15.3 Professional Liability and Errors & Omissions
Key Takeaways
- Professional liability, also called Errors and Omissions (E&O), covers economic loss caused by a professional's negligent act, error, or omission in rendering or failing to render professional services - it does not require bodily injury or property damage.
- Most E&O and malpractice policies are written on a claims-made basis with a retroactive date; only claims first made during the policy period for acts after the retro date are covered.
- An Extended Reporting Period (ERP), or tail, lets the insured report claims after a claims-made policy ends for acts that occurred during the policy term.
- Medical malpractice covers professional services rendered to patients; general liability covers slips and falls - the two are deliberately separated.
- Defense costs in many professional liability policies erode (reduce) the limit of liability, unlike CGL where defense is usually outside the limit.
What Professional Liability Covers
Professional liability, marketed as Errors and Omissions (E&O) for non-medical fields and malpractice for medical and legal fields, covers economic loss a client suffers because of a professional's negligent act, error, or omission while performing professional services.
The key distinction from Commercial General Liability (CGL): CGL covers bodily injury and property damage, while professional liability covers financial injury from faulty advice or service. A CGL policy expressly excludes professional services.
Standard of Care and Why CGL Will Not Respond
Professional liability is rooted in negligence: the professional owed a duty to meet the standard of care of a reasonable practitioner in that field, breached it, and caused the client financial harm. An accountant who misfiles a tax return, an architect whose drawings are flawed, or an insurance agent who fails to bind requested coverage all create E&O exposures.
The CGL contains a professional services exclusion, so a design firm cannot rely on its CGL for a faulty-design claim. This separation is intentional: the underwriting, pricing, and claims handling for professional mistakes differ entirely from premises and operations liability. Expect a stem asking which policy responds to bad professional advice - the answer is E&O, never CGL.
The Claims-Made Trigger and Retroactive Date
Most E&O and malpractice forms are claims-made. Coverage applies only when both are true:
- The claim is first made against the insured during the policy period (or ERP), and
- The wrongful act occurred on or after the retroactive date.
The retroactive date caps how far back covered acts can reach. A policy with a retro date of 1/1/2024 will not cover a 2022 error even if the claim arrives in 2026. This is the single most-tested concept in the section.
Tail Coverage (Extended Reporting Period)
Because claims-made coverage ends when the policy ends, an Extended Reporting Period (ERP) - the tail - lets the insured report later claims for acts during the expired policy term.
| Tail type | Function |
|---|---|
| Basic (mini) tail | Short automatic window, often 30-60 days, no extra premium |
| Supplemental tail | Purchased, can be 1-3 years or unlimited |
A professional who retires under a claims-made policy buys a tail so a malpractice suit filed two years later is still covered. The retro date does not move during the tail.
A consultant's claims-made E&O policy has a retroactive date of January 1, 2025. In March 2026 a client sues over advice the consultant gave in October 2024, while the policy is still active. Is the claim covered?
Occurrence vs. Claims-Made - The Core Contrast
The exam constantly compares triggers:
| Feature | Occurrence | Claims-Made |
|---|---|---|
| Trigger | The wrongful act happens during the policy period | The claim is first reported during the period |
| Retroactive date | Not used | Used to cap how far back acts reach |
| Tail needed at expiration | No | Yes, to report late claims |
| Typical use | Some medical malpractice, CGL | Most E&O, D&O, EPLI |
Under occurrence coverage, the policy in force when the error happened responds - even if the claim arrives a decade later. Under claims-made, the policy in force when the claim is reported responds, which is why the retro date and tail matter so much.
Defense Costs and Common Specialties
A major exam trap: in many professional liability policies, defense costs erode the limit. A $1,000,000 limit reduced by $300,000 of legal defense leaves only $700,000 to pay a judgment. CGL, by contrast, usually pays defense in addition to the limit.
Common specialty forms include:
- Medical malpractice - physicians, hospitals, dentists.
- Legal malpractice - attorneys.
- Miscellaneous E&O - accountants, architects, insurance agents, IT consultants.
Most are claims-made; medical malpractice is occasionally occurrence-based, which the exam contrasts deliberately.
Consent-to-Settle and Insuring Agreement Nuances
Professional liability often includes a consent-to-settle clause: the insurer cannot settle a claim without the professional's agreement, protecting the insured's reputation. Some policies pair this with a hammer clause - if the insured refuses a recommended settlement, the insurer's liability is capped at the rejected settlement amount plus defense to that date.
Key definitions:
- Professional services - the specialized work the insured is qualified to perform; only acts within that scope are covered.
- Wrongful act - a negligent act, error, or omission in rendering professional services.
Intentional, dishonest, or fraudulent acts are excluded, as are bodily injury and property damage covered under the CGL.
Prior Acts, Nose Coverage, and Switching Carriers
When a professional switches claims-made carriers, the retroactive date should be preserved so past acts stay covered. A new policy that offers prior acts (also called nose coverage) picks up the old retro date instead of resetting it to the new effective date - the opposite of buying a tail from the expiring insurer.
| Solution | Bought from | Function |
|---|---|---|
| Tail (ERP) | Expiring insurer | Report late claims for old acts |
| Nose / prior acts | New insurer | Cover old acts under the new policy |
The exam may give a fact pattern of a professional changing carriers and ask which device keeps the original retroactive date intact - that is nose / prior-acts coverage, purchased from the incoming insurer.
A physician retires and cancels her occurrence-based malpractice policy. Eighteen months later, a patient sues over a procedure performed during the policy term. Does she need to buy a tail?