Register trade names

You must register a trade name, or “doing business as” name, per RCW 19.80.10 for:

  • A Sole Proprietor or Partnership using a name other than the full legal name of the owner or owners.
  • A Corporation, Limited Partnership, or Limited Liability Company operating under a name other than the name registered with the Office of the Secretary of State.
  • Any business name you are using that is not your full legal name.

Registering your trade name does not protect the name from use by others. A business can register an unlimited number of trade names.

A trade name will remain registered indefinitely until the owner requests that it be canceled. There is no charge for canceling a trade name.

If you also want to file a trademark or service mark, you may want to consult an attorney. If your business activities will extend beyond Washington State, it may be to your benefit to file for a trademark with the U.S. Patent and Trademark Office. If your business activities will stay within Washington, it may be to your benefit to file for a trademark with the Secretary of State.

Find out if a name is already in use

Register a trade name

  • File a Business License Application online with My DOR.
  • Pay the $5 fee for each trade name registered and the Business License Application processing fee (non-refundable), see instructions on how to determine your processing fee.​

Cancel a trade name

See also the Trade Name Registration- Business Bulletin

How to apply


Add a state endorsement to your business
Add a city license to your business
Apply for a new business license

Online assistance
Setting up your business licensing and tax account
How to add a city license endorsement

By mail

Complete the following and mail to:

Business Licensing Service
P.O. Box 9034
Olympia, WA 98507-9034

Business License Application