Don't Trust Your CGL for Defense: Why Claims-Made E&O Is Your Real Shield

Who This Is For

If you're a consultant, architect, engineer, tech professional, or any business that sells advice or services, this is for you. You've probably been told by an insurance agent or a well-meaning friend that a Commercial General Liability (CGL) policy is all you need. That's wrong. I'm here to tell you that when a client sues you for a mistake in your work, your CGL will likely not pay a dime. And that's not just my opinion—it's how the insurance industry is structured. Let me walk you through the gritty reality of claims and defense.

Step 1: Understand the Two Worlds of Liability

There are two fundamentally different types of liability insurance, and they operate in different universes. General liability (CGL) covers bodily injury and property damage—think a customer slipping on your office floor or a product you sold catching fire. Professional liability, also called errors and omissions (E&O), covers financial losses from your professional mistakes—like giving bad advice or missing a deadline in your contract. (The Hartford) If you provide a service that involves expertise, you need both. But here's the catch: they don't just cover different risks; they handle claims in completely different ways.

Step 2: Know the Claim-Made Trap

Here's where most business owners get blindsided. Professional liability policies are typically written on a claims-made basis, not occurrence like a CGL. (IRMI) That means you're only covered if the claim is reported during the policy period—and the incident must happen after a specific date called the retroactive date. (The Hartford) If a client sues you in 2026 for something you did in 2024, and you didn't have E&O coverage in 2026, you're out of luck. Even if you had the policy back in 2024, if it wasn't claims-made, it won't respond. This is a critical difference that can leave you exposed if you let your coverage lapse or switch carriers without an extended reporting period.

Step 3: Check Your Defense Costs

Now, let's talk about money. When a claim comes in, you need a lawyer. With a CGL, defense costs are usually paid on top of your policy limit—so a $1 million policy might actually pay $1 million in damages plus your legal fees. (IRMI) But with professional liability, defense costs are typically included within the policy limit. (IRMI) That means if you have a $1 million limit and your defense costs eat up $300,000, you only have $700,000 left to settle or pay a judgment. This is a huge deal. You could burn through your entire policy on attorney fees alone, and the other side knows it. They'll push for a settlement early, knowing you're under pressure.

Step 4: Don't Skimp on Limits—Here's What It Costs

So what should you buy? For professional liability, common limits start at $1 million per claim, but for larger projects you might need $2 million to $5 million or more. (IRMI) The cost? The Hartford's average monthly premiums for professional liability range from $38 for healthcare professionals to $146 for tech companies, and $239 for architects and engineers. (The Hartford) That's not chump change, but compare it to the potential cost of a single lawsuit: attorney fees alone can run from $3,000 to $150,000, and settlements can reach into the millions. (The Hartford) I'd rather pay a few thousand a year than face a six-figure legal bill.

Step 5: Watch Out for Exclusions and Gaps

Here's what can go wrong: you think you're covered, but you're not. E&O policies do not cover intentional misconduct, fraud, or criminal acts. (Cornell Law School Wex) And they don't cover bodily injury—that's what your CGL is for. (The Hartford) So if a client slips in your office while discussing a deal, your E&O won't help. But if you give them bad tax advice and they lose money, your CGL won't help. You need both. And don't assume your umbrella policy will save you. A commercial umbrella extends the limits of certain underlying policies, like CGL and auto, but it doesn't extend to property claims or everything under the sun. (The Hartford) You have to know what's underneath.

What I'd Actually Do

Here's my advice, plain and simple: buy a professional liability policy with at least a $1 million per claim limit, and make sure you understand the retroactive date. If you're in a high-risk field like medicine, consider higher limits—remember, nearly 60% of OB/GYNs have been sued at least once. (Insurance Journal) And don't let your policy lapse, even for a day. If you switch carriers, negotiate an extended reporting period (often 30-60 days, but you can buy longer) to cover claims that arise after your old policy ends. (The Hartford) Finally, if you have a CGL, check your defense costs—if they're included within the limit, consider raising your limit or buying a separate defense policy. The last thing you want is to be underinsured when a claim hits. Trust me, you'll sleep better at night.

Sources

• IRMI - https://www.irmi.com/articles/expert-commentary/contractors-professional-liability-and-the-cgl
• The Hartford - https://www.thehartford.com/professional-liability-insurance
• The Hartford - https://www.thehartford.com/errors-omissions-insurance
• Cornell Law School Wex - https://www.law.cornell.edu/wex/errors_and_omissions
• Insurance Journal - https://www.insurancejournal.com/news/national/2026/04/29/867519.htm