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⚖️ '''English rule (costs)''' is the legal principle under which the losing party in litigation is required to pay the winning party's reasonable legal costs, including attorney's fees. In the insurance industry, this rule — also known as the "loser pays" principle — profoundly influences [[Definition:Claims | claims]] strategy, [[Definition:Litigation management | litigation management]], and [[Definition:Loss reserving | reserve setting]] for [[Definition:Liability insurance | liability insurers]] operating in jurisdictions that follow it. The United Kingdom, most of Continental Europe, Australia, Canada, and many Asian jurisdictions apply some form of the English rule, while the United States generally follows the contrasting "American rule," under which each party bears its own legal costs regardless of outcome.

🔍 For [[Definition:Insurance carrier | insurers]], the distinction between cost regimes shapes virtually every aspect of [[Definition:Claims management | claims handling]] and [[Definition:Defense costs | defense cost]] budgeting. In English-rule jurisdictions, a [[Definition:Liability insurer | liability insurer]] defending a [[Definition:Policyholder | policyholder]] faces a dual financial exposure: the potential [[Definition:Indemnity | indemnity]] payment if the claim succeeds, plus the obligation to reimburse the claimant's legal costs. Conversely, if the defense prevails, the insurer may recover a substantial portion of its own costs from the unsuccessful claimant — a dynamic that can incentivize vigorous defense of meritless claims. This cost-shifting mechanism tends to discourage speculative or weak litigation, which affects [[Definition:Claims frequency | claims frequency]] patterns and the types of cases that proceed to trial versus settlement. In practice, the rule also interacts with "qualified" or "Part 36" offer mechanisms (in England and Wales) and similar procedural tools that create cost consequences for parties who refuse reasonable settlement offers, adding another layer of strategic calculation to [[Definition:Claims | claims]] negotiations.

📋 The rule's broader impact on the insurance market is significant. In jurisdictions where it applies, [[Definition:Loss ratio | loss ratios]] for liability lines tend to reflect lower volumes of nuisance litigation but potentially higher per-claim cost exposure when adverse cost orders are entered. [[Definition:Actuary | Actuaries]] building [[Definition:Reserve | reserves]] for portfolios spanning multiple jurisdictions must account for these structural differences in litigation cost dynamics. For [[Definition:Reinsurer | reinsurers]] providing coverage across borders, understanding whether the underlying [[Definition:Primary insurance | primary]] exposure sits in an English-rule or American-rule jurisdiction is essential to pricing and structuring treaties appropriately. The distinction also matters for emerging coverage lines such as [[Definition:Cyber insurance | cyber liability]] and [[Definition:Directors and officers liability insurance (D&O) | D&O insurance]], where cross-border claims may simultaneously engage jurisdictions with different cost rules, creating complex allocation challenges for insurers managing multi-jurisdictional [[Definition:Defense costs | defense cost]] obligations.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Defense costs]]
* [[Definition:Liability insurance]]
* [[Definition:Litigation management]]
* [[Definition:Loss reserving]]
* [[Definition:Indemnity]]
* [[Definition:Claims management]]
{{Div col end}}

Definition:English rule (costs) - Revision history

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