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Experience Rating

A pricing method that adjusts manual premium up or down based on an insured's own historical loss experience relative to expected losses for their class.

businessPublished 2026/06/07Last verified 2026/06/07

FAQs

What is the difference between experience rating and schedule rating?
Experience rating uses historical loss data to calculate an actuarial modification. Schedule rating uses underwriter judgment to adjust premium based on specific risk characteristics — management quality, safety programs, premises condition — that are not captured in the statistical experience.
How many years of history are used in experience rating?
Most experience rating plans use three to five years of policy history, typically excluding the most recently completed policy year because its losses are not yet fully developed. The NCCI workers' compensation plan uses a three-year experience period.
Can an insured dispute their experience modification factor?
Yes. Insureds can request a review of their experience mod calculation if they believe claims data is incorrect — for example, if a claim was improperly included, misclassified, or should be excluded due to subrogation recovery. The rating bureau reviews and corrects errors.

Related Terms

  • Exposure Rating

    A loss estimation method using exposure data and loss development factors when an insured lacks sufficient credible historical loss experience.

  • Credibility Theory

    The actuarial framework setting how much weight an insured's own loss experience gets versus industry data when calculating experience-rated premiums.

  • Loss Cost Trend

    The annualized percentage change in loss costs over time, reflecting inflation, medical trends, and claim frequency shifts, used in ratemaking.

Related Items

  • Earnix

    AI rating, pricing optimization and decisioning

  • Hyperexponential

    Pricing decision platform for specialty insurers

  • Akur8

    AI pricing and rate modeling for actuaries

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Experience rating is an underwriting and pricing methodology that modifies the standard (manual) premium for an insured by comparing their actual historical loss experience against the expected losses for their risk class. Insureds with better-than-expected loss histories receive premium credits; those with worse-than-expected histories receive debits.

How it works / Why it matters

The core formula compares an insured's actual incurred losses over a defined experience period (typically three years) against their expected losses for that same period — derived from applying class rates to their historical exposures. The ratio of actual to expected losses, weighted by credibility theory factors that reflect the statistical reliability of the experience, produces an experience modification factor (or "mod"). The manual premium is multiplied by the mod to produce the experience-rated premium.

For workers' compensation, the NCCI administers the experience rating plan in most states, computing experience modification factors for eligible accounts annually. An account with a mod of 0.85 pays 15% less than the manual rate; a mod of 1.25 pays 25% more. The modification directly incentivizes insureds to invest in loss control, because their own claim history drives their future premium costs.

Experience rating creates a virtuous cycle in properly functioning markets: low-hazard, well-managed risks receive premium reductions that reward their investments in safety and loss prevention, while poor performers pay more, reflecting the actual cost of their claims to the insurance pool.

In practice

A manufacturing company with $5 million in workers' compensation payroll and three years of claims totaling $320,000 against an expected $250,000 will receive a debit mod above 1.0. The underwriter reviewing the account should analyze the nature of the losses — are they frequency-driven (many small claims) or severity-driven (one large claim)? This informs both the pricing decision and the loss control recommendations provided to the insured.

Experience rating is most meaningful for larger accounts where the loss experience has actuarial credibility. For smaller accounts, exposure rating dominates because the statistical noise in few claims makes the experience unreliable as a predictor. Pricing platforms such as Earnix and Hyperexponential enable sophisticated multi-variable experience rating that goes beyond simple mod calculations.

Related concepts

Credibility theory determines how much weight to assign to actual versus expected experience. Retrospective rating is a related pricing method that adjusts the final premium after the policy period based on actual losses — a more extreme form of experience-based pricing.