Errors & Omissions Insurance: A Plain-English Guide for Consultants

A few months ago, a consultant called me in a panic. One of their clients was claiming that a recommendation the consultant made — in writing, in a deliverable they'd been paid for — had cost the client $200,000 in lost revenue. The client's attorney had already sent a demand letter.

The consultant's first question: "Does my general liability cover this?"

The answer: no. General liability covers bodily injury and property damage. It does not cover claims arising from your professional advice, services, or work product. That's a completely different policy.

That's what Errors and Omissions insurance is for. And if you're a consultant, freelancer, or professional service provider of any kind, this is the post you should read before you need it.

What E&O actually covers

Errors and Omissions insurance — also called Professional Liability insurance — covers claims that arise from your professional services. Specifically:

Errors — you made a mistake in your work

Omissions — you forgot to do something you should have done

Negligence — a client claims your work fell below the professional standard

Misrepresentation — a client claims you promised something your work didn't deliver

E&O covers:

Legal defense costs — attorney fees, court costs, expert witnesses (these alone can exceed $100,000)

Settlements and judgments — what you owe if you lose or settle

Claims investigation — the cost of figuring out what happened

The key distinction: general liability covers physical harm. E&O covers financial harm caused by your professional work. They're different policies covering different risks. You probably need both.

Who needs E&O?

If your business involves giving advice, providing a professional service, or delivering work product that a client relies on to make decisions, you need E&O. That includes:

Consultants — management, IT, marketing, HR, operations

Accountants and bookkeepers

Architects and engineers

Real estate agents and brokers

Financial advisors and planners

Insurance agents (yes, we carry E&O on ourselves — I practice what I preach)

Technology companies — SaaS, custom software, IT services

Attorneys

Marketing and PR agencies

Freelancers and independent contractors in professional services

If someone pays you for your expertise and your expertise turns out to be wrong — or they claim it was wrong — E&O is what stands between you and a lawsuit you fund out of pocket.

E&O vs. general liability: the confusion that costs people money

This is the most common mistake I see with professional service businesses. They have a general liability policy and assume it covers everything.

Here's the difference:

General liability covers:

A client slips and falls in your office

You accidentally damage a client's property

Someone claims your advertising injured their reputation

E&O covers:

A client claims your consulting advice led to a bad business decision

A software bug in your product causes a client to lose data or revenue

You miss a deadline and the client loses a contract as a result

An accounting error costs a client money on their taxes

See the pattern? GL = physical harm and property damage. E&O = financial harm from professional services.

A client suing you because they tripped on your office rug? GL.

A client suing you because your recommendation cost them $500,000? E&O.

You need both. They don't overlap.

How E&O policies work

E&O policies are almost always written on a claims-made basis. This is different from general liability, which is typically written on an occurrence basis. The distinction matters:

Occurrence basis — covers incidents that happen during the policy period, regardless of when the claim is filed

Claims-made basis — covers claims that are filed during the policy period, as long as the incident happened after your retroactive date

What this means in practice: you need continuous, uninterrupted E&O coverage. If you let your policy lapse and a claim comes in later for work you did while covered, you may not have protection.

Key terms to understand:

Retroactive date — the earliest date for which your policy will cover claims. Ideally, this should go back to when you first purchased E&O coverage.

Extended reporting period (tail coverage) — if you cancel your policy or retire, tail coverage lets you report claims for a set period after the policy ends. Critical if you're closing your business or changing careers.

Prior acts coverage — covers work performed before the current policy period, back to the retroactive date.

What E&O typically costs

For a solo consultant or small professional services firm, E&O might cost:

$500–$1,500/year for a solo consultant with $1M/$1M limits

$1,500–$5,000/year for a small firm with a few employees

$5,000–$15,000+/year for larger firms or higher-risk specialties (tech, financial services, healthcare)

Factors that affect your premium:

Your profession and specialty

Your annual revenue

Number of employees

Claims history

Policy limits and deductible

The states where you operate

Compared to the cost of defending a single claim without insurance — which can easily hit six figures — E&O is one of the more affordable commercial coverages relative to the exposure it addresses.

The claims that catch people off guard

In my experience, the claims that surprise professionals the most aren't the dramatic failures. They're the gray areas.

"I did exactly what they asked me to do." Maybe. But if the client can argue that you should have warned them about a risk they didn't see — and you didn't document that conversation — you've got a claim.

"The project scope changed and they didn't tell me." Scope creep is a breeding ground for E&O claims. If the deliverable doesn't match the client's expectations because nobody documented the changes, you're exposed.

"They're just unhappy with the result." A dissatisfied client doesn't automatically have a valid claim. But defending yourself against even a frivolous claim costs money. E&O pays for that defense whether the claim has merit or not.

"It was a subcontractor's mistake, not mine." If you hired the sub, the client is coming after you. Your E&O may or may not cover subcontractor work — check your policy.

Five things to get right on your E&O policy

1. Adequate limits. Most professionals should carry at least $1,000,000 per claim / $1,000,000 aggregate. If your clients are large or your projects are high-value, consider $2M or more. Some clients and contracts will specify minimum limits.

2. Retroactive date. Make sure it goes back as far as possible — ideally to when you first started practicing. A gap in your retroactive date means old work isn't covered.

3. Defense costs inside or outside the limit. Some policies include defense costs within the policy limit (meaning legal fees eat into the money available for settlements). Others pay defense costs in addition to the limit. Outside-the-limit defense is better — but more expensive.

4. Contract-specific exclusions. Some E&O policies exclude claims related to specific types of work, guarantees of results, or contractual liability. Read the exclusions carefully.

5. Tail coverage availability. If you ever close your business or retire, you'll need tail coverage to protect against claims filed after the policy ends for work done while it was active. Know what your carrier charges for tail coverage before you need it.

What to do next

If you're a consultant, freelancer, or professional service provider and you're not sure whether your current coverage is right — or if you don't have E&O at all — here's what I'd suggest:

Check whether your existing GL policy has any professional liability coverage. (Spoiler: it probably doesn't, or it's very limited.)

Think about your largest client and your largest project. If something went wrong on that engagement, what's the potential financial exposure?

Send me a quick summary of what you do, who your clients are, and your annual revenue. I'll get you a quote and walk you through the options.

E&O isn't the most exciting insurance conversation. But it's the one that matters most when a client's attorney sends that demand letter — and you need to decide in the next 48 hours whether you're funding your own defense.

Zach Nadler is a 4th-generation insurance broker at Nadler Insurance in San Carlos, CA. Let's get your E&O sorted →

Errors and omissions insurance: a plain-English guide for consultants and professionals