Comparing Liability Policies: Why Your CGL Is Not Enough

Everyone tells you to get general liability insurance. And sure, it's the bedrock—but here's the contrarian truth: if you provide any kind of professional service, your commercial general liability (CGL) policy is not enough. In fact, it might be nearly useless for the most likely claim against you: a client who says your advice cost them money. That's a professional liability claim, and your CGL won't touch it. I've seen too many small businesses learn this the hard way. So let's bust some myths and compare the two policies you actually need.

What's the difference between general liability and professional liability?

General liability (also called commercial general liability, or CGL) covers physical risks: bodily injury and property damage. If a customer slips on your wet floor, your CGL pays. Professional liability, often called errors and omissions (E&O), covers financial losses from your professional mistakes—like giving bad advice or missing a deadline. As The Hartford puts it, general liability covers physical risks, while professional liability covers abstract risks like errors and omissions in your services. So if you're a consultant, accountant, or even a software developer, a slip-and-fall is not your biggest exposure; a client suing over a botched project is. That's a professional liability claim.

So do I really need both policies?

Yes. I can't stress this enough. The Hartford recommends carrying both for full protection, and I agree. Here's why: professional liability does not cover bodily injury claims—like a slip and fall—and general liability does not cover professional errors. They're complementary. Imagine you're an architect. A visitor trips at a construction site (general liability), and a client sues because your design flaw caused a wall to crack (professional liability). Without both, you're paying one of those out of pocket. The average cost of general liability from The Hartford is about $810 a year. That's a small price for physical-risk coverage, but it won't help you when a client alleges your error cost them $100,000. For that, you need professional liability.

What's this "claims-made" thing everyone talks about?

Most professional liability policies are written on a claims-made basis, which means they cover claims that are made during the policy period—not necessarily when the incident happened. That's different from general liability, which is usually occurrence-based, covering incidents that happen during the policy period even if the claim comes later. This distinction is critical. With claims-made, if you let your policy lapse, you lose coverage for future claims from past work. That's why you'll see a retroactive date and an extended reporting period. The retroactive date means you're covered for incidents that happen on or after that date. The extended reporting period is typically 30 to 60 days, but you can buy more time (up to a year or more) for an extra cost. If you switch carriers or retire, you need to think about tail coverage. This is one of the most misunderstood parts of liability insurance, and it can bite you if you're not careful.

Isn't an umbrella policy enough to fill the gaps?

No. An umbrella policy extends the limits of your underlying policies—like general liability and commercial auto—but it doesn't fill coverage gaps. Commercial umbrella insurance adds an extra layer of protection above existing policies; if you don't have an underlying general liability policy, you can't even get umbrella coverage. And it extends limits, not coverage. So if your CGL excludes professional errors, an umbrella won't cover them either. Excess liability is even narrower: it just raises the limit on one specific policy. So don't assume that a $1 million umbrella covers you for everything. It only kicks in after your underlying policy is exhausted. If you have a professional liability claim that your CGL doesn't cover, the umbrella won't help.

Does medical malpractice insurance follow the same rules?

Yes, but with higher stakes. Medical liability is a specialized form of professional liability, and the numbers are sobering. According to the AMA research reported by Insurance Journal, nearly 45% of physicians aged 55 and over have been sued, compared to just 11% of those under 45. That's a lifetime risk that's hard to ignore. And premiums are rising: in 2025, 36 states saw at least one medical liability premium increase, and 18 states had at least half of their reported premiums rise. California stands out because caps on non-economic damages keep premiums lower. So if you're a doctor, you're not just comparing CGL vs. E&O—you're looking at a market where the average claim can be millions. The lesson from medicine applies to all professionals: liability insurance isn't a luxury, it's a shield for your career.

Takeaway

Here's my blunt advice: if you provide any professional service, buy both general liability and professional liability. Don't rely on a CGL alone, and don't think an umbrella will save you. Understand the claims-made nature of professional liability and manage your retroactive date and extended reporting periods carefully. The cost of professional liability from The Hartford can be as low as $38 a month for healthcare professionals or $146 for tech companies—a fraction of what a lawsuit could cost you. And remember, a certificate of insurance is just proof of coverage; it doesn't create coverage. The real protection comes from having the right policies in place. So before you sign that contract, compare your policies and make sure you're covered for both physical and professional risks.

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 (Commercial Umbrella) - https://www.thehartford.com/business-insurance/umbrella-insurance
• Cornell Law School Wex (Liability) - https://www.law.cornell.edu/wex/liability
• Insurance Journal - https://www.insurancejournal.com/news/national/2026/04/29/867519.htm