When you file a liability claim after an accident, the claims adjuster’s job is to figure out who is legally responsible for the damage – and by how much. In many cases this is not a simple yes-or-no question. The adjuster may decide that both parties share some degree of fault. This is called a partial liability determination. If you are not ready for what that means, it can cost you money, time, and leverage in negotiations.
The first thing to understand is that partial liability is not a judgment about right and wrong. It is a business calculation the insurance company uses to decide how much of your financial loss they are willing to pay. For example, you are rear-ended at a stoplight. The other driver clearly caused the accident. But the adjuster discovers you had a broken taillight. They may argue that your broken taillight contributed to the accident – even slightly – and therefore you are 10 or 20 percent at fault. In many states, that percentage directly reduces your payout.
How much your payout gets reduced depends on the legal rules where you live. There are two main systems. In pure comparative fault states, you can still recover money even if you are 99 percent at fault, but your compensation is reduced by your percentage of fault. In modified comparative fault states, you cannot recover anything if you are found to be 50 percent or more at fault. A few states still use contributory negligence, where any fault at all – even one percent – bars you from recovering anything. Knowing which rule applies in your state is critical. The adjuster will not volunteer this information.
When you receive a letter or phone call telling you that the insurance company has assigned a percentage of fault to you, do not accept it at face value. The adjuster is not a judge. That percentage is their opinion, often based on incomplete information. Your job is to challenge that opinion with facts. Ask for the specific evidence that supports their determination. Common reasons adjusters assign partial fault include failure to yield, speeding, distracted driving, lack of maintenance on your vehicle, or even weather conditions. You need to see their notes, photos, police reports, and any witness statements they are using.
One of the most powerful tools you have is the police report. If the officer at the scene did not cite you for any violation, you can use that as strong evidence that you were not at fault. Similarly, if you have dashcam footage or photographs taken at the scene, gather them immediately. The longer you wait, the harder it is to locate and preserve evidence. Adjusters rely heavily on their own investigation, which may be biased toward protecting their company’s bottom line. Do not assume they are being objective.
You should also understand how partial liability affects your own insurance, not just the other party’s. If you have collision coverage, you can file a claim with your own insurer regardless of fault. But if you are found partially at fault, your own insurer may raise your premiums at renewal. Some policies have accident forgiveness, but that forgiveness often disappears once you are assigned any percentage of fault. Even a 5 percent determination can count against you.
Another practical concern is timing. When an adjuster believes you share some fault, they often slow down the claims process. They may ask for additional statements, request medical records, or delay inspections. This is not an accident. They want to see if you get frustrated or desperate enough to accept a lower settlement. Do not fall for it. Document every call, every email, and every deadline. Send a written request for a status update every two weeks. The adjuster has a legal duty to handle your claim in good faith, and a written trail makes it harder for them to drag their feet.
If the partial liability determination seems unfair, you have options. You can request a re-evaluation by a supervisor. You can also hire a public adjuster or an attorney who specializes in liability claims. Many people think they only need a lawyer when fault is clear against them, but a lawyer can be most valuable when the other side is trying to shift blame onto you. A lawyer will review the adjuster’s evidence, gather counter-evidence, and negotiate from a position of strength.
Remember that a partial liability determination is not final until you accept it or a court decides otherwise. The adjuster will present it as a done deal, but you have the right to push back. Stay calm, gather proof, and never sign anything that admits fault without consulting someone who understands how these determinations affect your legal rights. Ultimately, the more you know about how partial liability works, the better you can protect your payout and your future insurance costs.
