Colorado’s Comparative Fault Law and Car Accidents
How the 50% Bar Rule Works, Why the Insurance Company Wants to Blame You, and What It Means for Your Recovery.
This page will attempt to explain how Colorado’s comparative fault system in negligence cases works. One percentage point in fault can make all the difference as you will see below. That is why we recommend contacting an attorney about your case if you are unsure who was at fault or if the insurance company is trying to create any doubt. Even a little doubt can make a big difference in your case and Rampart Injury Lawyers handles cases all over Colorado from Denver to Colorado Springs, many of which involve contested liability. Contact us for a free case evaluation and discussion about your particular situation.
You were in a car accident. The other driver ran a red light. It might seem obvious who is at fault, at least to you. But then the insurance adjuster calls and says, “Our investigation shows you were speeding at the time of impact. We’re assigning you 50% fault.” Just like that, your case could go from recovery to nothing if you do not know how to fight it.
Colorado follows a modified comparative negligence system under C.R.S. § 13-21-111. If you are partially at fault for a car accident, your recovery is reduced by your percentage of fault. If you are 50% or more at fault, you are completely barred from recovering any compensation. This 50% bar rule applies to every car accident case in Colorado and is the single most important legal concept in fault-based crash litigation.
That is how Colorado’s comparative fault system works. It is just one percentage point that separates a recovery from nothing. And every insurance adjuster in the state knows exactly how to push that number in the direction that benefits their company. Understanding this law is not optional. It is the foundation of every car accident case in Colorado.
What Is Modified Comparative Negligence?
There are three basic systems states use to handle fault in accident cases. Understanding which one your state follows changes everything about your case.
Contributory Negligence
Used in only four states plus D.C., contributory negligence means that if you are even 1% at fault, you recover nothing. It is the harshest system.
Pure Comparative Negligence
Used in about 13 states, including California and New York, pure comparative negligence means you can recover damages even if you are 99% at fault. Your recovery is just reduced by your fault percentage.
Modified Comparative Negligence
Used in Colorado and the majority of states, modified comparative negligence falls in between. You can recover if you are partially at fault, but only up to a threshold. In Colorado, the threshold is 50%. Cross that line and you recover nothing.
This is all outlined in C.R.S. § 13-21-111. It says, in plain English, your damages are reduced in proportion to your fault, and if your fault is equal to or greater than the combined fault of all other parties, you get nothing.
How the 50% Bar Works: Real Numbers
The math is straightforward, but the consequences are brutal. Here is how fault percentages translate to actual dollars in a hypothetical Colorado car accident case with $200,000 in total damages.
| Your Fault % | Total Damages | Your Recovery | What Happened |
|---|---|---|---|
| 0% | $200,000 | $200,000 | Full recovery. You were not at fault. |
| 10% | $200,000 | $180,000 | You were slightly at fault. Recovery reduced by 10%. |
| 25% | $200,000 | $150,000 | Significant reduction but still six figures. |
| 30% | $200,000 | $140,000 | Adjuster argues lane change. $60,000 vanishes. |
| 49% | $200,000 | $102,000 | One point below the bar. You still recover. |
| 50% | $200,000 | $0 | At the bar. Completely barred. Recovery is zero. |
| 60% | $200,000 | $0 | Above the bar. No recovery possible. |
Look at the difference between 49% and 50%. One percentage point. $102,000 versus $0. That single point is what the entire fault fight is about. It is why insurance adjusters spend their energy trying to push your number up, not down.
Another Scenario: How Fault Gets Fought
HYPOTHETICAL SCENARIO: You are driving southbound on I-25 near Castle Rock. You are in the left lane doing 72 mph in a 65 mph zone. A truck in the right lane changes lanes into you without signaling, clipping your front quarter panel and sending you into the median barrier. You suffer a herniated disc that requires surgery. Your damages total $250,000.
The adjuster’s argument: You were speeding by 7 mph. If you had been going the speed limit, you would have been further back and the truck would have cleared the lane change. The adjuster assigns you 35% fault. Your $250,000 case becomes $162,500.
The defense push: At trial, the defense hires an accident reconstructionist who testifies that at 65 mph, you would have been 0.3 seconds further back, and the collision would not have occurred. They argue 50% fault. If the jury agrees, your recovery drops to $0.
The Rampart response: Our reconstructionist could review the truck’s EDR data and find out the evidence shows the driver never checked mirrors, never signaled, and crossed the lane line in under 1.2 seconds. At any speed between 60 and 75 mph, the collision was unavoidable. In this scenario the speeding is irrelevant to causation. Then fault could be substantially less, or even nothing at trial.
This is an example of what fighting about liability or fault looks like in practice. If necessary, both sides could hire experts. Both sides may present reconstructions. The numbers are not decided by some objective formula. They are argued, contested, and ultimately determined by a jury if the case goes to trial. The evidence you preserve, or fail to preserve, in the first days after the crash determines whether your attorney can win that fight.
How Fault Is Actually Determined in Colorado
There is no single document or authority that decides fault. It is built from layers of evidence, each carrying different weight.
The Police Report
The crash report filed under C.R.S. § 42-4-1606 is often one of the first pieces of evidence the adjuster reads. If the officer assigns a citation to the other driver, the adjuster’s leverage shrinks. If the officer assigns some of the fault in their opinion to you, the adjuster’s leverage grows. But the police report is not a judicial finding of fault. Officers are called to the scene after the collision occurred, meaning they arrive after the crash. They document what they see and what the parties tell them. Those calls are not binding on a jury.
Traffic Citations and Negligence Per Se
A traffic citation can establish negligence per se in Colorado. If the other driver was cited for running a red light under C.R.S. § 42-4-604, that citation is evidence that the driver violated a safety statute, which constitutes negligence as a matter of law. But negligence per se only proves the breach. It does not automatically determine the full allocation of fault. The other driver can still argue that your conduct contributed to the crash.
Physical Evidence and Reconstruction
Skid marks, gouge marks, debris patterns, final rest positions, and vehicle crush profiles tell the physics story. Accident reconstructionists may then use this evidence to calculate speeds, angles, and the sequence of events. EDR, or event data recorder, data from modern vehicles captures pre-impact speed, braking, throttle position, and steering input within seconds of the crash. This evidence is objective. It does not change its story depending on who asks the questions.
Witness Statements
Eyewitness accounts are often powerful but imperfect. Witnesses see a crash from their own angle, often for only a fraction of a second. Memory degrades fast. But a consistent statement from a neutral witness, taken at the scene, carries significant weight with juries.
Electronic Evidence
Cell phone records, dash cam footage, traffic camera video, GPS data, and app usage logs. Under Colorado’s Hands-Free Law, C.R.S. § 42-4-239, phone use at the time of a crash is now a negligence per se argument. If the other driver was holding their phone, that violation is admissible. If you were holding yours, the adjuster will use it against you.
The Insurance Company’s Fault Inflation Playbook
Adjusters do not determine fault at random. They follow a playbook designed to inflate your fault percentage. That is why having someone like Rampart Injury Lawyers who knows the moves in advance takes the surprise out of them.
Move 1: The Recorded Statement Trap
Often the adjuster will call within the first few days of the collision and seek a recorded statement or other information. They try to frame it as routine. It is not. Every question is designed to produce an answer that assigns you fault. For example, “Were you late?” could suggest you were driving under time pressure. “Did you have time to observe the other vehicle before you collided with it?” If you answer yes, this suggests you should have been able to take evasive action and did not. “What speed were you traveling when you collided with the other vehicle?” This response is now fixed based upon what you tell them. You do not have to provide the insurance company of the other party with a recorded statement.
Move 2: Social Media Surveillance
The adjuster and or defense investigator will review all of the public postings from your social media accounts after a collision. These could seem innocent or innocuous unless you are looking at them with a defense perspective. A picture posted two weeks after a claim was filed claiming you suffered a debilitating back injury. A check-in at a concert. A post stating “I’m feeling great today!” on one of your good pain days. Each of these postings will be taken completely out of context and used to support the argument that your injuries are not as severe as claimed and that either your distraction or your lifestyle contributed to the cause of the collision. Any postings you make can and will be used against you.
Move 3: The Pre-Existing Condition Blame Shift
If you had a prior back injury, the adjuster argues the crash did not cause your current symptoms. They are reducing the damages attributable to the crash. The eggshell plaintiff doctrine protects against this, but only if your medical records clearly document the before and after.
Move 4: Gap-in-Treatment Arguments
Gaps in treatment can occur for a number of reasons, but rest assured the insurance company does not care and will use any gaps against you. Context does not matter to them and often they will not even listen to the context or present that to the jury anyway. They just care that you had a gap. For example, let’s say you miss two weeks of physical therapy because you could not get time off work. The adjuster says the gap proves your injuries were not serious. They use this gap to argue your claimed severity is exaggerated, which feeds back into the fault equation. If your injuries are minor, the crash must have been minor, so maybe you contributed more than you admit.
Comparative Fault with Multiple Parties
Colorado’s 50% bar compares your fault against the combined fault of all other parties. This is a huge issue in multi-vehicle crashes. If you are 30% at fault, Driver B is 40% at fault, and Driver C is 30% at fault, the combined fault of the other drivers is 70%. Your 30% is less than 50% of the total, so you recover your damages reduced by 30%.
Colorado also allows designation of nonparties at fault under C.R.S. § 13-21-111.5. A defendant can point the finger at someone who is not a party to the lawsuit and ask the jury to assign them a percentage of fault. This could be anyone: a construction company that created a road hazard, a municipality that failed to maintain a traffic signal, or an employer who put a fatigued driver on the road. Rampart Injury Lawyers even sees cases where the defendants designate a nonparty at fault but can never even articulate who the nonparty is or what they did wrong. The defendant uses nonparty designation to dilute their own fault share, which reduces what they pay you.
How to Protect Your Fault Percentage After a Crash
The fault fight begins at the scene. What you do in the first few hours and days after the collision, and how you interact with the insurance company, makes a big difference.
Do Not Admit Fault at the Scene
Unless you really were at fault, do not admit it. Saying “I’m sorry” or “I didn’t see you” becomes a recorded admission in the claim file.
Do Not Give a Recorded Statement to the Other Driver’s Insurer
As stated above, you are not legally required to do so and it will not benefit you, so politely decline.
Document Everything
Once it is safe to do so, photograph the vehicles, the intersection, traffic signals, road conditions, and any visible injuries. Try to get the contact information from witnesses before they leave the scene.
Preserve Electronic Evidence
Dash cam footage, phone GPS data, and traffic camera footage can prove what actually happened. Just be aware, this evidence has limited retention periods.
Get Medical Treatment Immediately if You Need It
Gaps in treatment become ammunition for the defense to argue your injuries are not serious.
Limit Social Media Activity
Do not post about the crash, your injuries, or your activities, or if you do, be aware the insurance company will be watching. Do not destroy, alter, or modify anything already posted.
Frequently Asked Questions: Comparative Fault in Colorado
Can I Recover Compensation if I Was Partially at Fault for My Car Accident?
Yes, as long as your fault is less than 50%. Pursuant to C.R.S. § 13-21-111, your recovery is reduced by your percentage of fault. So, for example, if you are 20% at fault and your damages total $150,000, you recover $120,000. At 50% or more, you recover nothing.
Who Decides the Fault Percentages?
In a settled case, the fault percentage is negotiated between the attorneys and the insurance company. In a case that goes to trial, the jury decides. The judge instructs the jury on the law, and the jury assigns a specific percentage to each party based on the evidence.
Does a Traffic Citation Automatically Mean I Was at Fault?
A citation is evidence of a traffic law violation and can establish negligence per se. But a citation does not determine the full fault allocation. You can be cited and still be less than 50% at fault if the other driver’s conduct was a more significant cause of the crash.
What If the Other Driver Was Not Cited but Was Clearly at Fault?
The absence of a citation does not mean the other driver was not negligent. Officers sometimes cannot determine fault at the scene. Independent evidence like dash cam footage, witness statements, and accident reconstruction can establish fault regardless of whether a citation was issued.
Can the Insurance Company Assign Me a Fault Percentage Without Going to Court?
Insurance companies make their own internal fault determinations for settlement purposes. However, those determinations are not legally binding. They are simply a negotiation position. You do not have to accept the position if you feel the determination was incorrect. You may continue to negotiate with the insurance company, or you can proceed with filing a lawsuit and let a jury determine your damages.
What Does Nonparty Designation Mean, and How Does It Affect My Case?
Under C.R.S. § 13-21-111.5, a defendant may designate a nonparty, someone not named in your lawsuit, as partially liable for a portion of the plaintiff’s total liability. The jury may then assign a percent of liability to the nonparty, thus reducing the defendant’s share of the total liability. This is a very common defense strategy to shift some of the liability off of the defendant.
Is Comparative Fault Different from Contributory Negligence?
Yes, comparative fault and contributory negligence are different things. Under contributory negligence, used in only four states plus D.C., any fault on your part bars recovery entirely. Under Colorado’s comparative fault system, you can recover as long as you are less than 50% at fault. Colorado’s system is significantly more favorable to injured people.
Does Comparative Fault Affect My UM/UIM Claim?
In most UM/UIM cases filed against your own insurer, the comparative fault analysis focuses on the fault of the uninsured or underinsured driver. Your own fault may still be relevant if the insurer argues you contributed to the crash. The 50% bar under C.R.S. § 13-21-111 applies to the underlying tort claim that triggers the UM/UIM coverage.
Can Comparative Fault Apply to Pedestrian and Bicycle Cases?
Yes. Pedestrians and cyclists are not exempt from the 50% bar. If a pedestrian jaywalks and is hit by a speeding driver, the jury allocates fault between both parties. If the pedestrian is found 50% or more at fault, they recover nothing.
How Does Rampart Fight the Insurance Company’s Fault Arguments?
We hit back at the fault arguments on all fronts. For the cases that need it, we preserve the EDR data and dash camera footage, which would otherwise disappear, to use in our case against the defendant. We might also hire accident reconstruction experts that can challenge the defense’s expert witnesses on the speeds of vehicles and causation of accidents. We sometimes request the timing of the traffic signals from the city or municipality. We can request cell phone records to show if there was a distraction involved. We prepare for trial so that the insurance companies know we are prepared to take their inflated fault number to a jury for them to decide, rather than accept the insurance companies’ numbers as true.
Worried About Being Blamed for Your Accident?
The insurance company has already started building its fault argument against you. It started the day of the crash. Every day that passes without an attorney protecting your side of the story is a day the adjuster’s version goes unchallenged.
Our attorneys at Rampart Injury Lawyers have spent their careers fighting against liability and fault claims made by insurance companies. We know what to look out for in cases because of our experience. That is why we aggressively prepare each case using evidence and expert analysis when appropriate, making sure the insurance company knows we are ready to go to court if necessary. The initial consultation is complimentary. There are no attorney’s fees unless we successfully secure compensation for you.
