noun · also: e-mod, EMOD, ex-mod
experience modifier
In plain English
A multiplier on your workers' comp premium based on your claim history vs. similar businesses.
1.00 is average. Below 1.00, you save money — your claims have been better than peers. Above 1.00, you pay more. Big employers track e-mods like a credit score because the difference between 0.85 and 1.20 is real money.
What it covers
Adjusts your manual workers' comp premium up or down. Calculated by NCCI (or the state rating bureau) using three years of payroll and loss history, lagging by one year.
What it does not cover
It is NOT a discount you negotiate. It's published — your e-mod is the same number at every carrier. What you can negotiate is the underlying loss-cost multiplier and any schedule credits.
Where it trips people up
Frequency hurts the e-mod more than severity. Five $10K claims is worse than one $50K claim because frequency is weighted heavier. Aggressive return-to-work and clinic-routing programs are how you keep the e-mod down.
The technical version
A multiplier applied to standard workers compensation premium that reflects an individual employer's loss experience relative to the average for similar employers in the same classification, calculated annually by NCCI or the applicable rating bureau.
Worked example
A 40-employee manufacturer with $40K manual premium.
- Year 1
- Three small back strains · $18K total · e-mod rises to 1.18
- Year 2
- Premium becomes $40K × 1.18 = $47,200
- Action
- Implements return-to-work + light-duty clinic
- Year 3
- Zero new claims · e-mod drops to 0.92
The result. premium drops to $40K × 0.92 = $36,800, a $10K+ swing year-over-year just from the e-mod movement. The savings compound — better e-mods unlock more carrier appetite at renewal.