Claims-Made vs Occurrence Policies: Which Is Right for Your Firm?

The distinction between claims-made and occurrence policy forms is one of the most fundamental concepts in professional liability insurance. For law firms, this distinction has significant implications for coverage, cost, and long-term protection. While claims-made policies dominate the legal malpractice market, understanding both forms helps attorneys make informed coverage decisions.

How Occurrence Policies Work

An occurrence policy covers events that occur during the policy period, regardless of when the claim is actually filed. If your policy is in effect from January 1 to December 31, 2026, and an act of malpractice occurs on June 15, 2026, that act is covered even if the resulting claim is not filed until 2030, long after the policy has expired. Occurrence policies provide a clean, intuitive form of coverage: if the event happened while you were insured, you are covered.

How Claims-Made Policies Work

A claims-made policy covers claims that are first made and reported during the policy period, for acts occurring after the policy's retroactive date. Both the timing of the claim and the timing of the underlying act matter. If your claims-made policy runs from January 1 to December 31, 2026 with a retroactive date of January 1, 2020, you are covered for claims reported in 2026 for acts occurring on or after January 1, 2020. A claim reported on January 2, 2027 for the same act would not be covered unless you renew or purchase tail coverage.

Why Legal Malpractice Uses Claims-Made

The legal malpractice insurance market overwhelmingly uses claims-made policies for several practical reasons. Malpractice claims often arise years after the underlying legal work, making it extremely difficult for insurers to price occurrence coverage accurately. Claims-made policies give carriers more actuarial certainty because they know when claims will be reported and can set reserves accordingly. This actuarial advantage translates to lower premiums for policyholders compared to what occurrence-based malpractice coverage would cost.

Advantages of Claims-Made Policies

Claims-made policies offer several benefits to law firms. First-year premiums are typically lower because the exposure period is limited (only acts from the retroactive date to present, with an initial short history). As the policy matures and the covered period lengthens, premiums increase until they reach a mature level, usually by year five to seven. Claims-made policies also allow firms to increase their coverage limits over time, which is valuable for growing practices that could not initially afford high limits.

The Critical Importance of Continuity

The most significant risk with claims-made coverage is the gap exposure created when coverage lapses or is not renewed. If a claims-made policy expires without renewal or tail coverage, there is no mechanism to report claims for past acts. This makes continuity the single most important factor in managing claims-made coverage. A firm that maintains continuous claims-made coverage without gaps receives the same practical protection as an occurrence policy, plus the benefit of the typically lower claims-made pricing.

Choosing Between the Two

For most law firms, the choice is largely made by the market: claims-made policies are what carriers offer for legal malpractice. However, for other coverages like general liability, firms may have the option of occurrence-based forms. When occurrence coverage is available and competitively priced, it offers simplicity and eliminates the need for tail coverage. When choosing a claims-made policy, pay close attention to the retroactive date, tail coverage provisions, and the terms governing the extended reporting period.

Practical Recommendations

Regardless of which policy form your firm carries, take these steps: review your policy form annually with your broker, understand your retroactive date and how it is affected by carrier changes, budget for tail coverage as a long-term liability, and never allow your professional liability coverage to lapse, even briefly.