Glossary

Underwriting

How an insurer selects, prices and sets terms for risks, and the profit or loss it earns on that business before investment income.

Also called: insurance underwriting, risk selection, underwriting profit

Underwriting is how an insurer decides which risks to take and at what price. It runs the whole chain: gather information, classify the risk, price it, set limits, deductibles and exclusions, accept or decline, and monitor the account afterward. The underwriter does the work, using filed rating plans, appetite guidelines and judgment.

The word has a financial meaning too. The underwriting result is earned premium minus incurred losses and expenses, leaving out investment income. The combined ratio expresses it: below 100 is an underwriting profit. NCCI reported a private-carrier workers' comp combined ratio of 91 for 2025 and 86 for 2024 (State of the Line, 2026). An insurer can lose money on underwriting and still earn a profit from investments, but a long run of underwriting losses forces rate increases and tighter terms. That is the engine of the hard-market cycle.

Buyers meet underwriting as appetite, application questions, inspections and the decision to decline, nonrenew or reprice. Disciplined underwriting is also what keeps a carrier solvent to pay claims years later. The guide on underwriting appetite: why one insurer wants you and another doesn't explains why carriers differ on the same account, and the combined ratio: how insurers make (and lose) money on underwriting shows how results are measured.

Last reviewed October 10, 2026

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Related terms

Underwriter The insurer's risk evaluator who decides whether to offer coverage, on what terms and at what price, within the authority the company grants. Combined ratio An insurer's claims costs plus operating expenses as a share of premium; below 100% means an underwriting profit and above 100% an underwriting loss. Loss ratio Incurred claim costs divided by earned premium, shown as a percentage; the basic gauge of whether the premium collected is covering claims. Schedule rating An underwriter's credits or debits to manual premium for risk traits that manual rates miss, such as premises condition, safety program or management quality. Written premium The total premium on policies an insurer issues or renews in a period, counted when written, whatever share of the coverage period has passed.

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