First-Party vs. Third-Party Claims

The phrase first-party vs. third-party describes the two fundamental directions an insurance claim can run. A first-party claim is made by the insured to its own carrier for the insured's own loss — for example, a fire that destroys your building or a theft of your inventory. A third-party claim is made by someone outside the policy (a customer, vendor, or member of the public) alleging the insured caused them harm; the insured's liability policy then responds to defend and, if warranted, pay the outside claimant. Property coverages such as business income are first-party; liability coverages such as CGL are third-party.

The difference is not academic for a small-business buyer because it changes what the insurer owes and how the claim is handled. In a first-party claim the carrier owes you indemnity for your own loss, and disputes turn on valuation and policy conditions. In a third-party claim the carrier owes a duty to defend you against the allegation — often the most valuable part of the policy, since defense costs can dwarf the eventual settlement. That defense duty is broad and is triggered by the allegations in a complaint, even ones that may ultimately prove groundless.

A practical nuance: the two categories carry different bad-faith exposure and different remedies. Because a first-party insurer is dealing directly with its own policyholder, unreasonable delay or denial can expose it to a bad faith claim by that insured. In third-party matters the carrier controls settlement, so it may issue a reservation of rights while it investigates coverage. Knowing which hat you are wearing — victim seeking indemnity, or defendant seeking a defense — tells you what to demand from your carrier and how hard to push. Some policies, like commercial auto, bundle both first-party and third-party coverages in one contract.