How to Establish a Sole Proprietorship in Washington

To establish a sole proprietorship in Washington, here's everything you need to know.

In Washington, you can establish a sole proprietorship without filing any legal documents with the Washington state government. There are four simple steps you should take:

  1. Choose a business name.
  2. File a trade name.
  3. Obtain licenses, permits, and zoning clearance.
  4. Obtain an Employer Identification Number.


1. Choose a Business Name


2. File a Trade Name

If you use a business name that is different from your legal name, Washington requires you to register a trade name with the Washington State Business Licensing Service. This is a mandatory requirement in Washington. To file your trade name you must fill out a Business License Application from the Business Licensing Service. The filing fee is $5 per name.

3. Obtain Licenses, Permits, and Zoning Clearance

Your business may need to obtain business licenses or professional licenses depending on its business activities. Washington provides a comprehensive website of every profession and occupation that requires a license by any sole proprietorship. A business can obtain this information by going to the Washington Business Licensing Service. You will need to file a Business License Application with the State of Washington before you can open for business. In addition, local regulations, including business licenses, building permits, and zoning clearances, may apply to your business. You will need to check with your city and county governments for more information.

4. Obtain an Employer Identification Number



In Washington, businesses are required to report taxes and file various employee reports. You may need to use your EIN when registering your business to report taxes through the Washington Department of Revenue. If you have employees, you must report and pay employment taxes on a periodic basis. More information related to employment taxes can be obtained by registering with the Washington Business License Application.

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