Your EMR Directly Impacts Your Premium
Your experience modification rate compares your claims history to similar businesses. It's a multiplier that directly affects what you pay for workers' compensation. Understanding how it works helps you manage costs. In California, the Workers' Compensation Insurance Rating Bureau (WCIRB) calculates experience mods; in Arizona, Nevada, Texas, and most other states, NCCI or another rating bureau does.
What EMR Means
| EMR Value | Interpretation |
|---|---|
| 1.0 | Average for your industry and size |
| Below 1.0 | Fewer or smaller claims than average |
| Above 1.0 | More or larger claims than average |
The difference is significant. A 0.8 EMR means you pay 20% less than baseline. A 1.3 EMR means you pay 30% more.
How EMR Affects Your Bill
Your premium is calculated as base rate multiplied by payroll divided by 100, then multiplied by your EMR.
Example with $500,000 payroll at a $10 rate:
At 1.0 EMR, you pay $50,000. At 0.8 EMR, you pay $40,000. At 1.2 EMR, you pay $60,000.
That's a $20,000 swing between the best and worst scenarios in this example.
Why It Matters More in 2026
The base rate matters too. For California policies starting on or after September 1, 2026, the average advisory pure premium rate rose 6.6% to $1.65 per $100 of payroll, as approved by the California Department of Insurance. A higher base makes every point of your mod worth more in dollars. See what the September 2026 change means.
How EMR Is Calculated
The calculation considers your claims frequency, claim severity, and how your experience compares to what's expected for businesses of your size and classifications.
The experience period typically uses three years of history, ending about a year before the mod takes effect, so the most recent policy year isn't included yet.
What Hurts Your EMR
High Claim Frequency
Several small claims can hurt more than one large claim of the same total, because the formula limits how much of any single claim counts in full. Frequent claims also suggest systematic safety problems to underwriters.
Severe Claims
Large losses with high medical costs, extended time off work, and permanent disabilities drive EMR up. But the formula caps how much of a single large loss counts, which is why frequency tends to weigh more heavily than severity.
Open Claims
Unresolved claims are carried at reserve estimates, which may be higher than final settlement. Closing claims can help your EMR.
Improving Your EMR
Prevent Claims
The best strategy is avoiding injuries entirely. Safety programs, training, proper equipment, and hazard elimination all reduce claim frequency. Our safety programs guide covers what a workable program looks like.
Manage Claims Well
When injuries occur, report immediately. Provide quality medical care. Implement return-to-work programs to get injured employees back on modified duty. Stay engaged with your carrier on claim management.
Review Your Worksheet
Get your mod worksheet from your agent and check for errors. Claims that aren't yours. Closed claims still showing as open. Classification errors that affect calculations.
Timeline of EMR Impact
| Year After Claim | Impact on EMR |
|---|---|
| Year 1 | Not yet included in calculation |
| Years 2-4 | Included in your mod |
| Year 5+ | Drops out of calculation |
This means the effects of a bad claim typically persist for three mod years. Improvements also take time to fully reflect.
Working With Your Agent
Your agent can obtain your mod worksheet, review it for accuracy, identify improvement strategies, and explain the calculations. Use this expertise. Errors in payroll, classifications, or claim values do happen, and they are worth checking every year.
Common Questions
When does EMR start applying?
When your workers' comp premium or payroll reaches the eligibility threshold set by the rating bureau. In California, the WCIRB publishes the threshold, and it is adjusted periodically. Your agent can tell you whether you qualify. See our California workers' comp page for more on how California rates work.
Can I reduce EMR quickly?
No quick fixes exist. Improvements take 2 to 4 years to fully reflect as old claims roll off and new clean history enters the calculation. Start improving safety now.
Do all claims affect EMR equally?
No. Frequency generally hurts more than severity. Many small claims can damage your EMR more than one large claim. If you'd like a second look at your mod and premium, request a quote.