Washington State Payroll Tax and Registration Guide

Access information about Washington payroll tax registration here.

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Are you an employer with employees in Washington? Keep reading for details around registering your business.

Account number(s) needed

Companies who pay employees in Washington State must file for a business license in WA and register online. They will then receive a number of ID and account numbers from the WA Department of Labor and Industries and Department of Employment Security.

Washington Employment Security Department Tax IDs

WA Employment Security (ES) Reference Number: 999999-99-9 (9 digits)
Unified Business Identifier (UBI): 999-999-999 (9 digits)
  • To look up an existing UBI number, use this tool.
  • Washington Employment Security Department-FLI Account Information
Worker’s Comp Account ID: 999,999-99 (8 digits)
Participant Activation Code (PAC): 99999999 (8 digits)
Risk Class code: 9999-99 (6 digits)

Required payroll documentation


  • Not applicable


  • Form 5208B (Quarterly Unemployment Insurance Wage Detail): If filed online, you can use a payroll report that contains Name, SSN, Gross Amount Paid, and Number of Hours Worked in a Quarter to balance prior quarters.

Third Party Access /POA Needed:

  • Yes

Local Income Taxes Imposed:  

  • No

State resources

Visit state resources for specific tax rates and wage details:
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