The Coinsurance Formula Explained
Quick Answer: Commercial property policies often contain a ‘Coinsurance Clause,’ requiring you to insure the property for at least 80% (or 90%) of its replacement value. If you underinsure to save premiums, and a loss occurs, the carrier applies a penalty formula: (Did Carry / Should Carry) x Loss = Payout. This means you could receive only 50% of a partial loss, not just the limit cap. We help document accurate valuation to avoid this trap.
Key Takeaways
- 1. Must insure >80% of value.
- 2. Penalty applies to *partial* losses too.
- 3. Valuation accuracy is key.
Understanding the math behind your commercial policy is critical before disaster strikes. Many business owners assume that as long as their claim is under their total policy limit, they will be fully covered. Unfortunately, the coinsurance clause changes the game entirely.
‘You saved money on premiums, but you bought a penalty. If you only insured half the value, they only pay half the claim. It’s simple math, and it hurts.’
| Value | Insured Amount | % Carried | Penalty? |
|---|---|---|---|
| $1M | $800k | 80% | No (Full Pay) |
| $1M | $400k | 40% | Yes (50% Pay) |
Replacement Cost vs. Actual Cash Value
The “Should Carry” portion of the formula is determined by the valuation method listed in your policy. If your policy is based on Replacement Cost, the carrier looks at what it would cost to rebuild your facility today with modern materials, not what you paid for it or its current market real estate value. Failing to account for inflation in construction costs is the fastest way to trigger a penalty.
Avoiding the Penalty with Agreed Value
The most effective way to bypass the coinsurance trap is through an “Agreed Value” endorsement. This waives the coinsurance clause for the policy term, provided you and the carrier agree on the property value upfront. This provides certainty during the claims process, especially in complex commercial water damage restoration scenarios where costs can escalate quickly.
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Don’t wait for a claim to find out you’re underinsured.
Frequently Asked Questions
What is the coinsurance penalty?
A penalty applied when a property is underinsured (below the required %, usually 80%). The payout is reduced by the ratio of coverage carried vs. required.