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The Workers’ Compensation Insurance Rating Bureau of California has released its September 1, 2021 Experience Modification Estimator for insurers, agents and brokers to help policyholders understand how payroll and claims experience will affect the computation of their September 1, 2021 and later experience modification (X-Mod).

To use the WCIRB September 1, 2021 Experience Modification Estimator, free of charge, click on the following link: September 1, 2021 Experience Modification Estimator.

By entering policyholder-specific payroll, classification and claims information into the Estimator, users can obtain an estimated X-Mod using approved September 1, 2021 California Workers’ Compensation Experience Rating Plan -1995 values (including expected loss rates, D-Ratios and primary thresholds that vary by employer size).

The Estimator’s spreadsheet format makes it easy for users to view and simply copy and paste data into the application and then view, print or save detailed estimated X-Mod information based on that data.

The September 1, 2021 Estimator was updated with the approved experience rating values after the Insurance Commissioner issued a Decision on the WCIRB’s September 1, 2021 Regulatory Filing and is available in the Learning Center of

The Estimator is for informational purposes only, and results are approximations based on the information entered. The Estimator does not produce WCIRB-published X-Mods. For more information and helpful tips on how to use the Estimator, go to the WCIRB Experience Modification Estimators page.