How Do Insurance Companies Make a Profit From Premiums? (2026)

The combined ratio measures underwriting profitability by adding the loss ratio and the expense ratio. The loss ratio is the percentage of premiums paid out as claims. The expense ratio covers administrative costs, agent commissions, and overhead. A combined ratio below 100% means the insurer made an underwriting profit. A ratio above 100% means it paid out more than it collected in premiums — and must rely on investment income to stay profitable.

Insurance companies hold large reserves of premium money between the time they collect it and the time they pay out claims. This pool of funds — often called the "float" — is invested in bonds, equities, and other assets. Investment income may allow an insurer to remain profitable even when its combined ratio exceeds 100%. Regulators monitor investment strategies to ensure insurers maintain adequate reserves to pay future claims.

Actuaries use statistical models and historical data to estimate the probability and cost of future claims for each risk category. They set premiums high enough to cover expected claims, expenses, and a profit margin. Factors they consider include age, location, claims history, and industry-wide loss trends. Actuarial science is the mathematical foundation that makes insurance financially sustainable.

Insurance is regulated at the state level, not the federal level. Each state's Department of Insurance must approve the rates insurers charge in that state. The National Association of Insurance Commissioners (NAIC) coordinates standards and data sharing across all 50 states. Regulators review financial statements to ensure companies hold sufficient reserves to pay policyholders even in catastrophic loss years.

Insurers balance affordability with profitability — if premiums are too high, customers leave; if too low, the insurer may become insolvent. State regulators protect consumers by reviewing rate filings and requiring minimum reserve levels. You can compare your state's insurance market data through your state's Department of Insurance website. If you believe a rate is unjustified, most states allow you to file a formal rate complaint.