Professional Liability (E&O) Insurance
When a client says your work cost them money, professional liability (E&O) pays for your defense and any settlement on a covered claim. Here is what it covers, what it costs and what to send for a quote.
What professional liability (E&O) covers
Professional liability, also called errors and omissions or E&O, answers a client’s claim that your work or advice cost them money: a bookkeeper’s reconciliation error that leads to tax penalties, a consultant’s vendor pick that stalls a rollout, a real estate agent who misses a disclosure, a designer whose drawings send a project back for rework. The policy pays for your defense and for a settlement or judgment, up to its limit, when the claim falls within its terms. None of those claims involve an injury or damaged property, which is why general liability leaves them alone.
Who carries it and what to tell us
Any business whose clients pay for its judgment carries this exposure: consultants, accountants and bookkeepers, real estate and insurance agents, lawyers, therapists, designers, IT firms and photographers. If a client contract names an E&O limit, the policy has to meet it. Tell us about the work and any insurance terms a client has sent:
- What services or advice does your business provide?
- Do client agreements specify liability limits?
- Do you already hold a professional liability policy?
Claims-made coverage and the retroactive date
Most E&O policies are claims-made: the policy that responds is the one in force when the client complains, not the one in force when you did the work. A retroactive date sets how far back covered work can reach, so keep it unchanged when you renew or move to a new insurer. When you retire, sell the practice or let the policy go, an extended reporting period, often called tail coverage, gives clients time to raise claims about past work. Our guide to occurrence vs. claims-made policies shows how the two forms differ.
What does professional liability (E&O) insurance cost?
As of 2026, published premium data from national small-business insurers puts E&O near $400 a year at the low end, with a typical California figure around $94 a month, about $1,130 a year. Another insurer reports that nearly three quarters of its customers pay $45 a month or less. Those buyers are mostly solo professionals and firms under five employees with limits around $1 million. Established firms with staff, larger revenue or higher-stakes advice commonly pay well above the median, and the published spread passes $7,000 a year. Those numbers summarize what insurers publish; they are not a Mithril1 quote.
Insurers rate E&O on the profession, annual revenue, headcount and the limit you buy. One rate-comparison site’s modeled national benchmark at $1 million per claim runs from about $35 a month with no employees to $60 for one to four, $87 for 10 to 19 and $105 for 20 to 49. The same source says moving to a $2 million limit adds $20 to $40 a month. For a 12-person firm, that is ($87 + $20) × 12 to ($87 + $40) × 12, or roughly $1,280 to $1,520 a year at the higher limit. For mortgage brokers, attorneys and real estate professionals buying $5 million, the same data shows premiums about doubling.
Work where one mistake can cost a client heavily carries a higher rate: engineers average about $144 a month in published data, against $42 for bookkeepers. Past client claims, a higher limit written into a client contract, a lower deductible and a retroactive date reaching further back all raise the premium. A clean claims history, written engagement letters that define your scope, documented review steps before work goes out, a higher deductible and a precise description of the services you actually provide keep it lower. Gather contracts, revenue and a list of services with the business insurance quote checklist, and start a quote through the contact page. The E&O savings guide goes further on scope letters, review steps and deductibles.
Professional liability by profession
Every profession has its own version of a professional mistake. For a lawyer it is a missed filing deadline, for an insurance agent a policy that was never placed, for a therapist a complaint to the licensing board, and for a massage therapist or personal trainer an injury during a session. The policy form, the limits clients expect and the underwriting questions all follow that difference.
For the details of each, read insurance for lawyers and law firms, insurance for insurance agents and agencies, insurance for therapists and counselors, insurance for massage therapists, insurance for personal trainers, and our guides for consultants, real estate businesses and photographers.
E&O and cyber: two different questions
E&O responds to the allegation that your professional work was wrong: a missed deadline, a flawed recommendation or an error in a report that cost a client money. Cyber insurance answers a different event entirely: a breach of the data you hold, a ransomware attack on your systems or a payment sent to a fraudster after a spoofed email.
Consultants, designers and real estate offices often need both, because they give advice and hold client records at the same time. A bookkeeper with access to client funds raises a third question, which a crime bond addresses.
What a claim looks like
A claim usually starts with a client who believes your work cost them money: a recommendation that did not deliver, a missed filing deadline, an error in a report or a project delivered late. The allegation is a mistake, an omission or negligence, and the policy pays to defend a covered claim even when the client turns out to be wrong.
That is why describing your services precisely matters. A business that writes reports, gives advice or manages projects for clients should explain exactly what it delivers, who relies on it and how the work is checked before it goes out.
Contracts that ask for E&O
Client contracts often name the professional liability limits they expect and ask for proof before work begins. Larger clients set the terms in a master service agreement: a minimum limit, notice before cancellation and sometimes an indemnity clause that shifts responsibility for mistakes onto you and reaches further than the policy does. Some ask for E&O and cyber by name, each with its own limit.
Our guide to insurance requirements in client contracts walks through those clauses, and the certificate of insurance guide explains how to provide proof of coverage.
Technology firms and AI products
Software, IT and AI companies carry a version of this policy called technology errors and omissions, which adds the network security and media claims that come with code and data. Our pages on insurance for IT and technology companies and insurance for AI companies cover those policies, including the new generative AI exclusions.
A few useful answers
Common questions
Is professional liability the same as E&O?
Yes. Errors and omissions, or E&O, is another name for professional liability insurance. The policy lists the professional services it covers, so describe yours exactly as you sell them.
Do I need general liability as well?
Most businesses with clients or a workspace carry both. Professional liability answers claims about your advice or services; general liability answers injuries and property damage, such as a client who trips over a cable in your office.
What helps when quoting professional liability?
A plain description of the services you sell, your business revenue and any client agreements that set liability limits. If you already carry a policy, bring that along too.
Which businesses usually ask about professional liability?
Consultants, real estate professionals, photographers, designers and other businesses that sell advice or expertise. If clients rely on your judgment, it is worth discussing.
What should I bring if a client contract asks for E&O?
Bring the contract’s insurance section and a description of the services it covers, so we can review the limits it names with you.
What should I ask about work completed before buying a policy?
Ask how the policy treats services you performed before it began, especially when you are moving from another policy.