How to File a Claim Against an At-Fault Driver And Get the Compensation You’re Actually Owed

How do you file a claim against an at-fault driver?

To file a claim against an at-fault driver, collect their insurance information at the scene, document the accident with photos and a police report, notify both your insurer and theirs, submit a formal third-party claim, and send a demand letter once your medical treatment is complete. If the insurer disputes or undervalues your claim, a personal injury attorney can negotiate or file suit on your behalf.

Getting hit by another driver is disorienting enough on its own. Then you realize you have to deal with an insurance company you’ve never heard of, prove what happened, and fight for money that should never have been in dispute in the first place.

The good news: there is a clear process, and following it correctly from the beginning makes every step that follows easier. This guide walks you through how to file a claim against an at-fault driver — from what to do in the first minutes at the scene all the way through the demand letter and settlement. If the other driver caused your accident, this is what you do next.

What You Need to Collect at the Scene Before You Leave

The foundation of your entire personal injury claim is built in the minutes immediately after the crash. Evidence disappears fast — skid marks fade, witnesses leave, memories blur. What you collect here determines how strong your case is weeks later when the insurer starts asking questions.

Start by obtaining the at-fault party’s full name, contact information, driver’s license number, and complete insurance details including the company name, policy number, and policy effective dates. Take a photo of their insurance card and driver’s license if possible. This information is critical because you cannot file a third-party claim without knowing who insures the responsible party.

Then document the scene itself. Photograph everything from multiple angles. For vehicle accidents, capture all vehicle damage, the accident scene including road conditions and traffic signs, skid marks, debris, and the final resting positions of vehicles. Take wide shots showing the overall scene and close-ups of specific damage. Modern smartphones timestamp photos, which helps establish the timeline.

If witnesses are present, get their names and phone numbers before they walk away. A witness statement from someone with no stake in the outcome carries significant weight with insurance adjusters and in court.

Call 911 and request a police response even if the accident seems minor. The responding officer will document the scene, interview both drivers, and write an official accident report — one of the most important documents in your entire claim. In some situations, the other driver’s insurance company will accept that its insured was liable, especially if it was a rear-end crash or if a police report, numerous witnesses, and other evidence points to their insured as the at-fault driver.

Seek medical attention immediately — even if you feel fine. Adrenaline after a crash masks pain, and injuries like whiplash and soft tissue damage often don’t show symptoms for 24 to 72 hours. Seeing a doctor the same day creates a medical record that directly connects your injuries to the accident. Waiting gives the insurer a reason to argue your injuries came from something else.

Whether to File With Your Own Insurer or the At-Fault Driver’s Insurer First

This is the question most accident victims don’t think to ask — and the answer affects how quickly you get paid, how much leverage you have, and who you’re dealing with throughout the process.

File a claim with the other driver’s liability policy when an accident is the other driver’s fault. If fault is unclear, file a claim with both insurers. Once fault is determined, you’ll get coverage under one or both policies.

Filing directly against the at-fault driver’s insurer — called a third-party claim — means you’re pursuing compensation from the policy that exists specifically to cover this situation. Their liability insurance is legally required to pay for your damages when their policyholder is at fault. That’s what it’s there for.

Another factor to consider is that rental reimbursements are only available under your own insurance policy. If you have rental reimbursement on your policy, the only way to use it is if you file on your own insurance policy. So if getting a rental car quickly matters, filing with your own insurer under collision coverage may be faster — your own insurer will then pursue reimbursement from the at-fault driver’s company through a process called subrogation.

Filing a claim even when you’re not at fault can also serve as a good precautionary measure, in case the other driver is uninsured or if their insurance is invalid. Always notify your own insurer that the accident happened, even if you’re filing the primary claim against the other driver’s policy. Your policy may require it, and failing to report can limit your own coverage options later.

If you’re unsure which path is right for your situation, a car accident lawyer can review your coverage and the facts of the accident in a free consultation — before you make a decision that’s hard to reverse.

Related article: Can I Claim for an Accident That Was My Fault? What Your Own Insurance Actually Covers

How to Formally Open a Third-Party Claim With the At-Fault Driver’s Insurance Company

Once you have the at-fault driver’s insurance information, the next step is contacting their insurer to formally open your claim. This is a straightforward step — but how you handle it matters.

The claim can be initiated online, over the phone with the at-fault driver’s insurance company, or your insurance company can file it on your behalf. Call the claims department directly using the number on the at-fault driver’s insurance card. Tell them you are filing a third-party claim against their policyholder. Provide the policy number, the date and location of the accident, and basic factual details about what happened.

The representative will verify the policy was active on the date of loss and create a claim file, assigning you a claim number. Write this number down, as you’ll need it for all future communications. Keep your initial statement brief and factual. Describe what happened in simple terms without admitting any fault or speculating about details you’re unsure of.

Do not give a recorded statement during this first call. The insurer will almost certainly ask. You are not required to provide one, and doing so before you’ve seen a doctor, reviewed the police report, or spoken to an attorney is one of the fastest ways to damage your claim. Tell them your attorney will be in contact, or simply say you’ll follow up once your investigation is complete.

Let your insurance company know as well. If police responded to the accident, get a copy of the report and send it to the other insurance company.

What Evidence You Need to Build a Strong Claim Against the At-Fault Driver

Opening the claim is just the beginning. What you submit to support it determines what you get paid. Insurance adjusters do not take your word for anything — they look for documentation that proves both fault and the extent of your losses.

The core evidence package for a third-party car accident claim includes:

Your police report is the most powerful single document. It’s an official, third-party account of what happened and often includes the officer’s determination of fault and any citations issued. Request a copy from your local police department or sheriff’s office — most allow you to request it online within a few days of the accident.

Your medical records and bills prove that your injuries exist, that they were caused by the accident, and what they have cost you. Your medical records create a clear timeline of your pain, your treatment, and the professional opinions of the doctors who have cared for you. You’ll need a complete set — initial treatment records, ambulance or paramedic reports, emergency room charts, follow-up visits, and physical therapy records.

Your photographs of the scene, vehicle damage, and injuries taken at or immediately after the crash. The more angles and detail, the better.

Witness statements from anyone who saw the accident. Written or recorded statements made close to the time of the crash are more persuasive than recollections gathered weeks later.

A personal injury journal — a daily log of your pain levels, physical limitations, and how the injuries have affected your work and daily life. Courts and adjusters treat consistent, contemporaneous records seriously. Start it the day of the accident.

Lost wage documentation from your employer confirming days missed and your rate of pay.

Do not sign any medical release form giving the other driver’s insurer access to your full medical history. Stick to the facts and avoid speculation when describing what happened. Remember that the conversation will be recorded and will be used when determining who was at fault. Only provide records directly related to the injuries caused by this accident.

How Fault Is Determined and How Your State’s Rules Affect Your Payout

Before any money changes hands, the at-fault driver’s insurer will conduct its own investigation into what caused the crash. Understanding how fault is assigned in your state is essential — because it directly affects how much you can recover.

When you file a claim after a car accident, you must prove that the other driver’s negligence caused your injury. Usually, this amounts to showing the other driver ignored traffic rules or was acting carelessly. The initial stages of the claims process involve an investigation to determine who was at fault.

Most states use some form of comparative fault, which means even if you were partially responsible for the accident, you can still recover compensation — reduced by your percentage of fault. Pure comparative negligence is followed by 12 states and allows plaintiffs to seek compensation regardless of their level of fault. Modified comparative negligence — the most common system — means a plaintiff cannot recover damages if they are found to be 50% or 51% or more at fault, depending on the state’s specific rule.

There are four states where the rules are far harsher. Only four states and the District of Columbia follow contributory negligence: Alabama, D.C., Maryland, North Carolina, and Virginia. In states that follow the rule of contributory negligence, plaintiffs are completely barred from recovering damages if they are found to be even slightly at fault — typically even 1% at fault.

This is why it matters what you say to the at-fault driver’s insurer during their investigation. If the insurance company assigns you partial fault and you disagree, request their specific reasoning and evidence. Provide counter-evidence addressing each point they raise. Sometimes adjusters make assumptions that can be disproven with additional documentation.

A personal injury attorney can challenge a fault determination with additional evidence — traffic camera footage, accident reconstruction analysis, or expert witness testimony — particularly in disputed or close-call cases.

How to Calculate What Your Claim Against the At-Fault Driver Is Actually Worth

Most accident victims significantly undervalue their own claims because they only count what they can see right now — the current medical bills and the car damage. A complete claim is much broader than that.

The compensation you’re entitled to recover from the at-fault driver’s liability insurance includes:

Economic damages are your measurable, documented losses: all medical bills from the accident including emergency care, hospitalization, surgeries, medication, and physical therapy; vehicle repair or replacement costs; rental car expenses; and lost wages from work you missed while recovering.

Future economic damages apply in more serious cases: projected medical costs for ongoing treatment, and lost future earning capacity if the injuries create a lasting limitation on your ability to work.

Non-economic damages cover what can’t be invoiced: physical pain and suffering, emotional distress, loss of enjoyment of life, and the impact the injuries have on your relationships and daily activities. Insurance companies may argue that non-economic damages or certain damages are minor or irrelevant — and without a personal injury attorney, victims may end up signing away rights or accepting offers that leave them unable to address the actual costs and consequences of their accident.

It’s crucial to understand that insurance policies have specific coverage limits, which dictate the maximum payout for a claim. For instance, property damage coverage in a policy may be capped at $20,000, while bodily injury coverage might be limited to $15,000 per person and $30,000 total per accident. If the at-fault driver’s policy limits are insufficient to cover your full losses, you can pursue the difference through your own uninsured/underinsured motorist coverage.

Write all of your losses down in a running total before you engage in any negotiation. That number is your baseline — nothing below it should be accepted without understanding exactly why.

How to Write and Send a Demand Letter to the At-Fault Driver’s Insurer

Once your medical treatment is complete — or you’ve reached maximum medical improvement — it’s time to make a formal demand. This is the document that kicks off serious settlement negotiations.

A demand letter is a written document sent to the at-fault driver’s insurance company that lays out the facts of the accident, establishes the other driver’s liability, documents your injuries and losses, and states the amount of compensation you are demanding. A well-written letter backed by a mountain of evidence can truly get an insurance adjuster’s attention. Having everything organized from the start shows you’re serious and have a firm grasp on what your claim is worth.

The letter should include: a factual description of the accident; a clear explanation of how the other driver’s negligence caused it; your complete list of injuries and treatment; all documented expenses and losses; your pain and suffering; and a specific dollar amount you are demanding as settlement.

Once you’ve explained what happened, connect the facts to a specific act of negligence by their insured — reference specific traffic laws. In a rear-end collision, for instance, cite the driver’s duty to maintain a safe following distance. Point to the police report that cites the other driver for a violation. Make the direct link between their alleged negligence and the accident itself.

Insurance companies typically respond to a demand letter within 30 to 60 days, especially in straightforward injury claims. Larger claims, serious injuries, and higher policy limits usually mean slower responses. Silence is often a negotiation tactic — not a rejection.

The insurance company can respond in three primary ways: by accepting the demand, issuing a counteroffer, or denying the claim. A counteroffer is the most common outcome and the start of negotiation — not the end of it.

Most accident victims benefit significantly from having a personal injury attorney draft the demand letter. A lawyer knows what adjusters look for, how to frame the evidence, and what dollar ranges are realistic for your type of injury in your state.

Once your demand letter is in, the negotiation clock starts. If the insurer delays, disputes liability, or makes an offer far below your documented losses, a car accident lawyer can apply legal pressure and protect your right to file suit before the statute of limitations runs out.

What to Do When the At-Fault Driver’s Insurance Company Disputes or Denies Your Claim

A disputed or denied claim is not the end of the road. It is one of the most common steps in the process — and it has a clear playbook.

The other driver’s insurance company might say their driver wasn’t at fault and refuse to pay you. They may say both drivers were at fault and want you to pay some of your costs. They might say their driver doesn’t have enough insurance to pay all your costs. Or they might not return your calls or emails.

If they dispute liability or your level of fault, request their reasoning in writing. Then gather counter-evidence that addresses each specific point they raise. Traffic camera footage, additional witness statements, and independent accident reconstruction can all shift a disputed determination.

If they simply delay, escalate. If your adjuster stops responding or the claim stalls, escalate to their supervisor. Document all communication attempts including dates, times, and methods. If delays continue, file a complaint with your state’s Department of Insurance. Insurance regulators take complaints seriously, and companies often resolve claims quickly after regulatory involvement. You can also send a demand letter setting a reasonable deadline for response, typically 10 to 15 business days.

If the insurer continues to stall or refuses a fair settlement, filing a lawsuit moves the case into the legal system where a judge or jury — not the adjuster — decides what you’re owed. An experienced attorney knows how to deal with an at-fault driver’s insurance company and can push back when they try to shift or deny blame. They can negotiate a final settlement and also initiate a formal lawsuit if the insurance company continues to deny your claim or refuses to offer an appropriate settlement.

Filing suit does not always mean going to trial. Many cases settle after a lawsuit is filed because the insurer wants to avoid the cost and unpredictability of litigation.

Learn more about your rights as a personal injury claimant after a car accident, ALso read our guide on how to deal with the at-fault driver’s insurance company Another guide article on what not to say to your insurance company after an accident

How Long You Have to File a Claim Against an At-Fault Driver Before the Deadline Expires

Missing the legal deadline to file means losing your right to compensation permanently — regardless of how clear the other driver’s fault is. This is one deadline you cannot afford to treat casually.

Every state has its own statute of limitations for injury cases, including car accident lawsuits. The deadlines range from one to six years from the date of the incident, with many states following a two-year time limit. Confirm current deadlines for all states, particularly Florida’s post-2023 two-year rule

The clock generally starts on the date of the accident. Missing it by even one day results in the court dismissing your case, no matter how strong your evidence is.

Beyond the lawsuit deadline, your own insurance policy almost certainly requires you to report the accident promptly — often within 24 to 72 hours. And the at-fault driver’s insurer, while not legally bound by a strict notice deadline from you as a third party, can make evidence gathering significantly harder the longer you wait.

Simple single-vehicle accidents or clear-fault collisions resolve in under 21 days on average. Disputed liability, injuries, or total-loss determinations stretch the timeline to 30 to 90 days. Litigation pushes resolution past 12 months in the most complex cases.

The practical advice: do not wait. Evidence degrades. Witnesses forget. And once the statute of limitations expires, no attorney in the country can help you recover what you lost.

Frequently Asked Questions

How do I start a claim against the at-fault driver’s insurance if I don’t have their policy number?

 If you couldn’t get the other driver’s insurance card at the scene, request the information from the police report — officers typically record insurance details for all drivers involved. You can also contact your state’s DMV, which may provide insurance information from an accident report. A lawyer can also help locate coverage information for you.

How long does a third-party insurance claim against an at-fault driver typically take to settle? 

Straightforward claims with clear liability resolve in as little as two to four weeks. Claims involving injuries, disputed fault, or significant damages typically take three to six months. Cases that require litigation can take a year or more. Thorough documentation from the beginning consistently shortens the timeline.

Do I need a personal injury attorney to file a claim against an at-fault driver, or can I handle it myself? 

For minor accidents with no injuries and undisputed fault, self-filing is possible. For any claim involving medical treatment, disputed fault, or a settlement offer that seems low, an attorney consistently produces better results — and most work on contingency, meaning no upfront cost to you.

What if the at-fault driver had no insurance or not enough coverage to pay my claim?

 File a claim with your own insurer under your uninsured or underinsured motorist coverage if you carry it. You can also file a civil lawsuit directly against the at-fault driver. An attorney can advise whether that route is practical given the driver’s ability to pay.

Can I still recover compensation if I was partially at fault for the accident?

 In most states, yes. Modified comparative negligence — the most common system — allows you to recover damages as long as your fault does not exceed 50% or 51%, depending on the state. Your compensation is reduced proportionally by your percentage of fault. In Alabama, Maryland, North Carolina, Virginia, and D.C., even minimal fault can bar recovery entirely under contributory negligence rules.

What happens after I send a demand letter to the at-fault driver’s insurance company?

 Most insurers respond within 30 to 60 days. The response will be one of three things: they accept your demand, they issue a counteroffer, or they deny the claim. A counteroffer begins the negotiation process. A denial opens the door to filing a lawsuit. Silence beyond 60 days should be escalated immediately.

What is the statute of limitations for filing a claim against an at-fault driver?

 Most states set a two-year deadline from the date of the accident for personal injury claims, though it ranges from one to six years depending on the state. Property damage claims sometimes carry a different deadline. Missing the statute of limitations permanently bars you from recovering compensation through the courts, regardless of the strength of your evidence. Check your state’s specific deadline immediately.

Legal Terms Used in This Article

Third-Party Claim: A claim filed with an insurance company on behalf of someone other than their own policyholder — in this context, a claim you file against the at-fault driver’s insurer. You have no contract with them, and they are under no obligation to treat you as a customer.

Liability Insurance: The coverage that every driver is legally required to carry in most states. It pays for damages the policyholder causes to others when they are at fault in an accident.

Statute of Limitations: The legal deadline by which you must file a lawsuit. Missing it by even one day permanently bars you from pursuing compensation through the courts.

Demand Letter: A formal written document sent to the at-fault driver’s insurance company requesting a specific dollar amount as settlement. It outlines the facts, establishes liability, and documents all losses. It is the opening move in serious settlement negotiation.

Comparative Fault: The rule used in most states that allows you to recover compensation even if you were partially responsible for the accident, with your payout reduced by your percentage of fault.

Contributory Negligence: The stricter rule used in Alabama, Maryland, North Carolina, Virginia, and D.C., where any fault on your part — even 1% — can completely bar you from recovering compensation.

Subrogation: The process by which your own insurance company, after paying your claim, pursues reimbursement from the at-fault driver’s insurer on your behalf.

Uninsured/Underinsured Motorist Coverage: Your own policy’s coverage that pays when the at-fault driver has no insurance or insufficient insurance to cover your full losses.

Contingency Fee: A fee arrangement where your attorney is paid only if you win. There is no upfront cost — the lawyer’s fee comes as a percentage of the settlement or verdict.

You now know exactly how to file a claim against an at-fault driver — from collecting evidence at the scene to sending a demand letter and pushing back when the insurer doesn’t play fair. If your injuries are serious, fault is disputed, or the settlement offer falls short of your actual losses, you don’t have to navigate that fight alone. Visit AllAboutLawyer.com to connect with a personal injury attorney in your area — and find out what your claim is actually worth before you agree to anything.

Prepared by the AllAboutLawyer.com Editorial Team and reviewed for factual accuracy against official government and court sources on May 2, 2026. Last Updated: May 2, 2026

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Laws vary by state and individual circumstances differ. For advice regarding your specific situation, consult a qualified attorney licensed in your state.