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Experience Modifier (Ex Mod)

What is an Experience Modifier (Ex Mod)?

Experience Modifier (Ex Mod) is a numerical factor used by insurance carriers to adjust a company's Workers' Compensation premium based on its historical loss experience compared to other businesses in the same industry. The definition of an Ex Mod is rooted in a "baseline" of 1.0; a meaning of a 1.0 score is that the business is performing exactly at the industry average. If the score may refer to a number below 1.0 (a "credit" mod), the company is safer than average and pays less; if it is above 1.0 (a "debit" mod), they are viewed as higher risk and face premium surcharges.

Experience Modifier (Ex Mod) in More Detail

The Experience Modifier (Ex Mod) serves as the ultimate “risk barometer” for any business with a workforce, and for franchisors, it is a critical metric to monitor across the network. The meaning of the Ex Mod is to provide an objective, data-driven way for underwriters to reward or penalize a company based on its actual safety record. It is calculated by looking at a “rolling window” of three years of claims history (typically excluding the most recent year) and comparing those actual losses to the expected losses for companies with similar payrolls in the same class codes.

In a technical definition, the Ex Mod acts as a multiplier. For example, a business with a 1.25 Ex Mod will pay 25% more in premiums than a competitor with a 1.0 mod. This factor may refer to the financial health of a franchise system’s operations; a high Ex Mod among franchisees often signals poor safety training or inadequate “return-to-work” programs.

For the franchisor, understanding the Ex Mod is vital because while they may not be the direct employer, a high “debit” mod at the franchisee level can lead to financial instability, higher turnover, and increased exposure to vicarious liability claims. Managing the Ex Mod isn’t just about insurance math—it’s about enforcing a culture of safety that protects the brand’s bottom line and its people.

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