LLC vs S-Corp vs C-Corp: Choosing the Right Business Structure
By BizCalculators Team · Last reviewed September 4, 2026
An LLC gives liability protection with pass-through taxation, electing S-Corp status can save 15.3% self-employment tax on distributions above a reasonable salary, and a C-Corp pays 21% corporate tax but allows unlimited shareholders and venture capital.
Overview of Business Structures
The three most common business structures for growing companies are LLC (Limited Liability Company), S-Corporation, and C-Corporation. Each offers different levels of liability protection, tax treatment, ownership flexibility, and administrative complexity. Your choice affects how you pay taxes, how you can raise money, and how you operate day-to-day. Many businesses start as LLCs and later convert to S-Corps for tax advantages or C-Corps to attract venture capital.
It helps to separate two decisions that people often blur: the legal entity you register with a state and the tax classification you elect with the IRS. You might form a limited liability company yet be taxed as a sole proprietor, a partnership, an S-corporation, or a C-corporation. The state filing fixes liability and ownership rules, while the federal election fixes how profit is taxed. Changing the election later is a matter of paperwork, but unwinding the entity and moving assets can trigger fees and tax consequences of its own.
LLC: Flexibility and Simplicity
An LLC provides personal liability protection (your personal assets are separate from business debts) with pass-through taxation (business income flows to your personal tax return). LLCs have minimal paperwork requirements, flexible management structures, and no restrictions on the number or type of owners (members). The main downside: all business profits are subject to self-employment tax (15.3% up to the Social Security wage base, then 2.9% Medicare tax).
Ownership mechanics are where an LLC quietly outshines a corporation. Members can split profits unevenly, so one partner might take 70% of distributions while holding a 50% stake, and profits can be allocated by agreement rather than strictly by shares. A single-member LLC is disregarded for federal tax purposes by default, while two or more members are treated as a partnership unless they elect otherwise. Note that only members who actively work in the business owe self-employment tax on their distributive share, which changes the analysis for passive investors.
S-Corp: Tax Savings for Profitable Businesses
An S-Corporation is a tax election (you can be an LLC that elects S-Corp status) that can save on self-employment taxes. In an S-Corp, you pay yourself a reasonable salary (subject to payroll taxes) and take remaining profits as distributions (not subject to self-employment tax). The savings can be substantial: on $100,000 profit with a $60,000 salary, you save 15.3% on the $40,000 distribution = $6,120. The trade-off: more paperwork, payroll requirements, and stricter IRS scrutiny on 'reasonable' salary.
Two structural limits are easy to overlook. An S-corporation may have no more than 100 shareholders, all of them U.S. citizens or residents, and only one class of stock, which rules out preferred shares or differentiated payouts. There is also a basis rule: distributions above your stock basis are taxable, and you need basis to deduct pass-through losses, so an owner who withdraws money without tracking basis can create an unexpected gain. Payroll service and an extra return typically cost several hundred dollars a year, which cuts into the savings.
C-Corp: Built for Growth and Investment
C-Corporations are separate taxpaying entities — the corporation pays corporate income tax (21% federal), and shareholders pay tax again on dividends (double taxation). The advantage: C-Corps can have unlimited shareholders, issue multiple classes of stock, and are the required structure for venture capital investment and IPOs. If you plan to raise VC funding or go public, you'll need to be a C-Corp. Most small businesses don't need this complexity.
The upfront formalities are heavier and ongoing: bylaws, a board of directors, annual meetings, and minutes that document decisions. In exchange, the structure unlocks tools a pass-through cannot easily copy, such as issuing stock options to employees and separate classes of interests for investors. A notable quirk is qualified small business stock, which can exclude a large portion of gain if the holding period and company rules are met. Corporate losses also stay inside the entity, offsetting future profit rather than your personal income.
How to Choose
Choose an LLC if: you want simplicity, liability protection, and don't mind paying self-employment tax. Elect S-Corp status if: your LLC is generating consistent profits above your reasonable salary ($60,000+ profit) and you want to save on self-employment tax. Choose a C-Corp if: you plan to raise venture capital, issue stock options to employees, or eventually go public. You can change structures as your business grows — many successful companies started as LLCs and converted later.
Run the numbers as a breakeven rather than a rule of thumb. Add up the extra costs of an S election, meaning payroll processing, a separate return, and your accountant's time, then divide by the self-employment tax rate you would otherwise pay to see the profit level where it pays for itself. That threshold moves with your state's fees. One constraint deserves early planning: an S-corporation cannot have a corporation or a nonresident alien as a shareholder, so a venture round usually forces a conversion to C-corp status.
Frequently Asked Questions
What is the difference between LLC, S-corp, and C-corp?
An LLC is a flexible legal structure with pass-through taxation and minimal compliance. An S-corp is a tax election (LLC or corporation) that lets owners take salary plus distributions to reduce self-employment tax. A C-corp is a separate taxpaying entity taxed at corporate rates, suited to investors and scaling companies.
Should my small business be an LLC or S-corp?
Start with an LLC for simplicity and pass-through taxes. Elect S-corp status when profits exceed roughly $40–50,000, because the salary-plus-distribution structure saves self-employment tax. The break-even must cover S-corp payroll and filing costs, so it isn't worth it at low profit.
What are the tax advantages of a C-corp?
C-corps offer the Qualified Small Business Stock exclusion, deductible health insurance for owners, and the ability to retain earnings at corporate rates (now 21%). They also give employee-owners some tax-advantaged benefits. The trade-off is double taxation — the corporation pays tax, then shareholders pay tax on dividends.
Can I change from an LLC to an S-corp later?
Yes. You file Form 2553 with the IRS to elect S-corp status, typically by March 15 of the tax year you want it to take effect. This is a common path: operate as an LLC early, then elect S-corp as income grows. Converting a C-corp to an S-corp is more complex.