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⚖️ '''Defence costs''' are the legal fees, expert witness expenses, court charges, and other expenditures an [[Definition:Insurer | insurer]] incurs — or agrees to reimburse — in defending a [[Definition:Policyholder | policyholder]] against a covered [[Definition:Claim | claim]]. They are a central element of [[Definition:Liability insurance | liability insurance]] lines, including [[Definition:Professional indemnity insurance | professional indemnity]], [[Definition:Directors and officers liability insurance (D&O) | directors and officers]], [[Definition:Employers' liability insurance | employers' liability]], and [[Definition:General liability insurance | general liability]] policies. Whether a policy refers to them as "defence costs," "defense costs," or "costs and expenses" depends on the jurisdiction and policy form, but the underlying concept is consistent: the insurer's obligation extends beyond paying damages to also funding the legal effort required to contest or settle allegations against the insured.

💼 How defence costs interact with the policy's [[Definition:Limit of liability | limit of liability]] is one of the most consequential structural features in any liability programme. Under some policies — particularly those common in the United States general liability market — defence costs sit outside the policy limit, meaning the insurer pays them in addition to any damages award, a structure often described as "costs in addition." Under other forms, especially many [[Definition:Professional indemnity insurance | professional indemnity]] and [[Definition:Directors and officers liability insurance (D&O) | D&O]] policies written in the London, European, and Asian markets, defence costs erode the policy limit, reducing the amount available to pay the underlying claim. This "costs inclusive" approach means that a protracted legal defence can exhaust coverage before a judgment or settlement is even reached. [[Definition:Reinsurance | Reinsurance]] treaties must also specify how defence costs are allocated, as the treatment can materially affect [[Definition:Loss ratio | loss ratios]] and reserve estimates.

🔑 The allocation and management of defence costs carry significant financial and strategic implications. For policyholders, understanding whether defence costs reduce available limits is essential when structuring coverage towers and deciding whether to purchase additional [[Definition:Excess insurance | excess]] layers. For insurers, defence cost exposure can be substantial — in complex litigation such as mass tort or securities class actions, legal fees may rival or exceed the damages themselves. Effective claims management often involves appointing approved [[Definition:Panel counsel | panel counsel]], negotiating fee arrangements, and implementing litigation management guidelines to control costs without compromising the quality of the defence. Regulators in several jurisdictions also pay attention to how insurers account for defence cost reserves, particularly under [[Definition:IFRS 17 | IFRS 17]] and [[Definition:US GAAP | US GAAP]] standards, where the timing and estimation of these obligations affect reported liabilities.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Limit of liability]]
* [[Definition:Liability insurance]]
* [[Definition:Duty to defend]]
* [[Definition:Erosion of limits]]
* [[Definition:Professional indemnity insurance]]
* [[Definition:Directors and officers liability insurance (D&O)]]
{{Div col end}}

Definition:Defence costs - Revision history

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