15.3 Professional Liability and Errors & Omissions
Key Takeaways
- Professional liability (errors & omissions) covers economic loss caused by a professional's negligent act, error, or omission in rendering or failing to render professional services — exposures the CGL excludes.
- E&O is almost always written on a claims-made basis with a retroactive date; coverage applies only if the claim is first made and reported during the policy period and the act occurred on or after the retro date.
- Extended reporting periods (tail coverage) preserve the ability to report claims after the policy ends, while prior-acts (nose) coverage moves the retro date back when switching carriers.
- Medical malpractice is a specialized E&O line; the consent-to-settle (hammer) clause can shift defense-cost responsibility to the insured who refuses a recommended settlement.
- Defense costs are commonly inside the limit (eroding/wasting limits) in E&O, unlike many CGL forms where defense is outside the limit — read whether the limit is depleted by defense.
Why Professionals Need E&O — The CGL Gap
The Commercial General Liability (CGL) form covers bodily injury and property damage but contains a professional-services exclusion. A lawyer who misses a filing deadline, an accountant who miscalculates a tax position, or an architect whose design is defective causes pure economic loss — financial harm with no physical injury — which the CGL does not touch.
Professional liability, also called errors & omissions (E&O), fills that gap. It responds to a negligent act, error, or omission committed in the rendering of (or failure to render) professional services. Common lines include:
- Medical malpractice — physicians, dentists, nurses, hospitals
- Legal malpractice — attorneys
- Accountants E&O — CPAs, tax preparers
- Insurance agents/brokers E&O — failure to procure or properly advise
- Architects & engineers (A&E) E&O — design defects
- Technology/cyber E&O — software, IT services
The distinguishing feature is that E&O covers financial damages from professional mistakes, not third-party slip-and-fall injuries (that stays with the CGL).
Claims-Made Triggers and the Retroactive Date
Most E&O is written on a claims-made (and reported) basis, not occurrence. Coverage requires two conditions to align:
- The wrongful act occurred on or after the retroactive date, and
- The claim is first made against the insured and reported to the insurer during the policy period (or any extended reporting period).
The retroactive (retro) date is the earliest date of a covered act. Acts before the retro date are never covered, no matter when reported.
| Scenario | Act date | Claim made/reported | Covered? |
|---|---|---|---|
| A | After retro date | During policy period | Yes |
| B | Before retro date | During policy period | No — pre-retro act |
| C | After retro date | After policy ends (no tail) | No — claim not reported in period |
| D | After retro date | After policy ends, within ERP/tail | Yes |
Worked example. A consultant has an E&O policy running 1/1/2026–1/1/2027 with a retro date of 1/1/2023. A negligent report drafted in 2024 triggers a lawsuit filed and reported in March 2026. Because the act (2024) is after the retro date (2023) and the claim is made during the policy period (2026), it is covered.
Occurrence vs. Claims-Made and Why the Industry Switched
It helps to contrast the two triggers directly. An occurrence policy responds to events (injury/damage/error) that happen during the policy period, whenever the claim arrives — even decades later. A claims-made policy responds to claims first made during the period, regardless of when the act occurred (subject to the retro date).
Professional liability migrated almost entirely to claims-made because professional mistakes have a long tail: an architect's design flaw or an accountant's tax error may not surface as a lawsuit for many years. With occurrence coverage the insurer faces unknowable future liability and cannot price it; claims-made lets the insurer reserve and price against claims actually being reported. The price the insured pays is the retro-date and reporting discipline described above.
| Feature | Occurrence | Claims-Made |
|---|---|---|
| Trigger | When the event happens | When the claim is first made |
| Long-tail pricing | Hard for insurer | Manageable |
| Retro date | None | Yes — limits how far back acts reach |
| Tail needed at expiration? | No | Yes, to report later claims |
Step-factor pricing. A claims-made policy is cheap in year one (only first-year acts can mature into reported claims) and rises each renewal as more prior years of acts become reportable, reaching "mature" pricing around year five. Switching carriers resets this unless prior-acts coverage carries the retro date forward, which is why insureds rarely change E&O carriers casually.
An attorney's legal-malpractice E&O policy has a retroactive date of 6/1/2022 and a policy period of 6/1/2026 to 6/1/2027. A drafting error made on 3/1/2021 results in a claim first made and reported in September 2026. Is the claim covered?
Tail Coverage, Prior Acts, the Hammer Clause, and Defense-Within-Limits
Because claims-made coverage stops responding once the policy ends, two mechanisms preserve protection:
- Extended Reporting Period (ERP / "tail") — lets the insured report claims after expiration for acts that occurred during the expired policy's coverage window. Bought when a professional retires, dies, or cancels and does not replace with claims-made coverage. A basic tail is short (e.g., 60 days); a supplemental/full tail can run several years or be unlimited.
- Prior-acts ("nose") coverage — when switching carriers, the new insurer can move the retro date back to the original date, covering pre-policy acts. This is the mirror image of a tail.
Two more heavily tested features:
- Consent-to-settle / hammer clause. Many E&O policies (especially medical malpractice) require the insured's consent to settle. If the insurer recommends settling and the insured refuses, the hammer clause caps the insurer's payment at the rejected settlement amount plus defense to that point, shifting the excess cost to the insured.
- Defense within limits (eroding/wasting limits). Unlike many CGL forms where defense costs are paid in addition to the limit, E&O commonly pays defense costs inside the limit — every dollar of defense reduces the dollars left for indemnity. A $1,000,000 limit with $300,000 in defense leaves only $700,000 for settlement or judgment.
A physician retires and cancels a claims-made medical-malpractice policy without replacing it. Six months later, a patient files suit over a procedure performed while the policy was active. What should the physician have purchased to be protected?