Resources for electronic report users

For use with downloadable data files:

Retro forms and publications



Retro premium calculator

  • Current Retro Premium Calculator, updated December 2020; applies to coverage periods beginning July 1, 2017, and later. This calculator assists in projecting future retro performance (though projections are not guaranteed). Please email us with any questions about the calculator.
  • Retro Premium Calculator, updated July 2017. This premium calculator is meant to be used only for coverage periods from July 2014 through April 2017. Unlike the current premium calculator above, this calculator does not reflect subsequent changes to the Retro insurance tables and single loss limit program rules.
  • Prior Retro Premium Calculator, updated November 2014. This premium calculator is meant to be used for coverage periods prior to July 2014 only. Unlike the updated Retro Premium Calculator (above), this calculator still uses the Performance Adjustment Factor (PAF) in the net insurance charge under premium-based plans.

Retro program rules

The rules governing Retrospective Rating can be found in the Washington Administrative Code (WAC):

Calendar of dates and deadlines affecting Retro participants

Significant dates and deadlines, as well as a schedule of report publications for 2021 can be found in our Retro 2021 dates and deadlines calendar. Last updated December 2020.

Retrospective rating mailing list

Sign up to receive our email bulletins. Subscribers to the L&I Retro News mailing list will typically receive 6–8 messages a month, with news and updates about issues affecting Retro participants.

Contact Retrospective Rating

You can reach Retro Program staff by email (, or by calling 360-902-4851 (Fax: 360-902-4258).