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📋 '''ISO form''' is a standardized insurance policy form or endorsement developed by the [[Definition:Insurance Services Office (ISO) | Insurance Services Office (ISO)]], now part of Verisk, that serves as the baseline wording used by a majority of [[Definition:Property insurance | property]] and [[Definition:Casualty insurance | casualty]] insurers in the United States. These forms provide uniform policy language for lines ranging from [[Definition:Commercial general liability (CGL) | commercial general liability]] and [[Definition:Commercial property insurance | commercial property]] to [[Definition:Homeowners insurance | homeowners]] and [[Definition:Business auto insurance | business auto]], creating a common framework that facilitates regulatory approval, market consistency, and judicial interpretation of coverage.

🔧 ISO develops and periodically revises its forms through a committee process that includes input from insurers, regulators, and industry stakeholders. Once an ISO form edition is filed and approved by state [[Definition:Department of insurance | departments of insurance]], carriers can adopt it as-is, modify it with proprietary endorsements, or use it as a starting point for manuscript policies. Because courts across the country have interpreted ISO language in thousands of decisions, a rich body of case law exists around key provisions — such as the "occurrence" definition in the CGL form or the "special form" causes-of-loss wording in commercial property — giving [[Definition:Underwriter | underwriters]], [[Definition:Claims adjuster | claims adjusters]], and coverage attorneys a relatively predictable framework for evaluating disputes. Carriers that deviate from ISO language must be aware that unfamiliar wording may face stricter [[Definition:Ambiguity | ambiguity]] scrutiny under the [[Definition:Contra proferentem | contra proferentem]] doctrine.

💡 Standardization through ISO forms has been a quiet cornerstone of the American insurance market's efficiency. It enables [[Definition:Reinsurer | reinsurers]] to evaluate the coverage provided by hundreds of primary carriers without reading hundreds of unique policy manuscripts. It allows [[Definition:Managing general agent (MGA) | MGAs]] and [[Definition:Wholesale broker | wholesale brokers]] to communicate coverage scope quickly. And it gives [[Definition:Insurtech | insurtech]] companies building digital quoting and binding platforms a consistent data structure to map coverage elements. At the same time, the rise of emerging risks — [[Definition:Cyber insurance | cyber liability]], [[Definition:Parametric insurance | parametric triggers]], [[Definition:Embedded insurance | embedded products]] — has exposed the limits of traditional ISO forms, pushing the market toward more bespoke and modular policy designs that ISO continues to develop alongside.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Insurance Services Office (ISO)]]
* [[Definition:Commercial general liability (CGL)]]
* [[Definition:Policy form]]
* [[Definition:Endorsement]]
* [[Definition:Manuscript policy]]
* [[Definition:Advisory organization]]
{{Div col end}}

Definition:ISO form - Revision history

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