Does Not Wearing a Seat Belt Hurt Your Injury Claim in Missouri?

Short answer: usually not by much. Under Missouri law (RSMo 307.178.4), not wearing a seat belt can’t be used as evidence that you were comparatively negligent in a car crash case. The defense can only bring it up to reduce damages if they first put on expert evidence that the missing belt actually contributed to your injuries, and even then the reduction can’t exceed 1% of the damages awarded.

I’m Tyson Mutrux, and I hear this worry all the time. The insurance adjuster says “you weren’t buckled,” and people assume their case is over. It isn’t.

By Tyson Mutrux, Mutrux Firm Injury Lawyers

Why I’m writing about this today

Today, October 28, 2026, is MoDOT’s 10th annual Buckle Up Phone Down Day. According to MoDOT, 716 people have died on Missouri roadways so far in 2026, and more than half of those killed in vehicles were unbuckled.

So yes, buckle up. Every time. But if you already got hurt in a crash and you weren’t wearing your belt, you need to know what the law actually says, not what the adjuster wants you to believe.

What Missouri’s seat belt law says

Missouri’s seat belt statute is RSMo 307.178. It requires the driver and front seat passenger of a passenger car to wear a properly adjusted and fastened safety belt. It also covers anyone under 18 driving or riding in a truck. Kids under 16 fall under a separate child restraint section, RSMo 307.179.

A “passenger car” under the statute is a motor vehicle designed to carry ten people or less. Motorcycles, motorized bicycles, motor tricycles, and trucks licensed at 12,000 pounds or more are left out.

The penalty for not buckling up is small: a fine of no more than ten dollars, no court costs, and no points on your license.

Here’s the part that matters for your injury claim. Subsection 4 says that in a case for damages from operating a motor vehicle, failure to wear a safety belt “shall not be considered evidence of comparative negligence.”

How insurers use the seat belt argument

Adjusters love this one. They’ll say your injuries would have been minor if you’d been buckled, so your claim is worth a fraction of what you’re asking. Sometimes they say it before they’ve even looked at your medical records.

It’s a negotiation tactic. In Missouri, the law puts real limits on how far that argument can go in court, and the adjuster knows it.

What the defense has to prove

The statute lets the seat belt issue in only to mitigate damages, and only under specific conditions:

• The party raising it must first introduce expert evidence proving that the failure to wear a belt contributed to the injuries you’re claiming.
• If the evidence supports that finding, the jury may reduce your recovery.
• That reduction can’t exceed one percent of the damages awarded, figured after any reductions for comparative negligence.

Read that again. One percent. Not half. Not a third. And they don’t get there by just pointing out you weren’t buckled. They need an expert.

What this means for your claim

The big question in your case is still who caused the crash and what your injuries are worth. Missouri is an at-fault state that follows pure comparative fault, so if the other driver ran the light or rear-ended you, that’s where the fight is.

One big exception. Subsection 5 says the 1% cap doesn’t apply to cases about the design, manufacture, or sale of a vehicle factory-equipped with a seat belt. In those product cases, not wearing a belt can be used as evidence of comparative fault, causation, and more. If your case involves a vehicle defect, that changes the math.

Also, don’t wait. Missouri generally gives you five years to file a personal injury suit, and wrongful death claims have a shorter deadline. Evidence goes stale a lot faster than that.

If you were hurt in a crash around St. Louis or mid-Missouri, you can learn more on our St. Louis car accident lawyer page, our Columbia car accident lawyer page, or our overview of the car crash claim process.

A quick note on Illinois

Illinois is different, and in your favor. Under 625 ILCS 5/12-603.1(c), failure to wear a seat belt “shall not be considered evidence of negligence, shall not limit the liability of an insurer, and shall not diminish any recovery for damages arising out of the ownership, maintenance, or operation of a motor vehicle.” So in an Illinois car crash case, the seat belt argument is off the table under that statute.

Frequently asked questions

Can I still file a claim in Missouri if I wasn’t wearing a seat belt?

Yes. Not wearing a seat belt doesn’t bar your claim. Under RSMo 307.178.4 it can’t be treated as evidence of comparative negligence.

How much can not wearing a seat belt reduce my settlement in Missouri?

At trial, the reduction can’t exceed one percent of the damages awarded, and only if the defense first proves with expert evidence that the missing belt contributed to your injuries.

Does the defense need an expert to raise the seat belt issue?

Yes. The statute requires the party raising it to first introduce expert evidence proving that the failure to wear a belt contributed to the injuries claimed.

Does the 1% limit apply in every case?

No. It doesn’t apply to cases about the design, manufacture, distribution, or sale of a vehicle factory-equipped with a seat belt. In those product cases, seat belt evidence can come in more broadly.

Who has to wear a seat belt in Missouri?

The driver and front seat passenger of a passenger car, and anyone under 18 driving or riding in a truck. Children under 16 must be secured under the child restraint rules in RSMo 307.179. There are exceptions, including for medical reasons and agricultural work.

What is the penalty for not wearing a seat belt in Missouri?

A fine of no more than ten dollars. No court costs are imposed, and no points are assessed against your license.

Can police pull me over just for not wearing a seat belt in Missouri?

For adults, the statute says no person shall be stopped, inspected, or detained solely to determine compliance with the seat belt requirement.

Is it different if my crash happened in Illinois?

Yes. Illinois law says failure to wear a seat belt shall not be considered evidence of negligence and shall not diminish any recovery for damages from a motor vehicle crash.

Is Missouri a no-fault state?

No. Missouri is an at-fault state. The driver who caused the crash, and their insurer, can be held responsible, and Missouri follows pure comparative fault.

How long do I have to file a car accident claim in Missouri?

Generally five years for personal injury. Wrongful death claims generally have a three-year deadline. Talk to a lawyer early, because exceptions can apply.

If you were hurt in a crash in Missouri or Illinois, belted or not, fill out the form on this page and we’ll take a look at whether you have a case.

This post is general information, not legal advice.