Experience Modification Rate
A multiplier applied to workers compensation premiums based on an employer's actual loss experience compared to the expected losses for their industry classification.
What It Is
The Experience Modification Rate (EMR or e-mod) is a numerical factor that adjusts an employer's workers compensation premium based on their historical claim experience compared to the average for businesses of similar size in the same industry classification. An EMR of 1.00 means the employer's experience is exactly average. An EMR below 1.00 (a 'credit mod') indicates better-than-average experience, reducing premium. An EMR above 1.00 (a 'debit mod') indicates worse-than-average experience, increasing premium.
The EMR is calculated by the National Council on Compensation Insurance (NCCI) in most states, or by independent state rating bureaus in monopolistic/independent states. The calculation uses three years of loss data with a one-year lag (e.g., the 2025 EMR uses losses from 2021-2023).
The formula splits losses into primary losses (the first $18,500 of each claim in most states, which measures frequency) and excess losses (amounts above $18,500, which measure severity). Frequency is weighted more heavily than severity because it is a more reliable predictor of future losses.
Why It Matters for Brokers
The EMR is the most impactful controllable factor in workers compensation pricing. A move from 1.20 to 0.85 on a $200K premium base saves the client $70K annually. Beyond insurance, the EMR is used as a safety metric by general contractors — many GCs require subcontractors to have an EMR below 1.00 to qualify for projects. Brokers who help clients understand and improve their EMR deliver tangible financial value.
Real-World Example
A plumbing contractor with a manual premium of $145K has an EMR of 1.28 due to a cluster of repetitive motion injury claims over the past three years. Their modified premium is $145K × 1.28 = $185,600. The broker implements a return-to-work program and ergonomic improvements. Over two years, the EMR drops to 0.92, reducing the modified premium to $133,400 — a $52,200 annual savings that also allows the contractor to qualify for more general contractor project requirements.
Common Mistakes
- 1Not reviewing the EMR worksheet for errors — studies suggest up to 50% of experience modifications contain correctable errors in payroll or loss data.
- 2Failing to report corrected claim closures to the rating bureau, leaving old reserves inflated in the EMR calculation when claims have actually been resolved for less.
- 3Ignoring medical-only claims in EMR management — while medical-only claims are discounted 70% in the formula, frequent small claims still significantly impact the EMR through the primary loss component.
How brokerageaudit.com Handles This
The system imports EMR worksheets, validates the underlying data against actual payroll and loss records, and identifies potential errors that could be corrected to lower the modification. It tracks EMR trends over time and projects future EMR changes based on current open claims.