What is an experience modification rate and how does it affect apartment insurance?

The experience modification rate (EMR or mod) is a factor applied to workers compensation premiums that compares an employer's actual loss experience to the expected losses for similar employers in the same industry. An EMR of 1.0 means the employer's losses are exactly average. An EMR below 1.0 means better-than-average experience (resulting in a premium discount), and an EMR above 1.0 means worse-than-average experience (resulting in a premium surcharge).

The EMR is calculated by the National Council on Compensation Insurance (NCCI) in most states, or by the state rating bureau in monopolistic or independent-bureau states (including California, Delaware, New Jersey, New York, and Pennsylvania). The calculation uses three years of payroll and loss data, with the most recent year excluded. For apartment operations, the relevant NCCI class codes include 9015 (buildings, NOC, operation by owner or lessee) and 8810 (clerical office employees).

The financial impact is direct and significant. If your base workers compensation premium is $20,000 and your EMR is 1.25, your actual premium is $25,000. If your EMR improves to 0.85, the premium drops to $17,000. Beyond premium impact, many general contractors and property management companies require subcontractors and vendors to maintain an EMR below 1.0 as a condition of engagement.

Apartment owners can improve their EMR by implementing formal safety programs per OSHA standards (29 CFR 1910), conducting regular safety training, establishing return-to-work programs for injured employees, and reporting claims promptly to ensure effective claims management. Even small claims affect the EMR because the NCCI formula weights claim frequency more heavily than severity.