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📋 '''Anti-stacking provision''' is a clause found in [[Definition:Insurance policy | insurance policies]] — most commonly in [[Definition:Automobile insurance | automobile]], [[Definition:Umbrella insurance | umbrella]], and [[Definition:Uninsured motorist coverage | uninsured/underinsured motorist]] coverages — that prevents a [[Definition:Policyholder | policyholder]] from combining or "stacking" the [[Definition:Policy limit | limits]] of multiple policies or multiple vehicles on a single policy to increase the total amount recoverable for a single [[Definition:Claim | claim]]. Without such a provision, an insured who carries the same coverage on three vehicles could potentially triple the available limit by aggregating all three. Anti-stacking provisions cap recovery at the limit of a single coverage unit, regardless of how many policies or covered items the insured holds.

⚙️ In practice, these provisions appear in the policy language itself and are reinforced — or sometimes overridden — by state statute. When a covered loss occurs, the [[Definition:Claims adjuster | claims adjuster]] evaluates whether the claimant is attempting to recover under more than one coverage section or policy. If an anti-stacking clause applies and is enforceable under the governing state's law, the insurer pays up to only one policy's limit. However, enforceability varies widely: some states permit stacking by statute and will void any policy language that restricts it, while others allow [[Definition:Insurance carrier | carriers]] to include anti-stacking language and will uphold it in court. This patchwork has generated extensive litigation, making anti-stacking provisions one of the more frequently contested policy terms in [[Definition:Personal lines | personal lines]] coverage disputes.

🏛️ From an [[Definition:Underwriting | underwriting]] and [[Definition:Product design | product design]] standpoint, anti-stacking provisions are essential tools for controlling [[Definition:Loss exposure | loss exposure]] and maintaining accurate [[Definition:Pricing | pricing]]. If insurers could not limit stacking, they would need to price each coverage unit assuming it could be combined with every other unit the policyholder owns — dramatically increasing [[Definition:Premium | premiums]] or forcing carriers to restrict multi-vehicle and multi-policy offerings. For [[Definition:Insurtech | insurtech]] companies building quoting engines and policy administration platforms, correctly applying anti-stacking rules by state is a non-trivial logic requirement that directly affects both the customer experience and regulatory compliance.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Policy limit]]
* [[Definition:Uninsured motorist coverage]]
* [[Definition:Other insurance clause]]
* [[Definition:Automobile insurance]]
* [[Definition:Personal lines]]
* [[Definition:Coordination of benefits]]
{{Div col end}}

Definition:Anti-stacking provision - Revision history

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