Overview
Many employers pay less for workers' compensation insurance when the method of calculating experience modifications is updated to reflect current claim costs. The experience modification factor (often called the mod) adjusts premium up or down based on a company's claims history relative to its peers.
One important component of the calculation is the split between the primary portion of a claim and its excess portion. That split determines how much influence each claim has on the mod and how the mod reflects smaller, more frequent claims versus a few large losses.
Key takeaways
- Experience modifications reward better-than-average claim performance and penalize worse-than-average performance.
- Raising the primary/excess split gives more weight to smaller claims when calculating the mod.
- Many businesses see modest rate reductions when the split is adjusted to reflect inflation and current claim patterns.
How it works
The experience mod compares your actual losses to expected losses for businesses of the same size and industry. A lower-than-expected loss pattern produces a credit; a higher pattern produces a debit.
Because the primary portion of each loss has a greater statistical impact on predicted future losses, changing the primary/excess threshold changes how individual claims influence your mod. For a clear explanation of how that threshold functions, see Understanding Split Point in Workers' Compensation Insurance.
What it may cover (and what it may not)
The experience mod affects the cost of workers' compensation insurance premiums and reflects the employer's claims history; it does not directly pay for individual medical expenses or lost wages. Those benefits are handled through the claims process itself under your workers' compensation policy.
Changes to the split point can lower premiums for businesses with controlled frequency of smaller claims, but they will not eliminate premiums for employers with large or persistent loss patterns.
Common mistakes to avoid
Assuming a change to the split automatically reduces your premium is a mistake; the mod is one of several rating components, and payroll, classification codes, and state-specific rules also matter.
A second mistake is not reviewing claim detail: aggregate numbers can hide patterns such as many small claims or a single high-severity claim that will affect your mod differently.
For employers with an unusually high mod, learning specific corrective strategies can help; see High X-Mod Workers Comp for common causes and management approaches.
Questions to ask an agent
How is our current experience modification calculated, and what split point was used in the most recent calculation?
Which recent claims are influencing our mod the most, and are there documentation or return-to-work steps that could improve outcomes?
What specific premium impacts should we expect from a changed split point, and which other rating factors might offset that impact?
Next steps
Request a review of your loss run history so you understand which claims are driving your mod and where improvements are possible.
Work with your broker or carrier to confirm payroll classifications and to discuss loss-control options that reduce claim frequency and severity.
If you want to formalize a review or compare renewal options, schedule time to talk to an agent who can walk through your specific situation and potential savings.
Frequently Asked Questions
What is an experience modification (mod)?
The mod is a numeric factor applied to workers' compensation premiums to reflect a company's claims history relative to its industry peers.
Why does the primary/excess split matter?
The split determines how much weight small, frequent claims have versus large, infrequent claims in the mod calculation.
Will every employer save money when the split point is raised?
No. Many employers may see modest reductions, but larger employers with serious claims may see increases depending on their loss pattern.
How often are these split thresholds reviewed?
Rating organizations and regulators periodically review thresholds to keep them aligned with medical inflation and evolving claim costs.