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💰 '''Loss cost''' is the portion of an [[Definition:Insurance premium | insurance premium]] that represents the expected amount needed to pay [[Definition:Claim | claims]] and [[Definition:Loss adjustment expense (LAE) | loss adjustment expenses]], excluding the insurer's [[Definition:Expense loading | expense loading]], [[Definition:Profit margin | profit margin]], and [[Definition:Contingency loading | contingency provisions]]. In [[Definition:Rate making | rate making]], loss costs serve as the foundational building block upon which final rates are constructed. Advisory organizations such as the [[Definition:Insurance Services Office (ISO) | Insurance Services Office (ISO)]] and the [[Definition:National Council on Compensation Insurance (NCCI) | National Council on Compensation Insurance (NCCI)]] publish prospective loss costs that individual [[Definition:Insurance carrier | carriers]] can then modify with their own [[Definition:Loss cost multiplier (LCM) | loss cost multipliers]] to arrive at filed rates.

⚙️ Calculating loss costs begins with analyzing historical [[Definition:Loss experience | loss experience]] data, adjusting it for [[Definition:Loss development | loss development]], [[Definition:Trend factor | trend]], and other actuarial modifications to project what future losses are likely to be on a per-[[Definition:Exposure unit | exposure-unit]] basis. An [[Definition:Actuary | actuary]] might take five or more years of [[Definition:Incurred loss | incurred losses]] for a given [[Definition:Line of business | line of business]], develop them to ultimate using [[Definition:Loss development factor | loss development factors]], apply trend adjustments for inflation or changes in claim severity, and then divide by the corresponding [[Definition:Earned premium | earned exposures]]. The resulting loss cost reflects the pure cost of expected losses and provides a standardized benchmark that promotes consistency across the market while still allowing carriers to compete on their own expense efficiency and [[Definition:Underwriting | underwriting]] judgment.

📈 The distinction between loss costs and final rates matters enormously for market transparency and [[Definition:Insurance regulation | regulatory]] oversight. Because advisory organizations file loss costs rather than complete rates, individual insurers retain the flexibility to differentiate themselves — a carrier with superior [[Definition:Loss control | loss control]] services or lower operating expenses can apply a smaller multiplier and offer more competitive pricing. This framework, which replaced the older practice of filing complete advisory rates in many jurisdictions, strikes a balance between the [[Definition:Antitrust | antitrust]] concerns of collective rate making and the actuarial necessity of pooling data across carriers to produce statistically credible projections. For [[Definition:Insurtech | insurtech]] companies building pricing engines, understanding loss cost methodology is essential to developing rates that are both competitive and actuarially sound.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Rate making]]
* [[Definition:Loss cost multiplier (LCM)]]
* [[Definition:Pure premium]]
* [[Definition:Loss development factor]]
* [[Definition:Insurance Services Office (ISO)]]
* [[Definition:Expense loading]]
{{Div col end}}

Definition:Loss cost - Revision history

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