What E&O actually covers
Professional liability — errors and omissions, or E&O — responds to claims that your professional service, advice or work product caused a client a financial loss. No physical injury, no property damage: pure economic harm.
Typical triggers include negligent advice, a missed deadline that costs a client money, a design or specification error, failure to deliver promised services, a misstatement in a report, and breach of a professional duty of care. Coverage generally includes defense costs, settlements and judgments.
It is required or expected in a long list of fields: architects and engineers, accountants and bookkeepers, lawyers, insurance and real estate brokers, IT consultants and software developers, marketing and design agencies, management consultants, and staffing firms. In healthcare the same concept is called medical malpractice, and it is a distinct market with its own rules.
What it does not cover: bodily injury and property damage (general liability), employee injury (workers comp), employment claims (EPLI), intentional wrongdoing or fraud, and typically the cost of redoing the work itself as opposed to the client's consequential loss.
Claims-made: the mechanic that decides everything
General liability is normally occurrence-based: it covers incidents that happen during the policy period, whenever the claim arrives. Professional liability is normally claims-made: it covers claims first made against you during the policy period, and only for work performed on or after the policy's retroactive date.
Three consequences follow, and each one is a common and expensive mistake.
1. Your retroactive date is an asset. If you have been continuously insured since 2019, your retro date should still say 2019 today. If a new insurer resets it to the current year to cut the premium, every piece of work you did in the intervening years becomes uninsured. Check the retro date on every renewal and every carrier change.
2. Gaps are permanent. Let the policy lapse for a month and you generally cannot buy back coverage for work done before the gap. There is no retroactive repair.
3. Ending the policy ends the protection. When you retire, sell the business, or switch to a different structure, claims arriving afterward have no policy to report to — unless you buy tail.
Tail coverage
Tail coverage, formally an extended reporting period (ERP), lets you report claims after the policy ends, for work performed before it ended. It does not extend the period in which you can do covered work; it extends the window for reporting claims.
Practical points:
- It is typically priced as a one-time payment of 100% to 300% of the expiring annual premium, depending on the length — one year, three years, or unlimited.
- The right to purchase it is usually written into the policy, and often must be exercised within a short window after expiry — commonly 30 to 60 days.
- Professions with long claim tails — design, accounting, healthcare — usually need a long or unlimited ERP.
- An alternative to buying tail is having your next insurer accept your existing retroactive date, which achieves the same result while you remain in practice.
If you are selling a business or leaving a partnership, whose obligation it is to buy tail is a negotiable point that should be settled in writing before closing, not after a claim.
Reading the policy
Defense inside or outside the limit. Most E&O policies pay defense costs within the limit, meaning legal fees erode the money available for settlement. A $1 million limit that spends $400,000 on defense leaves $600,000. Confirm which structure you are buying.
Consent to settle and the hammer clause. Many policies require your consent to settle. A "hammer clause" caps the insurer's liability at the amount of a settlement you refused, leaving you responsible for the excess if the case goes worse. Softened versions — 50/50 or 70/30 sharing — are available and worth asking for.
Definition of professional services. This clause defines the entire scope of coverage. If it describes services you no longer perform, or omits a line of business you have added, claims from the omitted work are not covered. Update it when your business changes.
Prior knowledge exclusion. Circumstances you knew about before inception that could reasonably lead to a claim are excluded. This is why the application asks, and why answering carelessly is dangerous.
Notice provisions. Claims-made policies require prompt notice, and many allow you to report a circumstance that might become a claim — which locks coverage into the current policy year even if the claim itself arrives later. Use it.
Setting limits
Base the limit on the size of the financial harm your errors could plausibly cause, not on your revenue. A bookkeeper serving businesses with eight-figure payrolls carries an exposure far larger than their own fees. Client contracts frequently set a floor of $1 million or $2 million, and enterprise agreements sometimes reach $5 million.
Deductibles on E&O are typically per claim rather than annual, and some policies waive or reduce them if a claim is resolved without payment. Ask whether that provision exists.
Finally, check whether the policy is admitted or surplus lines. Surplus lines carriers write many specialist professions and are perfectly legitimate, but their policies are not backed by state guaranty funds — worth knowing when comparing an unfamiliar carrier against a lower-priced one.
Frequently asked questions
Sources
Every figure above is drawn from the following publications. Links open on the publisher's own site.
- U.S. Small Business Administration — Get business insurance
- NAIC — Consumer insurance information
- Insurance Information Institute — Business insurance basics