How to Form S-Corp in California

Quick Answer

To form an S-Corp in California, you must first incorporate as a regular corporation with the California Secretary of State for a $100 filing fee, then elect S-Corp tax status with the IRS using Form 2553. As of April 10, 2026, California corporations face an $800 minimum annual franchise tax regardless of revenue, plus potential corporate income tax at 8.84% on profits.

Step-by-Step Formation Process

1. Choose and Reserve Your Corporate Name

   • Search name availability on the California Secretary of State website
   • Your name must include “Corporation,” “Corp.,” “Incorporated,” or “Inc.”
   • Consider reserving your name for 60 days if not filing immediately

2. Appoint a Registered Agent

   • Designate someone with a California address to receive legal documents
   • Can be yourself, an employee, or a professional registered agent service

3. File Articles of Incorporation

   • Submit Form SI-200 (Articles of Incorporation) to the California Secretary of State
   • Include required information: corporate name, registered agent, share structure
   • Pay the $100 state filing fee
   • File online at bizfile.sos.ca.gov or by mail

4. Obtain Federal EIN

   • Apply for an Employer Identification Number through the IRS website
   • Required for tax filings and business banking

5. File Form 2553 for S-Corp Election

   • Submit IRS Form 2553 within 75 days of incorporation
   • All shareholders must sign the election form
   • This converts your tax status from C-Corp to S-Corp

6. File California S-Corp Election

   • Submit Form 3560 to the California Franchise Tax Board
   • Must be filed by the 15th day of the third month of the tax year

7. Create Corporate Bylaws

   • Draft internal operating rules for your corporation
   • Not filed with the state but required for proper corporate governance

8. Issue Stock Certificates

   • Document ownership by issuing stock certificates to shareholders
   • Maintain proper stock records

Costs Breakdown

Fee Type	Amount	Payable To
Articles of Incorporation	$100	California Secretary of State
Name Reservation (optional)	$10	California Secretary of State
Registered Agent Service (annual)	$100-$300	Third-party service provider
EIN Application	Free	IRS (online application)
Annual Franchise Tax (minimum)	$800	California Franchise Tax Board

Fees current as of April 10, 2026. Contact the Secretary of State for the most current fee schedule.

Requirements Checklist

Before filing your S-Corp formation documents, ensure you have:

• Chosen an available corporate name that complies with California naming requirements
• Identified a registered agent with a California address
• Determined your initial share structure and authorized shares
• Prepared to obtain a federal EIN immediately after incorporation
• All intended shareholders ready to sign Form 2553 for S-Corp election
• California address for the corporation’s principal office
• Initial directors identified (minimum one required)

Tax Implications

California S-Corps face a unique tax structure that differs from federal treatment:

Federal Level:

• S-Corps are pass-through entities for federal tax purposes
• Profits and losses flow through to shareholders’ personal tax returns
• No federal corporate income tax on S-Corp profits

California State Level:

• California imposes an $800 minimum franchise tax annually, regardless of income or activity
• S-Corps with gross receipts over $250,000 pay additional fees ranging from $900 to $11,790
• California corporate income tax rate of 8.84% applies to S-Corp profits
• Unlike federal treatment, California taxes S-Corps as separate entities

Employment Taxes:

• S-Corp shareholder-employees must receive reasonable compensation
• Wages subject to payroll taxes, but distributions above wages are not
• Potential self-employment tax savings compared to sole proprietorships or partnerships

Ongoing Obligations

Annual Requirements:

• File California Form 100S (S-Corp tax return) by March 15th
• Pay $800 minimum franchise tax by 15th day of 4th month of tax year
• File Statement of Information (Form SI-550) biennially with $25 fee

Federal Requirements:

• File Form 1120S (federal S-Corp return) by March 15th
• Provide Schedule K-1 to each shareholder
• Maintain S-Corp election compliance (100 shareholders max, one class of stock, etc.)

Corporate Governance:

• Hold annual shareholder meetings
• Maintain corporate minutes and resolutions
• Keep accurate stock transfer records
• Update registered agent information as needed

Registered Agent

California law requires all corporations to maintain a registered agent with a California address. The registered agent receives:

• Service of process and legal documents
• Official correspondence from the Secretary of State
• Tax notices and compliance documents

Options for Registered Agent Service:

• Yourself (if you have a California address)
• An employee or officer of the corporation
• Professional registered agent service ($100-$300 annually)
• Attorney or accountant

Professional services provide privacy, ensure availability during business hours, and handle document forwarding reliably.

Common Mistakes to Avoid

1. Missing the S-Corp Election Deadline

   • Form 2553 must be filed within 75 days of incorporation
   • Late elections require IRS approval and may be denied

2. Forgetting California’s Separate S-Corp Election

   • Federal S-Corp election doesn’t automatically apply to California
   • File Form 3560 with California Franchise Tax Board

3. Underestimating California’s Tax Burden

   • $800 minimum franchise tax applies even with zero revenue
   • Additional fees based on gross receipts can be substantial

4. Inadequate Shareholder Compensation

   • IRS requires reasonable compensation for shareholder-employees
   • Understating wages to avoid payroll taxes can trigger audits

5. Poor Corporate Record Keeping

   • Maintain proper minutes, resolutions, and stock records
   • Failure to observe corporate formalities can pierce the corporate veil

6. Exceeding S-Corp Limitations

   • Maximum 100 shareholders
   • Only one class of stock permitted
   • All shareholders must be U.S. citizens or residents

7. Ignoring Biennial Statement of Information

   • Required every two years with $25 fee
   • Failure to file can result in suspension of corporate powers

Related Guides

• How to Form S-Corp in Florida 2026: Complete Step-by-Step Guide
• How to Form S-Corp in New Jersey: 2026 Step-by-Step Guide
• How to Form S-Corp in New York: 2026 Step-by-Step Guide
• How to Form S-Corp in Rhode Island: 2026 Step-by-Step Guide
• How to Form C-Corp in California: 2026 Step-by-Step Guide

Frequently Asked Questions

What’s the difference between forming an S-Corp and a regular corporation in California?

The formation process is identical - you file the same Articles of Incorporation with the $100 fee. The difference comes after incorporation when you elect S-Corp tax status with both the IRS (Form 2553) and California (Form 3560). This changes how your corporation is taxed but doesn’t affect the initial formation requirements or fees.

How long does it take to form an S-Corp in California?

The incorporation process typically takes 3-5 business days when filed online with the California Secretary of State. However, your S-Corp election with the IRS can take 8-12 weeks to process. You can begin operating as an S-Corp immediately after filing Form 2553, even before receiving IRS confirmation.

Can I be my own registered agent for my California S-Corp?

Yes, you can serve as your own registered agent if you have a California address and are available during normal business hours to receive legal documents. However, many business owners choose professional registered agent services for privacy and reliability, especially if they travel frequently or work from home.

What happens if I miss the S-Corp election deadline?

If you miss the 75-day deadline to file Form 2553, you can request late election relief from the IRS, but approval isn’t guaranteed. You’ll need to demonstrate reasonable cause for the delay. It’s crucial to file both federal and California S-Corp elections promptly after incorporation.

Do I need an operating agreement for my California S-Corp?

S-Corps don’t have operating agreements like LLCs - they use corporate bylaws instead. While bylaws aren’t filed with the state, they’re essential for establishing internal operating procedures, shareholder rights, and corporate governance rules. Proper bylaws help maintain corporate formalities and protect limited liability.

How much will I pay in California taxes as an S-Corp?

At minimum, you’ll pay $800 annually in franchise tax regardless of income. If your gross receipts exceed $250,000, additional fees range from $900 to $11,790. California also imposes corporate income tax at 8.84% on S-Corp profits, unlike the federal pass-through treatment. Individual shareholders report their share of profits on personal returns subject to California’s 1-13.3% income tax rates.

Can I convert my existing LLC to an S-Corp in California?

You cannot directly convert an LLC to an S-Corp. You would need to dissolve the LLC and form a new corporation, or potentially structure it as an LLC electing corporate tax treatment. This process has significant tax implications, so consult with a tax professional before proceeding.

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This article provides general information for educational purposes only and should not be considered legal or tax advice. Business formation requirements and tax implications vary by situation. Consult with an attorney or accountant for advice specific to your circumstances.