One of the most consequential decisions a small business owner makes is how to structure the entity — and it's often made too quickly, without adequate tax modeling. The differences between an LLC, S-Corporation, and C-Corporation affect not just your annual tax bill, but your ability to raise capital, distribute profits, and eventually exit the business.
Sole proprietorship: the default
Without any formal entity, you operate as a sole proprietor. Business income and expenses flow directly onto Schedule C of your personal return. All net profit is subject to self-employment tax (15.3%). There's no liability protection — your personal assets are exposed to business debts and judgments.
LLC: flexibility first
A Limited Liability Company provides liability protection while defaulting to pass-through taxation. By default, a single-member LLC is taxed as a sole proprietorship (Schedule C) and a multi-member LLC is taxed as a partnership (Form 1065). The key advantage is flexibility: an LLC can elect to be taxed as an S-Corp or C-Corp without changing the underlying legal structure.
LLCs are the most common choice for small businesses precisely because they provide protection without prescribing a tax treatment.
S-Corporation: the self-employment tax reducer
An S-Corporation is not a separate entity type — it's a tax election available to both corporations and LLCs. Under S-Corp status, the business pays you a reasonable salary (subject to payroll taxes) and distributes remaining profits to you as the shareholder. Distributions are not subject to self-employment tax.
This is the primary advantage: on $200,000 of business income, the difference between sole proprietor taxation and a well-structured S-Corp can be $10,000–$20,000 annually in saved self-employment tax. The tradeoff is compliance cost: payroll, S-Corp return (Form 1120-S), and reasonable compensation documentation.
The S-Corp election generally makes financial sense once business profit consistently exceeds $50,000–$80,000 per year — below that threshold, the compliance cost often exceeds the savings.
C-Corporation: when it makes sense
A C-Corporation is taxed at the entity level (currently 21% flat rate) and then again when profits are distributed to shareholders as dividends. This "double taxation" makes C-Corps unattractive for most small businesses seeking to extract profits.
The C-Corp makes sense in specific situations:
- Venture-backed startups where investors require a C-Corp structure
- Businesses planning to retain and reinvest profits rather than distributing them
- Companies with qualified small business stock (Section 1202) planning for an acquisition
- Businesses with multiple share classes needed for complex capitalization tables
Making the right choice
The right entity depends on your current income, growth trajectory, exit strategy, and how you'll use profits. A new freelancer earning $40,000 has different needs than a consulting firm generating $500,000. Model the numbers with a CPA before you commit — because changing structures later has costs and complications.
