The concept of adequate insurance protection rests on a deceptively simple question: how much coverage is enough? For decades, Canadian provincial and territorial legislatures have established mandatory minimum liability limits for motor vehicle insurance, creating a baseline requirement that ensures at least some level of financial responsibility among drivers. Yet these minimums, ranging from $200,000 in most provinces to $500,000 in Nova Scotia as of the date of authorship, were established at a time when the costs of catastrophic injury, sophisticated medical intervention, and long-term rehabilitation were dramatically lower than they are today. The gap between mandatory minimum coverage and the potential magnitude of modern accident claims has given rise to one of the most important but frequently misunderstood protections in the Canadian automobile insurance landscape: underinsured motorist coverage.
Understanding this coverage requires first appreciating why it exists at all. A motorist who carries only the provincial minimum liability insurance is complying with the law. They have met their statutory obligation and are permitted to operate a vehicle on public roadways. However, compliance with minimum standards does not equate to adequate financial protection for potential victims. Consider that a single catastrophic injury involving spinal cord damage, traumatic brain injury, or severe burns can generate economic losses and non-pecuniary damages exceeding several million dollars. When the at-fault driver carries only $200,000 in liability coverage, the injured party faces a devastating shortfall. The tortfeasor's insurance responds to its policy limit, but the victim's losses extend far beyond what that policy can satisfy. Without underinsured motorist coverage, the injured party would be left to pursue the at-fault driver personally for the deficiency—a remedy that proves illusory in most cases, as individuals carrying only minimum insurance rarely possess significant personal assets.