Is stacked UM worth the higher premium for SC hit-and-runs?

The 25/50 versus 50/100 bodily-injury comparison is only part of the hit-and-run math. Ask each insurer how UM property damage works in South Carolina, including its limit, deductible, and how it coordinates with collision coverage for the same loss.

Stacked UM bodily-injury limits may improve injury protection, but they do not by themselves answer how damage to the vehicle would be paid. That could matter more than the headline premium after a hit-and-run.

For each quote, request these figures in writing:

- UM property-damage limit and deductible
- Collision deductible
- Whether UM property damage is available for an unidentified-driver claim
- How the insurer handles a claim when both UM property damage and collision could apply
- Whether stacking changes any property-damage protection when there is more than one insured vehicle

Stacked 50/100 may be worthwhile for frequent highway driving or teen drivers, but it is hard to compare the options fairly until the vehicle-damage coverage is clear.

The unidentified-driver question deserves its own line in the quote comparison. Ask whether the insurer requires physical contact with the vehicle, or whether independent evidence such as a witness, dashcam, police report, or nearby video can establish the hit-and-run.

A policy can show attractive UM limits and a reasonable deductible, then become much less useful if a no-contact incident is excluded or difficult to prove. I’d also ask whether the physical-contact rule applies specifically to UM property damage, bodily injury, or both. That distinction could matter more than the premium difference for a minor sideswipe where the other driver disappears.

Skye’s point about separating a no-contact rule for property damage from bodily injury is important. I’d add one more line to the quote checklist:

- Does UM/UIM bodily-injury coverage protect passengers, resident relatives, and other permissive occupants?
- If an injured passenger has their own auto policy, does that policy pay first, or can the vehicle’s UM coverage respond directly?
- If there are multiple household policies, how do they coordinate, and is stacking allowed for that person’s claim?
- Are exclusions different for a resident relative who doesn’t own or insure a vehicle?

That can change the practical value of 25/50 versus 50/100. A household with several regular passengers may have more exposure than the named driver alone, while a policy that looks adequate on the declarations page could have coordination rules that limit what’s actually available. I’d want the insurer to explain the order of payment in writing, not just quote the bodily-injury limits.

The coordination rules for passengers are worth getting in writing, especially if the household has more than one vehicle. I’d add one question to the quote comparison: can the policyholder reject or choose lower UM/UIM limits separately for each vehicle, or does the selection apply across the whole policy?

That could change both the premium and the practical value of stacking. A second vehicle with lower limits, or a vehicle excluded from stacking, might make the declarations page look stronger than the protection available for a particular claim. I’d ask the insurer to show the available limits and stacking result vehicle by vehicle, not just give one household total.

The vehicle-by-vehicle declarations page may still not show what a claim actually produces. Can the insurer provide a worked example for one injured person, using the household’s real vehicles and selected limits, showing the available stacked UM/UIM amount?

For example, if one vehicle has 25/50 and another has 50/100, I’d want the carrier to state whether the person’s applicable limit is 75/150, limited to the highest selected limit, or calculated another way under that policy. The example should also show whether a vehicle excluded from stacking changes the result.

For quote comparisons, ask the insurer to show the **net available recovery**, not just the theoretical stacked limit. The worksheet should identify whether the stacked UM/UIM amount is reduced by:

- The at-fault driver’s liability payment
- Payments from another applicable auto policy
- Any settlement or payment allocated to the same injury

That distinction matters because a stated 75/150 limit may be an upper ceiling rather than an additional amount paid on top of other insurance. A worked example should show the result before and after those offsets for one injured person using the household’s actual vehicles.

The collision question matters because UM property-damage coverage may not cover the full vehicle loss, depending on its limit and whether the hit-and-run meets the policy’s eligibility terms. Collision is another route for covered damage, with its own deductible, rather than relying on UM property damage to fill every gap.

I’d compare each option’s maximum payment and likely out-of-pocket cost with the vehicle’s value, then weigh that against collision’s premium. For an older car, the premium and deductible might outweigh the protection; for a higher-value vehicle, a UM limit or eligibility restriction could leave a more consequential gap. Does the insurer’s quote show those figures side by side for the same vehicle?