What EMR actually compares
EMR compares your business's actual workers compensation losses against the losses expected for a business of similar size and classification, using a formula that also weighs frequency of claims more heavily than severity of any single claim.
An EMR of 1.0 means your losses match the expected average; above 1.0 means worse than expected; below 1.0 means better than expected — and it's usually calculated using a rolling window of the prior three completed policy years, not just the most recent one.
Why frequency matters more than a single large claim
A single large claim affects EMR less than several smaller, frequent claims — this surprises contractors who assume one bad incident is the whole story. A pattern of smaller injuries can push EMR up more than one significant but isolated claim.
This is a deliberate design choice in the formula: frequency is considered a stronger predictor of future losses than the size of any one incident.
What actually moves EMR in the right direction
Consistent workplace safety programs, prompt and well-managed claims handling (getting injured workers appropriate care quickly, managing return-to-work), and accurate classification all contribute to a lower EMR over time.
Because of the rolling calculation window, improvements take a few years to fully show up — which is exactly why starting early, rather than waiting for EMR to become a bidding problem, matters.
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Frequently asked questions
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What does an EMR of 1.0 mean?
It means your business's actual workers comp losses match the expected average for a similarly sized, similarly classified business — the baseline, neither better nor worse than typical.
Does one large claim ruin my EMR?
Not necessarily as much as contractors expect — the formula weighs frequency of claims more heavily than the severity of any single incident, so several smaller claims can affect it more.
Can a high EMR stop me from bidding certain projects?
Yes — many public agencies and larger general contractors set a maximum EMR as a bidding requirement, independent of any premium impact.
How long does a bad EMR year stay on my record?
EMR is typically calculated using a rolling window of the prior three completed policy years, so a bad year affects several renewal cycles before it rolls off.
How is EMR different from a simple loss ratio?
EMR compares a business's actual claims history to expected losses for similar businesses in the same classification, weighted by state-specific formulas — it's a relative benchmark, not a simple ratio of premium paid to claims paid.
Does EMR follow the business or the owner personally?
EMR is tied to the business entity (and its NCCI or state rating bureau file), not the individual owner — though a new entity with the same ownership and operations can sometimes inherit the prior entity's experience under certain rules.
Can subcontractor claims affect the hiring contractor's own EMR?
No — claims on a subcontractor's own workers compensation policy affect the subcontractor's own EMR, not the hiring contractor's, which is part of why verifying subcontractor coverage matters.