Claims-Made Policy: Definition and How It Works

A claims-made policy is a liability insurance policy that provides coverage for claims first reported to the insurer during the policy period, regardless of when the alleged wrongful act occurred — subject to the retroactive date. This is the dominant trigger structure for professional liability (errors and omissions), directors and officers liability, employment practices liability, and cyber liability policies. It is one of the most fundamental distinctions in commercial insurance: a claims-made policy responds to when a claim is made, while an occurrence policy responds to when an event happens. For brokers, understanding claims-made mechanics is essential to advising clients on retroactive date continuity, tail coverage needs, and the risks of gaps in coverage.

The Claims-Made Trigger

A claims-made policy responds to a claim (or, in some forms, a circumstance that may give rise to a claim) that is first made against the insured and reported to the insurer during the policy period. Both conditions — the claim being made and being reported — must typically occur within the policy period (or reporting window) for coverage to respond.

This contrasts with an occurrence policy, which responds to bodily injury, property damage, or other covered harm that occurs during the policy period, regardless of when the claim is filed. An occurrence-triggered general liability policy written in 2015 can be triggered by a lawsuit filed in 2026 if the injury occurred in 2015. A claims-made policy written in 2026 cannot respond to a claim arising from a 2015 act unless the current policy has a retroactive date that extends coverage back to 2015.

Retroactive Date

The retroactive date (also called the "prior acts date") is the earliest date from which the claims-made policy provides coverage for wrongful acts. If a retroactive date is set to January 1, 2020, the policy will cover claims made during the current policy period arising from wrongful acts that occurred on or after January 1, 2020. Wrongful acts occurring before the retroactive date are excluded — they are "prior acts" not covered by the current policy.

Retroactive dates are critical to coverage continuity. When a professional first purchases a claims-made E&O policy, the retroactive date is typically set to the policy inception date — providing no retroactive coverage. As the professional renews the policy each year, the carrier should maintain or advance the retroactive date. After several renewals with the same carrier, the professional has a retroactive date that goes back to when they first started professional practice, providing full prior acts coverage.

When a professional changes carriers without preserving the retroactive date, coverage for prior acts depends on whether the prior carrier provides an extended reporting period (tail coverage) or the new carrier agrees to match the prior retroactive date. Failing to address this continuity issue is one of the most common broker E&O scenarios in professional liability placement.

Extended Reporting Period (Tail Coverage)

An extended reporting period (ERP), commonly called tail coverage, is an endorsement (or separate policy) that extends the period during which claims can be reported to the insurer after the claims-made policy has expired or been cancelled. Tail coverage does not extend the policy's coverage period — it cannot pick up new wrongful acts after the tail endorsement's prior acts cutoff date. It only extends the window for reporting claims arising from acts that occurred while the original policy was in force.

Tail coverage is critical in two scenarios:

1. Retirement or cessation of practice: When a professional stops practicing, they no longer renew their claims-made policy. Without a tail endorsement, claims arising from prior acts have no coverage once the policy lapses. E&O policies for CPAs, attorneys, physicians, and other professionals typically include a mandatory or optional tail endorsement provision; brokers should discuss tail needs whenever a client retires or winds down operations.

2. Carrier change without continuity: When switching carriers, if the new carrier will not provide full retroactive coverage back to the inception of the prior policy, the insured needs a tail endorsement from the prior carrier to cover the gap in prior acts coverage.

Tail endorsement costs vary by carrier and profession — typically 150%–300% of the expiring annual premium for a multi-year or unlimited tail. Brokers should negotiate tail cost provisions at the time of initial binding, before a carrier change is needed, when leverage is highest.

Occurrence vs. Claims-Made: When Each Is Used

Professional liability and financial lines policies are predominantly claims-made because the harm from a professional error or management decision may not become apparent for years after the act. A tax return filed in 2022 may not generate a client complaint until 2026 — an occurrence trigger would require keeping indefinitely open policies from every prior year to respond to those eventual claims.

For a detailed comparison of coverage trigger mechanics, premium structure over time, and when occurrence-equivalent coverage might be preferable, see Occurrence vs. Claims-Made E&O Coverage: Which Policy Structure Protects Your Clients?.

Related Terms

• Occurrence policy — the alternative trigger structure; responds to events that happen during the policy period regardless of when the claim is filed
• Retroactive date — the earliest date from which a claims-made policy provides prior acts coverage
• Extended reporting period (ERP) — tail coverage that extends the claims reporting window after policy expiration
• Subrogation — an insurer's right to recover from a third party after paying a claim; arises in both claims-made and occurrence policies
• Technology E&O Insurance for SaaS Companies — an example of claims-made professional liability placed for tech clients

How Insurance Brokers Use Claims-Made Policy Knowledge in Practice

Brokers advising professional services clients — CPAs, consultants, architects, engineers, IT firms — must understand claims-made mechanics at the transaction level:

At binding: Set the retroactive date to the client's earliest professional services date, not the current policy inception. A new client who has been providing professional services for five years should have a retroactive date five years back — not the date they became your client. Confirm this is in the binder and the policy.

At renewal: Confirm the carrier is maintaining the retroactive date. Some carriers quietly move the retroactive date forward on renewal without informing the broker; this creates a hidden gap in prior acts coverage. Review the declarations page on every renewal.

At carrier change: If switching carriers, confirm whether the new carrier will provide full retroactive coverage or only coverage from the switch date forward. If full retroactive coverage is unavailable or priced prohibitively, price a tail from the expiring carrier before releasing the renewal.

At client retirement: Proactively discuss tail coverage needs and cost at least one renewal before the client expects to retire. Tail coverage purchased while the client is still a policyholder in good standing is typically less expensive than coverage purchased at the point of retirement, when the client has less negotiating leverage. For guidance on limits appropriate for a broker's own practice, see How Much E&O Coverage Should an Insurance Broker Carry?.