Occurrence vs. Claims-Made Liability Coverage
Two policies can look identical on the certificate yet respond very differently depending on when a claim is reported.
Two ways a policy can be triggered
Liability policies generally fall into one of two trigger types, and the difference is about timing: an occurrence policy keys off when the incident happened, while a claims-made policy keys off when the claim is reported.
- Occurrence. Generally intended to respond to a covered incident that took place during the policy period, even if the claim is reported years later, after the policy has ended.
- Claims-made. Generally intended to respond only if the claim is both made and reported while the policy (or its extensions) is active, and typically only for incidents after a stated retroactive date.
Where the gap can open up
The risk with a claims-made policy appears when coverage lapses or is switched. If you let a claims-made policy end and a claim is reported afterward about an incident from years ago, the expired policy generally will not respond.
This timing gap is why claims-made coverage is common in professional fields where claims surface long after the work was done, such as in professional liability insurance, also known as Errors & Omissions (E&O) insurance.
What tail coverage does
Tail coverage, sometimes called an extended reporting period, is generally intended to address that gap. It commonly allows claims to be reported after a claims-made policy ends, as long as the incident occurred during the original coverage period.
Buying tail coverage is a frequent step when a professional retires, changes carriers, or closes a practice. Without it, late-reported claims may have no policy to respond to.
Why professionals should care
For consultants, healthcare providers, accountants, and other advisors, the choice between occurrence and claims-made is not just a pricing footnote — it shapes whether old work stays protected after a policy changes.
A licensed insurance professional can explain how a policy is triggered, whether a retroactive date applies, and what tail options exist before you commit.
Frequently asked questions
Which is better, occurrence or claims-made?
Neither is universally better. Occurrence policies avoid reporting-gap issues but can cost more; claims-made policies are common in professional lines and rely on continuous coverage or tail coverage to stay effective.
What is a retroactive date?
On a claims-made policy, the retroactive date is generally the earliest incident date the policy will consider. Incidents before that date are typically excluded.
When should I buy tail coverage?
Commonly when a claims-made policy is ending — for example, on retirement, a carrier change, or closing a practice — so that late-reported claims about prior work can still be reported.
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