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. The insurer's duty to defend requires it to provide a legal defense even for groundless claims, triggered the moment the claim is tendered — not after coverage is confirmed. 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.