How to Form S-Corp in Washington

Quick Answer

To form an S-Corporation in Washington state, you must first incorporate as a regular C-Corporation by filing Articles of Incorporation with the Washington Secretary of State for a $200 fee. Processing typically takes 5-10 business days. After incorporation, you’ll elect S-Corporation tax status by filing Form 2553 with the IRS within 2 months and 15 days of incorporation.

Step-by-Step Formation Process

1. Choose a Corporate Name: Select a unique name that includes “Corporation,” “Incorporated,” “Company,” or an abbreviation like “Corp.,” “Inc.,” or “Co.” Search the Washington Secretary of State’s business name database to ensure availability.

2. Appoint a Registered Agent: Designate a registered agent with a Washington state address who will receive legal documents on behalf of your corporation. This can be yourself, another individual, or a professional registered agent service.

3. File Articles of Incorporation: Submit Articles of Incorporation to the Washington Secretary of State either online through the Corporations Online portal or by mail. Include your corporate name, registered agent information, number of authorized shares, and incorporator details.

4. Pay the Filing Fee: As of April 2026, the filing fee is $200. This can be paid online via credit card or by check if filing by mail.

5. Obtain an EIN: Apply for an Employer Identification Number (EIN) from the IRS using Form SS-4 or the online application. This is required for tax purposes and opening business bank accounts.

6. Elect S-Corporation Status: File Form 2553 (Election by a Small Business Corporation) with the IRS within 2 months and 15 days of incorporation. All shareholders must sign this form to consent to the S-Corp election.

7. Create Corporate Bylaws: Draft bylaws that outline how your corporation will operate, including meeting procedures, officer roles, and shareholder rights.

8. Issue Stock Certificates: Issue stock certificates to initial shareholders and maintain a stock ledger documenting all share transactions.

Costs Breakdown

Fee Type	Amount	Payable To
Articles of Incorporation Filing Fee	$200	Washington Secretary of State
Registered Agent (if using service)	$100-$300/year	Service Provider
EIN Application	Free	IRS
Form 2553 Filing	Free	IRS
Name Reservation (optional)	Contact SOS	Washington Secretary of State

Fees current as of April 2026. Contact the Washington Secretary of State for the most up-to-date fee schedule.

Requirements Checklist

Before filing your Articles of Incorporation, ensure you have:

• ✅ Unique Corporate Name: Verified availability through Washington’s business name search
• ✅ Registered Agent: Individual or service with Washington state address
• ✅ Incorporator Information: Name and address of person filing the documents
• ✅ Share Structure: Number of authorized shares (common practice is 1,500 shares)
• ✅ Filing Fee: $200 payment ready for submission
• ✅ S-Corp Eligibility: Maximum 100 shareholders, all must be U.S. citizens or residents
• ✅ Corporate Bylaws: Internal governance document (not filed with state)

Tax Implications

Washington state offers significant tax advantages for S-Corporations:

State Income Tax: Washington has no state income tax, meaning S-Corp profits passed through to shareholders are not subject to state-level income taxation.

Business & Occupation (B&O) Tax: S-Corporations are subject to 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 Tax Treatment: As an S-Corporation, your business is a pass-through entity for federal tax purposes. Profits and losses flow through to shareholders’ personal tax returns, avoiding double taxation.

Self-Employment Tax Savings: S-Corp shareholders who work in the business must pay themselves a reasonable salary subject to payroll taxes. Remaining profits distributed as dividends are not subject to self-employment tax, potentially providing significant savings compared to sole proprietorships or partnerships.

Sales Tax: If your business sells taxable goods or services, you’ll need to register for a Washington state sales tax permit. The base sales tax rate is 6.5%, with additional local taxes varying by location.

Ongoing Obligations

Washington S-Corporations must fulfill several ongoing compliance requirements:

Annual Reports: File an Annual Report with the Washington Secretary of State by the last day of the month in which your corporation was incorporated. The filing fee is $60 as of April 2026.

Federal Tax Filings: File Form 1120S (U.S. Income Tax Return for an S Corporation) annually by March 15th, or the 15th day of the third month after your tax year ends.

Payroll Tax Obligations: If you have employees (including shareholder-employees), file quarterly payroll tax returns and make required deposits for federal and state employment taxes.

Corporate Formalities: Hold annual shareholder meetings, maintain corporate minutes, update bylaws as needed, and keep accurate financial records.

Business License Renewals: Renew any required business licenses and permits according to their respective schedules.

Registered Agent

Washington law requires every corporation to maintain a registered agent with a physical address in the state. The registered agent serves as the official point of contact for receiving legal documents, tax notices, and other important correspondence.

Registered Agent Options:

• Yourself: You can serve as your own registered agent if you have a Washington address and are available during business hours
• Another Individual: A friend, family member, or business associate with a Washington address
• Professional Service: A registered agent service company that specializes in this function

Registered Agent Responsibilities:

• Maintain a physical Washington address (not a P.O. Box)
• Be available during normal business hours to receive documents
• Forward all received documents to the appropriate company representatives
• Notify the corporation of any address changes

Using a professional registered agent service costs approximately $100-$300 annually but provides privacy protection and ensures reliable document receipt.

Common Mistakes to Avoid

1. Missing the S-Corp Election Deadline: Failing to file Form 2553 within 2 months and 15 days of incorporation results in default C-Corporation tax treatment for the entire first year.

2. Inadequate Shareholder Salary: The IRS requires S-Corp shareholder-employees to receive reasonable compensation. Paying yourself too little salary to minimize payroll taxes can trigger audits and penalties.

3. Mixing Personal and Business Finances: Failing to maintain separate bank accounts and proper bookkeeping can jeopardize your corporate liability protection.

4. Ignoring Corporate Formalities: Not holding required meetings, maintaining minutes, or following bylaws can result in “piercing the corporate veil” and personal liability exposure.

5. Violating S-Corp Ownership Rules: Exceeding 100 shareholders, issuing multiple share classes, or allowing non-U.S. persons to own shares automatically terminates S-Corp status.

6. Late Annual Report Filing: Missing Washington’s annual report deadline results in late fees and potential administrative dissolution of your corporation.

7. Improper Stock Documentation: Failing to issue stock certificates or maintain accurate stock records can create ownership disputes and tax complications.

Related Guides

• How to Form S-Corp in Arizona: Complete 2026 Guide
• How to Form S-Corp in Montana: Complete 2026 Guide
• How to Form S-Corp in Pennsylvania: 2026 Complete Guide
• How to Form S-Corp in Wyoming: Complete 2026 Guide
• How to Form S-Corp in Hawaii: 2026 Complete Guide & Steps

FAQ

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

The Washington Secretary of State processes Articles of Incorporation in 5-10 business days for standard filings. Expedited processing may be available for an additional fee. After incorporation, you have 2 months and 15 days to file Form 2553 with the IRS to elect S-Corporation tax status.

Can I form an S-Corp without a lawyer?

Yes, you can form an S-Corporation in Washington without an attorney. The Articles of Incorporation form is straightforward, and the Secretary of State provides instructions. However, consulting with a business attorney is advisable for complex situations or if you’re unfamiliar with corporate formalities and ongoing compliance requirements.

What’s the difference between an LLC and S-Corp in Washington?

Both LLCs and S-Corporations in Washington have a $200 formation fee and $60 annual report fee. The main differences are tax treatment and formalities. S-Corps can provide self-employment tax savings but require more formal record-keeping, regular meetings, and payroll processing. LLCs offer more operational flexibility with simpler tax reporting.

Do I need a Washington address to form an S-Corp?

You need a registered agent with a Washington address, but the corporation’s principal office can be located anywhere. Shareholders and directors don’t need to be Washington residents. However, having a local presence may be beneficial for business operations and banking relationships.

Can a single person own an S-Corp in Washington?

Yes, Washington allows single-shareholder S-Corporations. You can be the sole shareholder, director, and officer. However, you must still follow corporate formalities like holding annual meetings (even if you’re the only attendee) and maintaining proper corporate records.

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

If you miss the 2 months and 15 days deadline to file Form 2553, your corporation will be taxed as a C-Corporation for its first year. You can file for S-Corp status the following year, but you’ll miss out on the pass-through tax benefits for the initial tax year. In some cases, the IRS may accept late elections with reasonable cause.

How much does it cost to maintain an S-Corp in Washington annually?

The minimum annual cost includes Washington’s $60 annual report fee. Additional costs may include registered agent fees ($100-$300 if using a service), tax preparation ($500-$2,000+), and business license renewals. If you have employees, add payroll processing costs and quarterly tax filings.

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

You cannot directly convert an LLC to a corporation in Washington. You would need to form a new corporation and transfer the LLC’s assets, which may have tax implications. Alternatively, an LLC can elect to be taxed as an S-Corporation by filing Form 2553 while maintaining its LLC legal structure.

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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 can be complex and vary based on individual circumstances. Consult with a qualified attorney or accountant for advice specific to your situation.