Business formation paperwork on a desk, How to Start an S Corp in California: Formation and Tax Benefits

How to Start an S Corp in California: Formation and Tax Benefits

Learning how to start an S corp in California means learning two separate processes. The first is forming a corporation with the California Secretary of State. The second is electing S status with the IRS. California then taxes the S corporation under its own rules, so you need to plan for both the federal and state sides. This guide covers the steps in order: formation, the S election, California’s tax, filing dates, ownership rules, and what changes for you as the owner.

An S corporation is not a separate type of legal entity. It is a tax election. A corporation, or an existing LLC, can elect to be taxed as an S corporation so that income and losses pass through to the owners’ personal returns. The election does not change the legal entity. It changes how the IRS and the state tax it.

Important: This is informational content, not legal or tax advice. Your entity choice and tax election depend on your facts. Before you file or elect, talk with a California business attorney and a CPA.

Step 1: Form the California Corporation

An S corporation starts as an ordinary corporation, so the first filing is the Articles of Incorporation (Form ARTS-GS). File it with the California Secretary of State, Business Programs Division, at sos.ca.gov/business-programs. The filing fee is $100. Online filings through bizfile Online are normally processed in 5 days or less. PDF filings take 10 or more days. If you need speed, the Secretary of State offers a 24-hour expedite for $350 and a same-day option for $750, which requires the filing to be received by 9:30 a.m.

The name rules are simpler than the LLC rules. California does not require a corporation name to include “Inc.” or “Corp.” Only a close corporation’s name must include “corporation,” “incorporated” or “limited.” If you want to hold a name before you file, a name reservation costs $10 and lasts 60 days, and it cannot be renewed for consecutive periods. Check availability and reserve the name through the Secretary of State name availability page.

Your articles must name an agent for service of process. The agent must be either an individual who lives in California or a corporation that holds a Corporations Code 1505 certificate. A corporate agent does not list an address.

After filing, you still have to set up the corporation itself. That means adopting bylaws, electing directors, appointing officers, and issuing stock. The Statement of Information (Form SI-550) is due within 90 days of filing the articles, and then every year. The fee is $25. You also need a federal Employer Identification Number (EIN) from the IRS for the S election and for payroll.

Step 2: Make the S Corp Election With the IRS

The S election is made with the IRS, not with California. California has no separate S election form. The Franchise Tax Board states that IRS approval is required for S status, so the California S corp election follows the federal one. To apply for S corp status in CA, you file IRS Form 2553. The deadline is no more than 2 months and 15 days after the beginning of the tax year the election is to take effect, or at any time during the preceding tax year. Use the IRS Form 2553 page for current instructions.

Calendar the deadline the day you form the corporation. Missing it means waiting for the next eligible tax year unless you qualify for relief, and that delay can cost you a year of the planned treatment.

An existing LLC can also elect S status with the IRS, and California then taxes it as an S corporation. If you are choosing between an LLC and a corporation, that decision belongs in your conversation with a CPA and an attorney.

Step 3: Understand the California S Corp Tax

This is where the state side differs from the federal side. Every S corporation with California-source income pays a 1.5% tax on net income. S corporations that are banks or financial institutions pay 3.5%. For comparison, a regular C corporation pays 8.84% (10.84% for banks), so the S rate is far lower. The 1.5% rate applies to net income with no income threshold.

Every S corporation also owes the $800 minimum franchise tax, whether it is active, inactive, or operating at a loss. Two exceptions apply. The minimum is waived for a newly formed or qualified S corporation filing its initial return for its first taxable year. It is also waived for an S corporation that did no business in California in a tax year of 15 days or fewer. Even in those cases, first-year net income is still taxed at 1.5%.

An S corporation does not pay the LLC fee. The optional pass-through entity elective tax is a separate alternative for S corporations, available for tax years 2021 through 2030. It has its own election rules, and whether it helps depends on your overall federal and state tax picture, so ask your CPA whether it fits.

Filing Dates for Form 100S

California Form 100S is the S corporation’s annual state return. It is due the 15th day of the 3rd month after the close of the tax year. For a calendar 2025 return, that deadline is March 16, 2026. You can get an automatic six-month extension to file Form 100S, but the extension does not extend the time to pay. If you owe tax, pay by the original due date.

The $800 minimum has its own payment timing. The Franchise Tax Board states that it is due in the first quarter of each accounting period. Confirm the payment voucher and the exact date with the Franchise Tax Board before you pay.

Ownership Rules

An S corporation must meet ownership limits. The Franchise Tax Board states that an S corporation may have no more than 100 shareholders. Federal rules also limit who can own the shares. Generally, shareholders must be individuals, certain trusts and estates, or certain tax-exempt organizations. Nonresident aliens cannot be shareholders, and the corporation can have only one class of stock. Confirm your ownership structure with a CPA before you issue shares, especially if an investor is a partnership, another corporation, or a foreign person.

What Changes for the Owner

The biggest change is pass-through taxation. The S corporation’s income passes through to the shareholders’ personal returns whether or not the company distributes it. You can owe tax on profit that the corporation keeps in its bank account.

Owners who work in the business are generally employees. Their salary runs through payroll, and you register with the EDD if you have employees. Ask a CPA about reasonable compensation. The IRS expects owner-employees to receive a reasonable salary before taking distributions.

Self-employment tax works differently. An LLC owner taxed as a sole proprietor or partner pays self-employment tax of 15.3% on net earnings. Distributions to an S corporation shareholder are generally not subject to that tax, which is one of the main reasons owners consider the election. That is not a promise of savings. Whether the S election saves money depends on your profit, the salary you pay yourself, and your other income. A CPA can compare your numbers.

Annual Upkeep

  • Form 100S and the $800 minimum franchise tax, on the timing described above.
  • The Statement of Information (Form SI-550) at $25 every year.
  • Payroll filings with the EDD if you have employees, including owner-employees.
  • Federal Form 1120-S, the S corporation’s federal return.
  • Corporate formalities: hold shareholder and director meetings, keep minutes, and store them in the corporation’s records.

Licenses and Local Requirements

California has no general statewide business license. The Secretary of State issues none, and a CDTFA seller’s permit is not a business license. If you sell taxable goods, register with the California Department of Tax and Fee Administration. Most California cities charge a local business tax or registration certificate (445 of 483 cities report revenue from one), and there is no common formula, so check your own city. Counties license only regulated activities. Regulated trades and professions are licensed by state boards. Licensed professions generally use a professional corporation rather than a standard corporation, so confirm the structure with the relevant board.

If you operate under a name other than the corporation’s exact name, file a Fictitious Business Name Statement with the county clerk within 40 days of starting. Publish it in a newspaper once a week for four weeks. It expires after five years.

Resources

Next Steps

File the Articles of Incorporation first, then calendar the Form 2553 deadline. Before you make the election, have a CPA model the 1.5% tax and the $800 minimum against your expected profit and salary. Have an attorney review the corporate paperwork. This guide is informational only and is not legal or tax advice.

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