Workers Comp Experience Modifier (E-Mod)

What Is the Experience Modifier?

The experience modifier, commonly called the e-mod or EMR, is a multiplier applied to your workers compensation premium that adjusts your cost up or down based on your actual claims history compared to other businesses in your industry. An e-mod of 1.0 is average. Below 1.0 means your claims history is better than average and you pay less. Above 1.0 means your claims history is worse than average and you pay more.

For contractors, the e-mod is one of the most directly controllable factors in your insurance cost — and one of the most misunderstood.

How It Affects Your Premium

Your workers comp premium starts with a base calculation tied to your payroll and the class code rate for your type of work. The e-mod is then applied as a multiplier to adjust that base premium up or down. The actual premium calculation involves additional factors your insurer applies, but the e-mod's effect is straightforward: it scales your cost directly.

A Worked Example

A roofing contractor has $2,000,000 in annual payroll. For illustration, assume a class rate of $12.00 per $100 of payroll.

Base Premium = ($2,000,000 / 100) x $12.00 = $240,000

Now apply the e-mod:

• At e-mod 0.85 (better than average): $240,000 x 0.85 = $204,000

• At e-mod 1.00 (average): $240,000 x 1.00 = $240,000

• At e-mod 1.25 (worse than average): $240,000 x 1.25 = $300,000

The difference between a 0.85 and a 1.25 e-mod on this contractor is $96,000 per year in workers comp premium. That's real money — and it compounds over time because the e-mod is recalculated each year using a rolling three-year claims window.

What Drives the E-Mod Up

The e-mod is calculated using three years of claims data, excluding the most recent year. Two factors matter most.

Claim frequency carries more weight than claim severity in the formula. Three $10,000 claims will hurt your e-mod more than one $30,000 claim. This is intentional — frequent small claims signal a systemic safety problem, while a single large claim may be a one-time event.

Large claims are partially capped in the formula, so a catastrophic claim does less damage to your e-mod than you might expect. The specific thresholds vary by state and rating bureau, so ask your broker how claim limitations apply to your policy.

What You Can Do About It

Return-to-work programs are among the most effective tools available. Lost-time claims — where an injured employee misses work — are weighted more heavily in the e-mod formula than medical-only claims. When an injured employee can return to modified duty, the claim may be reclassified, which can reduce its impact on your e-mod. The specifics depend on your state's rules and how the claim is handled, so work with your broker and claims adjuster to understand what applies in your situation.

Contesting questionable claims matters. Not every claim that gets filed is legitimate or correctly classified. Work with your broker to review open claims and ensure they are coded correctly.

Reserves affect your e-mod even before a claim closes. Insurance companies set reserves — their estimate of what a claim will ultimately cost — and those reserves enter the e-mod calculation while the claim is still open. If a reserve is set too high, it inflates your e-mod prematurely. Ask your broker to review open claim reserves annually.

A credit e-mod (below 1.0) is also a bidding advantage. Many general contractors and project owners require subcontractors to show an e-mod below a threshold — commonly 1.0 or 0.95 — to qualify for work. A strong e-mod opens doors that a high one closes.

Where to Find Your E-Mod

Your e-mod appears on your workers comp policy declarations page. Your insurance broker can also pull your experience rating worksheet, which shows exactly how your claims history is being calculated. If you have not reviewed that worksheet recently, ask for it — it is worth understanding.