Combined Ratio: Where an Insurance Premium Actually Goes
Claims plus expenses over premiums earned. In 2024 — the US property and casualty industry's best underwriting year in over a decade — the aggregate combined ratio was about 96.5: roughly 72 cents of each premium dollar to claims, 25 to expenses, 3 to underwriting profit. Homeowners ran about 99.7, its first underwriting profit since 2019. Insurers are profitable mainly through investing the float, not underwriting.
The **combined ratio** is the standard measure of underwriting performance: claims plus expenses, divided by premiums earned, expressed as a percentage. Below 100 means the insurer made money on underwriting; above 100 means it paid out more than it took in and depends on investment income to be profitable overall. ## Where the money goes 2024 was the US property and casualty industry's best underwriting year in over a decade — an aggregate combined ratio of about **96.5**. A rough decomposition of each premium dollar in that unusually good year: - **~72 cents** — claims paid to policyholders - **~25 cents** — expenses (commissions, staff, claims handling, reinsurance, taxes) - **~3 cents** — underwriting profit The homeowners line specifically ran at about **99.7** — an improvement of over 11 points on the prior year, and its first underwriting profit since 2019. Those figures are the answer to the intuition that premiums are inflated by greed. In the industry's best year in a decade, the underwriting margin on home insurance was approximately zero. In bad years the industry loses money on underwriting outright. ## The consequence for pricing If about 97% of the premium is the cost of risk plus the cost of operating, then a hypothetical perfectly benevolent insurer taking no profit at all could cut prices by a few per cent — not by an order of magnitude. A US average home premium in the region of $2,400 a year sits on top of roughly $1,700 a year of expected claims. There is no fat to cut down to $365. **A thin margin in a competitive market is evidence that competition already removed the excess**, not evidence that the market is broken. ## Why insurers are profitable anyway Underwriting is not the whole business. Insurers collect premiums before paying claims, and the money held in between — the **float** — is invested. In lines where claims settle slowly, the float is large and long-lived, and investment returns on it are the real profit engine. See Insurance Float: The Berkshire Hathaway Model and Its Limits. This is why "combined ratio above 100" does not automatically mean an insurer is failing, and why the ratio must be read alongside investment income to judge a company. Related: Risk Pooling Reduces Uncertainty, Not Cost.