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.

Where this term matters

Business Insurance →/business/professional-liability →

Tip

Glossary definitions are educational. Always check your own policy language — insurers can define common terms differently from one another. When in doubt, request a written explanation from your agent.

Related terms

Claims-Made PolicyClaims-made policies tie coverage to when a claim is reported rather than when the incident happened, making continuous coverage and retroactive dates critically important.Retroactive DateThe retroactive date on a claims-made policy defines how far back in time covered incidents can originate — incidents before this date are excluded.Prior Acts CoveragePrior acts (nose) coverage sets the retroactive date on a new claims-made policy to match the old insurer's retroactive date, covering incidents from before the new policy started.Professional Liability InsuranceProfessional liability insurance, sometimes called E&O, protects consultants, attorneys, accountants, and other professionals from negligence claims tied to the services they provide.
Source: Cover Forge USA editorial team|Last verified: May 2026|Methodology
Definitions are educational and may be simplified. Always refer to your policy contract and consult a licensed agent for terms that affect coverage decisions.
CF

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 June 2026

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