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🛡️ '''Defence cost''' refers to the legal fees, investigation expenses, and related charges an [[Definition:Insurance carrier | insurer]] or [[Definition:Insured | insured]] incurs in responding to, investigating, and defending against a [[Definition:Claim | claim]] covered under a [[Definition:Liability insurance | liability insurance]] policy. In lines such as [[Definition:Directors and officers insurance (D&O) | directors and officers]], [[Definition:Professional indemnity insurance | professional indemnity]], [[Definition:Errors and omissions insurance (E&O) | errors and omissions]], [[Definition:Medical malpractice insurance | medical malpractice]], and [[Definition:General liability insurance | general liability]], defence costs can rival or even exceed the indemnity payment itself, making the treatment of these expenses a critical feature of policy design. Jurisdictions differ in terminology — U.S. practitioners often say "defense costs" or "allocated loss adjustment expenses," while UK and London market wordings typically use "defence costs" or "costs and expenses" — but the underlying concept is consistent: these are the amounts spent contesting or managing a claim on behalf of the insured.

⚙️ How defence costs interact with the [[Definition:Policy limit | policy limit]] depends on the specific wording of the insurance contract. Under an "inclusive" or "eroding" limit structure — common in [[Definition:D&O insurance | D&O]] and many [[Definition:Professional liability insurance | professional liability]] forms — every dollar spent on defence reduces the aggregate limit available for [[Definition:Indemnity | indemnity]] payments, meaning protracted litigation can exhaust coverage before a settlement or judgment is reached. By contrast, policies written on a "defence costs in addition" basis provide a separate allocation for legal expenses on top of the indemnity limit, offering the insured substantially broader protection. Some [[Definition:Excess insurance | excess]] and [[Definition:Umbrella insurance | umbrella]] layers attach only after both indemnity and defence costs in underlying policies have been consumed, adding further complexity. In the [[Definition:Lloyd's of London | Lloyd's]] market and across international specialty lines, detailed schedules often cap specific categories of expense — such as forensic accounting or public relations advisory fees — and impose insurer consent requirements before costs are incurred.

💡 Getting defence cost provisions right has outsized consequences for both [[Definition:Underwriting | underwriting]] profitability and policyholder satisfaction. From the carrier's perspective, defence costs feed directly into [[Definition:Loss adjustment expense (LAE) | loss adjustment expense]] ratios and, in aggregate, into [[Definition:Combined ratio | combined ratio]] performance; an unexpected surge in litigation activity across a [[Definition:Book of business | book of business]] can materially impair results even before indemnity payments rise. For the insured, the distinction between eroding and non-eroding limits may determine whether adequate coverage remains after a lengthy legal battle. [[Definition:Reinsurance | Reinsurance]] treaties often specify how defence costs are allocated between [[Definition:Cedent | cedent]] and [[Definition:Reinsurer | reinsurer]], and misalignment in these definitions has been a recurring source of coverage disputes. Regulatory regimes in markets such as the United States, Australia, and the European Union increasingly scrutinize the clarity with which defence cost terms are disclosed to policyholders, reinforcing the importance of precise drafting.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss adjustment expense (LAE)]]
* [[Definition:Policy limit]]
* [[Definition:Liability insurance]]
* [[Definition:Duty to defend]]
* [[Definition:Allocated loss adjustment expense (ALAE)]]
* [[Definition:Indemnity]]
{{Div col end}}

Definition:Defence cost - Revision history

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