Retro forms and publications



    Resources for electronic report users

    For use with downloadable data files and electronic reports:

    Retro premium calculator

    • Current Retro Premium Calculator, updated November 2021; this 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 the schedule of Retro reports, can be found in our annual Retro dates and deadlines calendar (updated November 2021).

      Retrospective rating newsletter

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

      Contact Retrospective Rating

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