8.3 Occurrence vs. Claims-Made Triggers

Two Ways to Trigger Coverage

The single most-tested liability mechanic on the national exam is what event triggers a policy to respond. There are two systems.

Occurrence Trigger

An occurrence policy responds if the injury or damage takes place during the policy term — even if the claim surfaces years after the policy expires. This is ideal for long-tail exposures where harm shows up slowly. The policy in force at the time of injury pays, full stop.

The Claims-Made Trigger and the Retroactive Date

A claims-made policy responds when the claim is first made against the insured during the policy period, but only if the injury occurred on or after the retroactive date shown on the declarations.

• Retroactive date — the earliest date of injury the policy will cover. Injury before the retro date is never covered, no matter when the claim is filed.
• Coverage trigger date — the date the claim is made (or reported), which must fall in the policy period or an extended reporting period.

Worked Timeline

Assume a claims-made policy with a retroactive date of 1/1/2024 and a policy period of 1/1/2026 to 1/1/2027.

Trap: A claims-made policy is not the policy in force when the injury happened — it is the one in force when the claim is reported, as long as the retro date is satisfied.

Tail and Nose Coverage

Because claims-made coverage can leave gaps when a policy ends or an insured switches carriers, two devices fill them.

• Tail coverage (Extended Reporting Period, ERP) — lets the insured report claims after the claims-made policy expires for injuries that occurred during the policy term (after the retro date). A Basic ERP is automatic and short (e.g., 60-day mini-tail plus a 5-year reporting window for known incidents); a Supplemental ERP is purchased for an unlimited reporting window.
• Nose coverage (prior acts) — when moving to a new claims-made carrier, the insured asks the new insurer to set a retro date matching the old policy, so past exposures stay covered without buying a tail.

Claims-Made Maturity

A first-year claims-made policy is cheap because only one year of exposure can produce claims. As the retro date and inception date spread apart, the policy 'matures' and premiums rise each year (first-year, second-year, mature) until it reaches an occurrence-equivalent price after about five years.

Memory aid: Tail = after the policy (report late). Nose = before the policy (cover prior acts). Picture the policy period as a face: nose in front, tail behind.

Why Insurers Use Each Trigger

The choice of trigger is an underwriting decision driven by how quickly a loss becomes known.

IBNR stands for incurred but not reported — losses that have happened but no claim has yet been filed. Occurrence policies must reserve for IBNR for years, which is exactly the uncertainty claims-made forms were created to avoid.

The Reporting Requirement

Some claims-made forms are 'pure claims-made' (the claim must merely be made during the period), while many ISO CGL claims-made forms are 'claims-made-and-reported' — the claim must be both made and reported to the insurer during the period or ERP. Read the declarations: a late report can forfeit coverage even when the claim itself arose in the policy period.

Trap: Personal lines never use claims-made. If a question puts a claims-made trigger on a homeowners or personal auto policy, that answer is wrong by definition.

Triggers of Coverage for Long-Tail Injury

For latent injuries (asbestos, pollution) that develop over years, courts have adopted competing trigger theories to decide which occurrence policies respond: exposure (policy at first exposure), manifestation (policy when injury becomes known), continuous/injury-in-fact (every policy from exposure through manifestation), and the triple trigger. These theories explain why multiple years of occurrence policies can be pulled into one long-tail claim.

Trap: These trigger theories apply to occurrence forms. Claims-made sidesteps the debate entirely because the trigger is simply when the claim is reported - which is exactly why insurers created claims-made for hard-to-reserve exposures.