How to Compare Liability Policies: CGL vs. Professional Liability, and Why You Need Both

Imagine you're a consultant who just wrapped up a project for a client. Six months later, they claim your advice cost them $200,000 in lost revenue. Your general liability policy—the one your client's contract demanded—sits in a drawer, and you're about to file a claim. But here's the catch: your CGL doesn't cover professional mistakes. It covers slips, falls, and property damage, not errors in your advice. You're on the hook for the full amount, plus legal fees. That's the gap between general liability and professional liability, and it's a gap that can bankrupt you.

So, how do you compare liability policies and know which ones you actually need? The answer isn't to pick one or the other—it's to understand what each covers, how they respond to claims, and why carrying both is the only way to build a solid defense. Let's dig into the specifics.

What Does Each Policy Actually Cover?

Start with the basics. General liability insurance, often called CGL, protects your business from third-party claims of bodily injury or property damage. That includes a customer slipping on your wet floor, a product that malfunctions and injures someone, or damage you cause to a client's property. It also covers personal and advertising injury, like libel or slander, and it pays for legal fees, judgments, and settlements up to your policy limits (The Hartford, General Liability).

Professional liability, on the other hand, is a completely different beast. Also called errors and omissions (E&O) insurance, it covers financial losses that arise from mistakes in the professional services you provide. If you're an architect, an IT consultant, or a healthcare provider, this policy kicks in when a client claims your advice or work was negligent, misleading, or simply wrong. It covers things like negligence, misrepresentation, inaccurate advice, and even copyright infringement (The Hartford, Professional Liability).

Notice the distinction: CGL handles physical risks, while professional liability handles abstract, financial ones. That's why most experts recommend carrying both. As The Hartford puts it, general liability covers bodily injury and property damage, while professional liability covers errors and omissions in services—and carrying both is recommended for full protection (The Hartford, Professional Liability).

Claims-Made vs. Occurrence: The Hidden Trap

Here's where most people get tangled. The way your policy responds to claims depends on whether it's occurrence-based or claims-made-based. General liability is usually occurrence-based, meaning that as long as the incident happened during your policy period, you're covered—even if the claim is filed years later (IRMI, The Hartford). That's nice and straightforward.

Professional liability, however, is typically written on a claims-made basis. That means you're only covered if the claim is made and reported while the policy is active. It also comes with a retroactive date and an extended reporting period. The retroactive date sets a cutoff: you're covered for incidents that happen on or after that date, but not before. And the extended reporting period—usually 30 to 60 days, but extendable for a cost—gives you a window to report claims after your policy ends (The Hartford, Professional Liability; The Hartford, Errors & Omissions).

Why does this matter? If you switch professional liability carriers, your new policy's retroactive date might not cover past work, leaving you exposed for claims on projects you did years ago. You might need to buy extended reporting coverage (often called "tail" coverage) to bridge the gap. That's a cost you need to factor into your comparison.

Defense Costs: Inside or Outside the Limit?

Another critical difference is how defense costs are handled. For general liability, defense costs are typically paid in addition to your policy limit. So if you have a $1 million per occurrence limit and your defense costs run $200,000, you still have the full $1 million available for settlements or judgments (IRMI). That's a huge advantage.

For professional liability, defense costs are commonly included within the limit. That means if you have a $1 million limit and your attorney fees eat up $300,000, you only have $700,000 left to pay a settlement. And attorney fees in E&O cases can be brutal—they average anywhere from $3,000 to $150,000, and settlements can range from a few thousand to millions (The Hartford, Errors & Omissions). So when you compare policies, don't just look at the limit; ask how defense costs are applied.

Umbrella Coverage: The Extra Layer You Might Need

Once you have your general and professional liability in place, you might consider an umbrella policy. Commercial umbrella insurance extends the limits of certain underlying policies, like general liability and commercial auto, giving you an extra layer of protection. It's broader than excess liability, which only extends limits on a single policy. Umbrella policies can have aggregate limits ranging from $1 million to $15 million (The Hartford, Commercial Umbrella).

But here's the catch: you can't buy umbrella coverage without an underlying policy. If you don't have general liability, you can't get a commercial umbrella. And umbrella policies don't extend to professional liability—they're designed for physical risks, not errors and omissions. So an umbrella won't fill the gap in your professional coverage.

Let's put numbers to this. The average cost of a general liability policy from The Hartford is about $810 a year, or $67 per month. A Business Owner's Policy (BOP), which bundles general liability and property, averages $1,687 a year. Professional liability premiums vary widely: for technology companies, E&O averages $146 a month; for architects and engineers, it's $239 a month; for healthcare professionals, just $38 a month (The Hartford, General Liability; The Hartford, Business Owner's Policy; The Hartford, Professional Liability). So you're looking at a combined cost that's manageable—often under $200 a month—for the essential layers.

Exclusions and Limits: Know What's Not Covered

Every policy has exclusions, and you need to know them before you buy. Professional liability doesn't cover intentional misconduct, fraud, or criminal acts. It also doesn't cover bodily injury—that's what your CGL is for (The Hartford, Professional Liability; Cornell Law School Wex, Errors and Omissions). General liability, on its own, won't cover professional errors. And umbrella policies don't extend to property claims—if your commercial property limits are exhausted, you're paying out of pocket (The Hartford, Commercial Umbrella).

Also, be aware of the limits. A common standard for CGL is $1 million per occurrence with a $2 million aggregate, and most client contracts require at least that much (IRMI). Professional liability limits typically start at $1 million per claim, but can go up to $5 million or more for larger projects (IRMI). When comparing, make sure the limits meet your contract requirements and your actual risk exposure.

Bottom Line

Don't fall into the trap of thinking one policy is enough. The smartest move is to carry both general liability and professional liability, tailored to your industry. Compare them not just on price, but on the claims-made vs. occurrence basis, how defense costs are handled, and the exclusions. And if you need higher limits, consider an umbrella—but only after your foundational policies are solid. Your client contract might only ask for a COI proving CGL, but your real protection comes from having both. That's the policy comparison that matters.

Sources

• IRMI - https://www.irmi.com/articles/expert-commentary/contractors-professional-liability-and-the-cgl
• The Hartford (General Liability) - https://www.thehartford.com/general-liability-insurance
• The Hartford (Professional Liability) - https://www.thehartford.com/professional-liability-insurance
• The Hartford (Errors & Omissions) - https://www.thehartford.com/business-insurance/errors-omissions-insurance
• The Hartford (Business Owner's Policy) - https://www.thehartford.com/business-insurance/business-owners-policy
• The Hartford (Commercial Umbrella) - https://www.thehartford.com/business-insurance/umbrella-insurance