, the saving grows with profit. Where exactly that line falls depends on your profit, your payroll cost and your compliance costs — which is why it is a calculation rather than a rule, and why it should be revisited annually rather than decided once.

The saving comes from characterising profit as distribution rather than salary, which creates an obvious incentive to set the salary low. The IRS is entirely aware of this, and unreasonably low owner compensation in a profitable S-Corp is among the most reliably examined issues for small businesses.

Reasonable means what the role would command paid to someone else — based on duties, hours, experience and what comparable positions pay. Paying yourself nothing while taking substantial distributions is the version that draws attention, and the correction includes back payroll taxes and penalties.

A defensible salary is not the lowest you can justify. It is one you would be comfortable explaining.

Start as a sole proprietor or go straight to an LLC. Operate as an LLC while the business establishes itself. Once profit is consistently at a level where the numbers work, elect S-Corp treatment — and check annually rather than assuming the answer from an earlier year still holds.

Moving up is straightforward. Moving back down is more awkward, which is an argument for not electing prematurely on the strength of one good year.