LLC vs S-Corp vs C-Corp:
When Each Wins (2026)
The "S-Corp vs C-Corp vs LLC" framing is misleading because S-Corp is not an entity type, it is a tax election. An LLC or a corporation can elect S-Corp status. This page sorts the terminology and runs the actual scenarios where each wins.
Quick Distinctions
- LLC: state-law entity type. Federal tax classification defaults to disregarded entity (single-member) or partnership (multi-member). Can elect corporate treatment via Form 8832 and S-Corp via Form 2553.
- Corporation: state-law entity type. Federal tax classification defaults to C-Corp (Subchapter C). Can elect S-Corp treatment via Form 2553 if eligibility requirements are met.
- S-Corp: federal tax classification under Subchapter S. Available to both LLCs and corporations that meet shareholder count, type, and stock-class restrictions. Pass-through taxation with the salary-distribution split.
- C-Corp: federal tax classification under Subchapter C. The default for corporations. Two-tier taxation: corporate tax at 21% then dividend tax on distributions.
The S-Corp Election: Same Entity, Different Tax
S-Corp is a federal tax classification under Subchapter S of the Internal Revenue Code (sections 1361 through 1379). It is not a state-law entity type and you do not file articles of "S-Corp" with a Secretary of State. To get S-Corp tax treatment you form an LLC or corporation at state level and then file IRS Form 2553 to elect S-Corp classification for federal tax purposes. As of 2025, an eligible single-member LLC can file Form 2553 directly without first filing Form 8832 (the IRS treats the 2553 as both the corporate-classification election and the S-election).
S-Corp eligibility requirements (IRC 1361): no more than 100 shareholders, all shareholders must be US citizens or residents (with limited exceptions for certain trusts and estates), only one class of stock, no partnership or corporate shareholders (with limited exceptions). For one-person LLCs the eligibility is trivially met. For startups planning to take outside investment, the one-class-of-stock requirement is the typical disqualifier: VC preferred stock with liquidation preferences and conversion is a second class.
The S-Corp tax mechanics: the entity does not pay federal income tax. Profits and losses flow through to shareholders pro-rata. Critically, the shareholder-employee's compensation is split into W-2 wages (subject to FICA, the corporate equivalent of SE tax at the same 15.3% combined rate) and distributions (not subject to FICA or SE tax). The reasonable-salary requirement (the IRS will challenge nominal salaries and restate them to defensible market rates) is the main planning constraint. Distributions above the reasonable salary save the 15.3% on the distribution portion. This is the source of the S-Corp SE tax savings.
C-Corp: Double Taxation and Its Offsets
C-Corp federal tax treatment (Subchapter C) means the corporation itself pays federal income tax on its profits at the corporate rate (currently a flat 21% per TCJA-era rules, unchanged through 2026). When profits are distributed to shareholders as dividends, the shareholders pay tax again on the dividends at qualified dividend rates (0%, 15%, or 20% depending on income, plus the 3.8% NIIT for high-income taxpayers). This is the "double taxation" of C-Corp income.
The double-tax effect varies by what the corporation does with its earnings. If profits are retained for reinvestment (typical for growth-stage startups), the second tax never fires. If profits are paid as salaries to founder-employees (deductible at the corporate level), they show up as W-2 wages on the personal return, not dividends, avoiding the double tax (though paying full FICA). If profits are distributed as dividends to shareholders, the full double tax fires.
For a founder-employee of a profitable C-Corp the effective rate often runs around the same as for pass-through structures if the corporation is paying out most of its profit as deductible compensation. The double-tax differential bites hardest when the corporation accumulates profits and then distributes them as dividends, or when shareholders sell the company in a stock sale (where the corporation's built-in gains are not subject to corporate-level recognition but the shareholder pays capital gains on the proceeds). The QSBS exclusion under IRC Section 1202 can offset this on sale, which is the typical reason VC-backed founders accept C-Corp structure.
QSBS Section 1202: When C-Corp Wins on Exit
IRC Section 1202 (Qualified Small Business Stock) allows non-corporate shareholders of qualifying C-Corp stock to exclude federal capital gains tax on the sale of the stock, up to the greater of $10 million or 10 times the adjusted basis. The eligibility requirements: the stock must be issued by a US-domiciled C-Corp (not an LLC or S-Corp), the corporation must have gross assets of $50 million or less at issuance, the corporation must be an active business in a qualifying sector (broadly: technology, manufacturing, services, but excluding certain professional services and finance), and the stock must be held for more than 5 years.
For a founder of a successful startup that exits in a $10M-$100M acquisition, the QSBS exclusion can save $1M-$2M+ in federal capital gains tax. This is the structural advantage that makes C-Corp materially more attractive than LLC + S-Corp for any company with a reasonable shot at a meaningful exit. The 5-year holding period starts when the QSBS-eligible C-Corp stock is issued, so converting an LLC to a C-Corp later restarts the clock at the conversion date. Founders who think QSBS might apply should form as C-Corp from the start.
The One Big Beautiful Bill Act passed in 2025 modified some QSBS specifics including a graduated exclusion for stock held 3-5 years (50% exclusion at 3 years, 75% at 4 years, 100% at 5 years), and higher cap thresholds. Specific terms continue to evolve through IRS guidance. The core advantage (C-Corp stock held over 5 years can get exclusion on sale, LLC interests cannot) remains.
ISO vs NSO Equity Compensation by Entity
Corporations can issue Incentive Stock Options (ISOs) to employees and Non-Statutory Stock Options (NSOs) to employees and contractors. ISOs receive favourable tax treatment if held to certain holding periods: no ordinary income at exercise (subject to AMT), long-term capital gains on sale. NSOs trigger ordinary income at exercise (the spread between strike price and fair market value) plus capital gains on subsequent sale. Both are standard tools in startup equity compensation.
LLCs cannot issue ISOs because ISOs are statutorily limited to corporate stock. LLCs can issue "phantom equity" or "profits interests" that mimic some properties of stock options. Profits interests under Rev Proc 93-27 and Rev Proc 2001-43 give the holder a share of future appreciation in the LLC's value without an immediate tax hit, conceptually similar to options on stock but mechanically different. The documentation is more bespoke than standard ISO grant templates and the tax treatment for the recipient is more complex.
For companies expecting to grant equity to early employees, advisors, or service providers, C-Corp structure makes the grants meaningfully simpler. Standard ISO and NSO grant templates exist; 409A valuations are well-understood; option exercise mechanics are familiar to most prospective employees. LLC equity grants are workable but require more explanation, more attorney involvement, and more education for grant recipients about the tax implications.
Decision Matrix by Founder Path
One-person service business, $50K-$200K profit, no growth ambition
Recommended: LLC with S-Corp election (Form 2553). Pass-through taxation, SE tax savings via salary-distribution split, full QBI deduction below thresholds.
Multi-member professional services firm (consulting, accounting, law)
Recommended: Multi-member LLC or PLLC (where required by licensing) with S-Corp election if SSTB thresholds work out. Operating agreement is critical for partner relationships.
Real estate investor holding rental properties
Recommended: LLC (one per property or one per portfolio). Default disregarded or partnership treatment; S-Corp election rarely helpful because passive rental income is not SE-tax-subject anyway.
Bootstrapped SaaS or product startup, profitable, plans to stay independent
Recommended: LLC with S-Corp election once profitable. Pass-through is more tax-efficient than C-Corp for retained-earnings-then-distribute scenarios.
Pre-revenue startup targeting institutional VC
Recommended: Delaware C-Corp from day one. Standard for VC-funded structure, sets QSBS 5-year clock at incorporation, simplifies equity compensation, satisfies investor structural requirements.
Founders considering eventual private-market exit ($5M-$50M range)
Recommended: Delaware C-Corp for QSBS eligibility. Even if you bootstrap initially, the QSBS exclusion can save 7 figures on exit.
Holding company for diverse business interests
Recommended: Holding LLC (parent), with operating LLCs underneath. Tax classifications determined per-entity based on the operations. Multi-entity structures warrant tax-counsel review.
Conversion Mechanics
Each conversion direction has different mechanics. LLC to S-Corp: file Form 2553 within 75 days of the LLC's formation or fiscal year start (Rev Proc 2013-30 late relief available). No state-law change needed; the LLC remains an LLC at state level. LLC to C-Corp: file Form 8832 to elect corporate treatment. No state-law change needed. LLC to formal corporation (entity conversion): file state-law conversion documents to convert the LLC into a corporation; mechanics vary by state, may trigger a tax event under specific circumstances.
C-Corp to S-Corp: file Form 2553 for the corporation; eligibility requirements must be met. C-Corp to LLC: state-law conversion or merger; generally a taxable event triggering corporate-level gain recognition under IRC 311(b) on appreciated assets distributed. Going the other direction (LLC to C-Corp) is typically less tax-costly than C-Corp to LLC; once you choose C-Corp, reversing is expensive. This asymmetry is one reason founders should think carefully before going C-Corp without a clear path that justifies it.