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⚠️ '''Material change''' in insurance refers to any alteration in the circumstances or characteristics of a risk that is significant enough to influence an [[Definition:Underwriter | underwriter's]] decision to accept, price, or continue providing coverage. The principle is rooted in the [[Definition:Duty of disclosure | duty of disclosure]] — sometimes called the duty of utmost good faith or ''[[Definition:Uberrima fides | uberrimae fidei]]'' — which requires the [[Definition:Policyholder | insured]] to inform the insurer of facts material to the risk, not only at inception but throughout the policy period. What qualifies as "material" varies by jurisdiction: English law historically applied a "prudent underwriter" test, while many U.S. states focus on whether the change would have led to different policy terms, and civil-law systems in Continental Europe and Asia often codify the obligation in insurance contract statutes.

🔄 In practice, material changes encompass a wide spectrum. For a [[Definition:Property insurance | property]] risk, a material change might include a shift in building occupancy from office to manufacturing, the removal of a [[Definition:Sprinkler system | sprinkler system]], or the commencement of construction work on the premises. In [[Definition:Liability insurance | liability]] lines, it could involve a fundamental change in the insured's business activities or a significant acquisition. [[Definition:Marine insurance | Marine]] policies may be affected by a change in trade route or vessel classification. Policy wordings typically include a "material change" or "alteration" clause requiring the insured to notify the insurer of such changes, often before they take effect. Upon notification, the insurer may adjust the [[Definition:Premium | premium]], impose additional [[Definition:Conditions | conditions]], or — in severe cases — exercise its right to cancel the policy. Failure to disclose a material change can void coverage entirely or entitle the insurer to avoid the [[Definition:Claims | claim]].

📌 Getting the materiality assessment right matters enormously at the point of [[Definition:Claims | claims]] adjudication. Disputes over whether an undisclosed change was truly "material" are among the most frequently litigated issues in insurance law worldwide. Recent legislative reforms in several markets have sought to balance insurer and policyholder interests: the UK's [[Definition:Insurance Act 2015 | Insurance Act 2015]], for example, replaced the blunt remedy of avoidance with a proportionate remedies regime, while Australia's Insurance Contracts Act takes a similarly consumer-protective approach. For underwriters, clear policy language defining notification obligations and examples of material changes reduces ambiguity. For [[Definition:Broker | brokers]], advising clients to report changes proactively is a fundamental risk management duty — one that protects the client's coverage and the broker's own professional liability exposure.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Duty of disclosure]]
* [[Definition:Uberrima fides]]
* [[Definition:Insurance Act 2015]]
* [[Definition:Misrepresentation]]
* [[Definition:Policy condition]]
* [[Definition:Warranty (insurance)]]
{{Div col end}}

Definition:Material change - Revision history

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