South Dakota uses a unique 'slight/gross' rule: plaintiff recovers only if their fault is 'slight' and defendant's is 'gross' by comparison. Authority: S.D. Codified Laws § 20-9-2.
The South Dakota pattern jury instructions ask jurors to determine: (1) was the defendant negligent? (2) was the plaintiff negligent? (3) was each party\'s negligence a substantial factor in causing the injury? (4) what percentage of fault, totaling 100%, do you assign to each party?
The court applies the slight-versus-gross comparative fault formula to those percentages after the verdict form is returned.
South Dakota's comparative-fault doctrine determines how much of a personal-injury verdict an injured plaintiff actually keeps. Two plaintiffs with identical $1,000,000 verdicts can walk away with wildly different recoveries depending on the fault percentages the jury assigns.
Under South Dakota's pure comparative rule, fault is converted directly into a damages reduction. A jury that finds a plaintiff 30% at fault on a $500,000 case leaves the plaintiff with $350,000 , no further analysis required.
Pre-trial settlement valuation and trial strategy in South Dakota both turn on these numbers. Below: five scenarios at common verdict sizes and fault percentages, with the recovery a South Dakota plaintiff would actually receive under the state\'s slight-versus-gross comparative fault rule.
| Verdict | Plaintiff fault | Net recovery | Reduction |
|---|---|---|---|
| $100,000 | 10% | $90,000 | $10,000 |
| $250,000 | 25% | $187,500 | $62,500 |
| $500,000 | 49% | $255,000 | $245,000 |
| $500,000 | 50% | $250,000 | $250,000 |
| $1,000,000 | 60% | $400,000 | $600,000 |
Scenario: a slip-and-fall plaintiff is awarded $1,000,000 by a South Dakota jury, with 10% of fault attributed to them for not watching where they walked. Under South Dakota law (slight-versus-gross comparative fault), the final award is $90,000.
Worked example: a South Dakota jury awards a plaintiff $500,000 in damages and finds the plaintiff 25% at fault. Under the state's slight-versus-gross comparative fault rule, the plaintiff actually recovers $187,500.
Worked example: a South Dakota jury awards a plaintiff $500,000 in damages and finds the plaintiff 49% at fault. Under the state's slight-versus-gross comparative fault rule, the plaintiff actually recovers $255,000.
Scenario: a slip-and-fall plaintiff is awarded $1,000,000 by a South Dakota jury, with 50% of fault attributed to them for not watching where they walked. Under South Dakota law (slight-versus-gross comparative fault), the final award is $250,000.
Practical illustration: an injured driver wins a $200,000 verdict in South Dakota and the jury assigns 60% fault to them. Applying South Dakota's slight-versus-gross comparative fault rule yields a net recovery of $400,000.
Plaintiffs' attorneys in South Dakota screen cases with the comparative-fault rule front of mind. A case where the defense can credibly argue the plaintiff was 40%+ at fault gets a different intake decision in a 50%-bar state than in a pure-comparative state.
Voir dire and jury instructions in South Dakota comparative-fault cases shape outcomes as much as the underlying facts. Plaintiffs' counsel often spends opening arguments framing the plaintiff's actions as reasonable, knowing that even a moderate fault allocation can significantly reduce the verdict.
South Dakota comparative-negligence rules only matter if you file on time. The state\'s personal-injury statute of limitations is 3 years from the date of injury (S.D. Codified Laws § 15-2-14). Even an airtight liability case is dismissed with prejudice if the complaint is filed late.
South Dakota applies slight-versus-gross comparative fault. South Dakota uses a unique 'slight/gross' rule: plaintiff recovers only if their fault is 'slight' and defendant's is 'gross' by comparison.
South Dakota bars recovery when the plaintiff is non_slight% or more at fault.
South Dakota jurors are presented with a special verdict form asking them to assign fault percentages totaling 100% to each party (and any non-party at fault under joint-tortfeasor rules). The trial court then applies the comparative-fault formula to compute the final recovery.
Yes. South Dakota juries can apportion fault among multiple defendants (and sometimes non-party tortfeasors). The treatment of joint and several liability , whether each defendant is liable only for their share or for the entire judgment if others are insolvent , varies by state statute.
South Dakota courts vary on the "seat-belt defense." Some states allow evidence of non-use as a fault factor; others (by statute or judicial rule) exclude it. Plaintiffs\' counsel should consult current South Dakota appellate decisions before deciding how to handle the issue at trial.
Generally yes , South Dakota\'s comparative-fault rule applies across negligence claims, including medical malpractice. Some states adjust the framework for medmal cases (e.g., reducing the plaintiff-fault relevance because patients rarely contribute to their own injuries in the traditional sense), but the basic rule applies unless the statute carves out an exception.
In slight-versus-gross comparative fault South Dakota, the bar threshold becomes the focal point of settlement: defendants negotiate harder near the threshold, plaintiffs accept reduced offers to avoid the bar.
Last verified against primary sources on 2026-05-16.