LLC or C-corp: which structure saves California startups on taxes
California startups must weigh self-employment taxes, franchise fees, and the flat requirement from venture investors to choose the right business structure.
California startups face a fundamental choice in how to organize for tax purposes. The decision between a limited liability company and a C-corporation affects how much their owners pay in taxes, what paperwork they file annually, and most critically—whether they can raise venture capital. Each structure carries distinct tax consequences that can compound significantly over a company's life.
The choice depends partly on how the business will be funded and whether growth through investor capital is planned. For bootstrapped founders, an LLC offers simplicity and potential tax savings. For founders seeking venture investment, a C-corporation becomes mandatory, despite its tax drawbacks. Understanding the mathematics behind each structure helps founders make an informed choice about which path suits their business.
How pass-through taxation works for LLCs
LLCs are treated by default as "pass-through entities" for federal income tax purposes. This means the LLC itself does not pay corporate income tax. Instead, the owner reports the business's profits or losses on their personal tax return—typically on Schedule C for single-member LLCs, or through partnership tax filings for multi-member entities. The business's income is simply passed through to the owner's personal return and taxed at individual rates.
The advantage is simplicity and avoiding double taxation. But there is a significant cost: owners of pass-through LLCs must pay self-employment tax on their share of the business's profits. Self-employment tax combines Social Security tax (12.4% on earnings up to $160,200 annually, as of 2023) and Medicare tax (2.9% on all earnings, plus an additional 0.9% tax on earnings above $200,000 for single filers), totaling 15.3% for most business owners. Only 92.35% of self-employment income counts toward this tax, and owners can deduct half the tax as a business expense, but the rate remains substantial.
For a single-member LLC that nets $100,000 per year, the owner would owe roughly $15,300 in self-employment tax alone, on top of income tax at their individual rate. The burden is heavier than employee taxation because the owner pays both the employee portion (which would be 7.65% for Social Security and Medicare combined) and what would normally be the employer portion, which employers typically pay on their employees' behalf.
LLC owners can elect to change the tax treatment. By filing Form 8832 with the IRS, an LLC can elect to be taxed as a C-corporation. Alternatively, an LLC can elect S-corporation tax treatment, which provides a different path to self-employment tax savings. An S-corporation is a pass-through entity where income passes to shareholders' personal returns, avoiding the corporate-level tax. However, S-corporation shareholders must pay themselves reasonable salaries on which they owe FICA taxes (employee share of 7.65%, matched by employer), and only the remaining profits can be taken as distributions free of self-employment tax. This election requires filing Form 2553 with the IRS and can significantly reduce the total tax burden.
C-corporations and double taxation
C-corporations are taxed as separate legal entities. The corporation pays the federal corporate income tax rate—a flat 21% under the Tax Cuts and Jobs Act of 2017. If the company earns $100,000 in profit, it owes $21,000 in federal corporate tax, leaving $79,000.
When the corporation distributes profits as dividends to shareholders, those shareholders pay income tax on the dividends at their individual rates, which can range from 10% to 37% depending on income. This creates the classic "double taxation" problem: profits are taxed once at the corporate level and again at the shareholder level. On a $79,000 distribution to a shareholder in the 24% federal bracket, the shareholder would owe an additional $18,960 in tax, reducing the after-tax proceeds to roughly $60,040. The combined tax burden—$21,000 at the corporate level plus $18,960 at the individual level—equals 39,960 of the original $100,000 profit.
However, C-corporations have one critical advantage for avoiding self-employment tax: owners are treated as employees. If an owner takes a reasonable salary as an employee, they pay standard income tax plus FICA taxes (the employee portion of 7.65% for Social Security and Medicare, which the corporation matches with another 7.65% employer contribution). The corporation deducts these salary and payroll costs as a business expense, reducing taxable corporate income. The remaining profits can be retained in the corporation or distributed as dividends, avoiding self-employment tax on retained earnings.
For profitable companies that retain earnings rather than distributing them immediately, this structure can produce significant tax savings compared to LLC pass-through treatment. A C-corporation that earns $100,000 and retains all of it pays $21,000 in corporate tax but avoids the 15.3% self-employment tax, saving the owner $15,300 that would be owed in an LLC structure. The double taxation only matters when profits actually leave the company as dividends.
Understanding FICA versus self-employment tax
The difference between FICA taxes and self-employment tax is critical to understanding the cost of each structure. FICA—the Federal Insurance Contributions Act—is a payroll tax split between employees and employers. Employees pay 7.65% (6.2% for Social Security up to a wage base of $160,200 in 2023, and 1.45% for Medicare with no limit), and employers match that 7.65%. The employer contribution is deductible as a business expense.
Self-employment tax, by contrast, is paid entirely by the individual. At 15.3%, it covers both the employee and employer portions of Social Security and Medicare that salaried employees would split with their employers. This tax applies to 92.35% of net self-employment income rather than 100%.
In a C-corporation, the owner takes a salary and pays the 7.65% employee portion of FICA, while the corporation pays and deducts the matching 7.65% employer portion. In an LLC structured as a pass-through, the owner pays 15.3% self-employment tax on profits. That difference of 7.65% on every dollar of profit is substantial. On $200,000 in business income, it equals $15,300—enough to matter significantly in a startup budget.
“For any startup planning to raise venture capital, the C-corporation structure is effectively mandatory, regardless of the tax costs.”
Why venture investors require C-corporation structure
Venture capital investors almost universally require portfolio companies to be organized as C-corporations, not LLCs or other structures. The requirement is structural, not tax-related. C-corporations can have unlimited numbers of shareholders without restriction on investor residency or investor type. This allows multiple venture rounds, employee stock option plans, and diverse investor bases.
An LLC, particularly one taxed as a partnership, becomes administratively complex when multiple investors join. Each investor needs a capital account, and distributions become complicated. More critically, many institutional investors and venture funds have legal or policy restrictions against investing in pass-through entities. A limited partnership that invests in an LLC pass-through must allocate the LLC's pass-through income to its own limited partners, creating a tax reporting cascade that most institutional investors avoid.
The C-corporation structure also supports employee equity compensation through stock options. Employee stock options grant employees the right to purchase company shares at a predetermined exercise price, typically set at the stock's fair value on the grant date. These options vest over time, with vesting schedules that may include cliff vesting (where all shares vest at once after a period) or graded vesting (where shares vest gradually), meaning an employee must work during the vesting period before receiving vested shares. Startups use option pools as equity compensation to attract and retain talent without immediately paying cash. C-corporations can issue multiple classes of stock and create standard option pools that employees understand and venture investors expect. An LLC cannot as easily implement this infrastructure.
The C-corporation structure creates a clean cap table—the record of who owns what percentage of the company—that can accommodate many investors and multiple funding rounds without messy restructuring. For any startup planning to raise venture capital, the C-corporation structure is effectively mandatory, regardless of the tax costs.
The calculation: when each structure makes sense
For a bootstrapped founder taking profits from the business immediately, an LLC's pass-through structure may cost less in total taxes depending on the circumstances. If the owner pays out most income as distributions and is in a lower individual tax bracket than the 21% corporate rate, the self-employment tax is steep, but avoiding corporate tax on distributed profits can offset it. The math depends entirely on the owner's individual tax bracket and profit distribution plans.
For a profitable company retaining earnings or reinvesting profits for growth, the C-corporation structure typically offers better outcomes. The 21% corporate rate may be lower than the owner's individual tax rate, and the company keeps earnings without triggering self-employment tax. The double taxation of dividends only matters when profits actually leave the company. A C-corporation that retains $500,000 in annual earnings pays $105,000 in federal tax but avoids self-employment taxes. An LLC owner with the same profits would owe 15.3% self-employment tax on the $500,000—$76,500—plus income taxes, likely totaling more than the C-corporation burden.
For founders seeking venture capital, the choice is not optional: C-corporation structure is required by investors. The tax cost of potential double taxation must be weighed against the ability to raise investment capital, access employee equity compensation, and scale the company. In practice, founders planning to take venture investment structure as C-corporations from inception, even though the immediate tax cost is higher. The venture capital requirement overrides tax considerations.
Related coverage: The tax math behind LLC vs. S-Corp for California startups; How California's LLC franchise tax works, and why it surprises people; What startup employees need to understand about equity compensation.
