How Casualty Insurance Contracts Work

Core Legal Elements of an Insurance Contract

Every legally binding insurance contract rests on four essential elements: agreement, consideration, competent parties, and legal purpose. If an element is missing or defective, the contract may be void, voidable, or unenforceable, depending on the defect and state law. Insurance policies must follow these fundamental principles of general contract law before any coverage can take effect.

Agreement consists of an offer made by one party and an acceptance made by another. In casualty insurance, an applicant typically makes the offer by submitting an application, often accompanied by the initial premium or an agreement to pay it. An application submitted without an initial premium can still serve as an offer. Whether coverage begins depends on the insurer's acceptance, any binder issued by an authorized representative, and the applicable terms. If an insurer offers materially different terms from those requested, the offer may be a counteroffer; a premium change under terms already agreed to is not necessarily a counteroffer. The applicant must accept a counteroffer for coverage on its revised terms, but coverage may already be in effect under a binder or other accepted terms.

Consideration is the value exchanged between the parties to make the contract legally binding. An insurance contract cannot exist without valid consideration from both parties. The applicant's consideration generally includes the statements made in the application and the payment or promise of the required premium. The insurer's consideration is its promise to provide coverage according to the policy terms, which in liability policies may also include a promise to defend covered claims.

Competent parties are individuals or legal entities with the capacity to enter into an agreement. Minors may have limited contractual capacity, and intoxication or a mental condition may affect capacity if the person cannot understand the transaction, subject to state law. State law determines when a person has legal capacity to enter an insurance contract and whether an exception applies to a minor. Depending on the person's circumstances and state law, a contract made without legal capacity may be void or voidable. Finally, legal purpose requires the object and terms of the contract to comply with public policy and the law. A contract insuring an unlawful interest may be unenforceable. Liability policies generally exclude injury or damage expected or intended by the insured, though an insured's illegal act does not automatically void the entire policy.