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⚖️ '''Adverse costs''' are the legal expenses of a prevailing opposing party that a losing party may be ordered to pay following litigation or dispute resolution proceedings, a concept of particular significance in [[Definition:Liability insurance | liability insurance]] and [[Definition:Legal expenses insurance | legal expenses insurance]]. In jurisdictions that follow the "loser pays" principle — including England and Wales, most Continental European countries, Australia, and many Asian common-law jurisdictions — a court may order the unsuccessful litigant to reimburse the winning side's reasonable legal costs. This exposure is distinct from the insured's own [[Definition:Defense costs | defense costs]] and represents an additional financial burden that can materially affect the total cost of a [[Definition:Claim | claim]] for both [[Definition:Policyholder | policyholders]] and their insurers.

🔧 Within the insurance context, adverse costs most commonly arise in [[Definition:Employers' liability insurance | employers' liability]], [[Definition:Public liability insurance | public liability]], [[Definition:Professional indemnity insurance | professional indemnity]], and [[Definition:Medical malpractice insurance | medical malpractice]] lines where litigation is the primary mechanism for claim resolution. When an insurer defends a claim on behalf of its insured and loses, the policy may respond to the adverse costs award depending on the policy wording and jurisdiction. In England and Wales, the introduction of qualified one-way costs shifting in personal injury claims altered the adverse costs landscape by largely shielding claimants from paying defendants' costs, thereby concentrating the adverse costs risk on defendant insurers who lose. [[Definition:After-the-event insurance (ATE) | After-the-event (ATE) insurance]] — a product that covers a litigant's exposure to adverse costs if they lose their case — has become a significant product class in the UK and Australian markets. Notably, the United States follows the "American rule," under which each party generally bears its own legal costs regardless of outcome, making adverse costs a less prominent concern for U.S.-focused insurers, though exceptions exist in specific statutes and contractual arrangements.

🌐 The financial impact of adverse costs exposure on the insurance industry should not be underestimated in jurisdictions where the loser-pays principle applies. For [[Definition:Underwriter | underwriters]] pricing liability and professional indemnity risks, the potential for adverse costs awards must be factored into [[Definition:Reserve | reserves]] and [[Definition:Incurred but not reported (IBNR) | IBNR]] estimates alongside the underlying damages and own-side defense costs. An unexpected adverse costs award can significantly inflate the total incurred cost of a claim, particularly in complex commercial litigation where both sides engage high-cost legal teams. For [[Definition:Legal expenses insurance | legal expenses insurers]] and ATE providers, modeling adverse costs exposure is the core underwriting challenge, requiring granular analysis of case merits, likely duration, and the opponent's likely fee structure. As litigation funding and ATE insurance continue to grow as asset classes globally, accurate pricing and reserving for adverse costs has become a specialized discipline within the broader insurance market.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Defense costs]]
* [[Definition:After-the-event insurance (ATE)]]
* [[Definition:Legal expenses insurance]]
* [[Definition:Liability insurance]]
* [[Definition:Professional indemnity insurance]]
* [[Definition:Litigation funding]]
{{Div col end}}

Definition:Adverse costs - Revision history

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