Why Your CGL Won't Cover a Client's Lost Millions

Forty-five percent of physicians over 55 have been sued, according to the Insurance Journal. But you don't need a medical degree to face a professional liability claim. Imagine you're a small IT consultant. You sign a contract to upgrade a client's network. You make a mistake—a config error that costs the client $200,000 in lost sales. They sue you for negligence. Your CGL? It won't pay a dime. That's not a scare tactic; it's how liability policies are built.

The Setup: You Think You're Covered

Most small businesses buy a Commercial General Liability (CGL) policy because clients demand it. The standard limit is $1,000,000 per occurrence and $2,000,000 aggregate (IRMI). Your contract likely requires that. But here's the catch: CGL covers bodily injury and property damage—physical risks. It does not cover financial losses from your professional errors. That's what professional liability insurance, also called errors and omissions (E&O), is for.

The Claim: A Client's Lost Revenue

Your client sues, claiming your mistake caused them $200,000 in lost revenue. They also demand your attorney fees, which can run $3,000 to $150,000, plus court costs and settlements that can reach millions (The Hartford). Your CGL insurer reviews the claim and denies coverage. Why? Because it's a financial loss from professional services, not property damage. You're on the hook for defense and any judgment.

The Difference: Physical vs. Financial

General liability covers bodily injury and property damage; professional liability covers financial losses from errors and omissions (IRMI). That's the core split. Your CGL is for the slip-and-fall in your office, the damage your employee causes to a client's hardware. Professional liability is for the advice you gave that cost a client money. They're not interchangeable.

The Policy Mechanics: Occurrence vs. Claims-Made

There's another trap. CGL is usually occurrence-based: if the incident happens during the policy period, you're covered even if the claim comes later. Professional liability is usually claims-made-and-reported (IRMI). That means you're covered only if the claim is made and reported while the policy is active—or within an extended reporting period, typically 30 to 60 days, extendable for a fee (The Hartford). If you let your policy lapse and a claim comes in six months later, you're uncovered.

The Real Cost: What You Should Buy

Professional liability isn't cheap, but it's not outrageous. The Hartford's average minimum monthly premiums include $62 for miscellaneous standalone coverage, $146 for technology-company E&O, and $239 for architects and engineers. Compare that to the average CGL cost of $810 a year (The Hartford). You might think, "I can't afford both." But can you afford a $150,000 attorney bill? Or a $2 million settlement? The math is clear.

How to Compare Policies Like a Pro

When you compare quotes, look beyond the premium. Check the policy limits: professional liability limits commonly start at $1,000,000 per claim, with higher limits up to $5,000,000 (IRMI). Understand the retroactive date: it determines when coverage begins for past incidents (The Hartford). And know the exclusions: E&O doesn't cover intentional misconduct, fraud, or criminal acts (Cornell Law).

The Bottom Line

If you provide any professional service—consulting, design, IT, healthcare—you need both CGL and professional liability. The CGL won't save you from a client's lost millions. The only thing that will is a policy that covers your professional mistakes. Don't learn that lesson the hard way.

Sources

• IRMI - https://www.irmi.com/articles/expert-commentary/contractors-professional-liability-and-the-cgl
• 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 (General Liability) - https://www.thehartford.com/general-liability-insurance
• Cornell Law School Wex (Errors and Omissions) - https://www.law.cornell.edu/wex/errors_and_omissions
• Insurance Journal - https://www.insurancejournal.com/news/national/2026/04/29/867519.htm