Definition:Discovery basis
🔎 Discovery basis is a coverage trigger used in certain insurance policies — most commonly fidelity bonds, crime insurance, and some financial institution bonds — under which a loss is covered if it is discovered during the policy period, regardless of when the wrongful act or loss event actually occurred. This stands in contrast to an occurrence basis, where coverage attaches based on when the loss-causing event took place, and a claims-made basis, where coverage depends on when the claim is reported. Discovery-basis policies are particularly suited to exposures like employee dishonesty and fraud, where losses may accumulate undetected over extended periods before being uncovered.
⚙️ Under a discovery-basis policy, the insured must detect or become aware of the loss during the active policy period (or within a specified discovery period following policy expiration) and report it to the insurer within the timeframes stipulated in the contract. Many discovery-basis forms include a "sunset" or lookback provision specifying how far back in time covered losses may extend, though some provide unlimited retroactive coverage for losses that were genuinely unknown. The policy typically defines what constitutes "discovery" — often the moment a responsible officer or executive of the insured organization first becomes aware of facts that would cause a reasonable person to suspect a covered loss has occurred. This definition matters enormously in claims disputes, as the timing of discovery can determine whether a loss falls within the current policy or a prior or subsequent one. In the United States, where fidelity and crime coverages are widely written on a discovery basis, standard forms from ISO and the Surety & Fidelity Association of America provide well-established policy language, while in other markets the precise terms may vary.
💡 For policyholders and their brokers, understanding whether coverage operates on a discovery basis is essential when structuring a risk transfer program, particularly for financial crime and employee dishonesty exposures. One practical advantage is that discovery-basis coverage avoids the gap risk that can arise under occurrence-based forms, where a loss event that spans multiple policy years may create allocation disputes. However, a potential pitfall arises at policy transition: if an insured switches carriers or allows coverage to lapse, losses discovered after the old policy expires but relating to acts committed during its term may fall into a gap unless a discovery period extension (sometimes called a "run-off" provision) is purchased. Underwriters pricing discovery-basis coverages must account for the inherent uncertainty of latent losses, and actuaries face challenges in reserving for claims where the loss event may have originated years before the policy incepted. These dynamics make the discovery trigger a distinctive and consequential feature in the architecture of insurance contracts.
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