Errors and Omissions (E&O) Insurance: Definition and How It Works

Errors and Omissions (E&O) insurance — also called professional liability insurance — is a type of liability coverage that protects individuals and businesses that provide professional services or advice against claims alleging that their work caused a client to suffer a financial loss due to a mistake, negligent act, or failure to perform the promised service. Unlike Commercial General Liability (CGL) insurance, which covers bodily injury and property damage caused by business operations, E&O specifically covers the professional services themselves — the advice given, the documents prepared, the work product delivered.

E&O is required or expected across a wide range of professions: insurance brokers and agents, CPAs and tax preparers, attorneys, architects, engineers, financial advisors, real estate agents, technology vendors, and consultants of all kinds. For insurance brokers specifically, carrying adequate E&O coverage is both a regulatory expectation and a practical necessity, given the frequency of coverage disputes and placement errors in the industry.

What E&O Covers

A standard E&O policy responds when a client alleges that the insured's professional error, omission, or negligent act caused the client a financial loss. Covered claims typically include:

• Errors in advice or recommendations: A CPA miscalculates estimated taxes; a broker places a policy with incorrect limits; an attorney misses a filing deadline
• Omissions: Failing to disclose a material fact, failing to recommend a necessary coverage, or failing to complete a required action
• Failure to perform: Not delivering a service that was promised or implied by the professional relationship
• Negligent misrepresentation: Providing inaccurate information that a client relied on to their detriment

E&O policies pay for: defense costs (attorney fees, expert witnesses, court costs), settlements, and judgments up to the policy limit. Defense costs may be included within the limit (reducing available coverage) or paid in addition to the limit — this distinction matters significantly in high-exposure professions.

What E&O Does Not Cover

E&O is not a blanket liability policy. Standard exclusions include:

• Intentional acts and fraud: Deliberate wrongdoing is not covered
• Bodily injury and property damage: These belong in a CGL or BOP policy
• Criminal acts: Professional liability does not cover criminal conduct
• Prior acts before the retroactive date: Claims arising from services rendered before the policy's retroactive date (on a claims-made form)
• Business disputes: Contract disputes where no negligence is alleged are generally not covered
• Cyber liability: Many standard E&O policies exclude data breaches; separate cyber coverage is typically needed

Claims-Made Policy Structure

Nearly all E&O policies are claims-made rather than occurrence-based. This means the policy that responds is the one in force when the claim is first made against the insured — not the policy in force when the error was committed.

Two policy dates are critical on a claims-made E&O policy:

• Retroactive date: The earliest date from which covered acts can trigger a claim. Errors committed before the retroactive date are not covered, even if the claim is filed while the policy is active.
• Extended Reporting Period (ERP) / Tail coverage: When a claims-made policy is cancelled or non-renewed, the insured can purchase a tail endorsement that extends the time period during which claims can be reported for acts that occurred while the policy was in force. Without a tail, gaps in coverage create serious exposure.

For the full mechanics of claims-made policies and how they compare to occurrence coverage, see Claims-Made Policy and Occurrence vs Claims-Made E&O Coverage.

E&O for Insurance Brokers

Insurance brokers face E&O exposure unique to their profession: coverage disputes, incorrect policy placements, failure to advise on available coverages, missed renewals, and errors in applications submitted to carriers. Common broker E&O claims involve:

• Placing a client in the wrong coverage tier, leaving a gap that becomes apparent only after a loss
• Failing to recommend a coverage (e.g., not offering cyber liability to a data-heavy client)
• Certificate of insurance errors that create additional insured disputes
• Misrepresenting coverage terms during the sales process

For guidance on how much E&O coverage a broker should carry — including per-claim limits, aggregate limits, and tail coverage considerations — see How Much E&O Coverage Should an Insurance Broker Carry?.

E&O vs General Liability

E&O and Commercial General Liability (CGL) cover different risks and are both typically required for professional service businesses:

Most professional service businesses need both. CGL protects against a client slipping and falling in your office; E&O protects against that same client suing you for bad advice. For the full comparison, see CGL vs Professional Liability (E&O).

Related Terms

• Claims-Made Policy — the policy structure used by virtually all E&O carriers; understanding retroactive dates and tail coverage is essential
• Occurrence Policy — the alternative policy trigger used for CGL and most property coverage; different from E&O's claims-made structure
• Additional Insured — frequently requested on CGL policies; distinct from the named insured protections on an E&O policy

How Insurance Brokers Use E&O in Practice

Brokers recommend E&O coverage in virtually every professional service client engagement. The key placement decisions are: (1) selecting appropriate limits based on the client's revenue, contract values, and professional exposure; (2) confirming the retroactive date protects all prior acts; (3) evaluating whether the policy includes or excludes defense costs from the limit; and (4) understanding the tail coverage options before a client changes carriers or retires. Brokers who advise clients to drop E&O to save on premium face their own E&O exposure if that client later suffers an uncovered professional liability claim.