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In serious injury cases, the practical ceiling on what you recover is usually not the value of the claim — it is how much insurance exists. Stacking is one of the few ways to raise that ceiling.
The idea is straightforward: where more than one policy or vehicle carries coverage, combining the limits produces a larger pool.
Whether it is available depends on the policy language, which makes reading the declarations page far more important than most people realise.
Intra-policy stacking combines coverage across multiple vehicles on a single policy. Three cars each carrying $50,000 in UM coverage might yield $150,000 rather than $50,000.
Inter-policy stacking combines coverage across separate policies — for example, your own policy plus a policy under which you qualify as an insured, such as a resident relative’s.
Whether either is available turns on the policy wording and the circumstances, not on a general rule.
Georgia offers UM/UIM coverage in two forms, and the distinction is one of the most financially significant choices on an auto policy.
Add-on (excess) UM stacks on top of the at-fault driver’s liability coverage. If they carry $25,000 and you have $50,000 add-on UM, roughly $75,000 is potentially available.
Reduced (set-off) UM is reduced by the at-fault driver’s coverage. With $50,000 reduced UM against a $25,000 at-fault policy, only about $25,000 of your UM remains — a total of roughly $50,000.
Add-on typically costs modestly more and can be worth a great deal more. Most people do not know which they have.
Georgia’s minimum liability limits are low relative to what a serious injury actually costs. A single hospital stay with surgery can exhaust a minimum policy immediately.
When the at-fault driver carries minimums, your own UM coverage frequently becomes the primary source of meaningful compensation.
Identifying every applicable policy — yours, a resident relative’s, a vehicle owner’s, an employer’s if you were working — is often the single most valuable early step in a serious case.
Pull your declarations page rather than relying on memory. It states your UM limits and generally whether the coverage is add-on or reduced.
Check every vehicle on the policy, since intra-policy stacking depends on what each carries.
Consider household policies. Resident relatives can sometimes qualify as insureds under one another’s policies, which is a common source of overlooked coverage.
Sometimes — it depends on the policy language and the circumstances. Whether your UM is add-on or reduced is usually the more financially significant question, and both are shown on the declarations page.
Add-on UM sits on top of the at-fault driver’s liability coverage, increasing the total available. Reduced UM is offset by their coverage, so their policy consumes part of yours. Add-on typically costs modestly more and can be worth far more.
Pull the declarations page for every vehicle on the policy. Memory is unreliable here, and UM is easy to decline or under-select without registering it at the time.
Sometimes. Resident relatives can qualify as insureds under one another’s policies depending on the wording. It is a commonly overlooked source of coverage worth checking in any serious claim.
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