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An experience modification factor, the e-mod, is a multiplier applied to your workers' compensation premium that compares your actual claims history to other businesses your size in your industry. A mod of 1.0 is average. Below 1.0 earns a discount; above 1.0 is a surcharge. A 1.25 mod means you pay 25 percent more than an average peer, every year it persists, which makes the mod one of the few insurance numbers a business can directly manage.
Rating bureaus, NCCI in most states and independent bureaus in others, collect three years of your payroll and claims data, excluding the most recent year. The formula weighs claim frequency more heavily than severity: several small claims hurt your mod more than one large one, because frequency predicts future losses. Each claim's primary layer counts fully and the excess portion is discounted, which is the formula's way of saying that how often people get hurt matters more than how expensive the worst injury was.
The mod multiplies the entire premium, so a 1.30 on a $200K workers' comp bill is $60K of annual surcharge against an average peer, and $80K or more against a well-run one operating below 0.90. The mod also gates work: many general contractors and project owners refuse bids from subcontractors with mods above 1.0, which turns a bad mod into lost revenue, not just higher premium. For labor-intensive businesses, the mod is frequently the largest controllable line in the insurance budget.
The mod responds to discipline. Prevention: real safety programs targeted at your actual injury patterns, not binder-ware. Claims management: report injuries immediately, direct care where permitted, and stay engaged, because claims that drift unmanaged settle worse. Return-to-work: light-duty programs cut claim cost dramatically, because a claim with wage replacement costs far more than one without. Audit your mod worksheet annually too. Payroll misclassifications and claims that should have closed routinely inflate mods until someone checks.
Three policy years, entering the calculation after a one-year lag. A claim from four years ago has typically aged out. This is why mod improvement is a multi-year project and why starting now matters.
Most use NCCI's formula, but several large states run independent bureaus with their own calculations, and the four monopolistic states handle rating through their state funds. The management disciplines are the same everywhere.
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