An Experience Modifier, often called an Experience Mod or EMR (Experience Modification Rate), is a numerical factor used to adjust an insurance premium based on a business's historical claims performance. The modifier compares an individual business's loss experience against similar businesses in the same industry. Companies with better-than-expected loss histories generally receive lower modifiers, while companies with higher-than-expected losses receive higher modifiers. The Experience Modifier is one of the most influential rating factors in commercial insurance, particularly for Workers' Compensation insurance.
Standard insurance rates are based on industry averages. However, not every company performs the same.
Two contractors may have:
One company may have very few workplace injuries, while the other experiences frequent claims. The Experience Modifier allows insurance pricing to reflect those differences.
The modifier is applied as a multiplier during the premium calculation.
A simplified formula looks like this: Calculated Premium × Experience Modifier = Adjusted Premium
For example:
Premium Before Modifier: $100,000
Experience Modifier: 0.85
Final Premium: $85,000
If another company has a modifier of: 1.20
Final Premium: $120,000
The modifier directly affects the final premium.
The Experience Modifier is centered around 1.00.
A value below 1.00 generally indicates better-than-average historical loss performance.
Examples:
These modifiers typically reduce premium.
A modifier of 1.00 generally represents average expected loss experience for similar businesses.
Premium remains unchanged by the modifier.
A modifier greater than 1.00 generally reflects higher-than-average losses.
Examples:
These modifiers increase premium.
Although calculation methodologies vary by jurisdiction and rating organization, common factors include:
The modifier is based on statistical analysis rather than underwriter judgment.
These terms are closely related but have different meanings.
The methodology used to evaluate historical claims performance and adjust premium.
The numerical factor produced by the experience rating process.
In simple terms: Experience Rating is the process. Experience Modifier is one of the results.
These two adjustments serve different purposes.
Both may affect premium, but they originate from different rating processes.
A favorable modifier can significantly reduce insurance costs over many years.
Businesses often invest in:
These efforts can improve long-term claims performance and positively influence future modifiers. For insurance carriers, modifiers improve pricing accuracy and reward safer businesses.
Enterprise commercial insurance rating systems automate experience modifier calculations within the broader rating workflow.
Modern platforms can:
Automation eliminates manual entry errors and ensures consistent premium calculations.
The modifier is generated through established rating methodologies rather than individual underwriting discretion.
Other factors such as payroll, classification, territory, and carrier pricing also affect the final premium.
As a company's claims experience changes, its modifier may also change. Maintaining strong safety performance helps improve long-term results.
Selectsys Tech develops enterprise commercial insurance rating platforms that automate experience modifier calculations as part of complete commercial insurance rating workflows.
Our solutions support:
The result is faster, more accurate, and more consistent commercial insurance pricing.