Definition:Errors and omissions (E&O)

📋 Errors and omissions (E&O) is a form of professional liability insurance that protects individuals and firms against claims alleging negligent acts, mistakes, or failures to perform professional duties. Within the insurance industry, E&O carries a dual significance: it is both a product that insurers sell to professionals across many sectors — lawyers, accountants, architects, technology consultants, real estate agents — and a critical risk that insurance intermediaries themselves must manage, since brokers, agents, and MGAs face E&O exposure every time they advise a client, place a policy, or handle a claim. The coverage is sometimes referred to as professional indemnity (PI) insurance, particularly in the United Kingdom, Australia, and other markets outside the United States.

🔧 E&O policies are typically written on a claims-made basis, meaning they respond to claims first reported during the policy period regardless of when the underlying error occurred, subject to any applicable retroactive date. This structure contrasts with occurrence-based coverages and creates important nuances around continuity of coverage and the purchase of extended reporting period ("tail") endorsements when a policy is not renewed. Coverage usually includes both defense costs and indemnity payments up to the policy limit, though whether defense costs erode or sit outside the limit varies by policy form and jurisdiction. For insurance intermediaries specifically, regulators in most major markets — including the FCA in the UK, state insurance departments in the U.S., and the MAS in Singapore — mandate minimum E&O coverage as a condition of licensing, recognizing that a broker's failure to secure appropriate coverage for a client can result in devastating financial harm.

⚡ The E&O line has grown in strategic importance as professional services become more complex, regulatory environments more demanding, and clients more willing to litigate over perceived advisory failures. For insurance carriers underwriting E&O risks, the challenge lies in assessing the quality of a firm's internal controls, training, supervision, and documentation practices — softer factors that heavily influence loss frequency and severity. Emerging areas of E&O exposure include technology professionals' liability for software failures or data breaches (often blending into cyber territory), financial advisors' liability under evolving fiduciary standards, and the growing scrutiny of insurance intermediaries who place coverage through delegated authority arrangements where errors can affect hundreds or thousands of policies. As the professional economy expands globally and the standard of care expected of service providers rises, E&O insurance remains an indispensable commercial line and a cornerstone of professional risk management.

Related concepts:

• Definition:Professional liability insurance
• Definition:Claims-made policy
• Definition:Cyber insurance
• Definition:Directors and officers liability insurance (D&O)
• Definition:Broker
• Definition:Duty of care