Getting sued can feel expensive before the case even starts. The complaint arrives, deadlines begin running, and legal fees can start piling up fast. In many situations, though, a liability insurer may owe more than just money toward a settlement or judgment. It may also owe a defense.
That obligation is commonly called the duty to defend. In simple terms, it refers to an insurer’s contractual obligation to provide and fund a legal defense when a lawsuit potentially falls within policy coverage. In many jurisdictions, that duty is broader than the duty to ultimately pay a judgment, and it can be triggered by the allegations in the complaint even when coverage is still disputed. Sources like the American Bar Association, IRMI, and the American Law Institute all describe the duty to defend as a central feature of liability insurance and note that the governing rules vary by state.
If you are trying to get an insurer to pay for the defense of a lawsuit, the process often turns on policy language, timing, the allegations in the complaint, and state-specific law. In this post you’ll learn what the duty to defend is, when it may be triggered, what “tendering” a claim means, what happens if the insurer sends a reservation-of-rights letter, and what options may exist if the insurer refuses to defend.
If you want a broader foundation before diving in, it may help to start with this deeper overview of how defense obligations, complaint allegations, and tender strategy fit together.
<aside> 💡 Scroll to the bottom for every post in this series.
</aside>
In general terms, the duty to defend is the insurer’s obligation under a liability policy to provide a legal defense against claims that are potentially covered. That “potential for coverage” concept matters. According to the ABA, most jurisdictions follow a general rule that the duty to defend arises whenever a claim triggers the potential for coverage under the policy. The ABA’s insurance coverage materials also explain that if any part of the underlying claim could result in covered liability, the insurer is often obligated to provide a defense, sometimes under a reservation of rights.
That is one reason policyholders are often surprised to learn that a case can be defensible under the policy even if the insurer has not yet agreed that it will eventually pay a settlement or judgment. The duty to defend and the duty to indemnify are related, but they are not the same thing.
Because in many states, the insurer’s defense obligation is triggered by possibility, not certainty. Courts and commentators frequently describe the duty to defend as broader than the duty to indemnify for exactly that reason. The IRMI discussion of the “four corners” rule explains that in many jurisdictions courts compare the complaint to the policy and resolve doubt in favor of a defense. The ALI’s Restatement of the Law, Liability Insurance also highlights the importance of the rules governing when an insurer’s duty to defend is triggered.
For a beginner, the takeaway is straightforward: if the complaint leaves room for covered liability, the insurer may owe a defense even when the facts are still being sorted out.
The duty to defend usually shows up in liability insurance, not first-party property coverage. Common examples include: