Experience Modification Rate (EMR): What It Costs

Your experience modification rate (EMR), also called an e-mod or X-mod, is a multiplier that raises or lowers your workers comp premium based on your own injury record. At 1.00 you pay what businesses of your size and industry are expected to pay. At 1.25 you pay 25 percent more than a business with the same payroll and a clean record, so a $100,000 premium becomes $125,000.

Most owners who cross 1.00 assume one serious injury did it. Usually it did not. The formula counts the first few thousand dollars of every claim far more heavily than the rest, so three $9,000 strains can cost more than one $60,000 shoulder surgery. And the injuries behind today's mod are already a year or more old.

What is an experience modification rate (EMR)?

An experience modification rate is a single number, centered on 1.00, that a rating bureau calculates for your business each year. The bureau (NCCI in most states) takes the payroll and claims your insurer reported and compares your actual losses over three years with the losses expected for businesses of your size and type of work. Match the expectation and you get 1.00; do better and you get a credit; do worse and you get a debit.

The mod appears on your policy's Information Page, in Item 4. It multiplies your manual premium, which is your payroll run through the published rates for your kind of work, before discounts, expense constants and surcharges. See how your experience modification changes the result:

Not every employer qualifies for experience rating. You qualify only if your premium exceeds a minimum set by the state, measured either over the most recent 24 months or as an average over the whole rating period. NCCI's "ABCs of Experience Rating" uses an example state that requires $14,000 over the most recent two years or a $7,000 average.^[1] Below that line, you pay the standard published rates and your claims never become a multiplier. Payroll and class codes build the premium your mod multiplies; see our workers compensation guide. California runs its own system through the WCIRB rather than NCCI; our guide to California workers comp class codes explains how it classifies payroll.

How is the experience modification rate calculated?

At its core, the formula is one ratio: your actual losses divided by the losses expected for your size and class codes. Three adjustments keep that ratio from swinging wildly. The first is the split point, a dollar line drawn through every claim. The part of a claim below the line is primary loss and counts at nearly full value. The part above it is excess loss, which the formula discounts and caps, so one catastrophic claim cannot wreck your rating on its own.

The split point is no longer one national number. NCCI retired the old uniform $18,500 split point in its Experience Rating Plan methodology update,^[2] and now files a state-specific split point with each state's annual loss cost filing. Oregon's is $10,000 for ratings effective January 1, 2026, according to the Oregon Workers' Compensation Division's Bulletin 209,^[3] while NCCI's own illustration puts a higher-severity state at $25,000.

Two more values finish the calculation. The weighting value decides how much of your excess loss counts at all, and it grows with size, because a larger employer has more claims and a more reliable record. The ballast value is a fixed amount added to both sides of the ratio, which pulls every mod toward 1.00. That is why a small employer's mod barely moves after a bad year, while a large employer's responds quickly. Both values are printed on your experience rating worksheet.

Why do small claims hurt your mod more than one big injury?

Small claims hurt more because the split point sits low, so the part of your record counted at full weight is close to a count of claims. Ten $12,000 claims produce about $120,000 of primary loss at nearly full weight. One $120,000 injury produces a single primary loss capped at the split point, plus a heavily discounted excess portion, so it moves your mod far less. This is deliberate. Ten sprains and cuts over three years point to a supervision problem that will keep producing claims, while one severe accident may just be bad luck.

Medical-only claims, injuries that need a doctor but cause no lost work days, get extra relief in most states. Where the rating bureau has approved the Experience Rating Adjustment (ERA), only 30% of such a claim counts, a 70% reduction to both its primary and excess portions. A few states, Colorado among them, never adopted the ERA, so medical-only losses count in full there.

That reduction also answers the owner tempted to pay a $600 medical bill out of pocket to keep a claim off the record. Part Four of your policy, which sets out your duties after an injury, forbids voluntary payments, and the claim would have counted for only a few dollars anyway.

Closing claims quickly matters for the same reason. An open claim counts at whatever the adjuster has reserved for it, and reserves are estimates. A claim carried at $40,000 that finally settles for $9,000 inflated your premium the entire time it was open, which is why the loss runs your carrier sends are worth reading line by line.

When does a claim start counting, and when does it drop off?

A claim starts counting once your insurer reports it to the bureau, about 18 months after the policy starts, and it stays in three consecutive mods. Your insurer, not you, sends the bureau a unit statistical report with the policy's audited payroll by class code and the amounts paid and reserved on each claim. The first report is valued 18 months after the policy's effective date, with yearly updates at 30, 42 and 54 months for claims that remain open. The mod is then issued about 90 days before its effective date using the three most recent complete years, skipping the latest policy year because its claims are too new to value reliably.

The valuation date controls, and it produces a lag that surprises owners. A claim that settles for $8,000 two weeks after the valuation date still enters your mod at its $45,000 reserve. Brokers who schedule a claim review with the adjuster around month 16, two months before valuation, give the adjuster time to close claims or reduce reserves while it still counts. If nobody has scheduled that review, ask for it.

How do you check your mod and fix an error?

Check your mod every year against your experience rating worksheet, because a mod above 1.00 costs contractors bids as well as premium. Prequalification platforms such as ISNetworld^[4] and Avetta^[5] collect your annual EMR letter and build it into the grade project owners see, and many owners screen out any contractor above 1.00.

Get your experience rating worksheet from NCCI or your state bureau each year; you or your designated broker are entitled to it. Check three things against your own records: that payroll by class code matches your final audit for each of the three years, that every claim listed is yours and shows the right value as of the valuation date, and that the ownership section is correct, because buying or selling a business can wrongly merge or split loss history under NCCI's ownership rules.

The same errors come up again and again: claims reported under the wrong policy, subrogation recoveries never credited back, claims reduced by the adjuster without a revised report, and estimated payroll that the audit never replaced. A corrected mod applies retroactively and produces return premium, but it moves only as fast as the paperwork. The insurer must file a revised unit statistical report before the bureau recalculates, and nobody will make that a priority but you. If a correction stalls, escalate in writing to the insurer, then through the bureau's appeal process, and finally to your state insurance department.

This guide is intended for informational use only, and outlines general information regarding typical provisions found in NCCI’s Standard Rating Plans and Policy Language. Your actual policy wording and/or endorsements govern. Contact a licensed agent/broker to discuss your exposures.

Reviewing your mod before renewal

Your experience modification rate turns your own claim history into a premium multiplier. Above 1.00, you pay more premium and lose bid invitations at the same time. How often you have claims matters more than how severe they are, and a claim reported this year is priced into three renewals. Pull your worksheet, compare the payroll and claim values with your own records, and dispute anything that does not match.