LLC vs S-Corp vs C-Corp: When Each Makes Sense

The three entity types in plain language

LLC (Limited Liability Company)

The default choice for most small businesses. Provides personal liability protection (your personal assets generally aren't at risk for business debts and lawsuits) with operational simplicity. Profits and losses pass through to owners' personal tax returns by default. Most flexible structure of the three.

Default taxation: Single-member LLC is taxed as sole proprietor (Schedule C on personal return). Multi-member LLC is taxed as partnership (Form 1065 plus K-1s to members). All profits subject to self-employment tax (15.3% Social Security + Medicare).

S-Corporation (S-Corp)

Not an entity type per se but a tax election. You form an LLC (or rarely, a C-Corp) and elect S-Corp tax status with the IRS (Form 2553). The election can save self-employment tax for businesses with significant profit by splitting income into "reasonable salary" (subject to payroll tax) and "distribution" (not subject to self-employment tax).

Eligibility: Maximum 100 shareholders, all must be US persons (citizens or residents), only one class of stock, no corporate or partnership shareholders. Most small businesses qualify; some structures don't.

C-Corporation (C-Corp)

Traditional corporate structure. Separate tax entity that pays its own taxes; dividends to shareholders taxed again on personal returns (the "double taxation"). More complex compliance but offers multiple stock classes, unlimited shareholders, and the structure venture capital firms require.

Best for: Businesses planning to raise venture capital, businesses with international shareholders, businesses planning to go public, and businesses where the structure enables specific tax strategies (qualified small business stock under Section 1202, etc.).

The most important variable: profit level

Tax-optimal entity selection depends heavily on how much profit your business generates relative to the work you do.

Profit below $50K/year

LLC default taxation is usually correct. S-Corp election saves self-employment tax but adds payroll compliance costs ($1,000-$2,500/year) that often exceed the savings at this profit level. Forming a C-Corp adds complexity without benefit unless you have specific reasons (outside investment, complex stock structures).

Profit $50K-$100K/year

Gray zone. S-Corp election may save money depending on your state, your reasonable salary requirements, and the specific compliance costs you face. Run actual numbers (or have your CPA do so) before electing.

Profit $100K-$500K/year

S-Corp election typically saves substantial tax — often $5,000-$15,000+ annually depending on the salary/distribution split. The compliance costs become small relative to the savings. Most consultants, professional service businesses, and small operating businesses in this range benefit from S-Corp election.

Profit above $500K/year

S-Corp election still beneficial but other considerations enter: qualified business income deduction (QBI) interaction, state-level taxation differences, retirement contribution strategies, multi-state nexus. Tax planning becomes more individual.

Pre-revenue / VC-backed startups

C-Corp typically required regardless of revenue. VCs prefer (often require) Delaware C-Corps for stock-class flexibility, qualified small business stock benefits, and the legal infrastructure they're familiar with. The tax inefficiency of C-Corp is offset by the funding access.

The "reasonable salary" requirement for S-Corps

The key constraint on S-Corp tax savings: the IRS requires S-Corp owners who provide services to pay themselves "reasonable compensation" as W-2 salary before taking distributions. Setting salary too low to maximize tax savings is a major audit trigger.

"Reasonable" means what someone in your role and industry would earn from an arms-length employer doing the same work. Factors:

• Industry salary surveys for your role
• Geographic location
• Years of experience
• Time devoted to the business (full-time vs part-time)
• Other comparable factors

For most professional service businesses, "reasonable salary" tends to fall in the range of 40-60% of net business income, depending on industry and other factors. Below 40% gets risky from an audit perspective; above 60% reduces the tax benefit substantially.

Beyond taxes: liability and asset protection

All three entity types provide liability protection by default — your personal assets generally are not at risk for business debts and lawsuits. However:

The corporate veil

Protection only works if you maintain the entity as separate from yourself. "Piercing the corporate veil" — when courts allow personal liability despite the entity — happens when:

• Owner mixes personal and business finances
• Owner doesn't maintain required formalities (annual meetings, separate records)
• Entity is undercapitalized for its activities
• Owner personally guarantees business debts
• Fraud or other misconduct

Single-member LLCs face heightened veil-piercing risk because they're easy to treat as the owner's alter ego. Maintain separation rigorously.

Personal guarantees

Banks, landlords, and some vendors often require personal guarantees from small business owners. These bypass entity protection for those specific obligations. Limit personal guarantees where possible.

Professional liability

Some professions (accounting, law, medicine, engineering) require additional liability structures beyond LLC protection. Some states require "Professional LLCs" (PLLCs) or "Professional Corporations" (PCs) with additional rules. Industry-specific.

Practical decision framework

Choose LLC (default taxation) if:

• Small business, sole proprietor or family business
• Profit below $50K-$75K annually
• Simple ownership structure
• No plans for outside investment

Choose LLC with S-Corp election if:

• Profit consistently above $75K-$100K
• Owner provides significant services to the business
• Stable ownership structure (1-10 owners)
• Can support the additional payroll/tax compliance complexity

Choose C-Corp if:

• Raising venture capital or planning to
• Multiple stock classes needed
• International or institutional shareholders
• Planning IPO eventually
• Qualified Small Business Stock (QSBS) strategy

Use the BizFormPro entity comparison calculator to see illustrative tax implications for your situation. Verify with a CPA before electing.