Comparative negligence rules in South Dakota

If the other driver's insurer is already hinting that you were partly to blame for your crash, pay close attention. South Dakota decides shared-fault cases with a rule found nowhere else in the country, and it can be far less forgiving than the "50 percent bar" most people have heard about.

The "slight" rule

South Dakota is the only state that still uses a "slight" comparison to decide whether a partly-at-fault driver can recover at all.¹² The rule lives in SDCL 20-9-2. Your own carelessness does not automatically end your claim, but only "when the contributory negligence of the plaintiff was slight in comparison with the negligence of the defendant." If you clear that hurdle, "the damages shall be reduced in proportion to the amount of plaintiff's contributory negligence."¹

Read that twice, because it works differently than the systems used in the other 49 states. Most states run pure comparative fault (you recover no matter how at fault you were, minus your own share) or a modified rule that cuts you off once you hit 50 or 51 percent. South Dakota kept the comparison it first adopted back in 1941. The test asks whether your fault was "slight" next to the other driver's, a qualitative judgment rather than a spot on a percentage scale.¹²

There is no magic number

Because the test is qualitative, the statute never defines "slight," and South Dakota courts have declined to fix a percentage for it.¹ That absence cuts against injured drivers. There is no comfortable 49-percent-and-under safe zone here. In Wood v. City of Crooks, the South Dakota Supreme Court held that a jury's finding of 30 percent fault on the plaintiff was more than slight as a matter of law, which erased the recovery entirely.³

So in South Dakota you can be shut out at a fault share that would still let you collect most of your money almost anywhere else. A driver found 30 percent at fault would still recover the remaining 70 percent of their damages in every state that borders South Dakota. On the Wood facts, that same driver recovers nothing.³ Exactly where the cutoff sits somewhere below 30 percent is unsettled, and that uncertainty is what makes the fight over fault percentages matter so much in this state.

How a jury applies it

The jury works in two steps. First it makes the qualitative call: was your negligence slight compared with the defendant's? That gate decides whether you recover anything. Only if you pass does the second step happen, cutting your award "in proportion to" your share of the blame.¹

When more than one defendant is involved, South Dakota compares your negligence against the combined negligence of all of them, not against each defendant one at a time.³ The court in Wood reasoned it would be unfair to deny recovery to a plaintiff who was 10 percent at fault against nine defendants each also 10 percent at fault, just because the plaintiff's share equaled any single defendant's.³ In a multi-car pileup that rule can work in your favor, since your slice may look small next to everyone else's added together.

What the insurer will call "your fault"

Adjusters know the slight rule, and in a disputed claim they have every reason to build your share of fault up past "slight." The usual arguments involve speed, following distance, failure to yield, and distraction. South Dakota's handheld ban, SDCL 32-26-47.1, prohibits using a mobile electronic device to text, take photos, watch video, or browse the internet while driving, and a violation can be put in front of the jury as evidence that you were negligent too.⁴

The practical response is to preserve everything that shows what the other driver did. The official crash report is the starting point, filed through the state's Office of Accident Records; you can read how South Dakota's crash-report process works.⁵

No cap shrinks what's left

Once a jury reduces your damages for your share of fault, South Dakota does not then apply a statutory cap to an ordinary car-accident award. The state's old general damages cap was struck down as unconstitutional in Knowles v. United States, where the court said a fixed limit reduced the jury's verdict to "less than an advisory status" under the state due process clause.⁶ Punitive damages stay on the table against a driver for willful or wanton conduct, but only after a pretrial showing under SDCL 21-1-4.1 that clears the way for the jury to consider them.⁷

The deadlines that box in your claim

A strong fault argument is worthless if you file too late. Most South Dakota injury lawsuits must be filed within three years of the crash under SDCL 15-2-14(3).⁸ Vehicle property damage runs on a longer clock, six years, under the state's catch-all for injuries to goods and chattels, SDCL 15-2-13(4).⁹ If the injured person was a minor, the three-year injury period does not even begin until they turn 18 (SDCL 15-2-22).¹⁰

That six-year property window matters if your car was worth less after the crash even after a proper repair. A diminished-value claim rides the longer property clock, not the shorter injury one.⁹

Why the fight over percentages is worth it

Given how the slight rule works, a few points of assigned fault can be the difference between full compensation and none. Evidence is the real battleground: the crash report, independent witnesses, scene photos, and any speed or phone data that pins the blame where it belongs.

This is also why South Dakota builds uninsured and underinsured motorist coverage into every auto liability policy, at limits matching your own bodily-injury coverage, so a broke or uninsured at-fault driver does not leave you with nothing to collect (SDCL 58-11-9).¹¹ Whether your share of fault is genuinely "slight" is a judgment best measured against the case law by someone who tries these cases. You can find a South Dakota attorney through the directory.

This is general information about South Dakota law, not legal advice about your specific situation.

Sources

1. South Dakota Legislature, SDCL 20-9-2 (Comparative negligence, reduction of damages). https://sdlegislature.gov/Statutes/20-9-2

2. University of South Dakota Law Review, "The Status of Comparative Negligence in South Dakota," USD institutional repository. https://red.library.usd.edu/cgi/viewcontent.cgi?article=3708&context=sdlrev

3. Wood v. City of Crooks, 1997 SD 20, 559 N.W.2d 558 (S.D. 1997), CourtListener. https://www.courtlistener.com/opinion/900218/wood-v-city-of-crooks/

4. South Dakota Legislature, SDCL 32-26-47.1 (mobile electronic device use while driving). https://sdlegislature.gov/Statutes/32-26-47.1

5. South Dakota Department of Public Safety, Office of Accident Records. https://dps.sd.gov/records/accident-records/report-accident

6. Knowles v. United States, 1996 SD 10, 544 N.W.2d 183 (S.D. 1996), CourtListener. https://www.courtlistener.com/opinion/7930885/knowles-v-united-states/

7. South Dakota Legislature, SDCL 21-1-4.1 (punitive damages, pretrial showing). https://sdlegislature.gov/Statutes/21-1-4.1

8. South Dakota Legislature, SDCL 15-2-14 (three-year limitation for personal injury). https://sdlegislature.gov/Statutes/15-2-14

9. South Dakota Legislature, SDCL 15-2-13 (six-year limitation, injury to goods or chattels). https://sdlegislature.gov/Statutes/15-2-13

10. South Dakota Legislature, SDCL 15-2-22 (tolling for minors and disability). https://sdlegislature.gov/Statutes/15-2-22

11. South Dakota Legislature, SDCL 58-11-9 (uninsured motorist coverage required). https://sdlegislature.gov/Statutes/58-11-9