8.3 Occurrence vs. Claims-Made Triggers
Key Takeaways
- An OCCURRENCE policy covers injury or damage that HAPPENS during the policy period, no matter when the claim is reported — the standard for HO, PAP, and the ISO CGL CG 00 01.
- A CLAIMS-MADE policy (ISO CG 00 02) covers claims FIRST MADE during the policy period, and only for events on or after the RETROACTIVE DATE.
- Claims-made policies use Basic and Supplemental Extended Reporting Periods (ERPs, or 'tail') to cover late-reported claims after the policy ends.
- Moving the retroactive date forward or letting a claims-made policy lapse without buying tail creates a dangerous coverage GAP for past acts.
- Claims-made is common in professional liability (E&O, D&O, medical malpractice) where injury and claim are often years apart.
The Coverage Trigger Question
A coverage trigger answers: which policy period must respond to this loss? For most property and personal-lines coverage the answer is obvious — the loss happens on a date. Liability is harder because injury, discovery, and the lawsuit can span years (think slow-developing toxic exposure or a professional error not caught for a decade). Two trigger structures exist.
| Trigger | Coverage applies when... | ISO CGL Form | Common In |
|---|---|---|---|
| Occurrence | the injury/damage HAPPENS during the term | CG 00 01 | HO, PAP, most CGL |
| Claims-made | the CLAIM is first MADE during the term | CG 00 02 | E&O, D&O, malpractice |
Exam phrasing: "An occurrence policy is triggered by when the injury occurs; a claims-made policy is triggered by when the claim is reported."
Occurrence Trigger
An occurrence policy responds if the BI or PD takes place during the policy period, regardless of when the claim is finally presented. A claim filed years later still goes back to the policy in force when the injury occurred.
Worked example: A 2024 occurrence CGL is in force when a customer slips and is injured in 2024. The customer sues in 2027. The 2024 occurrence policy responds, even though it expired years earlier and the insured now has a different carrier.
Strengths: simple, no retroactive date to manage, and coverage is "locked in" once the term ends.
Weakness for insurers: the long-tail problem — an insurer may face claims decades after collecting the premium, which is exactly why high-exposure professional lines moved to claims-made.
Claims-Made Trigger
A claims-made policy responds only when the claim is first made against the insured during the policy period (or any extended reporting period), AND the wrongful act occurred on or after the retroactive date.
Two Key Dates
- Retroactive date — the earliest date of a covered wrongful act. Events before it are never covered. A first-year policy often sets the retro date equal to inception (no prior-acts coverage); a mature program keeps the original retro date so all years of practice remain covered.
- Extended Reporting Period (ERP / "tail") — extends the time to report claims after the policy ends:
- Basic (mini) tail — automatic, short (often 60 days to report, with a longer 5-year window for claims from occurrences already reported).
- Supplemental tail — purchased, often unlimited duration, for an extra premium.
Trap: A claims-made insured who switches carriers and lets the old policy lapse without buying tail has a gap — the old occurrence already happened, the new claims-made policy's retro date excludes it, and no one pays.
Comparing and Choosing Triggers
The exam loves scenario questions where the wrongful act, the claim, and the policy switch fall in different years. Work them with a date timeline.
- Occurrence policy: match the date of injury to the policy in force then.
- Claims-made policy: confirm two things — (1) the claim is first made within the period or ERP, and (2) the act date is on or after the retro date. If either fails, no coverage.
Worked example: A claims-made E&O policy runs 2025-2026 with a retro date of 1/1/2023. An error made in 2022 produces a claim in 2025. No coverage — the error predates the retroactive date, even though the claim arrived during the term.
Why insurers favor claims-made for professional risks: it lets them re-price and re-underwrite annually instead of being locked into rates set years ago. Why insureds must be careful: retro-date management and buying tail when leaving a program are essential to avoid gaps.
Retroactive Dates, Extended Reporting, and the Laser
Claims-made coverage adds machinery the exam tests in detail. The retroactive date is the earliest date an injury can occur and still be covered; injuries before it are excluded even if the claim is filed during the policy period. Extended reporting periods (ERP / tail) let an insured report claims after the policy ends for occurrences during the policy term: a basic (mini) tail is automatic and short (e.g., 60 days to report, plus a longer window for occurrences already noticed), while a supplemental (full) tail is purchased for a longer or unlimited period.
Advancing the retroactive date or refusing to provide a tail can create a dangerous coverage gap when an insured switches carriers.
Why the Trigger Choice Matters for Long-Tail Claims
The trigger choice matters most for long-tail exposures — professional liability, products, pollution, and construction defects — where the injury and the claim are separated by years. Occurrence coverage locks in the limits and terms of the policy in force when the injury happened, no matter how late the claim arrives, but exposes the insurer to "stale" claims and inflation. Claims-made coverage responds based on the policy in force when the claim is made, giving insurers better loss-cost predictability, which is why it dominates medical malpractice and D&O.
A correct answer usually hinges on identifying both the injury date and the claim date against the retroactive date and policy period.
A claims-made liability policy is triggered by:
A claims-made E&O policy in force for 2025 has a retroactive date of January 1, 2023. A professional error committed in 2022 generates a claim in 2025. Is the claim covered?