Key Factors Workers' Compensation Premiums Depend On

Premium Drivers in Workers' Compensation

Premiums are calculated from three core elements: payroll, risk class, and claim experience. Payroll is the base, multiplied by a rate that reflects the industry's risk class and the employer's claim history.

Payroll Base

Insurers charge a rate per $100 of paid wages. The higher the payroll, the larger the premium. Employers with extensive wage bills must pay more, regardless of other factors.

Risk Class and Industry Code

Each occupation receives a specific risk class code that represents the typical injury frequency and severity. A construction worker's rate is higher than a data entry clerk's because the former faces more physical hazards.

Claims Experience Modifier

Claims history modifies the base rate. Employers with a higher ratio of claims to payroll earn a higher experience modifier, increasing premiums. Conversely, a clean record can lower costs.

State‑Specific Adjustments

State regulations set minimum rates, caps, and special assessment fees. These adjustments can add or subtract from the calculated premium, varying widely across jurisdictions.

Additional Factors

Other considerations include the size of the employer (small businesses often receive discounts), safety programs in place, and whether the employer opts for voluntary coverage extensions.