Coinsurance Formula – What You Need To Know!
The coinsurance formula is a way of calculating how much an insurer will pay on a claim based on the amount of coverage purchased by the insured, as well as defined coverage requirements.
In plain language: Think of it like this – if you choose to only cover part of the value of your property, the insurance company will only cover part of the damage if something happens. The coinsurance formula helps decide how much they'll pay.
Technical definition: The coinsurance formula is a calculation used in insurance to determine the amount an insurer will pay on a claim. It is most commonly associated with property insurance policies and is often found in the conditions or declarations pages. The principle behind this formula is that the insured shares the risk with the insurance company to a certain extent.
Imagine working hard to build a thriving business, then one day disaster strikes. A fire destroys part of your commercial property, but you discover you're underinsured when you file a claim. This can result in a coinsurance penalty.
TL;DR
What Is Coinsurance Formula in Insurance?
The coinsurance formula, often part of a coinsurance clause, relates to property insurance, such as homeowners or commercial property insurance. It sets a minimum percentage, typically 80%, 90%, or 100%, of the property's value, that a property owner must insure. If the coverage doesn't meet this, a coinsurance penalty is applied, reducing claim payments.
This formula is generally written as follows: (Amount of Insurance Carried / Amount of Insurance Required) x Loss = Claim Payment. It appears in policy conditions or the declarations page and it is associated with ISO-form property insurance policies.
The key point here is the requirement to maintain insurance coverage to a certain minimum percentage of the actual value of the property. Failure to do this leads to the insurance company reducing claim payments proportionately.
Key Related Terms to Know
Common Questions About Coinsurance Formula
What is the difference between coinsurance and deductible?
A deductible is the amount a policyholder must pay out-of-pocket before insurance coverage kicks in. Coinsurance, on the other hand, is a cost-sharing agreement between the policyholder and insurer, generally applying after the deductible is met. The coinsurance formula comes into play if the insured has purchased less than the required coverage amount for their property, leading to reduced claim payments.
How does coinsurance affect my claim payment?
If you are not carrying the required amount of insurance (typically 80%, 90% or 100% of your property's value), the coinsurance formula is used to adjust your claim payment downwards, this is coinsurance penalty. For example, if your building is worth $1 million, and you are supposed to carry 90% coverage (i.e $900,000), but you only carry $800,000, any claim payment will be reduced proportionately.
How can I avoid the coinsurance penalty?
The best way to avoid a coinsurance penalty is to make sure you purchase enough insurance to meet the coinsurance requirement in your policy, typically 80%, 90% or 100% of your property's value.
What if I disagree with the insurance company's valuation of my property?
Insurance companies typically use professional appraisals to determine property values. If you think that your property has been undervalued, you can consider bringing in your own appraiser for a second opinion.
Coinsurance Formula vs. Agreed Value
Comparison Area | Coinsurance Formula | Agreed Value
|
Primary Use Case | Determines the amount an insurer will pay on a claim based on coverage purchased and declared property value. | Sets a pre-agreed upon value of insured property, eliminates coinsurance. |
Coverage / Concept Type | Cost-sharing mechanism. | Alternative valuation method. |
Typical Exclusions | Does not apply if the insured carries enough coverage to meet coinsurance requirement. | Does not apply to all types of properties. |
Who is Most Affected by Errors | Policyholders who do not carry sufficient insurance. | Policyholders with unique or hard to value properties. |
Common Mistakes | Underestimating property value and insurance need. | Failing to regularly reassess and adjust the agreed value as required. |
Real Claim Examples Involving Coinsurance Formula
Scenario 1: A business owner suffers a $500,000 loss but only carried $600,000 in coverage for a property valued at $1 million. Based on a common 80% coinsurance clause, they would face a coinsurance penalty as they were underinsured by $200,000.
Scenario 2: A homeowner incurs $100,000 worth of damage from a storm. Their home's replacement cost is $500,000 and their insurance coverage is set at $300,000. As they didn't meet the 80% coinsurance requirement ($400,000), their claim benefits were reduced proportionately.
Scenario 3: A company's warehouse has a replacement cost of $10 million, and they chose to cover it for $7 million. After a fire caused $2 million damage, their claim payout was reduced due to the coinsurance penalty.
Limitations and Common Mistakes
How to Explain Coinsurance Formula to Clients
To a homeowner: "Think of it as if you promised to cover 80% of your home's cost, but only cover 70%. If you have a claim, the insurance company will only cover 70% of the damage. It's really important you have the right amount of coverage."
To a small business owner: "The coinsurance formula is used if your property isn't fully insured when you file a claim. For instance, if you insure only $800k of a $1 million property, all claim amounts get reduced in proportion to that amount."
To a CFO or Risk Manager: "Coinsurance is about risk-sharing. Essentially, you're agreeing to insure a certain percentage of your property's value. If you don't hold up your end (say, carry only 75% coverage), any claim settlements will be reduced likewise."