South Carolina's Split Mandate
You're reviewing your South Carolina auto insurance policy and see both uninsured motorist and underinsured motorist coverage listed. You know the state requires uninsured motorist coverage — it's mandatory at the same $25,000 per person / $50,000 per accident bodily injury limits as liability. But you're not sure whether underinsured motorist coverage is also required, or whether you can decline it to lower your premium.
South Carolina mandates uninsured motorist coverage but treats underinsured motorist coverage differently. Carriers must offer underinsured motorist coverage at the same limits as your uninsured motorist coverage, but you can reject it in writing. That rejection applies to every vehicle on your policy. The distinction matters when you're insuring multiple vehicles — declining underinsured on one car declines it for all cars on the same policy.
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Get Your Free QuoteSC Uninsured Motorist Rate
10.3%
One in ten South Carolina drivers carries no insurance. Uninsured motorist coverage protects you when an at-fault driver has no policy; underinsured motorist coverage protects you when their limits are too low to cover your damages.
Insurance Information Institute, 2023
What Uninsured and Underinsured Motorist Coverage Actually Do
Uninsured motorist coverage pays your medical bills, lost wages, and pain-and-suffering damages when an at-fault driver has no insurance. South Carolina requires it at $25,000 per person / $50,000 per accident for bodily injury. You cannot reject this coverage — it's mandatory on every policy.
Underinsured motorist coverage pays the gap when an at-fault driver's liability limits are too low to cover your damages. South Carolina law requires carriers to offer underinsured motorist coverage at the same limits as your uninsured motorist coverage, but you can reject it by signing a written waiver.
The two coverages work in sequence. Uninsured motorist coverage applies when the at-fault driver has no policy at all. Underinsured motorist coverage applies when the at-fault driver has a policy but their limits are exhausted. Both protect you and your passengers; neither protects the other driver or pays for vehicle damage.
Rejecting underinsured motorist coverage removes protection across every vehicle on your policy. You cannot decline it for one car and keep it for another.
How to Reject Underinsured Motorist Coverage in South Carolina
The rejection form names the coverage being declined, states the limits you are rejecting, and confirms that you understand the protection you are giving up. Most carriers include the rejection form in your initial policy documents or at renewal. If you do not sign and return the form, the coverage remains on your policy and you pay the premium for it. South Carolina law does not permit verbal rejection or rejection by failing to pay — the rejection must be in writing.
Once you reject underinsured motorist coverage, the rejection applies to every vehicle on the policy and remains in effect until you request the coverage again in writing. Adding a vehicle to the policy does not automatically reinstate underinsured motorist coverage. If you later decide you want the coverage back, contact your carrier and request it — most carriers will add it at your next renewal or mid-term with a policy endorsement.
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Why Households with Multiple Vehicles Keep Underinsured Motorist Coverage
When you insure two or more vehicles on one policy, rejecting underinsured motorist coverage removes protection for every driver and every vehicle. A household with three cars and four drivers faces higher exposure than a single-car household — more trips, more drivers, more time on the road. Without it, you pay out of pocket or pursue the at-fault driver personally, which often recovers nothing.
South Carolina's uninsured motorist rate is 10.3 percent. Roughly one in ten drivers on the road has no insurance. Many more carry only the state minimum liability limits, which are quickly exhausted in a serious collision. Underinsured motorist coverage costs less than collision or comprehensive coverage and protects against a common risk — an at-fault driver with inadequate limits.
If your household's combined medical expenses, lost wages, or long-term care needs would exceed $25,000 per person in a serious collision, underinsured motorist coverage is the only protection that pays the gap. Rejecting it to save premium makes sense only when your household can absorb a five- or six-figure uncovered loss without financial hardship.
SC Minimum Liability Limits
$25,000 / $50,000
South Carolina requires $25,000 per person and $50,000 per accident in bodily injury liability, plus $25,000 in property damage liability. Many at-fault drivers carry only these minimums, leaving you underinsured if your damages exceed their limits.
South Carolina Department of Motor Vehicles
Stacking and Limits Across Multiple Vehicles
South Carolina does not permit stacking of uninsured or underinsured motorist coverage across multiple vehicles on the same policy. If you carry $50,000 per person in underinsured motorist coverage and insure three vehicles, your maximum recovery per person is still $50,000 — you do not multiply the limit by the number of vehicles. Stacking is prohibited by state law.
You can, however, purchase underinsured motorist coverage at limits higher than your uninsured motorist coverage if your carrier offers it. Some carriers allow you to buy underinsured motorist coverage up to your liability limits. Higher underinsured limits cost more but provide more protection when the at-fault driver's policy is exhausted. Compare the premium difference and decide whether the additional coverage justifies the cost for your household's risk tolerance.
Compare Carriers That Write Multiple Vehicles in South Carolina
Underinsured motorist premium varies by carrier, and the difference compounds when you insure multiple vehicles. Carriers that write policies for households with two or more cars in South Carolina include State Farm, Geico, Progressive, Allstate, Nationwide, Travelers, and USAA. Each prices underinsured motorist coverage differently, and each applies the multi-car discount to the total premium in its own way. A carrier with a lower base rate and a smaller multi-car discount can produce a lower total premium than a carrier with a higher base rate and a larger discount.
Request quotes from at least three carriers that write your household's vehicles. Confirm that each quote includes uninsured motorist coverage at the state-required $25,000 / $50,000 limits and ask whether underinsured motorist coverage is included or rejected. Compare the total premium with and without underinsured motorist coverage to see the actual cost difference. The gap is often smaller than drivers expect, especially when spread across multiple vehicles on one policy.