Business Insurance
Tail Coverage (Extended Reporting Period)
Tail coverage — formally called an Extended Reporting Period (ERP) — is essential when a claims-made policy is canceled or not renewed, protecting against late-emerging claims.
Last reviewed: May 2026 · Editorial methodology
Definition
Tail coverage, or an Extended Reporting Period (ERP), is an endorsement or separately purchased policy that extends the window for reporting claims after a claims-made policy ends. It is critical when a business changes insurers, retires, or dissolves, because claims-made policies provide no protection for incidents reported after policy termination unless an ERP is in place. Tail coverage does not extend the policy period itself — it only extends the time to report claims arising from incidents that occurred while the original policy was active. Standard tails are offered in durations of 1, 2, 3, or 5 years; a few insurers offer unlimited (infinite) tails, which are especially valuable for physicians and attorneys facing long statute-of-limitations periods. The cost of a tail is typically 100–250% of the annual premium for a full extended tail, making it a significant but necessary expense. Some policies include a mini-tail — often 30–60 days — automatically upon cancellation, but this is rarely sufficient for professional liability exposures with multi-year statutes of limitations.
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Cover Forge USA Editorial Team
Editorial Lead
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed 2026-06-14
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