What is the difference between a claims-made and an occurrence policy? The distinction rarely comes up until a business is comparing two commercial insurance quotes that look similar on price but describe coverage very differently, or until a claim surfaces years after the work that caused it was finished.
Both terms describe how a liability policy decides which year's coverage applies to a given claim, and the answer is not always the year the claim shows up. This article looks at how each type is generally triggered, where the two commonly show up in a Canadian business's insurance program, and why the difference matters most at renewal and cancellation.
What Is the Difference Between a Claims-Made and an Occurrence Policy?
The difference between a claims-made and an occurrence policy comes down to timing: an occurrence policy is generally triggered by when the incident happened, while a claims-made policy is generally triggered by when the claim is reported. Under an occurrence form, the policy that was in force at the time of the incident is typically the one a resulting claim looks to, even if that claim is not made until several years afterward. Under a claims-made form, coverage generally depends on the policy being active, with a retroactive date and reporting period in place, at the point the claim is actually reported.
The two structures exist because some kinds of loss surface almost immediately, such as a slip and fall, while others, such as a design error or a missed regulatory filing, can take years to become apparent. Insurers built two different triggers to match those two patterns of risk.
How Occurrence Coverage Is Generally Triggered
An occurrence policy typically follows the date of the incident itself, not the date a claim is made or a lawsuit is filed. If a covered incident takes place while the policy is active, that policy year is generally the one the claim is measured against, regardless of how much time passes before the claim surfaces.
This structure is common for general liability exposures like bodily injury or property damage on a job site or at a place of business, where the cause and the harm are usually close together in time. One practical upside is that a business generally does not need to keep buying coverage indefinitely to protect against an old incident, since the year it happened is what matters, not how many policies have come and gone since.
How Claims-Made Coverage Is Generally Triggered
A claims-made policy works differently. Coverage typically depends on two things lining up: the claim has to be made and reported while the policy is active, and the underlying incident generally has to have occurred on or after the policy's retroactive date. A retroactive date, according to Dolden Wallace Folick's review of claims-made forms in Canada (2024), marks the point a claims-made policy will look back to; incidents before that date are usually excluded even if the claim itself is reported during an active policy term.
This structure is common for professional liability, errors and omissions, and directors and officers coverage, where the gap between a professional decision and a resulting claim can stretch for years. Because timing on both ends matters, switching insurers, retiring, or letting a claims-made policy lapse can leave a gap unless the business reviews tail coverage, sometimes called an extended reporting period, to keep reporting rights open for incidents that happened while the earlier policy was active.
Claims-Made vs. Occurrence: A Side-by-Side Look
The table below summarizes how each form is generally structured. Only the wording of an actual policy, and a licensed broker reviewing it, can confirm what applies to a specific business.
| Feature | Occurrence | Claims-Made |
|---|---|---|
| What typically triggers coverage | Date the incident happened | Date the claim is reported |
| Common lines of business | General liability, property | Professional liability, E&O, D&O |
| Effect of cancelling or switching carriers | Typically none for past incidents | May need tail coverage or a matched retroactive date |
| Retroactive date involved | Typically no | Typically yes |
Neither form is generally better across the board; each is built to fit the pattern of risk it is meant to cover, and a business often carries both forms across different parts of its commercial insurance program.
Benefits of Understanding the Difference
Knowing which trigger applies to a given policy helps a business avoid an unpleasant surprise years after a policy has lapsed or changed carriers. A business that assumes an old professional liability policy still protects work performed years earlier, without checking the retroactive date on its current claims-made policy, can discover the gap only once a claim actually arrives.
Understanding the distinction also makes it easier to compare two commercial insurance quotes fairly. A claims-made quote with a strong, unbroken retroactive date going back several years is generally worth more than one with a retroactive date reset to the current policy period, even if the premiums look similar on paper.
Where You'll Come Across This Question
This question tends to surface at a few specific moments rather than in day-to-day operations. Switching brokers or insurers is one, since a new claims-made policy's retroactive date needs to be checked against the old one to avoid an unintended coverage gap. Winding down a business, retiring from a professional practice, or merging with another company is another, since that is typically when tail coverage becomes relevant for any claims-made policies the business has carried.
Buying professional liability coverage for the first time, such as for a healthcare or consulting practice, is also a common trigger, since new policyholders are often comparing claims-made options across carriers and need to understand how a retroactive date on an errors and omissions policy actually works before choosing one. Businesses researching how CGL and professional liability insurance differ often run into the claims-made versus occurrence distinction at the same time, since the two questions are closely related.
Talk to a Licensed Broker About Which Trigger Applies to Your Policy
Whether a specific policy is written on a claims-made or occurrence basis, and whether tail coverage or a particular retroactive date matters for a given business, depends on the coverage being purchased and the wording of the actual policy. A licensed broker can review a current or proposed business insurance in Canada program and help build a commercial insurance quote that accounts for how each part of the program is triggered.
Coverage details vary by insurer and by policy, and only the wording of an actual policy and a licensed broker can confirm what applies to a specific situation.