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A business owner files a $200,000 claim after a fire, carries a $700,000 limit on the building and expects a check for everything above the deductible. The adjuster sends about $150,000. Nothing was excluded and the limit was nowhere near used up. The gap came from one condition in the policy most owners never read closely: coinsurance. It is a penalty for insuring property for less than it is worth, and it bites hardest on partial losses, where the limit looks more than adequate.
Commercial property policies built on the standard building and personal property form include a coinsurance condition. In plain terms, the insurer will not pay the full amount of a loss if the value of the covered property at the time of loss, multiplied by the coinsurance percentage on the declarations, is greater than the limit you carried.
The percentage is usually 80, 90 or 100 percent. At 80 percent, a building worth $1,000,000 must be insured for at least $800,000 to avoid a penalty. At 90 percent, the requirement rises to $900,000. Carry less than that, and the policy treats the business as sharing the loss with the insurer, which is where the name comes from.
The standard formula works like this:
If the ratio in Step 2 is 1.0 or higher, there is no penalty. Carrying more than required does not earn a bonus; the business is simply paid the loss minus the deductible.
Take a small office building in Tampa. At the time of a fire, the building would cost $1,000,000 to replace. The policy has a 90 percent coinsurance clause, a $700,000 limit and a $5,000 deductible. The fire causes $200,000 of damage.
The owner absorbs about $49,444 of a $200,000 loss, far more than the deductible alone. Had the limit been $900,000, the payment would have been $195,000. Had the same $700,000 limit been written with 80 percent coinsurance instead, the requirement would have been $800,000 and the payment about $170,000.
The test uses the property's value when the loss happens, not when the policy started. That single detail explains many coinsurance surprises:
The test is also run for each location and coverage that carries its own limit. A building can pass while the business personal property at the same address fails, or the reverse, so each limit needs its own current value.
Coinsurance can apply whether the policy values property at actual cash value or replacement cost. With replacement cost, it is especially important to keep values current, because that is the figure the calculation will use.
Property rates are built around 80 percent coinsurance. Under the long-standing standard rating approach, choosing 90 percent earns a rate credit of about 5 percent and choosing 100 percent about 10 percent, while writing a policy with no coinsurance condition at all generally means a surcharge. Some coverage extensions in the standard form also apply only when a coinsurance percentage is chosen.
The higher percentages save premium but leave less room for error. A business confident in its valuations may take the credit. One unsure of its numbers may prefer 80 percent, or insure to full value while electing a lower percentage, which gives a cushion if values rise during the year.
The cleanest fix is the Agreed Value optional coverage available with the standard form. The business and the insurer agree on the property's value before a loss, covered losses are adjusted on that agreed figure, and the coinsurance condition is suspended while the agreement is in force. The agreed value has an effective period shown on the declarations, so it has to be renewed with updated figures to keep working. If values change sharply partway through the term, raise it with the insurer rather than waiting for the next renewal.
Other tools include:
For Florida owners, the same valuation can also drive what a percentage windstorm deductible costs after a hurricane, which is another reason to get the number right. A business insurance review is the natural time to test both.
Does coinsurance apply to a total loss?
On a total loss, the payment is capped by the limit anyway, so the practical problem is simply being underinsured. The penalty formula matters most on partial losses, where an owner expects to be paid in full and is not.
Is commercial property coinsurance the same as health insurance coinsurance?
No. In health insurance, coinsurance is the share of each bill a patient pays after the deductible. In commercial property insurance, it is a condition that reduces claim payments when the limit is too low relative to the property's value.
Can I remove the coinsurance clause from my policy?
Often, yes, through the agreed value option, which suspends coinsurance for the agreed period. Writing coverage with no coinsurance percentage is also possible with some insurers, usually at a higher rate.
How often should business property values be updated?
At least at every renewal, and sooner after renovations, major equipment purchases or a large change in inventory. Building costs and stock levels move during the year, and the calculation uses the value on the day of the loss.
Pull your property declarations and find three numbers: the limit, the coinsurance percentage and the date your values were last updated. If the values are more than a year old or were never professionally checked, that is the place to start. Truscott can help you compare carriers that offer agreed value terms and set limits that match what it would really cost to rebuild and restock. When you have current figures, request a business quote to see the options side by side.
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