The moment a loss occurs, the relationship between an insured and their insurer shifts from one of abstract contractual promise to concrete financial obligation. It is precisely at this juncture that underinsurance reveals its full consequences. While the previous lessons in this course examined how coinsurance clauses function and why underinsurance develops over time, this lesson addresses what happens when inadequate coverage is discovered only after a loss has already occurred. For Canadian insurance professionals, claims adjusters, brokers, and risk managers, understanding this post-loss landscape is essential because the discovery of underinsurance during the claims process creates complex obligations, difficult conversations, and potential disputes that require both technical knowledge and professional judgment to navigate appropriately.
The legal framework governing the discovery of underinsurance after a loss draws from multiple sources across Canada. In common law provinces, the interpretation of insurance contracts follows well-established principles of contract law, supplemented by provincial insurance legislation. The Insurance Act of Ontario, the Insurance Act of Alberta, the Insurance Act of British Columbia, and equivalent statutes in Saskatchewan, Manitoba, and the Atlantic provinces each contain provisions addressing the adjustment of claims and the obligations of insurers when determining indemnity amounts. As of the date of authorship, these statutes generally require insurers to act in good faith when adjusting claims and to pay the amount to which the insured is entitled under the policy terms, which necessarily includes applying any coinsurance provisions that form part of the contract. In Quebec, the Civil Code of Quebec governs insurance contracts under articles 2389 through 2628, with specific provisions addressing property insurance and the principle of indemnity. Article 2493 of the Civil Code of Quebec explicitly addresses the situation where property is insured for less than its value, establishing the proportional indemnity principle that operates similarly to coinsurance clauses in common law jurisdictions, though with distinct civil law characteristics that practitioners in that province must understand.