Most professional liability and errors-and-omissions (E&O) policies are written on a claims-made basis. Understanding that one word explains why tail coverage exists and why it matters so much.
How claims-made works
A claims-made policy only responds to a claim if that claim is both:
- made (reported) while the policy is in force, and
- arising from a wrongful act that occurred on or after the policy's retroactive date.
The catch: once a claims-made policy ends, it generally won't respond to a claim reported after the expiration date — even if the underlying mistake happened while you were covered. Professional liability claims often surface months or years after the work was done, so this creates a dangerous gap.
What the Extended Reporting Period does
An Extended Reporting Period (ERP), commonly called tail coverage, extends the window to report claims after the policy ends, for incidents that occurred during the policy period (back to the retroactive date). It does not cover new work done after the policy ends — it simply preserves your ability to report covered past acts.
When it's essential
- Retiring or leaving the profession
- Switching carriers (if the new policy doesn't pick up your prior retroactive date)
- Closing or selling a business
- Any time a claims-made policy is not being renewed
A short tail is sometimes built in automatically, but meaningful protection usually requires purchasing an ERP — often one, three, or more years, or an unlimited tail. Letting a claims-made policy lapse without a tail can leave a professional personally exposed to claims from work they did while insured.
Educational only — confirm against the actual policy and your carrier's guidelines.