How Your Ex-Mod Works
The key to calculating Workers’ Compensation premiums is what’s known as the experience modification factor, also known as your ex-mod, for each business. Understanding your company’s ex-mod and the data used to obtain it helps identify ways to control your Workers’ Compensation costs.
Each employer’s performance within the same industry classification is compared, and an experience modification factor is provided, which helps determine the business’s premium. The X-mod formula incorporates several factors, including company size, unexpected large losses, and the frequency and severity of losses.
The ex-mod represents either a credit or debit that is applied to your Workers’ Compensation premium based on how your company performed over a three-year period, excluding the most recent policy period. If you have an ex-mod greater than 1.0, your losses are worse than expected, and a surcharge will be added to your premium. If you have an ex-mod lower than 1.0, your losses were better than expected, resulting in a discounted premium.