Overview
Coinsurance is a clause in many commercial property insurance policies that shares the risk of loss between the insurer and the policyholder. It encourages businesses to carry adequate coverage by reducing the insurer's payment when coverage falls short of a set percentage of the property's insured value.
Rather than being a surcharge, coinsurance is a formula applied at the time of loss to determine how much the insurer pays. Understanding how that formula works helps you avoid unexpected out-of-pocket costs after a claim.
Key takeaways
- Coinsurance requires insuring property to a specified percentage of its value to avoid reduced claim payments.
- If you underinsure, the insurer may only pay a proportional share of a covered loss.
- Review your policy values regularly, especially after renovations or property purchases.
How it works
Most coinsurance clauses set a target, often expressed as a percentage of actual cash value or replacement cost. If the policy limit meets or exceeds that target, the insurer generally pays the full amount of a covered loss, subject to deductibles and policy limits.
If the policy limit is below the required percentage, the insurer applies a ratio that reduces the settlement. For example, if the required level is 80% and you insure for less, the insurer pays only the same proportion of the loss that your coverage bears to the required amount.
For more detail on options that can reduce exposure from underinsurance, see Coinsurance Deficiency Coverage.
What it may cover (and what it may not)
Coinsurance itself is not coverage; it is a policy condition that affects how much the insurer pays when a covered loss occurs. The underlying property policy may cover fire, wind, theft, and similar perils depending on the form you buy.
Coinsurance does not change what perils are covered or excluded. It only changes the loss settlement amount when your insured amount is below the required percentage of the property's value.
Common mistakes to avoid
- Underinsuring property values after renovations or new equipment purchases.
- Assuming replacement cost equals policy limit without verifying depreciation or ACV adjustments.
- Overlooking endorsement options or alternative forms of coverage that can mitigate coinsurance penalties.
Questions to ask an agent
What coinsurance percentage applies to my policy and how is the property's value determined? Ask for examples that show how a loss would be settled under current limits.
Are there endorsements or coverage forms available that reduce or remove the coinsurance requirement for my business type? For guidance on general policy types and how they relate to business operations, see Understanding Business and Renters Insurance.
How often should I update my insured values and what documentation will support those updates?
Next steps
Review the insured values on your property schedule and compare them to your best estimate of replacement cost or actual cash value. Keep documentation of recent improvements and appraisals to support any adjustments.
If you find your limits are below the coinsurance requirement, consider increasing coverage or adding endorsements that address deficiency. If you want help implementing changes or getting a quote, talk to an agent.
Frequently Asked Questions
What happens if I meet the coinsurance percentage?
If your policy limit meets or exceeds the required percentage, the insurer will generally pay the full covered amount of a loss, subject to the policy deductible and limits.
Can coinsurance apply to contents and business personal property?
Yes. Coinsurance can apply to building values, business personal property, or both, depending on the policy language and coverage sections.
Does coinsurance apply to replacement cost and actual cash value the same way?
The clause applies in principle to both, but the required basis (replacement cost vs. ACV) will change how values and depreciation are calculated in a claim.
How often should I have my property professionally valued?
Regular reviews—annually or after major changes—help avoid underinsurance, but the right frequency depends on how often your property inventory or improvements change.