How South Dakota's 'Slight vs. Gross Negligence' Rule Affects Your Personal Injury Claim

Current as of: October 3, 2026 Personal Injury South Dakota
In South Dakota, you can only recover compensation for an injury if your share of the fault was considered 'slight' while the defendant's fault was 'gross' by comparison. If a jury determines your negligence was more than slight, you could be barred from receiving any money at all.

When you are injured in an accident, determining who is at fault is rarely completely black and white. Most states use a standard 'comparative negligence' system, where your compensation is simply reduced by your percentage of fault. However, South Dakota follows a highly unique legal doctrine known as the 'slight vs. gross' negligence rule, codified under S.D. Codified Laws § 20-9-2. This law makes personal injury claims in the Mount Rushmore State incredibly distinct and, in many ways, more challenging for victims.

Under this rule, if you contributed to your own injury, you can only win a lawsuit if your negligence was 'slight' in comparison to the defendant's negligence. The law does not give a strict mathematical percentage (like 10% or 20%) for what 'slight' means; it is entirely up to a jury to decide based on the facts. Because this system is so subjective, it is highly recommended to seek professional legal counsel. You can find an experienced personal injury lawyer in your area by browsing our US Lawyers Catalog.

Understanding the Slight vs. Gross Standard

In South Dakota courts, juries are asked to compare the actions of both parties directly. A landmark case that illustrates how courts weigh this is Wood v. City of Crooks, 559 N.W.2d 558 (SD Supreme Court 1997), which reinforces that the plaintiff's fault must be evaluated in direct comparison to the defendant's behavior.

Examples of Slight Negligence

What constitutes 'slight' negligence? Imagine you are driving through an intersection in Rapid City. You are driving 2 miles per hour over the speed limit. Suddenly, a commercial truck driver who is texting and running a red light T-bones your car. While you technically broke a traffic law (speeding slightly), a jury would likely deem your negligence as 'slight' compared to the truck driver's reckless actions. In this scenario, you would still be allowed to recover damages, though your payout might be slightly reduced.

What Constitutes Gross Negligence

For your negligence to be considered 'slight,' the other party's fault must often be overwhelming. Gross negligence involves a conscious and voluntary disregard for the need to use reasonable care. This could involve a drunk driver, a property owner who intentionally ignored a collapsed staircase for months, or a doctor performing surgery under the influence of drugs. Proving the other party was grossly negligent makes it much easier to argue that your own missteps were merely slight.

How Adjusters Use This Rule to Deny Claims

Insurance adjusters love South Dakota's comparative fault rule because it gives them a powerful weapon to deny your claim entirely. An adjuster will scrutinize every detail of your accident to assign you as much blame as possible. If they can convince you-or a judge-that your fault was 'more than slight' (perhaps you were not wearing a seatbelt, or you were looking at your radio for one second), they will offer you a $0 settlement. They use the ambiguity of the word 'slight' to bully victims into dropping their claims or accepting lowball offers.

Strategies for Proving the Defendant's Overwhelming Fault

To defeat the insurance company's tactics, you must aggressively document the defendant's overwhelming fault. This involves gathering irrefutable evidence. Your attorney may hire accident reconstruction experts, subpoena the defendant's cell phone records to prove distracted driving, or pull security camera footage from a nearby business. The goal is to make the defendant's actions look so egregious that any minor mistake you made completely pales in comparison.

Step-by-Step Process for Filing Your Claim

Whether you live in Sioux Falls, Aberdeen, or Brookings, the process for filing a personal injury lawsuit generally follows these steps.

Step 1: Seek Immediate Medical Attention

Your health is paramount. Furthermore, medical records serve as the foundation of your legal claim. Delaying treatment gives the insurance adjuster an excuse to argue that your injuries were caused by something else, thereby increasing your percentage of 'fault' for your own suffering.

Step 2: Investigation and Evidence Gathering

Your lawyer will collect police reports, witness statements, and expert testimonies to build a timeline that highlights the defendant's gross negligence and minimizes your own liability.

Step 3: Filing the Civil Lawsuit

If the insurance company refuses to offer a fair settlement, your attorney will file a formal complaint. This is usually filed at a local court, such as the Minnehaha County Circuit Court, Sioux Falls or the Pennington County Circuit Court, Rapid City. The filing will typically be accompanied by Form UJS-232, South Dakota, Unified Judicial System, Civil Case Filing Statement.

How Much Does it Cost in South Dakota?

Pursuing a personal injury claim in South Dakota is accessible because attorneys generally work on a contingency fee basis.

Attorney Representation$0 upfront (typically 33% to 40% of the final settlement)
Circuit Court Filing Fee$72 (often advanced by your lawyer)
Accident Reconstruction Experts$2,000 - $5,000+ (advanced by your lawyer)
Medical Record Retrieval$50 - $200

How Long Does the Process Take?

The timeline for a personal injury claim depends heavily on whether the insurance company wants to fight over the 'slight vs. gross' negligence standard. If liability is painfully obvious (e.g., a drunk driver hit you while you were legally parked), a settlement might be reached in 6 to 9 months. However, if the insurer argues your fault was more than slight, the case will likely proceed to a jury trial, which can take 1.5 to 3 years in South Dakota courts.

Frequently Asked Questions (FAQ)

What happens if the jury decides we are equally at fault?

Under South Dakota law, if you and the defendant are found to be 50/50 at fault, your negligence is not considered 'slight' in comparison. Therefore, you would be completely barred from recovering any damages.

Can a passenger be found at fault in a car accident?

Generally, a passenger has zero fault. However, if you knowingly got into a car with a heavily intoxicated driver, an insurance company might argue you assumed the risk, thereby assigning you some degree of negligence.

Does the slight/gross rule apply to wrongful death claims?

Yes. The slight vs. gross comparative negligence standard applies to almost all personal injury claims in South Dakota, including wrongful death lawsuits filed by surviving family members.

Who decides what 'slight' means?

Because there is no mathematical formula in the statute, the definition of 'slight' is ultimately decided by the judge or the jury after hearing all the evidence presented at trial.


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