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Experience Modification Rate (EMR)

EMR is a claims-history-based multiplier, calculated by NCCI or a state rating bureau, that adjusts a contractor's workers' comp premium based on claims history versus peers. The formula weights claim frequency, via "primary" losses, far more heavily than raw severity.

An EMR of 1.0 represents average industry experience. Many owners require EMR below 1.0, increasingly below 0.85 for tier-one hyperscale projects, so a single severe, delayed-treatment injury can lock a contractor out of future bids for the full three-year window the claim remains in the calculation. On-site occupational care is a direct, measurable lever on this calculation because the formula is frequency-weighted.

Frequently Asked Questions

What EMR score do data center projects typically require to bid?

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.

Who calculates a contractor's Experience Modification Rate?

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.

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