The key difference is what triggers coverage. An occurrence policy generally looks at when the injury or damage happened; a claims-made policy generally looks at when the claim is first made or reported. With claims-made coverage, the event also usually must fall on or after the policy’s retroactive date, and reporting deadlines apply. The policy wording, endorsements and applicable state law determine how a specific claim is handled.
How the two policy forms differ
| Question | Occurrence policy | Claims-made policy |
|---|---|---|
| What generally triggers coverage? | Injury or damage occurs during the policy term. A claim may arrive later, subject to the policy’s terms and notice requirements. | The claim is first made during the policy period or an applicable extended reporting period, and the injury, damage or wrongful act generally occurs on or after the retroactive date. |
| Which policy year may matter? | Usually the year the covered injury or damage occurred. | Usually the period when the claim is first made or reported, subject to the retroactive date and policy wording. |
| What if the policy has ended? | A later claim may still involve the policy in force when the injury or damage occurred. Check its notice rules and terms. | A later claim may require an extended reporting period (ERP), often called tail coverage, unless a successor policy preserves the necessary coverage. |
| What should you check first? | What qualifies as an occurrence, when the injury or damage happened, and what notice rules apply. | The retroactive date, prior-acts coverage, claim and reporting deadlines, and any ERP terms. |
This is a general comparison, not a coverage decision. The actual policy and applicable law control.
What the key terms mean
Occurrence policy
In general, this form connects coverage to injury or damage that occurs during the policy period, even if the resulting claim is made later. The policy’s definition of an occurrence, exclusions, limits and notice provisions still matter.
Claims-made policy
This form generally requires the claim to be first made during the policy period or an applicable reporting extension. It may also require the underlying injury, damage, wrongful act or omission to occur on or after a specified retroactive date. Virginia’s regulation defines claims-made liability coverage in relation to both the applicable retroactive date and when the claim is first made. Virginia Administrative Code, 14VAC5-335-20
Retroactive date and prior-acts coverage
The retroactive date sets the earliest point from which an event may qualify under a claims-made policy. An event before that date may fall outside coverage even if the claim arrives during the current policy period. Prior-acts coverage, sometimes called “nose” coverage, may extend a new policy to qualifying work done before its effective date, typically subject to its terms and underwriting. The New York Department of Financial Services’ 2007 opinion discusses prior-acts coverage in its regulatory context.
Extended reporting period, or tail
An ERP can extend the time to report certain claims after a claims-made policy ends. It does not extend the period in which the underlying event may have occurred, move the retroactive date or remove exclusions. Its availability, length, price and purchase deadline depend on the policy and applicable rules. A New York DFS opinion on Regulation 121 describes a 60-day automatic ERP and an offered three-year period in the specific New York regulatory setting it addresses; those periods are not universal terms for every policy.
What to check when changing claims-made policies
A switch can create a gap if the new policy does not cover earlier work and the old policy no longer accepts claims. Before a renewal, cancellation or insurer change, compare the terms in writing:
- Find the current retroactive date. Check the declarations and endorsements, not just a quote summary.
- Confirm continuity on the proposed policy. Ask whether it retains that date or expressly includes the prior-acts coverage you need. Do not assume earlier work is covered automatically.
- Check claim and circumstance reporting rules. Note when a claim must be made and reported, and how the policy treats known claims or circumstances.
- Review the old policy’s ERP terms. Check whether an ERP is automatic or optional, how long it lasts, its cost, and the deadline and conditions for buying it.
- Compare exclusions, limits and notice terms. Matching retroactive dates alone does not establish that the policies cover the same work or claims.
Insurers may make prior-acts coverage subject to underwriting; it is not an automatic feature of every replacement policy. The New York DFS opinion discusses this issue in its state-specific context.
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Neither form is universally better. Availability, pricing, reporting requirements and terms vary by insurer, coverage type, state and contract. Some insurers describe occurrence coverage as potentially more expensive, but the cited consumer explanations do not establish a general price difference or a reliable average. Compare actual offers, including the cost of an ERP or prior-acts coverage where relevant. Progressive Commercial’s explanation and The Hartford’s comparison discuss these forms, but neither substitutes for the policy language.
- For occurrence coverage: identify when the injury or damage occurred, how the policy defines an occurrence, and what notice duties apply.
- For claims-made coverage: confirm the retroactive date, whether the claim must be made or reported within a particular time, and how coverage continues if you switch or stop buying the policy.
- For either form: compare exclusions, limits, covered activities and the exact reporting conditions—not just the policy label or premium.
Geography and policy wording matter
These terms describe common U.S. liability-insurance usage, not a single rule for every policy. State law, coverage type and contract language can affect definitions, reporting duties and required ERP terms. Texas Department of Insurance consumer guidance addresses commercial general liability, while the Virginia and New York sources cited above apply to their own regulatory settings. For a live claim, cancellation or transition, promptly review the declarations, base form and endorsements with the insurer or a licensed insurance professional.
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