What is the 80% rule for insurance?

Written by Editorial Team | Last Updated: August 2026

The eighty percent insurance rule—commonly found in property and casualty policies—is a coinsurance requirement designed to ensure that property owners insure their buildings for an adequate percentage of their actual replacement cost. It dictates that the policyholder must carry hazard insurance coverage equal to at least eighty percent of the home's total replacement value; otherwise, if a partial loss occurs, the insurer will penalize claim payouts by reducing reimbursements proportionally based on the underinsurance deficit.

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