South Dakota Requires Uninsured Coverage, Not Underinsured
South Dakota law mandates uninsured motorist coverage on every auto insurance policy but does not require underinsured motorist coverage. You must carry uninsured motorist protection at the same limits as your liability coverage unless you reject it in writing. Underinsured motorist coverage, by contrast, is optional from the start.
The distinction matters because many drivers assume both coverages are mandatory or that rejecting one means rejecting both. Uninsured motorist coverage pays when the at-fault driver has no insurance. Underinsured motorist coverage pays when the at-fault driver carries liability limits below your medical bills and repair costs. South Dakota treats them as separate decisions.
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Get Your Free QuoteSouth Dakota Uninsured Motorists
9.4%
Nearly one in ten drivers on South Dakota roads carries no liability insurance, making uninsured motorist coverage the primary protection against collision with an uninsured driver.
Insurance Information Institute, 2023
What Uninsured Motorist Coverage Does
Uninsured motorist coverage pays your medical bills, lost wages, and vehicle damage when a driver with no insurance hits you. South Dakota requires carriers to offer this coverage at limits matching your liability policy. If you carry $25,000 per person and $50,000 per accident in liability, your uninsured motorist coverage starts at the same limits.
You can reject uninsured motorist coverage, but only in writing. The carrier must provide a rejection form, and you must sign it. Without that signed rejection, the coverage stays on your policy and you pay the premium. Most households keep it because the uninsured rate in South Dakota sits near 9.4%, meaning roughly one in ten drivers you encounter has no coverage to pay your claim.
Uninsured motorist coverage also applies in hit-and-run accidents where the at-fault driver flees and cannot be identified. Your own policy steps in to cover the damage the phantom driver caused.
Underinsured motorist coverage is optional in South Dakota. You can decline it without signing a rejection form, and many policies do not include it unless you request it.
How Underinsured Motorist Coverage Works
South Dakota's minimum liability requirement is $25,000 per person for bodily injury. Underinsured motorist coverage pays that difference, up to your policy's underinsured limits. Without it, you pursue the at-fault driver personally for the unpaid balance, which often proves uncollectible.
Underinsured coverage is not automatic. Carriers must offer it, but you can decline without a written rejection. Many drivers skip it to lower premiums, not realizing that minimum-limit policies are common. A household insuring multiple vehicles may find underinsured coverage more valuable because a single serious accident can exceed minimum limits quickly, leaving every vehicle and driver in the household exposed to the gap.
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Rejection Rules and Policy Structure
South Dakota law requires carriers to offer both uninsured and underinsured motorist coverage when you buy a policy. For uninsured coverage, you must sign a written rejection to remove it. For underinsured coverage, no rejection form is required; the carrier can issue a policy without it if you do not request it.
When you insure multiple vehicles on one policy, the uninsured and underinsured motorist coverages apply per accident, not per vehicle. If your policy carries $50,000 per accident in underinsured coverage and two of your cars are involved in the same collision with an underinsured driver, the $50,000 limit covers both vehicles combined. Splitting coverage across separate policies for each vehicle does not increase the per-accident limit unless you buy higher limits on each policy.
Households that reject underinsured coverage to save premium often regret the decision after a serious accident. The cost difference between uninsured-only and uninsured-plus-underinsured coverage is typically modest, but the financial exposure when an at-fault driver carries only $25,000 in liability can be severe.
South Dakota Minimum Liability
$25,000 / $50,000 / $25,000
South Dakota requires $25,000 per person, $50,000 per accident for bodily injury, and $25,000 for property damage. Many drivers carry only these minimums, leaving underinsured gaps when costs exceed limits.
South Dakota Department of Public Safety
Comparing Carriers and Coverage Options
Not every carrier prices uninsured and underinsured motorist coverage the same way. Some bundle both coverages at a single combined premium; others price them separately. When you request quotes for multiple vehicles, ask each carrier to break out the cost of underinsured coverage so you can compare the gap-protection value against the premium increase.
Carriers writing policies in South Dakota include State Farm, Progressive, Geico, Allstate, Farmers, and USAA, among others. Each offers uninsured motorist coverage as required by law, and each must offer underinsured coverage, but the pricing and the ease of adding it to a multi-vehicle policy vary. Some carriers default to including underinsured coverage unless you decline; others require you to opt in.
Next Step: Review Your Current Policy
Check your declarations page to confirm whether your policy includes underinsured motorist coverage. If it does not, contact your carrier or agent to request a quote for adding it. Compare the premium increase against the financial risk of a gap when an at-fault driver's limits fall short. For households insuring multiple vehicles, the per-accident structure of underinsured coverage makes it especially valuable, because a single serious collision can involve more than one car and exceed minimum limits quickly.