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

The legal structure you choose for your business affects every financial decision you make: how you're taxed, how much personal liability you face, who can invest in your company, and how easily you can sell or pass it on. The wrong structure can cost tens of thousands in unnecessary taxes, scare off investors, or create legal exposure that wipes out your personal assets.

The three most common structures for U.S. businesses—Limited Liability Company (LLC), S-corporation, and C-corporation—each have distinct advantages. This guide walks through how each works, when each makes sense, and how to choose the right one for your business.

The three structures at a glance

LLC: the flexible default

The Limited Liability Company is the most popular business structure for small businesses, and for good reason. It offers liability protection, flexible management, and pass-through taxation with minimal paperwork. An LLC can have one owner (single-member) or many (multi-member), and can be managed by the members or by appointed managers.

How LLCs are taxed

By default, a single-member LLC is taxed as a sole proprietorship—the business income appears on Schedule C of the owner's personal tax return. A multi-member LLC is taxed as a partnership, filing Form 1065 and issuing K-1s.

The owner pays self-employment tax (15.3%) on the full net profit, plus income tax at personal rates. For businesses with significant profit (above roughly $60,000), this SE tax burden becomes substantial.

The S-corp election twist

Here's the powerful part: an LLC can elect to be taxed as an S-corp by filing Form 2553 with the IRS. The business remains an LLC legally but is taxed under S-corp rules. This combines the simplicity of an LLC with the SE tax savings of an S-corp—often the best of both worlds.

Many LLCs start as default sole proprietors, then elect S-corp taxation once profits justify the additional payroll administration costs (typically $1,200–$2,500/year for payroll service + tax prep).

When an LLC makes sense

• Small businesses with modest profits where SE tax savings wouldn't justify S-corp election
• Real estate holding companies—LLCs are the standard structure for owning rental properties
• Businesses with multiple owners who want flexible profit-sharing arrangements
• Family businesses wanting simpler governance than corporate bylaws
• Businesses that may want S-corp taxation later—easy to convert

S-corp: the tax-efficient workhorse

An S-corporation is a tax election, not a separate business entity. You form either an LLC or a C-corp at the state level, then elect S-corp tax status with the IRS using Form 2553. The election must be made within 2 months and 15 days of the beginning of the tax year. Once elected, the business is taxed as a pass-through entity but with one major advantage over default LLC taxation: distributions aren't subject to self-employment tax.

The salary-vs-distribution strategy

S-corp owners who work in the business must take a "reasonable salary" subject to FICA payroll taxes (15.3%, split between employer and employee portions). Profits beyond the salary can be taken as distributions, which are not subject to payroll tax.

Example: An S-corp earns $200,000 in net profit. The owner takes a $100,000 reasonable salary and $100,000 in distributions. Payroll tax is owed only on the $100,000 salary—$15,300. As a default LLC, the owner would owe 15.3% SE tax on the entire $200,000—$30,600. Annual savings: $15,300, minus ~$1,500 in payroll service and additional tax prep costs.

The IRS aggressively audits S-corps with unreasonably low salaries. "Reasonable" depends on industry, role, hours worked, and comparable market compensation. A software engineer owner paying themselves $30,000/year while the business earns $500,000 is audit bait. Industry salary surveys, formal compensation studies, and CPA guidance help establish defensible numbers.

Ownership restrictions

S-corps face strict ownership rules:

• Maximum 100 shareholders
• Only U.S. citizens or residents can be shareholders
• Only individuals, estates, and certain trusts can own shares (no other corporations or partnerships)
• Only one class of stock (no preferred vs. common split)

These restrictions make S-corps unsuitable for businesses seeking venture capital, private equity, or foreign investors. They work well for owner-operated businesses with a small group of U.S. individual owners.

When S-corp status makes sense

• Profitable service businesses where owner profit exceeds reasonable salary by $30K+
• Established small businesses with stable profits and U.S.-only individual owners
• Professional practices—law, accounting, consulting, medicine
• Businesses not planning to raise outside capital in the foreseeable future

C-corp: the choice for growth and outside capital

A C-corporation is a separate taxable entity. It files its own tax return (Form 1120), pays corporate income tax at a flat 21% federal rate, and distributes after-tax profits as dividends to shareholders. Those dividends are taxed again on shareholders' personal returns at qualified dividend rates (0%, 15%, or 20%). This "double taxation" makes C-corps inefficient for distributing profits to owners—but ideal for reinvesting profits and raising institutional capital.

Why VCs require C-corps

Venture capitalists and institutional investors almost universally require portfolio companies to be C-corps for several reasons:

• Preferred stock—C-corps can issue multiple classes of stock with different rights (preferred vs. common), required by VC deal structures
• QSBS tax benefits—Qualified Small Business Stock under Section 1202 can exclude up to $10M or 10x basis of capital gains on sale of C-corp stock held 5+ years
• Entity-level taxation—VCs (often tax-exempt entities like pension funds) can't receive pass-through income; C-corp profits stay at the entity level
• Stock options—C-corps issue options cleanly; S-corps and LLCs have complications with non-employee option holders
• Clean cap table—corporate governance is well-understood and standardized

If you plan to raise venture capital, form a Delaware C-corp from day one. Converting from LLC to C-corp later is possible but creates tax complications and legal expense.

When a C-corp makes sense

• Venture-backed startups planning to raise institutional capital
• Businesses planning an IPO—public companies are C-corps
• Businesses reinvesting all profits—no double taxation if no dividends are paid
• Companies seeking QSBS exclusion on future sale
• Businesses with international owners—S-corps prohibit foreign shareholders

Tax comparison: a worked example

Consider three identical service businesses, each earning $300,000 in net profit, owned by a single founder in the 24% federal income tax bracket (married filing jointly, $400K total income). All three are structured differently:

The S-corp saves $23,000 per year vs. default LLC taxation. The C-corp pays the lowest total tax—but the cash stays trapped in the corporation. If the owner needs to extract cash for living expenses, the C-corp becomes far more expensive due to double taxation on dividends.

For most owner-operated service businesses, the S-corp election is the sweet spot: maximum tax efficiency with maximum cash access.

Conversion options

You're not locked into your initial choice. Common conversions:

• LLC → S-corp taxation: File Form 2553. Simple, no legal entity change.
• LLC → C-corp: Statutory conversion or entity merger. Creates taxable event in some cases.
• S-corp → C-corp: File Form 8832 to revoke S-election. May trigger built-in gains tax for 5 years.
• C-corp → LLC/S-corp: Difficult; taxable event on appreciated assets.

Conversion tax consequences can be significant. Always model with a CPA before converting, especially when appreciated assets are involved.

State-level considerations

Beyond federal tax, state rules vary:

• Franchise taxes—Delaware charges LLCs $300/year flat; C-corps pay based on shares authorized (often $400+ for startups). California charges LLCs $800/year minimum plus gross-receipts fee; C-corps pay 8.84% of net income.
• State income tax—Some states (Texas, Nevada, Washington) have no state income tax but high franchise/gross receipts taxes.
• Foreign qualification—If you incorporate in Delaware but operate in California, you must foreign-qualify in California and pay CA fees.
• S-corp state taxes—Some states (NYC, Illinois) tax S-corps at the entity level. New York City doesn't recognize S-corp status.

For most small businesses operating in one state, incorporating in your home state is simplest. For startups raising capital, Delaware is the standard.

Industry-specific recommendations

Beyond the general frameworks, certain industries have dominant structures that fit their business models, tax situations, and investor expectations:

• Real estate holding companies: LLCs are the universal standard. They offer liability protection, pass-through taxation, and flexible profit-sharing for multi-owner properties. Many investors use one LLC per property to isolate liability. Series LLCs in states like Delaware and Texas allow multiple sub-LLCs under one parent for cost efficiency.
• Professional services (law, medicine, accounting): Many states require professional corporations (PC) or professional LLCs (PLLC). Some professionals elect S-corp taxation for the SE tax savings once income exceeds ~$80K. Personal liability for professional malpractice isn't eliminated by entity structure—malpractice insurance is essential.
• Software and technology startups: Delaware C-corp from day one if venture capital is on the roadmap. The QSBS exclusion, preferred stock flexibility, and clean cap table make C-corps the only structure VCs will fund.
• E-commerce and retail: LLCs taxed as S-corps once profits exceed ~$60K. Sales tax nexus complexity doesn't depend on entity type, so optimize for tax efficiency.
• Restaurants and bars: LLCs or S-corps to allow pass-through of losses during startup phase. Multiple locations sometimes use a holding LLC with separate subsidiary LLCs per location.
• Construction and trades: LLCs with S-corp election, paired with strong insurance. Personal liability for construction defects can pierce entity protection if formalities aren't maintained.
• Family-owned businesses: LLCs for flexibility and easy transfer of ownership interests to next generation. Family LLCs also provide estate planning benefits including valuation discounts.

When in doubt, start simple. A single-member LLC taxed as a sole proprietor costs $100–$500 to form and meets 90% of small business needs. You can elect S-corp status later by filing one form, or convert to a C-corp when raising capital. The cost of starting simple is far lower than the cost of unwinding a complex structure built for a business model that didn't pan out.

Common mistakes to avoid

• Defaulting to LLC without modeling S-corp savings. Many profitable LLCs pay $10K–$30K/year in unnecessary SE tax. Run the math annually; elect S-corp when savings exceed payroll service costs.
• Setting S-corp salary too low. The IRS audits this aggressively. Use industry salary surveys and document your reasoning.
• Forming a C-corp before raising capital. If you don't have VC interest, C-corp status costs more in taxes and complexity. Stay LLC until you're fund-raising.
• Ignoring state franchise taxes. California's $800 LLC fee surprises many new businesses. Research state costs before incorporating.
• Failing to maintain corporate formalities. C-corps and S-corps require annual meetings, minutes, and resolutions. Skipping these can pierce the corporate veil in lawsuits.
• Co-mingling personal and business funds. Regardless of entity, separate accounts and clean bookkeeping are required to preserve liability protection.
• Not reviewing structure as the business evolves. A structure that fit at $100K revenue may not fit at $1M. Revisit annually with a CPA.

Frequently asked questions

Can an LLC be taxed as an S-corp?

Yes. File IRS Form 2553 to elect S-corp tax status for your LLC. The business remains an LLC legally (governed by state LLC law and your operating agreement) but is taxed as an S-corp. This is the most popular structure for profitable service businesses.

What's the difference between an LLC and a sole proprietorship?

A sole proprietorship has no legal separation between the owner and business—the owner is personally liable for business debts. An LLC creates a legal entity that shields the owner's personal assets from business liabilities. Both are pass-through for taxes by default; the LLC just adds liability protection and credibility.

Can I switch from C-corp to S-corp later?

Yes, by filing Form 2553. But built-in gains tax applies for 5 years after conversion: any appreciation in assets at the time of conversion is taxed at corporate rates if sold within 5 years. Plan conversions carefully.

Do I need a lawyer to incorporate?

For simple LLC formations, services like LegalZoom, Stripe Atlas, or your state's online filing portal are sufficient. For multi-owner businesses, complex equity arrangements, or C-corp formation with founder vesting, hire a startup attorney. The cost ($1,500–$5,000) is worth avoiding mistakes in your operating agreement or charter.

Should I incorporate in Delaware?

For startups raising venture capital, yes—VCs require Delaware C-corps. For small businesses operating in one state, incorporate in your home state to avoid foreign qualification fees and registered agent costs in Delaware. Use our Business Valuation Calculator and other tools to model how structure affects your long-term finances.