How to Form C-Corp in Washington

Quick Answer

Forming a C-Corporation in Washington requires filing Articles of Incorporation with the Washington Secretary of State for a $200 filing fee. As of April 10, 2026, processing typically takes 5-10 business days. Washington offers significant advantages for corporations, including no state income tax, though businesses must pay the state’s Business & Occupation (B&O) tax.

Step-by-Step Formation Process

1. Choose a Corporate Name: Your corporation name must be distinguishable from existing entities registered in Washington. The name must include “Corporation,” “Corp.,” “Incorporated,” or “Inc.” Check name availability through the Washington Secretary of State’s business search tool.

2. Appoint a Registered Agent: Washington law requires every corporation to maintain a registered agent with a physical address in the state. This can be yourself, another individual, or a professional registered agent service.

3. Prepare Articles of Incorporation: Draft your Articles of Incorporation including the corporation name, registered agent information, purpose clause, authorized shares, and incorporator details. Washington doesn’t require a specific state form, but your articles must meet statutory requirements.

4. File Articles of Incorporation: Submit your Articles of Incorporation to the Washington Secretary of State either online through the Corporations Online portal or by mail. Include the $200 filing fee.

5. Obtain an EIN: Apply for an Employer Identification Number (EIN) from the IRS, which you’ll need for tax purposes and opening business bank accounts.

6. Create Corporate Bylaws: Draft bylaws that outline your corporation’s internal operating procedures, though Washington doesn’t require filing these with the state.

7. Hold Initial Board Meeting: Conduct an organizational meeting to adopt bylaws, elect officers, authorize share issuance, and handle other initial corporate business.

8. Issue Stock Certificates: Issue stock certificates to initial shareholders according to your articles and bylaws.

Costs Breakdown

Item	Cost	Notes
Articles of Incorporation Filing Fee	$200	Required state fee as of April 10, 2026
Name Reservation (Optional)	Contact SOS	If you want to reserve your name before filing
Registered Agent Service	$100-300/year	If using professional service
EIN Application	Free	Apply directly with IRS
Corporate Kit	$50-150	Optional but recommended
Attorney Fees	$500-2,000	Optional professional assistance

The minimum cost to form a C-Corporation in Washington is $200 if you handle the process yourself and serve as your own registered agent.

Requirements Checklist

Before filing your Articles of Incorporation, ensure you have:

• Unique Corporate Name: Verified availability and includes required corporate designator
• Registered Agent: Individual or entity with Washington address willing to serve
• Articles of Incorporation: Properly drafted with all required information
• Filing Fee: $200 for standard processing
• Initial Directors: At least one director identified (can be the incorporator initially)
• Authorized Shares: Determined number and classes of shares to authorize
• Corporate Purpose: Defined business purpose (can be general)
• Incorporator Information: Name and address of person signing articles

Tax Implications

Washington provides significant tax advantages for C-Corporations:

State Income Tax: Washington imposes no state income tax on corporations, making it highly attractive for businesses compared to high-tax states.

Business & Occupation Tax: Corporations must pay Washington’s B&O tax, which is calculated on gross receipts rather than net income. Rates vary by business classification, typically ranging from 0.13% to 1.5%.

Federal Taxes: C-Corporations face double taxation at the federal level - the corporation pays corporate income tax on profits, and shareholders pay tax on dividends received.

Sales Tax: If your corporation sells taxable goods or services, you’ll need to collect Washington’s base sales tax rate of 6.5%, plus applicable local taxes.

Employment Taxes: If you have employees, you’ll pay federal and state unemployment taxes, Social Security, and Medicare taxes.

Ongoing Obligations

Washington C-Corporations must maintain several ongoing compliance requirements:

Annual Reports: File an annual report with the Washington Secretary of State by the end of your anniversary month each year. The annual report fee is $60 as of April 10, 2026.

Corporate Records: Maintain corporate books and records, including meeting minutes, resolutions, and financial records.

Board Meetings: Hold regular board of directors meetings and annual shareholder meetings as required by your bylaws.

Tax Filings: File federal corporate income tax returns (Form 1120) and Washington B&O tax returns as required.

Registered Agent: Maintain a registered agent with a Washington address at all times.

Business License: Obtain and maintain any required business licenses for your specific industry or location.

Registered Agent

Every Washington corporation must maintain a registered agent - an individual or entity authorized to receive legal documents on behalf of the corporation. The registered agent must have a physical address in Washington (P.O. boxes are not acceptable).

Registered Agent Options:

• Serve as your own registered agent if you have a Washington address
• Appoint another individual with a Washington address
• Hire a professional registered agent service ($100-300 annually)

Registered Agent Responsibilities:

• Receive service of process and legal notices
• Forward important documents to the corporation
• Maintain regular business hours at the registered address
• Notify the Secretary of State of any address changes

Professional registered agent services offer privacy benefits and ensure someone is always available during business hours to receive documents.

Common Mistakes to Avoid

1. Inadequate Name Research: Failing to thoroughly check name availability can result in rejection or future legal issues. Search both the Secretary of State database and federal trademark records.

2. Improper Articles of Incorporation: Missing required information or using incorrect language can delay processing. Ensure your articles meet all Washington statutory requirements.

3. Neglecting Registered Agent Requirements: Failing to maintain a proper registered agent can result in administrative dissolution. Always keep this information current with the state.

4. Mixing Personal and Corporate Assets: Failing to maintain proper corporate formalities can lead to “piercing the corporate veil” and personal liability for business debts.

5. Ignoring Annual Report Deadlines: Late annual reports result in penalties and potential administrative dissolution. Mark your calendar for the anniversary month deadline.

6. Inadequate Record Keeping: Poor corporate records can create problems during audits, legal proceedings, or business transactions. Maintain organized books and records from day one.

7. Overlooking B&O Tax Registration: Failing to register for and pay B&O taxes can result in penalties and interest. Register with the Washington Department of Revenue promptly after formation.

Related Guides

• How to Form C-Corp in Ohio: 2026 Step-by-Step Guide ($99 Fee)
• How to Form Corporation in Washington: 2026 Step-by-Step Guide
• How to Form LLC in Washington: 2026 Step-by-Step Guide
• How to Form C-Corp in Alabama: 2026 Step-by-Step Guide
• How to Form C-Corp in Alaska: 2026 Step-by-Step Guide

FAQ

What’s the difference between forming a C-Corp and an LLC in Washington?

Both entity types have the same $200 formation fee and $60 annual report fee in Washington. The key differences lie in taxation and structure. C-Corporations face double taxation but offer more sophisticated ownership structures and investment options. LLCs provide pass-through taxation and operational flexibility but have limitations on ownership types and investment structures.

How long does it take to form a C-Corporation in Washington?

As of April 10, 2026, standard processing takes 5-10 business days when filing Articles of Incorporation with the Washington Secretary of State. Expedited processing options may be available for additional fees - contact the Secretary of State for current expedited service options and costs.

Can I serve as my own registered agent for my Washington C-Corporation?

Yes, you can serve as your own registered agent if you have a physical address in Washington and are available during regular business hours to receive legal documents. However, many business owners prefer professional registered agent services for privacy and reliability reasons.

Do I need an attorney to form a C-Corporation in Washington?

While not legally required, consulting an attorney is recommended for C-Corporation formation due to the complexity of corporate structures, tax implications, and ongoing compliance requirements. An attorney can ensure proper formation and help establish appropriate corporate governance procedures.

What happens if I don’t file my annual report on time?

Late annual reports in Washington result in penalties and potential administrative dissolution of your corporation. If your corporation is administratively dissolved, you’ll need to file for reinstatement, which involves additional fees and paperwork. Always file annual reports by the end of your anniversary month.

Can a non-U.S. citizen form a C-Corporation in Washington?

Yes, non-U.S. citizens can form and own C-Corporations in Washington. There are no citizenship or residency requirements for incorporators, directors, or shareholders. However, you’ll still need a registered agent with a Washington address and must comply with all federal tax and reporting requirements.

How many directors does a Washington C-Corporation need?

Washington law requires at least one director for a corporation. The initial director(s) can be named in the Articles of Incorporation or elected at the organizational meeting. Directors must be natural persons (not entities) but don’t need to be Washington residents or U.S. citizens.

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Disclaimer: This information is provided for educational purposes only and should not be considered legal or tax advice. Business formation requirements and fees change periodically. Consult with a qualified attorney or accountant for advice specific to your situation and verify current requirements with the Washington Secretary of State.