Difference Between Claims-Made and Occurrence Policies

Claims-Made Coverage Usually Costs Less

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There are two basic types of commercial liability policies: occurrence and claims-made. The primary difference between the two has to do with the coverage trigger, the event that initiates coverage. An occurrence policy is triggered by an injury that occurs while the policy is in effect. A claims-made policy is triggered by a claim that's filed during the policy period.

Most general liability and commercial umbrella insurance is written on occurrence policies. Conversely, errors and omissions (professional liability) insurance is usually written on claims-made policies.

Occurrence Coverage

Most small businesses purchase a general liability policy like the standard ISO liability policy. It covers claims seeking damages for bodily injury or property damage caused by an occurrence.  It also covers claims alleging personal and advertising injury caused by an offense. Claims or suits are covered if the alleged bodily injury, property damage or offense occurs during the policy period. 

Many other types of liability insurance are written on occurrence forms. Examples are auto liability and employers liability. The liability section of the standard business auto policy covers bodily injury or property damage and associated pollution costs caused by an accident. For the injury, damage or costs to be covered, the accident must occur during the policy period. Similarly, the employers liability section of the standard NCCI workers comp policy covers bodily injury by accident if the accident occurs during the policy period. Bodily injury by disease is also covered if the last day of the employee's last exposure to the disease-causing conditions occurs during the policy term.

The primary advantage of occurrence policies is that they cover claims filed during the policy period or anytime thereafter. As long as the triggering event took place during the policy period, any claim that results should be covered. The timing of the claim doesn't matter.


Occurrence policies are particularly valuable for covering product liability, environmental liability, occupational disease, and other long-tail liability exposures.

Claims-Made Coverage

A claims-made policy covers claims made against an insured during the policy period. Coverage is typically triggered when the insured receives notice, during the policy period, that a claim has been filed. The injury that led to the claim may have occurred during the policy period or before the policy inception date.

A coverage gap can occur if a business switches from claims-made coverage to an occurrence policy. The claims-made insurance won't cover claims made after the policy expires. Such claims won't be covered under the occurrence policy either if they arise from events that took place before the occurrence policy began.

Fortunately, businesses insured under claims-made policies can obtain coverage for future claims by purchasing an extended reporting period (also called an ERP or "tail coverage"). An ERP usually applies for a specific time period (such as three years) but is sometimes unlimited.

Some claims-made policies include a retroactive date, which serves as a cut-off point for covered incidents. It excludes claims arising from incidents that occurred before the retroactive date.


If you switch from one claims-made policy to another, your retroactive date should remain the same. Otherwise, you'll will lose coverage for claims arising from events occurring between your old retroactive and the new one.

Cost of Coverage

One advantage of claims-made coverage is price. If two policies provide the equivalent coverage but one is claims-made and the other is occurrence, the claims-made policy is usually cheaper. This is especially true during the first few years of claims-made coverage. The following example demonstrates why this is the case.

Smith Inc. has been in business for 10 years and all of its policies have been written on occurrence forms. Smith Inc. has just purchased its first claims-made general liability policy from the Ideal Insurance Company. The policy runs from January 1, 2020 to January 1, 2021, and it has a retroactive date of January 1, 2020. The premium is $5,000, which is $2650 less the $7650 premium Smith paid for its last occurrence policy.

The new policy covers any claims made against Smith Inc. during the 2020-2021 policy year that arise out of events that occur during that year. When Smith Inc. renews the policy following January the premium rises to $5,500. This is because the renewal policy covers claims made during the 2021-2022 policy term that arise from incidents occurring over a two-year period (between January 1, 2020 and January 1, 2022).

Smith Inc.’s premium will rise again when its liability policy renews for 2022-2023 policy term. That policy will cover claims arising from events occurring over a three-year period (2020-2023) if such claims are made during the 2022-2023 policy term. Smith's renewal premiums will rise every year until, say 2027. At that point, Ideal Insurance will decide that no more claims will arise from events that occurred in 2020 and will stop including a charge for such claims in renewal premiums.

Article edited by Marianne Bonner

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  1. North Star Mutual, "Commercial General Liability Coverage Form," page 1, accessed January 17, 2020.

  2. North Star Mutual, "Commercial General Liability Coverage Form," page 6, accessed January 17, 2020.

  3. North Star Mutual, "Business auto Coverage Form," page 2, accessed January 17, 2020.

  4. North Star Mutual, "Business auto Coverage Form," page 10, accessed January 17, 2020.

  5. Workers Compensation Rating Inspection Bureau of Massachusetts, "Workers Compensation and Employers Liability Insurance Policy," page 2, accessed January 17, 2020.

  6. Society of Actuaries, "Understanding Your Claims-Made Professional Liability Insurance Policy," page 4, accessed January 20, 2020.

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