Claims-Made vs Occurrence: Why It Matters for Legal Malpractice

By Tamir Lerner | Law Firm Insurance Pros | Updated July 2026

The claims-made versus occurrence distinction sounds like insurance jargon, but for attorneys it decides whether a claim gets paid. Because lawyers professional liability (LPL) is written on a claims-made basis, misunderstanding it is one of the easiest ways to end up personally exposed. Here is what the two triggers mean and why it matters for your firm.

What is the difference between claims-made and occurrence?

The two policy types are triggered by different events.

With an occurrence policy, if the mistake happened while the policy was in force, you are covered even if the claim shows up a decade later. With a claims-made policy, timing works differently: it does not matter as much when the error happened; what matters is that the claim is made and reported while a policy is active and the error occurred on or after your retroactive date.

Why is legal malpractice insurance claims-made?

Professional liability claims have a "long tail" — an alleged error in a will, a transaction, or a litigation strategy may not surface until years later, when the harm becomes apparent. Occurrence coverage for such long-tail risks is extremely hard to price, because carriers would be on the hook for unknown future claims tied to old policies. Claims-made policies let insurers underwrite and price the risk based on current, known exposures. That is why nearly every LPL carrier writes claims-made coverage. The International Risk Management Institute (IRMI) explains the mechanics of claims-made forms in depth.

What does this mean for coverage gaps?

This is the part that catches attorneys off guard. Under a claims-made policy, if your coverage lapses, you can lose protection for all your prior work, not just work done during the gap. Consider a lawyer who lets a policy expire without replacing it. A former client then sues over a matter handled two years earlier. With no active claims-made policy in force to report the claim to, there may be no coverage at all — even though the work was done while the lawyer was fully insured back then.

The lesson: with claims-made coverage, continuity is everything. You must keep a policy in force, or buy an extended reporting period, to stay protected for your past work.

How do retroactive dates and tail coverage fit in?

Two features exist specifically to manage the timing problem in claims-made coverage.

Retroactive date

Your retroactive date is the earliest date of work the policy will cover. A claim is only covered if the underlying act happened on or after that date and the claim is reported during the policy period. When you renew or switch carriers, protecting your retroactive date preserves years of prior-acts coverage.

Tail coverage (extended reporting period)

When a claims-made policy ends and is not replaced — because you retire, sell the firm, or close it — a tail, or extended reporting period (ERP), lets you report claims for past work after the policy is gone. It is the safety net that makes claims-made coverage workable at the end of a career or a firm's life.

What should attorneys do about it?

• Never allow a lapse. Bind renewal or replacement coverage before the current policy ends.
• Protect your retroactive date whenever you change carriers so prior acts stay covered.
• Ask about prior-acts coverage when moving policies; a new carrier can often cover your history back to your original retroactive date.
• Plan tail coverage early if retirement, a sale, or a wind-down is on the horizon.
• Report circumstances promptly. Under claims-made rules, timely notice is a condition of coverage.

This article is general information, not legal or insurance advice. Coverage terms and triggers vary by carrier and state. Review actual policy language and consult a licensed insurance professional before making decisions.