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Current Self-Insurance Assessment Rates

Assessments based on claim costs
Administrative Assessment (WAC 296-15-223 (
Administrative Assessment Notice (1388 KB PDF)
Fiscal year Base Adjusted
2019 0.0541 0.0585
Second Injury Assessment (WAC 296-15-225 (
Secondary Injury Assessment Notice (660 KB PDF)
Fiscal year Base Adjusted
2019 0.1050 0.1050
Insolvency Trust Assessment (WAC 296-15-227 (
Insolvency Trust Assessment Notice (194 KB PDF)
Quarterly Average
2019 0.0000

Assessments based on worker hours
Supplemental Pension & Asbestos (WAC 296-15-229 (
Can withhold half from employees
Assessment Rate Notice (234 KB PDF)
Calendar year Assessment
2019 0.1122
Overpayment reimbursement
Can withhold entirely from employees
Calendar year Assessment
2019 0.0001


  • Base applies to self-insured employers certified after July 1, 2017.
  • Adjusted applies to self-insured employers certified before July 1, 2017, whose rate is impacted by any previous over or under collection of that assessment.
  • Time periods:
    • Fiscal year: July 1 through June 30.
    • Calendar year: Jan. 1 through Dec. 31.
    • Quarterly: Assessed each quarter.

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