Coinsurance in commercial property insurance is one of the most misunderstood parts of a property policy. Many business owners assume that if they have property coverage, they are fully protected after a loss. That is not always true. A coinsurance clause requires you to carry insurance equal to a stated percentage of your property’s value, often 80%, 90%, or 100%. If you insure the property for less than that amount, your insurer may reduce your claim payment, even when the loss is only partial. That means coinsurance is not shared payment between you and the insurer. It is a policy condition that can create a penalty when your property is underinsured. Why does coinsurance matter in commercial property insurance? Coinsurance matters because it affects what your policy may actually pay after a claim. A building can suffer a covered loss, but if the insurance limit is too low compared with the property’s value, the claim payment may be reduced. This usually becomes a problem when: property values have increased over time construction costs have gone up improvements were made but coverage limits were not updated business personal property values were estimated too loosely Coinsurance is only one part of a larger commercial property insurance decision, and it makes more sense when you understand how building coverage, contents, valuation, and policy limits work together. Many coverage problems do not come from having no insurance. They come from having limits that no longer match reality. How does a coinsurance clause work? A commercial property policy may require you to insure property to a percentage of its value. Common coinsurance requirements are 80%, 90%, or 100%. Here is the basic idea: Determine the property’s current value. Multiply that value by the coinsurance percentage. Compare that number to the limit you actually purchased. If your limit is lower than required, the insurer may reduce the claim proportionally.