Choosing the Right Business Entity: LLC vs S-Corp vs C-Corp

Why the entity choice matters

Choosing a business entity is one of the highest-leverage decisions a new business owner makes, and it is often made badly. People default to whatever their friends chose, copy what they saw on a TV show, or follow the path of least resistance on a Secretary of State website. Years later, the cost of that choice surfaces — in unexpected tax bills, in personal liability for business debts, or in the inability to bring on investors.

This guide explains the four most common structures: sole proprietorship, partnership, limited liability company (LLC), and corporation (C-Corp and S-Corp). It is not a substitute for advice from a qualified business-law attorney and CPA, but it will give you a framework for that conversation.

Sole proprietorship

A sole proprietorship is not a separate entity. You are the business. There is no paperwork to form one, no separate tax return (you report income and losses on your personal Form 1040 Schedule C), and no liability shield. If the business is sued or cannot pay its debts, your personal assets are exposed.

Sole proprietorships make sense for very low-risk, low-revenue activities — freelance consulting, tutoring, hobby businesses that have not yet generated meaningful revenue. They are easy and cheap. They are also dangerous. A single lawsuit can wipe out your house, your retirement, and your children's college fund.

The moment your business carries meaningful liability risk (customers, employees, physical premises, contracts) or generates meaningful revenue, you should form a separate entity.

Partnership

A partnership is what you have when two or more people operate a business together without forming a separate entity. General partnerships, like sole proprietorships, expose each partner's personal assets to the partnership's liabilities. A partner can also bind the partnership without the other partners' consent, and the other partners are liable for those obligations.

Limited partnerships (LPs) and limited liability partnerships (LLPs) exist, but they are typically used for specific purposes — family businesses, professional practices (law, accounting, architecture), and certain investment structures. Most new businesses should not start as partnerships.

Limited liability company (LLC)

The LLC is the most common structure for small and mid-sized businesses in the United States. It combines the liability protection of a corporation with the tax flexibility of a partnership.

Liability protection. Members (LLC owners) are not personally liable for the debts and obligations of the LLC. If the LLC is sued or cannot pay its bills, creditors can reach only LLC assets — not the members' personal assets (with limited exceptions for "piercing the corporate veil," discussed below).

Tax flexibility. By default, an LLC with one member is taxed as a sole proprietorship, and an LLC with multiple members is taxed as a partnership. Both "pass through" to members' personal returns, avoiding entity-level tax. Members can elect to be taxed as a C-Corp or S-Corp instead by filing the right forms with the IRS.

Management flexibility. LLCs can be member-managed (all members run the business) or manager-managed (members elect managers). Operating agreements can be tailored to almost any governance structure.

Piercing the veil. Despite the liability shield, courts can pierce the corporate veil and hold members personally liable in limited circumstances: commingling personal and business funds, failing to maintain corporate formalities, undercapitalizing the business at formation, or using the LLC to commit fraud. The shield is strong but not absolute. Maintaining a separate bank account, holding annual meetings (even if just one member), and documenting major decisions are essential.

When to choose an LLC. LLCs are ideal for most small and mid-sized businesses: real estate holdings, consulting firms, professional services, restaurants, retail, e-commerce, single-purpose entities. They are the default structure for new businesses unless there is a specific reason to choose something else.

C-Corporation

The C-Corp is the traditional large-business structure. It is a separate legal entity with shareholders, directors, and officers. The C-Corp pays entity-level federal income tax (currently 21 percent), and shareholders pay a second layer of tax on dividends.

Why would you accept double taxation? Two reasons.

First, the C-Corp is the only structure that easily accommodates outside investors. Venture capital funds, private equity, and most institutional investors require C-Corp equity. They want preferred stock, liquidation preferences, and the ability to grant equity to employees via incentive stock options that qualify for favorable tax treatment. LLCs and S-Corps cannot easily provide these features.

Second, certain business models — particularly those that retain earnings for reinvestment — can benefit from the corporate tax rate being lower than the individual rate at certain income levels.

C-Corps are also more expensive to maintain. They require articles of incorporation, bylaws, board minutes, annual shareholder meetings, separate tax returns (Form 1120), and often payroll through a third-party administrator.

When to choose a C-Corp. Choose a C-Corp if you plan to raise venture capital or private equity, if you intend to take the company public, if you have international operations, or if you want to retain significant earnings inside the business. Most venture-backed startups (and almost all companies aiming to be acquired or go public) are Delaware C-Corps.

S-Corporation

The S-Corp is a tax election available to qualifying corporations and LLCs. It allows the entity to be taxed as a pass-through (no entity-level tax) while maintaining the corporate structure. The catch: S-Corps have strict eligibility requirements.

• 100 shareholders maximum
• One class of stock
• US citizens or resident aliens only as shareholders (no non-resident aliens, no most trusts)
• No corporate or partnership shareholders (with limited exceptions)
• All shareholders must be individuals, estates, or certain qualifying trusts

S-Corp compensation requirement. S-Corp shareholders who work in the business must receive "reasonable compensation" as W-2 wages before taking distributions. The IRS scrutinizes this — distributing profits to shareholder-employees without paying payroll taxes is a common audit issue. The reasonable wage should reflect what you would pay an unrelated employee for the same work.

S-Corp tax savings. When structured properly, S-Corps save self-employment tax (15.3 percent) on the portion of profit distributed to shareholders. For profitable small businesses, this can save thousands to tens of thousands of dollars per year.

When to choose an S-Corp. S-Corps are best for profitable small businesses with a single owner or a small group of US-resident owners who do not plan to raise outside capital. The payroll compliance cost is justified by the tax savings once profit exceeds a threshold (typically $40,000–$60,000 in distributions to active owners).

The decision matrix

A simplified way to think about the choice:

• Very low revenue, no liability risk, testing an idea: Sole proprietorship, transition to an LLC once profitable.
• Small business, 1–4 US-resident owners, profitable, no outside investment: LLC taxed as S-Corp.
• Small business, non-US-resident owners or >4 owners: LLC taxed as partnership or C-Corp.
• Venture-backed or planning to raise institutional capital: Delaware C-Corp.
• Real estate or passive investment: LLC (often multiple, layered for liability protection).
• Professional practice (law, medicine, accounting): PLLC or LLP in most states.

Common mistakes

Forming in the wrong state. Delaware is the default for C-Corps because of its well-developed corporate law. But forming an LLC in Delaware when your business operates in California (or any other state) just means paying Delaware's franchise tax plus California's franchise tax — without any benefit. Most small businesses should form in the state where they primarily operate.

Treating the LLC like a sole proprietorship. Commingling funds, skipping the operating agreement, and not maintaining separate records expose you to veil piercing. A separate bank account and basic formalities cost almost nothing and preserve your liability shield.

Choosing an S-Corp to avoid self-employment tax without understanding the costs. The "reasonable compensation" requirement, payroll compliance, and stricter recordkeeping all have real costs. The tax savings only exceed the compliance costs when profits are substantial.

Failing to update the structure as the business grows. The entity that made sense when you had one client may not make sense when you have fifty. A periodic review with a business attorney and CPA is worthwhile every few years and at major inflection points (first outside investor, first employee, first $1M in revenue, expansion to a new state).

What to do this week

If you are forming a new business, talk to both a business attorney and a CPA before filing paperwork. The conversation costs a few hundred dollars and saves years of headaches. If you already have a business and have not reviewed your entity choice recently, schedule a checkup. Most business attorneys will do a one-hour review for a few hundred dollars and give you concrete recommendations.

For most situations, the right answer is "form an LLC in your home state, elect S-Corp taxation when you are profitable." But the right answer depends on your specific facts, and getting it wrong is expensive to fix later.