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🚗 '''Underinsured motorist coverage''' is a provision within an [[Definition:Auto insurance | automobile insurance]] policy that pays the difference when a [[Definition:Policyholder | policyholder]] sustains damages exceeding the at-fault driver's available [[Definition:Liability insurance | liability limits]]. While [[Definition:Uninsured motorist coverage | uninsured motorist coverage]] addresses situations where the responsible party has no insurance at all, underinsured motorist coverage fills the gap when the other driver does carry a policy but its limits are too low to make the injured party whole. Many U.S. states mandate this coverage or require [[Definition:Insurance carrier | insurers]] to offer it, recognizing that minimum statutory [[Definition:Policy limit | liability limits]] often fall short of the actual costs of serious [[Definition:Bodily injury | bodily injury]] or extensive [[Definition:Property damage | property damage]].

⚙️ Claim activation depends on the relationship between the at-fault party's limits and the insured's own underinsured motorist limits. In most jurisdictions, the injured policyholder first exhausts the at-fault driver's liability coverage, and the underinsured motorist provision then responds up to its own stated limit — minus the amount already collected. Some states apply a "difference" method where only the gap is paid, while others use an "add-on" approach that stacks the insured's limits on top of the third party's payment. [[Definition:Stacking | Stacking]] rules can further multiply available limits when the policyholder insures multiple vehicles or holds more than one qualifying policy, although many carriers include anti-stacking [[Definition:Endorsement | endorsements]] where permitted by state law.

💡 For consumers, underinsured motorist coverage represents one of the most cost-effective upgrades to a standard auto policy, given the prevalence of drivers carrying only minimum liability limits. From the carrier's perspective, this coverage requires careful [[Definition:Actuarial analysis | actuarial pricing]] because claim severity can spike with medical inflation, and legal complexities around stacking and offsets vary markedly by jurisdiction. [[Definition:Insurance agent | Agents]] and [[Definition:Insurance broker | brokers]] who emphasize the value of adequate underinsured motorist limits help reduce the likelihood that their clients — and by extension the insurer's [[Definition:Claims department | claims operation]] — face protracted [[Definition:Subrogation | subrogation]] disputes or [[Definition:Litigation | litigation]] over shortfalls that a modest premium increase could have prevented.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Uninsured motorist coverage]]
* [[Definition:Auto insurance]]
* [[Definition:Stacking]]
* [[Definition:Bodily injury]]
* [[Definition:Liability insurance]]
* [[Definition:Personal injury protection (PIP)]]
{{Div col end}}

Definition:Underinsured motorist coverage - Revision history

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