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⚖️ '''Proportionate liability''' is a legal and contractual principle under which each party to an insurance or [[Definition:Reinsurance | reinsurance]] arrangement bears responsibility only for its own share of a [[Definition:Loss | loss]] or obligation, rather than being held responsible for the full amount if another party fails to pay. Within insurance markets, this concept arises most prominently in [[Definition:Subscription market | subscription]] and [[Definition:Co-insurance | co-insurance]] placements — common at [[Definition:Lloyd's | Lloyd's]] of London and in large commercial programmes worldwide — where multiple [[Definition:Underwriter | underwriters]] each take a defined percentage [[Definition:Line | line]] on a single risk.

🔍 Under a proportionate liability structure, if an insurer writing a 20% line on a commercial [[Definition:Property insurance | property]] placement becomes [[Definition:Insolvency | insolvent]], the remaining insurers on the slip are not obligated to cover that shortfall; the [[Definition:Policyholder | policyholder]] bears the gap unless other mechanisms — such as [[Definition:Guarantee fund | guarantee funds]] or separate [[Definition:Credit insurance | credit insurance]] on the panel — fill it. This differs fundamentally from [[Definition:Joint and several liability | joint and several liability]], where any one party can be compelled to pay the entire claim and must then seek contribution from co-obligors. Lloyd's market wordings, for example, have historically operated on a several (proportionate) basis, with each [[Definition:Lloyd's syndicate | syndicate's]] liability capped at its subscribed percentage. The same principle extends into [[Definition:Reinsurance | reinsurance]]: under most [[Definition:Quota share | quota-share]] treaties, each reinsurer's obligation is limited to its ceded share, and a [[Definition:Cedent | cedent]] cannot demand that one reinsurer compensate for another's default. In civil-law jurisdictions across Continental Europe and parts of Asia, the legal treatment of proportionate versus solidary (joint) liability varies, and policy wordings must be carefully drafted to confirm which regime applies.

💼 The practical significance for buyers of insurance is that proportionate liability shifts [[Definition:Counterparty risk | counterparty credit risk]] onto the insured. A [[Definition:Risk manager | risk manager]] assembling a programme with ten participating carriers must consider the [[Definition:Financial strength rating | financial strength]] of every panel member, because each one's failure creates a direct coverage gap. This dynamic makes [[Definition:Insurance broker | brokers']] role in panel selection critically important and has driven the use of [[Definition:Security vetting | security vetting]] processes, minimum [[Definition:Credit rating | credit-rating]] thresholds, and diversified panel construction. From the insurer's perspective, proportionate liability is a structural safeguard: it ensures that writing a minority line on a large risk will never expose the carrier to obligations beyond its agreed share, making it easier to participate in very large placements without concentration concerns.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Joint and several liability]]
* [[Definition:Co-insurance]]
* [[Definition:Subscription market]]
* [[Definition:Counterparty risk]]
* [[Definition:Several liability clause]]
* [[Definition:Lloyd's syndicate]]
{{Div col end}}

Definition:Proportionate liability - Revision history

PlumBot: Bot: Creating new article from JSON