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⚠️ Coinsurance penalty is the financial reduction applied to a claim payment when a policyholder has insured property for less than the percentage of value required by the coinsurance clause in their property insurance policy. The clause — most often stipulating that the sum insured must equal at least 80, 90, or 100 percent of the property's actual or replacement cost value — exists to ensure that premiums are collected on a base that fairly reflects the full value at risk. When that condition is not met at the time of a loss, the insurer reduces the payout proportionally, and the shortfall the policyholder absorbs is the coinsurance penalty.

🧮 The calculation follows a straightforward formula: the insurer divides the amount of insurance actually carried by the amount that should have been carried (the coinsurance requirement multiplied by the property's value at the time of loss), then multiplies the result by the covered loss amount. If a building worth $1 million is insured for only $600,000 under a policy with an 80 percent coinsurance requirement, the policyholder has carried only 75 percent of the required $800,000. On a $200,000 partial loss, the insurer would pay just $150,000 — leaving the policyholder to fund the $50,000 gap out of pocket, on top of any applicable deductible. This penalty applies to partial losses; a total loss typically exhausts the policy limit regardless of coinsurance compliance.

💡 For agents, brokers, and risk managers, the coinsurance penalty is one of the most common — yet frequently misunderstood — sources of underinsurance disputes. Adequate property valuations and regular sum-insured reviews are the primary defenses against triggering the penalty, especially in periods of rapid construction-cost inflation. Some carriers offer an agreed value or stated amount endorsement that waives the coinsurance clause entirely in exchange for a verified appraisal, eliminating penalty risk. Understanding this mechanism is critical to ensuring that commercial policyholders receive the full benefit of their coverage when a loss occurs.

Related concepts:

• Definition:Coinsurance clause
• Definition:Underinsurance
• Definition:Replacement cost
• Definition:Agreed value
• Definition:Property valuation
• Definition:Sum insured