Sole proprietorship
A sole proprietorship is simply you doing business in your own name or a trade name. South Carolina's Secretary of State says sole proprietorships do not file with its office, and the office does not register DBA or trade names. You will still need any local business license and state tax registrations that apply.
Profit is reported on your personal return, and there is no legal separation between you and the business.
Best for: someone testing an idea, freelancing on the side, or running a low-risk service business who wants to start this week with minimal paperwork.

