Wash. Admin. Code § 296-17-31026
If I have more than one business, can I report them on the same account? The way the businesses are organized will make a difference. Each separate "ownership type" must be classified and reported separately from any other much the same way you must keep each business' financial records separate from any other. Your master application must specify the "ownership type" of your business, such as, sole proprietor, partnership, corporation, etc. If that one ownership type registration is for more than one location of the same business or more than one type of business, you can choose to report all of them on the same account or on separate accounts. However, if you register each as a separate ownership type, you must report them on separate accounts.
Wash. Admin. Code § 296-17-31026
Statutory Authority: RCW 51.16.035. 98-18-042, § 296-17-31026, filed 8/28/98, effective 10/1/98.