Accountants E&O — Glossary
Professional Liability

Accountants E&O

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Definition. Accountants errors and omissions (E&O) insurance is professional liability coverage for CPAs, bookkeepers, and tax preparers that pays defense costs and damages when a client alleges financial harm from a mistake in tax, audit, or advisory work.

Also known as: Accountants Professional Liability, CPA E&O, Accountants Errors and Omissions

Accountants errors and omissions (E&O) is a form of professional liability insurance built for CPAs, bookkeepers, tax preparers, and financial advisory firms. It responds when a client claims that a negligent act, error, or omission in professional services caused them a financial loss, examples include a botched tax return that triggers IRS penalties, a missed audit disclosure, an erroneous financial statement relied on by a lender, or bad advice on a transaction. Coverage is almost always claims-made, and only acts occurring after the policy's retroactive date are covered.

This matters to a small accounting practice because the exposure is purely economic: no bodily injury or property damage occurs, so a general liability policy simply will not respond. A single reliance on a firm's numbers, by a client, an investor, or a bank, can generate a claim many times the size of the engagement fee. Most policies also fund the cost of defending the accountant even when the allegation is groundless, which is significant because regulatory inquiries and fee disputes frequently escalate into E&O claims.

A practical nuance: buyers should check whether the policy covers ancillary services the firm actually performs, such as bookkeeping, payroll, business valuation, or investment advice, since a form scoped only to "accounting" may exclude them. Because claims often arrive years after a return is filed, maintaining prior acts coverage when switching carriers and purchasing tail (extended reporting period) at retirement is essential to avoid an uninsured gap. Larger firms doing SEC-registrant audit work face steeper rating than firms handling small-business tax prep.

Example

A bookkeeper misclassifies deductible expenses on a small manufacturer's return, resulting in $85,000 of IRS penalties and interest; the client sues, and the accountants E&O policy pays the penalty exposure plus roughly $30,000 in defense costs.

Sources cited

  1. Professional Liability InsuranceInternational Risk Management Institute (IRMI) (2024)
  2. Glossary of Insurance TermsNAIC (2024)

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Disclosures

📘 Educational content only. Reviewed by licensed Property & Casualty insurance agent Jason Wootton (NPN 7694718). Not insurance advice, an individual recommendation, or a solicitation in any state. Insurance regulations vary by state. For specific coverage decisions, consult a licensed insurance agent in your state.
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