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🛡️ '''Defense obligation''' is the contractual and, in many jurisdictions, statutory duty imposed on a [[Definition:Liability insurance | liability insurer]] to provide a legal defense for its [[Definition:Insured | insured]] when a [[Definition:Claim | claim]] or [[Definition:Lawsuit | lawsuit]] alleges facts that potentially fall within the scope of [[Definition:Coverage | coverage]]. This obligation is broader than the [[Definition:Duty to indemnify | duty to indemnify]]: under the widely followed "four corners" or "eight corners" rule, an insurer must defend the entire action if even one allegation in the [[Definition:Complaint | complaint]], compared against the [[Definition:Insurance policy | policy]] terms, could conceivably trigger coverage — regardless of whether the claim ultimately proves to be covered.

📝 Once a defense obligation is triggered, the insurer typically retains and pays [[Definition:Panel counsel | panel counsel]] to represent the insured, subject to the carrier's [[Definition:Litigation management guidelines | litigation management guidelines]]. If a conflict of interest arises — for instance, when the complaint contains both covered and uncovered allegations — the insured may be entitled to select [[Definition:Independent counsel | independent counsel]] at the insurer's expense, a right codified in some states by statute (California's Cumis rule being the most prominent example). The insurer may simultaneously issue a [[Definition:Reservation of rights | reservation of rights]] letter or pursue a [[Definition:Declaratory judgment | declaratory judgment]] to resolve the coverage question without abandoning its defense obligation in the interim. Failure to defend when required can expose the insurer to liability for the full judgment, [[Definition:Bad faith | bad faith]] damages, and [[Definition:Estoppel | estoppel]] arguments that foreclose coverage defenses entirely.

⚠️ The practical and financial stakes surrounding the defense obligation make it one of the most litigated issues in insurance law. Disputes frequently arise over whether new or amended allegations revive or extinguish the obligation, whether [[Definition:Policy exclusion | exclusions]] are sufficiently clear to eliminate any potential for coverage, and how the obligation interacts with [[Definition:Other insurance | other insurance]] clauses when multiple policies may apply. For carriers, the defense obligation drives substantial [[Definition:Defense costs | defense cost]] exposure and shapes [[Definition:Loss reserve | reserve]] setting from the moment a suit is tendered. For policyholders, understanding the scope and limitations of their insurer's defense obligation is essential to ensuring they receive the protection they purchased.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Duty to defend]]
* [[Definition:Duty to indemnify]]
* [[Definition:Reservation of rights]]
* [[Definition:Declaratory judgment]]
* [[Definition:Bad faith]]
* [[Definition:Independent counsel]]
{{Div col end}}

Definition:Defense obligation - Revision history

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