What Is a Sole Proprietorship?
A sole proprietorship is the default legal structure for a US freelancer — zero setup cost, full personal liability, all income taxed on the owner's personal return via Schedule C.
How sole proprietorship works
A sole proprietorship costs $0 to form, makes you and your business one legal entity, and reports all net profit on Schedule C of your personal Form 1040. The IRS treats you as a sole proprietor the moment you take freelance income without registering an LLC or corporation — no paperwork required. You keep 100% of profit, but you also carry 100% of liability: a client lawsuit reaches your personal bank account, car, and home, because no legal wall separates them.
Profit flows straight to your personal return, where it gets hit twice. First, the 15.3% self-employment tax covers Social Security (12.4%) and Medicare (2.9%) on net earnings. Second, that same profit stacks on top of any other household income for federal income tax, landing in brackets from 10% to 37%. A sole proprietor reporting $80,000 of net profit owes roughly $11,304 in self-employment tax before a single dollar of income tax.
This structure directly shapes your pricing. Because the 15.3% SE tax has no employer to split it with, your rate must absorb a cost a W-2 employee never sees. Add that 15.3% on top of your target take-home and your overhead, then set your floor rate accordingly. A freelancer who prices like an employee — ignoring SE tax — effectively gives the IRS a 15.3% discount out of pocket every quarter.
Example
Maya, a sole proprietor copywriter billing $90,000
Maya freelances with no LLC, so she's a sole proprietor by default. In 2025 she invoices $90,000 and deducts $8,000 in business overhead (software, home office, a laptop), leaving $82,000 net profit on Schedule C. Self-employment tax applies to 92.35% of that — $75,727 — at 15.3%, costing her $11,586. She deducts half of it ($5,793) before income tax. Filing single, her federal income tax on the remaining profit runs about $12,400. Total federal bill: roughly $23,986 on $82,000, an effective rate near 29%. The lesson for her rate card: to clear $58,000 in take-home, Maya can't price at $58,000 of billings — she has to bake the 15.3% SE tax and her overhead into every project fee, which is why her floor rate sits well above what an equivalent salaried writer would consider 'enough.'
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