What Is a Ubi Number?

by Vera Leigh ; Updated September 26, 2017

The Unified Business Identifier number, or UBI, is a nine-digit number used by the state of Washington to identify businesses there to local agencies.


Businesses in Washington state use a Unified Business Identifier number for "filing, taxes and identification" with state agencies, according the Washington Secretary of State website.


Washington state's Corporations Division assigns a UBI number to a business when an owner files for one of the following classifications: corporation, limited liability company, limited partnership or other business. Check the Corporations Division page on the Washington Secretary of State website to see all classifications.

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If a business does not fall into one of the Corporations Division's categories, it can still receive a UBI number. The business owner will need to fill out a "Master Business Application" from the Washington State Department of Licensing.


Don't get confused between a UBI number and a Federal Employer Identification Number (FEIN). The Internal Revenue Service assigns the latter number to a business in order to classify its federal tax account, according to the Washington Secretary of State website.


In 2008, "Forbes" magazine rated Washington state as the third best state for business.

About the Author

Vera Leigh has worked as a professional freelance writer since 2008. Her work has appeared in "Learn Overseas" and "Grad Source" magazines. In addition, she received an honorable mention in "Newsweek's" My Turn contest. She has written features for nonprofits focused on literacy, education, genomics and health. In her spare time, Leigh puts her English major to use by tutoring in grammar and composition.

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