LLC vs. S-Corp vs. C-Corp: Tax Treatment, Liability, and Business Structure

The Structure Decision Follows You for Years

The IRS processed over 25 million pass-through entity returns in 2022 — LLCs, partnerships, and S-corporations combined. The structure a business owner chooses affects not just taxes but liability exposure, fundraising capacity, administrative burden, and the eventual cost of exit. A software developer earning $120,000 in freelance income will pay roughly $9,000 more per year in self-employment taxes operating as a sole proprietor than as an S-corporation — a gap that compounds over a decade into six figures.

The right structure depends on income level, growth trajectory, and exit intent.

Default Tax Treatment by Entity Type

LLCs are state-law entities with no separate federal tax classification — they borrow a tax identity (disregarded, partnership, or corporation) through elections. This flexibility is the LLC's primary structural advantage.

Self-Employment Tax Impact

SE tax is the most immediately quantifiable difference between structures at moderate income levels. An owner netting $150,000 per year:

• Sole proprietor / single-member LLC: SE tax of approximately $21,215 (net $150,000 × 0.9235 × 15.3%)
• S-corporation (50% salary / 50% distribution): FICA on $75,000 salary = $11,475; zero payroll tax on $75,000 distribution. Total: $11,475
• C-corporation (salary equal to net profit): $150,000 salary generates $22,950 in combined FICA (employer + employee share). But the corporation pays 21% flat tax; personal dividend tax creates double taxation.

The S-corp structure saves approximately $9,740 annually over sole proprietor status at $150,000 income — but only after accounting for payroll processing costs, state filing fees, and accountant fees typically ranging from $2,000 to $4,000 annually.

QBI Deduction Eligibility

The Section 199A QBI deduction (up to 20% of qualified business income) applies differently by entity type:

• Sole proprietors and single-member LLCs: Fully eligible for QBI on net Schedule C income. No W-2 wages available to satisfy the wage limitation above income thresholds.
• S-corporation shareholders: Eligible for QBI on their allocable share of S-corp income. W-2 salary paid to the shareholder counts toward the wage limitation.
• C-corporation shareholders: Not eligible. The QBI deduction is unavailable to C-corps and their shareholders — dividends are not qualified business income.
• Partnership members: Generally eligible on their distributive share. Guaranteed payments (analogous to salary) are excluded from QBI.

Double Taxation: The C-Corp Cost

C-corporations pay the 21% federal corporate income tax on profits. Distributing those profits as dividends to shareholders triggers a second tax at the qualified dividend rate — 0%, 15%, or 20% depending on the shareholder's income. Combined, a C-corp earning $100,000 before tax:

• Corporate tax: $21,000 (21%)
• After-tax profit available for dividend: $79,000
• Shareholder dividend tax at 15%: $11,850
• Total tax burden: $32,850 — effective rate of 32.85%

S-corporations and LLCs avoid this second layer entirely. However, C-corps regain competitiveness in specific scenarios: retained earnings reinvested into growth (avoiding dividend distribution), employee benefits (deductible at the corporate level), qualified small business stock (Section 1202 exclusion of up to 100% of capital gains on QSBS), and venture capital fundraising (VCs typically require C-corp structure for preferred stock mechanics).

Asset Protection Comparison

All three entity types provide liability protection — the owner's personal assets are shielded from business debts and lawsuits when corporate formalities are maintained. Key distinctions:

• LLC: Simplest to maintain formalities; many states do not require annual meetings or formal minutes. Charging order protection (in most states) prevents creditors from seizing membership interests.
• S-corporation: Requires more formality — board meetings, shareholder meetings, minutes, bylaws. Failure to maintain formalities risks "piercing the corporate veil."
• C-corporation: Strongest fundraising and exit structure. Delaware C-corps dominate venture-backed companies due to well-established corporate law and predictable court outcomes.

This article is for informational purposes only and does not constitute financial or tax advice.