EMR (Experience Modification Rate) is a multiplier, calculated annually by NCCI or a state rating bureau, that adjusts a contractor's workers' comp premium up or down based on claims history relative to industry peers in the same size and classification. The formula splits every loss into a "primary" portion, reflecting frequency, and an "excess" portion, reflecting severity, and weights primary losses far more heavily. Frequency, not raw severity, is what moves the number.
An EMR of 1.0 represents average industry experience. Many owners require EMR below 1.0 for prequalification, and hyperscale data center developers routinely set the bar at 0.85 or lower—some as tight as 0.75. Because EMR is calculated on a rolling three-year window of claims data, a single severe claim doesn't just cost a contractor money; it can lock them out of an entire category of bids for three full years after the claim closes.
This is where on-site occupational care becomes a direct, measurable lever rather than a soft safety benefit. Because the formula weights frequency so heavily, the leverage point isn't treating injuries better after the fact—it's keeping minor injuries from becoming formal claims at all. An injury treated on-site and closed out as first aid never enters the claims system. The same injury, sent instead to urgent care or the ED, generates a recordable claim that adds to frequency and stays in the EMR calculation for three years, regardless of how minor the original injury was.
Many owners and general contractors require an EMR below 1.0, and increasingly below 0.85 for tier-one hyperscale projects, as a bidding prerequisite. Confirm specific project requirements directly, as thresholds vary by owner.
EMR is calculated by the National Council on Compensation Insurance (NCCI) or an equivalent state rating bureau, based on a contractor's three-year historical claims experience relative to industry peers.
Every term here points to the same gap in healthcare access. See how the CareStation closes it.
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