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📊 '''Excess loss factor''' is an [[Definition:Actuarial analysis | actuarial]] metric used in insurance pricing — particularly in [[Definition:Workers' compensation insurance | workers' compensation]] and [[Definition:Large deductible program | large deductible programs]] — to estimate the proportion of total expected losses that will exceed a specified per-occurrence threshold. It quantifies the share of aggregate losses attributable to the portion of individual claims that pierces a given retention or limit, expressed as a ratio of excess losses to total expected losses for a given risk class.

🧮 Actuaries compute excess loss factors by analyzing historical [[Definition:Loss distribution | loss distributions]] for a particular line of business or classification code. For a chosen dollar threshold — say, $250,000 per claim — the factor captures how much of the total loss load falls above that level. If the excess loss factor at the $250,000 entry point for a given class is 0.15, it means 15% of the total expected losses come from the portion of claims exceeding $250,000 each. These factors are published in tables (such as those maintained by the [[Definition:National Council on Compensation Insurance (NCCI) | NCCI]] for workers' compensation) and updated periodically to reflect emerging loss trends. Insurers use them when structuring [[Definition:Retrospective rating plan | retrospective rating plans]], [[Definition:Excess-of-loss reinsurance | excess-of-loss reinsurance]] pricing, and self-insured retentions, translating raw expected losses into the portions retained versus transferred.

💡 Without accurate excess loss factors, an insurer cannot properly price the risk it assumes above a retention or properly credit the risk a policyholder keeps below one. In [[Definition:Large account pricing | large account pricing]], small changes in the excess loss factor can produce significant premium swings, making the selection of appropriate tables and trend adjustments a point of negotiation between [[Definition:Underwriting | underwriters]], [[Definition:Actuary | actuaries]], and [[Definition:Insurance broker | brokers]]. As loss patterns shift — due to medical cost inflation, legal environment changes, or shifts in claim severity — maintaining current and credible excess loss factor tables becomes a competitive advantage for carriers that need to price layered and retention-based programs accurately.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Expected loss]]
* [[Definition:Loss development]]
* [[Definition:Retrospective rating plan]]
* [[Definition:Workers' compensation insurance]]
* [[Definition:Excess-of-loss reinsurance]]
* [[Definition:Increased limits factor]]
{{Div col end}}

Definition:Excess loss factor - Revision history

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