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📄 '''ISO policy form''' is a standardized insurance policy template developed and filed by the Insurance Services Office (ISO), now a unit of [[Definition:Verisk | Verisk Analytics]], for use by [[Definition:Insurance carrier | insurance carriers]] across the United States. ISO forms provide the foundational policy language for many of the most widely written commercial and personal lines products — including [[Definition:Commercial general liability (CGL) | commercial general liability]], [[Definition:Business owners policy (BOP) | business owners policies]], [[Definition:Homeowners insurance | homeowners]], [[Definition:Commercial property insurance | commercial property]], [[Definition:Commercial auto insurance | commercial auto]], and [[Definition:Inland marine insurance | inland marine]] coverages. By offering a common baseline of terms, conditions, definitions, and exclusions, ISO forms bring a degree of uniformity to the U.S. insurance market that facilitates comparability, regulatory efficiency, and legal predictability.

⚙️ ISO develops its forms through an advisory process that considers industry loss experience, legal developments, emerging risks, and regulatory requirements. Once a form is drafted, ISO files it with state insurance departments — in most states, as an advisory filing that individual carriers may adopt, modify, or use as a departure point for proprietary wordings. Carriers that adopt ISO forms benefit from policy language that has been extensively litigated and interpreted by courts, reducing ambiguity and providing a body of case law that guides [[Definition:Claims management | claims handling]] and coverage determinations. ISO periodically revises its forms to address market changes: notable updates have included the introduction of pollution exclusions, the evolution of [[Definition:Cyber insurance | cyber]] and data breach exclusions, and modifications to terrorism-related language following the September 11 attacks and the passage of the [[Definition:Terrorism Risk Insurance Act (TRIA) | Terrorism Risk Insurance Act]]. Each form carries a standardized edition date (e.g., CG 00 01 04 13 for the CGL occurrence form), allowing market participants to identify precisely which version governs a given policy.

🔎 The practical significance of ISO policy forms radiates across the insurance value chain. [[Definition:Underwriting | Underwriters]] and [[Definition:Broker | brokers]] negotiate coverage by referencing ISO form numbers and edition dates as a common shorthand, and many [[Definition:Excess and surplus lines | excess and surplus lines]] and specialty policies are drafted "manuscript" — meaning custom-written — with explicit reference to how they differ from the comparable ISO standard. For the [[Definition:Claims adjuster | claims]] community, the vast body of judicial interpretation surrounding ISO language shapes coverage opinions and settlement strategies daily. Outside the United States, ISO-style standardization is less prevalent; markets such as [[Definition:Lloyd's of London | Lloyd's]] and Continental Europe rely more heavily on market-specific wordings, model clauses from bodies like the [[Definition:International Underwriting Association (IUA) | IUA]], or bespoke manuscript policies. Nevertheless, ISO's influence extends internationally through U.S.-domiciled multinational programs and the global familiarity of insurance professionals with ISO form structures as a reference framework.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Verisk]]
* [[Definition:Commercial general liability (CGL)]]
* [[Definition:Policy wording]]
* [[Definition:Manuscript policy]]
* [[Definition:Advisory organization]]
* [[Definition:Homeowners insurance]]
{{Div col end}}

Definition:ISO policy form - Revision history

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