What is the main difference between S-Corp and C-Corp?

The main difference is taxation. S-Corps are pass-through entities — profits are taxed once on owners' personal returns. C-Corps face double taxation — profits taxed at the corporate level (21%) and again as dividends when distributed to shareholders.

Can I switch from C-Corp to S-Corp?

Yes, by filing Form 2553 with the IRS. However, there may be a built-in gains tax on appreciated assets for 5 years after conversion. You must also meet S-Corp eligibility requirements (100 or fewer shareholders, one class of stock, no foreign owners).

Which is better for a small business, S-Corp or C-Corp?

S-Corp is usually better for small businesses because profits avoid double taxation. C-Corp is better if you plan to raise venture capital, retain significant earnings in the business, or have more than 100 shareholders.

S-Corp vs. C-Corp: Tax Treatment, Ownership, & Which to Choose (2026)

S-Corp and C-Corp are both corporation tax classifications, but they’re taxed very differently. The choice comes down to double taxation vs. ownership restrictions.

Quick answer: S-Corps avoid double taxation (profits taxed once, on your personal return) but have ownership restrictions (100 shareholders max, one stock class, no foreign owners). C-Corps face double taxation but have no ownership restrictions and are required for venture capital. Most small businesses prefer S-Corp; funded startups need C-Corp.

S-Corp vs. C-Corp: Side-by-Side

Feature	S-Corp	C-Corp
Taxation	Pass-through (single tax)	Double taxation
Federal corporate tax rate	N/A (individual rates)	21% flat
Dividend tax	N/A (distributions already taxed)	0-23.8% on distributions
Maximum shareholders	100	Unlimited
Shareholder types	U.S. individuals, some trusts/estates	Anyone (individuals, entities, foreign)
Stock classes	One class only	Multiple classes (common, preferred)
Self-employment tax on distributions	No	N/A (salary subject to payroll tax)
Retained earnings tax advantage	No (taxed to owners regardless)	Yes (21% rate vs. personal rates)
VC/institutional investment	Very rare	Standard
IPO eligible	Must convert to C-Corp	Yes
QSBS exclusion	No	Yes ($10M+ tax-free gains)
Employee stock options (ISOs)	Yes (limited)	Yes (standard)

Tax Comparison: $200,000 Net Profit

S-Corp Taxation

Item	Amount
Net business profit	$200,000
Reasonable salary (W-2)	$85,000
Payroll taxes on salary	$12,750 (both halves)
Distribution (not payroll taxed)	$115,000
Income tax on $200,000 (combined)	~$42,000-$55,000 (varies by total income)
Total tax burden	~$55,000-$68,000

C-Corp Taxation (Fully Distributed)

Item	Amount
Net business profit	$200,000
Corporate tax (21%)	$42,000
After-tax profit	$158,000
Owner salary	$85,000 (deducted before profit)
Dividend tax on $158,000 (23.8%)	$37,604
Payroll taxes on salary	$12,750
Total tax burden	~$92,354

C-Corp Taxation (Retaining All Earnings)

Item	Amount
Net business profit	$200,000
Corporate tax (21%)	$42,000
Owner salary	$85,000 (deducted before profit)
Payroll taxes on salary	$12,750
Dividend tax	$0 (no distribution)
Total tax burden	~$54,750

Key insight: C-Corps are tax-efficient when retaining earnings. They’re tax-inefficient when distributing profits.

S-Corp Eligibility Restrictions

Restriction	Details
Maximum shareholders	100 (family members can count as one)
Shareholder types	U.S. citizens/residents, certain trusts, estates
Foreign owners	Not allowed
Entity owners	No corporations or partnerships as shareholders
Stock classes	Only one class of stock (voting rights can vary)
Tax year	Must use calendar year (exceptions exist)
Certain businesses excluded	Banks, insurance companies, DISCs

When to Choose S-Corp

Situation	Why S-Corp Works
Small business, 1-100 owners	Avoids double taxation
Profitable business distributing earnings	Single-level tax on all profit
Service business (consulting, professional)	Pass-through + SE tax savings on distributions
All U.S. owners	Meets eligibility requirement
No plans for VC funding	No investor stock class needs
Steady, distributable income	Maximizes single-tax benefit
Owner wants to minimize total tax	Pass-through typically lower total burden

When to Choose C-Corp

Situation	Why C-Corp Works
Raising venture capital	VCs require preferred stock (multiple classes)
Planning IPO or acquisition	Standard corporate structure required
Retaining significant profits	21% rate vs. 37% top personal rate
Foreign investors or owners	S-Corp doesn’t allow foreign shareholders
More than 100 investors	S-Corp limit is 100
QSBS tax strategy	$10M+ potential tax-free gains on sale
Employee stock option plans	ISOs standard in C-Corps
Reinvesting heavily for growth	Low corporate tax rate on retained earnings

Compliance Comparison

Requirement	S-Corp	C-Corp
Tax return	Form 1120-S	Form 1120
K-1s to shareholders	Yes	No (1099-DIV for dividends)
Reasonable salary requirement	Yes (for shareholder-employees)	Yes (for employees)
Board of directors	Required	Required
Board meetings	Required (annual)	Required (annual)
Meeting minutes	Required	Required
Stock ledger	Required	Required
Annual state filings	Required	Required
Estimated tax payments	Quarterly (personal)	Quarterly (corporate)

Converting Between S-Corp and C-Corp

C-Corp to S-Corp

Step	Details
File Form 2553	Must be filed by March 15 for current year
Meet all S-Corp requirements	100 shareholders max, one stock class, etc.
Built-in gains tax	5-year recognition period on appreciated assets
Accumulated E&P	May trigger tax on distributions

S-Corp to C-Corp

Step	Details
Revoke S-election	File statement with IRS
Effective date	Can choose prospective date
5-year waiting period	Cannot re-elect S-Corp for 5 years
Common reason	Preparing for VC funding or IPO

Bottom Line

S-Corp is better for most small businesses — it avoids double taxation and saves on self-employment tax for owner-distributions. C-Corp is better for funded startups — required for venture capital, enables QSBS tax-free gains, and is tax-efficient when retaining all earnings at the 21% corporate rate. If you’re unsure, start with an LLC (S-Corp election) — you can always convert to a C-Corp later if you raise institutional funding.