Experience modification rate (EMR)
Also known as: EMR, mod rate, experience modifier
Workers compensation insurance multiplier based on a company's claims history. EMR of 1.0 is industry average; below 1.0 saves money; above 1.0 costs more. Major impact on premium cost.
The Experience Modification Rate (EMR or 'mod rate') is a multiplier applied to a company's workers compensation insurance premium based on the company's actual claims history compared to industry expectations. Calculated annually by NCCI (National Council on Compensation Insurance) or state workers comp authorities.
The baseline is 1.0 — exactly average for the industry. Companies with claims experience better than expected get an EMR below 1.0 (a discount on premiums); companies with worse experience get an EMR above 1.0 (a surcharge). EMR ranges typically run 0.65-1.50 for service businesses; some bad-experience contractors face EMR above 2.0.
The financial impact is significant. A service business paying $20,000 in workers comp at 1.0 EMR pays $13,000 at 0.65 EMR or $30,000 at 1.50 EMR — same workers, same payroll, dramatically different cost based on safety record.
For service operators, EMR management is multi-year work. Reducing claim frequency (better safety training, PPE compliance, vehicle safety policies) and claim severity (return-to-work programs, light-duty assignments) over 3-year rolling windows steadily reduces EMR. Many large commercial customers also require EMR below 1.0 as a prerequisite for bidding work — making EMR a market access issue beyond just premium cost.
Related terms
1099 vs W-2 classification
Tax classification of workers. W-2 employees: company withholds taxes, provides benefits, controls work. 1099 contractors: self-employed, no withholding, less control. Misclassification carries serious penalties.
Workers compensation insurance
Required insurance covering medical costs and lost wages for employees injured on the job. Cost varies by industry risk class and EMR. Major operating expense for service businesses.