What Are Stacked Coverages in Auto Insurance
Stacked coverages in auto insurance let you combine the liability or uninsured-driver limits from more than one vehicle on your policy, creating a higher, combined limit that applies per accident. If you have two cars each with $50,000 in liability coverage and you stack them, you could have $100,000 available to pay a single claim.
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How Stacking Works
When you stack, you add the per-vehicle limits together rather than keeping them separate. The coverage usually applies per person and per accident, so a serious injury claim that exceeds one vehicle's limit can draw from the combined pool. Not all states allow stacking, and insurers may require you to buy coverage on every vehicle you want to include.
Types of Stacking
- Per-person stacking: combines limits for injuries to a single individual across your covered vehicles.
- Per-accident stacking: pools limits for all injuries in one crash, often providing the highest protection.
- Uninsured motorist stacking: stacks UM/UIM limits so they match your liability coverage or a chosen higher amount.
When Stacked Coverages Help
Stacking is most useful when you own multiple vehicles, live in a high-traffic area, or carry higher liability limits on one car than another. It also helps if you frequently carry passengers or drive vehicles with different coverage levels. In states that permit stacking, it can close gaps that leave you personally responsible for large claims.
Costs and Considerations
Stacking typically raises your premium because you are effectively increasing your total exposure. The exact cost depends on your insurer, state, and the limits you stack. Some insurers only allow stacking within a single policy, while others restrict it to household relatives. Before adding stacking, compare the premium increase against the extra protection it provides.
| Factor | Detail | Context |
|---|---|---|
| Availability | Not all states allow stacking | Check your state's laws and policy form |
| Premium impact | Usually increases cost | Varies by carrier and limit chosen |
| Vehicles covered | Typically all listed cars | Must be on the same policy |
| Claim trigger | Per accident or per person | Depends on stacking type selected |
Is Stacking Worth It
For many households with more than one vehicle, stacking offers a straightforward way to raise protection without buying an expensive umbrella policy. If you carry minimum limits, however, stacking those low limits may not provide enough help in a serious crash. Weigh the premium increase against your total assets and the likelihood of a large claim in your driving situation.