A car accident can feel sudden and overwhelming. One moment, traffic is moving normally, and the next, everything changes. After the shock fades, questions begin. Who was at fault? How much is the claim worth? Many people assume the answers are simple. Under Missouri law, they are not.
Insurance companies, judges, and juries rely on evidence, documentation, and legal standards. That is why injured individuals often speak with a St. Louis car accident lawyer to better understand how these calculations work before accepting any settlement offer.
Table of Contents
How Fault Is Determined Under Missouri Law
The first step in any car accident claim is determining legal fault. Fault is based on the concept of negligence.
To prove negligence, four elements must be shown:
Every driver has a duty to follow traffic laws and operate their vehicle with reasonable care. Speeding, distracted driving, running a red light, or failing to yield may all qualify as breaches of that duty.
Evidence Used to Prove Fault
Insurance companies and courts do not rely on opinions. They rely on documentation.
Common forms of evidence include:
Sometimes, the fault is clear. Other times, it is disputed. In more serious cases, experts may be brought in to analyze skid marks, vehicle positioning, or impact angles to determine how the crash occurred.
Missouri’s Pure Comparative Fault Rule
Missouri follows a pure comparative fault system. This means more than one driver can share responsibility for a crash.
If an injured person is partially at fault, their compensation is reduced by their percentage of responsibility.
For example, if someone is awarded $100,000 but is found 20 percent at fault, their recovery would be reduced to $80,000.
Even if a person is more than 50 percent at fault, they may still recover damages. However, the amount decreases according to their share of responsibility.
Insurance companies often argue comparative fault to reduce payouts. They may claim the injured driver was speeding, distracted, or failed to avoid the collision.
Calculating Economic Damages
Once the fault is established, the next step is calculating damages. Economic damages are financial losses that can be measured through documentation.
Medical Expenses
Medical costs often form the largest part of a claim. These may include:
Future medical expenses may also be considered if ongoing treatment is required. Doctors’ reports play an important role in supporting these projections.
Lost Income
In more serious cases, injuries may reduce long-term earning capacity. If a person cannot return to the same job or must work fewer hours, future income loss may be calculated with the help of economic experts.
Non-Economic Damages
Not all losses come with receipts. Non-economic damages address the personal impact of an injury.
These may include:
Insurance companies often estimate these damages using structured methods. One common approach is applying a multiplier to medical expenses, based on the severity of the injury and the length of recovery.
The Impact of Insurance Policy Limits
Even if damages are significant, insurance policy limits can affect recovery. Drivers carry coverage up to a certain amount. If damages exceed that limit, the insurer may not pay more than the policy allows.
Underinsured motorist coverage may apply in some situations, depending on the injured person’s own policy.
Settlement Negotiations and Trial Risk
Most car accident claims are resolved through settlement. Insurance companies evaluate not only the evidence but also the risk of going to trial.
They consider:
If the case appears well-prepared and supported by strong documentation, insurers may increase their offer to avoid trial uncertainty.
Final Thoughts
Car accident claims in St. Louis are not resolved based on assumptions or emotions. Fault is determined through evidence and legal standards. Damages are calculated using documentation, expert analysis, and Missouri’s comparative fault rules.
For those navigating this process, guidance from a St. Louis car accident lawyer can help clarify how fault and damages are calculated under Missouri law and how those calculations may impact a final settlement.

