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Glossary of WCB Terms

Workers' Compensation Coverage


Understanding Workers' Compensation Insurance

Experience Modification Factor

The Compensation Insurance Rating Board (CIRB) develops experience modification factors for employers who have workers compensation annual premiums of $5,000 or more. An experience modification factor adjusts an employer's premium to reflect the difference between the employer's loss experience and the average experience that is expected for its classification(s) and size. The Experience Rating Plan places an emphasis on the number (frequency) of claims and (to a lesser extent) the severity of workplace accidents. If an employer has better experience than is expected for an average employer in the same industry with the similar payroll, the employer receives a premium credit. On the other hand, if the employer's experience is worse than the comparable average, the employer receives a premium debit. The ability of the employer to directly affect his/her premium in this manner serves as an incentive to control or eliminate workplace injuries.