Key Takeaways

• Both are corporations under California law. The difference is purely a federal tax election: a C corp is the default, an S corp is a corporation that has elected pass-through taxation.
• A C corp is taxed at the entity level, and shareholders are taxed again on dividends. An S corp passes income through to shareholders, avoiding that second layer.
• If you plan to raise venture capital, the C corp is almost always the expected structure. VCs generally cannot invest in an S corp.
• S corps come with strict eligibility rules: a cap on the number of shareholders, only one class of stock, and no nonresident-alien or entity shareholders.
• California taxes both. A C corp pays 8.84% on net income; an S corp pays 1.5%. Both owe the $800 minimum.

C Corp vs. S Corp in California: Which Is Right for Your Startup?

If you have decided to form a corporation rather than an LLC, you still have one more fork in the road: will it be a C corporation or an S corporation? The labels sound like two different entities, but under California law they are the same thing. What separates them is a federal tax election and a set of eligibility rules that quietly decide which option is even available to you.

Here is how to think it through, especially if you are building something you hope to fund and grow.

They start as the same entity

When you incorporate in California, you create a corporation under the General Corporation Law. By default, the IRS taxes that corporation as a C corporation. If the corporation qualifies and files the right election, it becomes an S corporation for tax purposes. Same legal entity, same articles of incorporation, same board and shareholders. The only thing that changes is how the IRS taxes the profits.

So “C corp vs. S corp” is a tax question layered on top of a corporation, much like the S corp election can sit on top of an LLC. The legal shell is identical; the tax treatment is not.

The tax difference: one layer or two

A C corporation pays federal corporate income tax on its profits. When it distributes those profits to shareholders as dividends, the shareholders pay tax again on their personal returns. That is the double taxation the C corp is known for. It stings most for a business that pays out profits to its owners, and far less for a startup that plows every dollar back into growth and pays no dividends at all.

An S corporation avoids the entity-level federal tax. Profits and losses pass through to shareholders, who report them on their personal returns, so the income is taxed once. For a profitable small business whose owners take the earnings home, that single layer is often the more efficient outcome.

On the California side, the state taxes both, just at different rates. As of this writing, a C corporation pays an 8.84% franchise tax on net income, while an S corporation pays 1.5%. Both owe the $800 annual minimum. Newly formed corporations are generally exempt from that minimum in their first taxable year, a break that, notably, no longer applies to newly formed LLCs. Because these rates and rules can change, confirm the current figures with a CPA or the Franchise Tax Board before you decide.

Where the C corp pulls ahead: raising money

For a startup planning to raise venture capital, the C corporation is the standard, and usually the only practical choice. There are concrete reasons.

Venture funds and many institutional investors are structured in ways that make owning S corp stock either impossible or deeply unattractive. They also want preferred stock, with liquidation preferences and other special rights, and an S corp is not allowed to have more than one class of stock. The C corp accommodates all of it: multiple share classes, an unlimited number of investors, foreign investors, and entity investors like funds. It is the structure the funding ecosystem is built around.

There is also a tax incentive that draws founders to C corps: qualified small business stock can, under federal rules and if strict conditions are met, allow shareholders to exclude a portion of their gain when they sell. That benefit is tied to C corp stock and is one reason venture-backed startups lean C corp from the start. The rules are detailed, so treat this as a flag to explore with a tax professional, not a guarantee.

The S corp’s eligibility rules

The flip side of the S corp’s tax advantage is a set of restrictions that disqualify many businesses, especially fundable startups:

• Shareholder cap. An S corp may have no more than 100 shareholders.
• Who can own it. Shareholders generally must be U.S. citizens or residents. Nonresident aliens cannot hold S corp stock, and most entities (other than certain trusts and estates) cannot either. That rules out fund investors and many foreign founders.
• One class of stock. An S corp can have only a single class of stock, though differences in voting rights are allowed. This is the rule that collides most directly with venture financing, which depends on preferred shares.

If your cap table will include a venture fund, a foreign co-founder, or preferred stock, the S corp is off the table, and the decision is effectively made for you.

Can you switch later?

Because a C corp and an S corp are the same legal entity with different tax elections, you can sometimes move between them. A C corporation that becomes eligible and wants pass-through treatment can elect S corp status, and an S corporation can revoke its election to become a C corp, which is exactly what some startups do right before a venture round when they need the C corp structure investors require. The catch is that switching is not always clean. Revoking an S election can trigger waiting periods before you can re-elect, and converting from C to S can carry tax consequences on built-in gains. None of this is a reason to agonize over the first choice, but it is a reason to make that choice deliberately and to loop in a tax professional before flipping the election.

For founders, the practical lesson is to look down the road. If a venture raise is plausible within a year or two, starting as a C corp avoids a mid-financing scramble. If outside investment is genuinely not in the plan, the S corp election keeps the tax simpler, and you still retain the option to revoke it later if circumstances change.

So which one for your startup or small business?

The choice tends to sort cleanly along one question: are you raising outside venture money?

If yes, form a C corporation. It is what investors expect, it supports the share classes and ownership they require, and it keeps the qualified-small-business-stock door open. The double-taxation concern is muted for a company reinvesting everything into growth.

If no, and you are running a profitable, closely held business whose owners take the earnings home, the S corp election can be the more tax-efficient path, sparing you the entity-level federal tax. Just confirm you meet the eligibility rules and remember California still wants its 1.5%.

The wrong choice is expensive to unwind under deadline pressure, so it is worth getting right at the start. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

A quick illustration

Two founders building a venture-backed AI company should almost certainly form a C corp; their future investors will require it, and trying to convert mid-raise is a headache. A married couple running a profitable consulting corporation with no outside investors and all-U.S. ownership is a natural fit for an S corp election, taxed once and kept simple. The structures look similar on paper; the right tax election depends entirely on the plan.

For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

Frequently Asked Questions

What are the key differences between a C Corp and an S Corp in California?

Both are corporations under California’s General Corporation Law; the difference is a federal tax election. A C corp is taxed at the entity level with a second tax on dividends, while an S corp passes income through to shareholders to be taxed once. They also differ on California rates (8.84% vs. 1.5%) and on eligibility rules that restrict who can own an S corp.

Which entity is better for raising venture capital in California?

The C corporation. Venture funds generally cannot or will not own S corp stock, and they require preferred shares, which an S corp’s single-class-of-stock rule prohibits. A C corp supports multiple share classes and unlimited, including foreign and entity, investors.

How are C Corps and S Corps taxed differently in California?

As of this writing, a C corporation pays an 8.84% California franchise tax on net income, and an S corporation pays 1.5%. Both owe the $800 annual minimum. Federally, a C corp is taxed at the entity level with dividends taxed again, while an S corp’s income passes through to shareholders.

Can a California S Corp have foreign shareholders?

No. S corp shareholders generally must be U.S. citizens or residents. Nonresident aliens cannot hold S corp stock, which is one of the reasons startups planning foreign ownership or investment choose a C corporation.

What are the shareholder limits for S Corps in California?

An S corporation may have no more than 100 shareholders, who generally must be individuals who are U.S. citizens or residents (with limited exceptions for certain trusts and estates), and it may issue only one class of stock.

This article is for general information and is not legal advice. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.