Business Entity Types: Sole Prop, LLC, S-Corp, C-Corp Compared

Four Structures, Wildly Different Outcomes

Over 33 million small businesses operate in the United States, and the legal structure each chose at formation shapes taxes, liability exposure, and fundraising ability for the life of the company. A sole proprietor with $200,000 in annual revenue pays self-employment tax on every dollar of profit and has zero liability protection. An identical business structured as an S-Corp paying a $90,000 salary saves approximately $13,000 per year in FICA taxes—and a creditor cannot touch the owner's personal bank account. Structure is not paperwork. It is financial architecture.

Sole Proprietorship: The Default That Most Outgrow

Any individual conducting business without registering a separate entity is automatically a sole proprietor. No formation documents are required, though a DBA (Doing Business As) filing may be needed to operate under a trade name. The IRS treats the business and owner as identical—all income, deductions, and liabilities flow directly to Schedule C.

• Formation cost: $0–$50 (DBA filing only)
• Liability: Unlimited personal liability — business debts are personal debts
• Taxation: All net profit subject to SE tax (15.3% up to $160,200, then 2.9%)
• Fundraising: Cannot issue equity; investors cannot hold ownership interest
• Best for: Freelancers, side gigs, very early-stage testing

LLC: Protection With Pass-Through Simplicity

The Limited Liability Company combines personal liability protection (similar to a corporation) with the tax simplicity of a pass-through entity. Created under state law, an LLC requires Articles of Organization filed with the state and typically an Operating Agreement governing ownership and management. Formation costs range from $50 (Kentucky) to $500+ (Massachusetts).

The shield holds — until pierced by fraud.

• Personal liability protection for business debts and lawsuits (with proper maintenance)
• By default: single-member taxed as sole proprietor, multi-member as partnership
• Can elect S-Corp or C-Corp tax treatment by filing with the IRS
• No stock structure — ownership via membership units
• Annual state fees: $0 (most states) to $800+ (California)

S-Corporation: Tax Efficiency for Owner-Operators

An S-Corp is a tax election, not a standalone legal entity. A corporation (or LLC) files IRS Form 2553 to be taxed as an S-Corp. The primary benefit is the salary/distribution split: owner-employees pay FICA only on wages, not on additional distributions. Pass-through taxation means no corporate income tax.

S-Corp restrictions make it unsuitable for venture-backed companies seeking multiple share classes or institutional investors. It is purpose-built for profitable small and mid-size businesses with domestic, closely held ownership.

C-Corporation: The Default for Scalable Companies

All corporations are C-Corps by default unless they elect S-Corp status. A C-Corp is a fully independent legal entity, taxed at the corporate level (21% flat rate under current law) and again when profits are distributed as dividends to shareholders — the "double taxation" critique. However, the C-Corp is the only structure that permits unlimited shareholders, multiple share classes (common and preferred), and foreign ownership, making it the required vehicle for venture capital financing.

• Corporate tax rate: 21% flat (Tax Cuts and Jobs Act, 2017)
• Qualified Small Business Stock (QCBS) exclusion: up to 100% capital gains exclusion on sale after 5 years if conditions are met
• Stock options (ISOs and NSOs) are most powerful in C-Corp structures
• Delaware C-Corps are the overwhelming default for VC-backed startups

Side-by-Side Comparison

Choosing Based on Business Stage

Entity selection decisions are not permanent—conversion is possible—but mid-stream restructuring creates tax events and legal complexity. Early decisions should account for likely trajectories, not just current circumstances.

• Testing an idea with low revenue: Sole proprietorship or single-member LLC (simplicity wins)
• Profitable freelancer or service business above $60K net: LLC with S-Corp election
• Planning to raise outside capital: Delaware C-Corp from the start
• Real estate holding: LLC (pass-through losses, liability insulation, flexibility)
• Professional services (law, medicine): PLLC or PC depending on state rules

The State Law Overlay

Entity formation is governed by state law, which varies significantly. Delaware is the dominant incorporation jurisdiction for corporations due to its sophisticated Court of Chancery and well-developed case law. Wyoming and Nevada offer LLCs with strong charging-order protections and no state income tax. California imposes an $800 minimum franchise tax on any entity organized or doing business in the state, regardless of profitability—affecting decisions for California-based founders.

This article is for informational purposes only and does not constitute financial or tax advice.