CG 21 39: Contractual Liability Limitation Explained

CG 21 39 is a commercial general liability endorsement that sharply narrows coverage for liability a business assumes in a contract. It does this by removing the broad business-contract category from the policy's definition of an insured contract. It is a limitation, not an absolute exclusion of every claim connected to a contract.

That distinction matters when a subcontract, lease, or service agreement contains an indemnity clause. The business may still owe the promised indemnity even when its CGL policy no longer treats that promise as an insured contract.

What does CG 21 39 change?

CG 21 39 replaces the normal insured contract definition with a shorter list. A 2025 federal court decision reproduced that shortened definition and identified the five remaining categories, but it did not include the broad sixth category used for tort liability assumed in ordinary business contracts.^[1] That missing category is often the one a contractor relies on when agreeing to indemnify an owner or general contractor for bodily injury or property damage.

The endorsement changes a defined term used by the policy's contractual liability exclusion. It does not erase all Coverage A protection. If the insured would have been liable for the injury or damage without the agreement, that independent liability can still fall outside the exclusion, subject to every other policy term.

Why is it different from an absolute contractual liability exclusion?

An absolute exclusion attempts to bar a broader class of contract-related liability. CG 21 39 works more narrowly by changing which agreements qualify as insured contracts. That technical route can still produce a serious uninsured indemnity obligation, but calling it an absolute exclusion overstates the form.

Public construction contracts treat the difference as material. Tampa International Airport's Airside D contract prohibits CG 21 39 while separately requiring additional insured and completed operations coverage.^[2] Those requirements are separate because contractual liability coverage does not make another party an additional insured, and additional insured status does not insure every indemnity promise.

What should a business owner check?

Start with the policy's forms schedule. If CG 21 39 appears, ask the broker to compare it against the indemnity and hold harmless sections of every major contract. A certificate of insurance will not show how the insured contract definition changed unless the attached endorsement is reviewed.

Then separate two questions. First, could the business face liability under tort law even without the contract? Second, did it promise to assume someone else's tort liability? Tarrant County contract documents prohibit CG 21 39 while describing the form as a restriction to liability that would exist without a contract.^[3] The answer depends on the actual contract, policy, facts, and governing law.

This guide is for educational purposes and summarizes standard ISO policy language in original words. Menlo Insurance Services is not affiliated with Insurance Services Office, Inc. Your policy's specific terms, conditions, and endorsements control. Talk to a licensed broker and legal counsel about your actual contracts and exposures.

The Bottom Line

CG 21 39 removes the broad insured contract category used by many indemnity agreements, but it is not a total ban on every contract-related claim. If it appears on a CGL policy, match the policy definition to the contract before the business accepts the indemnity obligation.