Definition:Reported basis
📋 Reported basis describes an approach to measuring claims or losses in which only those claims that have been formally reported to the insurer by a given evaluation date are included in the analysis. This stands in contrast to an ultimate basis, which also incorporates estimates for losses that have occurred but have not yet been reported (IBNR). The distinction is fundamental across the global insurance industry — whether one is examining a loss ratio, a reserve schedule, or a reinsurance treaty exhibit.
🔎 When data is presented on a reported basis, it reflects the insurer's recorded case reserves and paid amounts for claims that have entered the system, without layering on the actuarial projections needed to capture late-emerging losses. In long-tail lines such as liability or workers' compensation, the gap between reported and ultimate figures can be substantial, especially in the early development years of a given accident year. Reinsurers frequently request reported-basis data when evaluating cedants' submissions, since it offers a raw, unfiltered view of development patterns that can then be independently projected. Bordereaux reports exchanged between cedants and reinsurers, or between MGAs and capacity providers, are typically compiled on a reported basis.
⚠️ Understanding whether a figure is stated on a reported or ultimate basis is essential for avoiding analytical errors. A reported-basis loss ratio for a recently underwritten accident year may appear deceptively favorable simply because many claims have not yet surfaced — a phenomenon particularly pronounced in classes with long reporting lags, such as professional liability or latent disease coverages. Financial reporting standards across jurisdictions — whether US GAAP, IFRS 17, or local statutory frameworks — generally require insurers to book reserves on an ultimate basis for balance sheet purposes, but reported-basis exhibits remain indispensable for loss development analysis, triangulation, and pricing reviews.
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