What does "pro rata share" mean in insurance?

"Pro rata share" in insurance refers to the method of allocating a loss among multiple insurance policies based on the amount each policy covers relative to the total amount insurable. When a loss occurs, the total amount of the claim is divided in proportion to the coverage limits of each policy involved.

For example, if there are two insurance policies that cover a loss—one for $100,000 and another for $300,000—and the total claim amount is $400,000, the first policy would cover 25% of the claim, and the second would cover 75%. This proportional sharing ensures that each insurer pays only their fair share of the loss, reflecting the extent of their financial commitment in the insurable interest.

This concept helps avoid situations where one insurer might pay more than their fair share, ensuring equity among policyholders based on their respective coverage. Consequently, this is why the correct understanding of "pro rata share" aligns with the division of loss according to the amount insured.