Coinsurance Penalty After a Tornado: Two Limits, One Deductible
A Cedar Rapids machine shop insures its building and contents on an ISO commercial property form with 80% coinsurance and replacement cost: Building $1,200,000, Business Personal Property $400,000, $5,000 deductible per occurrence. Values were set in 2019 and never updated. A spring tornado causes $300,000 of building damage at today's replacement cost ($210,000 actual cash value) and $150,000 of contents damage at replacement cost ($110,000 actual cash value), including a $30,000 CNC machine leased from a vendor and in the shop's care. The building's actual replacement cost at the time of loss is $2,000,000; the contents' replacement cost is $600,000. The owner asks whether he should claim the loss on an actual cash value basis instead to avoid the penalty.
1. Compute the building settlement, showing the coinsurance test and each step.
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Step 1 - Did the insured meet the coinsurance requirement?
- Required: 80% × $2,000,000 replacement cost = $1,600,000
- Carried: $1,200,000
- Ratio carried ÷ required = $1,200,000 ÷ $1,600,000 = 0.75
The insured is underinsured, so the coinsurance penalty applies.
Step 2 - Apply the formula to the loss.
- $300,000 (replacement cost loss) × 0.75 = $225,000
- That figure is below the $1,200,000 limit, so it is not capped by the limit.
Step 3 - Compare to the ACV alternative. $210,000 × 0.75 = $157,500. The ACV basis is worse for the insured, because the penalty is a percentage of a smaller loss number.
Building payment before deductible: $225,000.
Key point: coinsurance applies only when the loss is settled at replacement cost; the insured must actually repair or replace to collect on that basis. If the building is not repaired, settlement reverts to ACV and the number drops.
2. Compute the contents settlement, handle the leased CNC machine, and state the total payable for the occurrence.
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Contents test:
- Required: 80% × $600,000 = $480,000
- Carried: $400,000 → ratio = $400,000 ÷ $480,000 = 0.8333
- Loss at replacement cost: $150,000 × 0.8333 = $125,000 (well under the $400,000 limit)
Leased CNC machine: personal property of others in the insured's care, custody, or control is within the business personal property coverage grant, so the $30,000 machine is inside the $150,000 loss figure and is subject to the same coinsurance calculation. It is not separately scheduled and does not get its own limit. The shop is contractually responsible for it, so the payment to the shop covers its obligation to the vendor.
Total for the occurrence:
| Component | Amount |
|---|---|
| Building | $225,000 |
| Contents | $125,000 |
| Subtotal | $350,000 |
| Less deductible (once per occurrence) | ($5,000) |
| Net payable | $345,000 |
Only one deductible applies; do not deduct separately for the building and the contents. The insured's uninsured gap is roughly $105,000 (replacement cost loss of $450,000 versus $345,000 paid).
3. The owner argues that coinsurance cannot apply because the loss is small relative to his limits. Respond, and recommend how to restructure the program at renewal.
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Why the argument fails: coinsurance is not a test of the loss versus the limit; it is a test of the limit versus the value of the whole risk at the time of loss. A $1,200,000 building limit against a $2,000,000 replacement cost fails the 80% test no matter how small the loss is. He effectively self-insured 25% of every dollar of loss. The only ways to avoid the penalty are to carry at least $1,600,000 or to buy a form or endorsement that suspends the requirement.
Restructuring options for renewal:
- Increase limits to 80% of current replacement cost - building to at least $1,600,000 (preferably with an inflation guard) and contents to at least $480,000. Note the 2019 values were understated even then; a current appraisal is the starting point.
- Agreed value option - suspends the coinsurance condition for the policy period provided the insured submits a signed statement of values each year. This shifts valuation risk to the underwriter and is the cleanest fix if the insured will not tolerate annual revaluation.
- Blanket or margin clause - a blanket limit across locations offers flexibility, but a margin clause can cap recovery at a stated percentage of reported values, so read it before recommending it.
- Reported value / monthly reporting form for fluctuating inventory - the reporting form carries its own deposit-and-penalty structure, so it is not a free pass.
Also flag: the business income limit and its coinsurance basis were set from the same stale 2019 figures. If the shop uses this loss as the only correction, the next tornado will hit a business income limit that has the same defect.