Uninsured motorist coverage rules in South Dakota

The driver who hit you was supposed to carry insurance. Plenty of people in South Dakota don't, or they carry the bare minimum, or they leave before you get a plate number. When that happens, the coverage that pays your medical bills and lost wages is usually your own. South Dakota builds these protections into every auto policy in ways that differ from most states, and the details decide how much you actually collect.

It's already in your policy, and you can't turn it down

South Dakota law requires uninsured motorist (UM) coverage on every auto liability policy issued for a vehicle registered or garaged in the state, snowmobiles aside. The coverage has to match your bodily injury liability limits.¹ A separate statute does the same for underinsured motorist (UIM) coverage: it must be included at a face amount equal to your bodily injury limits.²

Two things set South Dakota apart. First, there is no rejection form. Many states let you sign away UM or UIM in writing; South Dakota's statutes contain no such opt-out, so the coverage sits on every policy whether or not you thought to ask for it. Second, the law caps only what insurers are required to sell you. They don't have to provide UM or UIM above $100,000 per person and $300,000 per accident unless you request more, and you can request more.¹² Because both coverages track your bodily injury limits, raising your liability limits raises your UM and UIM at the same time.

Government-owned vehicles are the one carve-out. Policies covering them are not required to carry UM or UIM.¹²

What counts as "uninsured"

UM coverage reaches more than the driver with no policy at all. Under SDCL 58-11-9 it also covers hit-and-run vehicles, so if the other driver leaves the scene and can't be identified, you can still claim against your own UM coverage up to your UM limit.¹ It covers one more situation people rarely plan for: if the at-fault driver was insured but the insurer becomes insolvent and can't pay, that vehicle is treated as uninsured, and your UM coverage steps in.³

How underinsured coverage actually pays

UIM is for the crash where the other driver has insurance, just not enough to cover what you lost. Here is the part that catches people off guard. South Dakota uses an offset. Your UIM applies once your damages exceed the at-fault driver's liability limits, but the amount available is your UIM limit minus what that driver's liability insurer already paid.⁴

Run it on a minimum-limits crash. Say the driver who hit you carried the state minimum of $25,000 per person, and you carried a matching $25,000 in UIM. Your UIM available is $25,000 (your limit) less $25,000 (what their insurer paid). That's zero.⁴ Matching the other driver's limits leaves you with nothing to collect. To get real value from UIM in South Dakota, your UIM limit has to be higher than the limits carried by the driver who hits you. That is the single strongest reason to buy above the minimum.

You can't stack it, with one narrow exception

South Dakota is strict about stacking, and it spends three separate statutes saying so. You can't add your UM limit and your UIM limit together for one accident.⁵ You can't add up the UM limits across two or more cars on your policy.⁶ And you can't add up the UIM limits across multiple cars either.⁷ Insuring three vehicles does not triple your protection for a single crash.

The exception is worth knowing. If two separate drivers are at fault in the same wreck, one uninsured and one underinsured, you can recover under both your UM and your UIM coverage.⁵ That is the only time South Dakota lets the two combine.

The limits, and the gap the minimum leaves

South Dakota's minimum liability limits are 25/50/25: $25,000 for injury to one person, $50,000 per accident, and $25,000 for property damage.⁸ Because UM and UIM match your bodily injury limits, a minimum policy carries $25,000/$50,000 of each by default.¹²

One more provision can quietly shrink what you're counting on. South Dakota lets a policy exclude a specific named driver, or add a restrictive endorsement that reduces limits when a named person is driving. If the policy still gives that person any liability coverage, it can't fall below the chapter 32-35 minimum.⁹ Check who is and isn't covered before you assume the policy has you protected.

Fault, deadlines, and the claim itself

South Dakota is an at-fault state with no personal injury protection (PIP) requirement. Medical payments coverage is sold as an optional add-on, not something the law makes you buy.¹⁰ Fault runs on South Dakota's own slight-gross comparative negligence rule: you recover, reduced by your share, only if your negligence was "slight" next to the other driver's. That's a call for the jury, not a fixed percentage, so it can bar recovery even below 50%.¹¹

A UM or UIM claim is a claim against your own insurer under your contract, which changes how the process feels. Your insurer can be subrogated to what it pays you and pursue the at-fault driver in your place, and a liability insurer may pay out its limits without getting a full release first.¹² Read your policy for its own notice and lawsuit deadlines, and move early: the deadline to sue over the injuries is three years from the crash.¹³ Vehicle damage, including a diminished value claim, gets a longer six-year window.¹⁴ Pull the crash report and hold onto your medical records; both carry weight in a UM/UIM claim.

If your own insurer stalls or lowballs a claim on coverage you were required to carry, that's the moment to get advice. You can find an attorney who handles South Dakota UM and UIM disputes.

This is general information, not legal advice.

Sources

1. South Dakota Codified Laws § 58-11-9 (uninsured motorist and hit-and-run coverage; amount; government vehicles). https://sdlegislature.gov/Statutes/58-11-9

2. South Dakota Codified Laws § 58-11-9.4 (underinsured motorist coverage required; limits). https://sdlegislature.gov/Statutes/58-11-9.4

3. South Dakota Codified Laws § 58-11-9.1 (vehicle insured by insolvent insurer defined as uninsured). https://sdlegislature.gov/Statutes/58-11-9.1

4. South Dakota Codified Laws § 58-11-9.5 (payment for portion of judgment not collected; coverage limits). https://sdlegislature.gov/Statutes/58-11-9.5

5. South Dakota Codified Laws § 58-11-9.7 (adding UM and UIM limits prohibited; exception). https://sdlegislature.gov/Statutes/58-11-9.7

6. South Dakota Codified Laws § 58-11-9.8 (adding UM limits for multiple vehicles prohibited). https://sdlegislature.gov/Statutes/58-11-9.8

7. South Dakota Codified Laws § 58-11-9.9 (adding UIM limits for multiple vehicles prohibited). https://sdlegislature.gov/Statutes/58-11-9.9

8. South Dakota Codified Laws § 32-35-70 (owner's policy coverage and minimum amounts). https://sdlegislature.gov/Statutes/32-35-70

9. South Dakota Codified Laws § 58-11-9.3 (named-driver exclusion or reduced coverage; minimum liability). https://sdlegislature.gov/Statutes/58-11-9.3

10. South Dakota Division of Insurance, automobile insurance consumer guidance. https://dlr.sd.gov/insurance/general_guidance/auto.aspx

11. South Dakota Codified Laws § 20-9-2 (contributory negligence; comparative slight-gross rule). https://sdlegislature.gov/Statutes/20-9-2

12. South Dakota Codified Laws § 58-11-9.6 (subrogation of UIM insurer; liability insurer may pay limits). https://sdlegislature.gov/Statutes/58-11-9.6

13. South Dakota Codified Laws § 15-2-14(3) (three-year limitation for personal injury). https://sdlegislature.gov/Statutes/15-2-14

14. South Dakota Codified Laws § 15-2-13(4) (six-year limitation for injury to property). https://sdlegislature.gov/Statutes/15-2-13