How Insurance Premiums Are Set, From Actuary to Filing

Insurance premiums are calculated by estimating the expected cost of claims for a group of similar customers, then adding the insurer's expenses, a margin for uncertainty, and any state-required charges. The estimate starts with actuaries, is written into a rate filing, and is reviewed by state regulators before it can be charged. No single number sets your price; a chain of estimates does. The basic trade is old and simple. As Wikipedia's insurance overview describes it, the policyholder accepts a known, relatively small loss — the premium — in exchange for the insurer's promise to pay if a covered loss occurs. Everything in the pricing process exists to make that promise safe to give. This guide follows that chain step by step: what the actuary does, what goes into the rate, what the state filing adds, and why two drivers with the same car can pay different amounts. Along the way, it separates what is established fact from what is interpretation. What does an actuary actually do?

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