Suing an Uninsured or Underinsured Motorist (UM/UIM) in Texas: Timelines & Process

Driving in Texas carries a hidden risk that most people never consider until it is too late. Despite strict state laws requiring liability insurance, statistics show that up to one in five drivers in Texas is operating their vehicle completely illegally, with no insurance whatsoever. Even worse, many drivers who do carry insurance only buy the state minimum requirement of $30,000, which is barely enough to cover a single night in a hospital trauma center. If a negligent driver blows through a red light and shatters your leg, and they have no insurance, you cannot squeeze blood from a turnip. Suing a broke driver directly is a waste of time. Your only financial safety net is Uninsured/Underinsured Motorist (UM/UIM) coverage.

The Legal Framework of UM/UIM in Texas

Because the risk of uninsured drivers is so massive, Texas law mandates that every auto insurance provider must offer UM/UIM coverage. Under Tex. Ins. Code § 1952.101, this coverage is automatically included in your policy unless you reject it in writing. When you file a UM/UIM claim, your own insurance company essentially steps into the legal shoes of the at-fault driver. A critical element of Texas UM/UIM law was established in the landmark case Brainard v. Trinity Universal Ins. Co., 216 S.W.3d 809 (TX Supreme Court 2006). The court ruled that an insurance company is not legally obligated to pay a UM/UIM claim until the driver is legally proven to be at fault and uninsured, which often forces injured Texans to take their own insurance companies to court to secure fair compensation.

Bodily Injury vs. Property Damage (UMBI vs. UMPD)

UM/UIM coverage is generally split into two distinct categories, covering both your physical body and your vehicle.

Uninsured Motorist Bodily Injury (UMBI)

If you suffer a concussion, broken bones, or spine injuries, UMBI pays for your hospital bills, physical therapy, lost wages, and pain and suffering. It also covers any passengers inside your vehicle at the time of the crash. If the at-fault driver has a tiny $30,000 policy, but your medical bills are $100,000, your Underinsured (UIM) coverage kicks in to cover the remaining $70,000 gap, up to your policy limits.

Uninsured Motorist Property Damage (UMPD)

If an uninsured driver totals your car, UMPD covers the cost to repair or replace your vehicle. Importantly, Texas law dictates that UMPD claims are subject to a mandatory $250 deductible. Even if the crash was 100% the other driver's fault, you will have to pay the first $250 out of pocket to get your car fixed, and your insurer covers the rest.

Stacking UM/UIM Limits (The Anti-Stacking Law)

A common question is whether an injured driver can 'stack' insurance policies to expand available coverage. In Texas, the law distinguishes between intra-policy stacking and inter-policy stacking. Intra-policy stacking-multiplying coverage limits based on the number of vehicles insured under a single policy-is strictly prohibited under Upshaw v. Trinity Cos., 842 S.W.2d 631 (TX Supreme Court 1992). If you pay for $50,000 of UM coverage on three vehicles under a single policy, you cannot combine them to create a $150,000 safety net for a single crash.

In contrast, inter-policy stacking across separate, distinct insurance policies is permitted in Texas under American Motorists Ins. Co. v. Briggs, 514 S.W.2d 233 (TX Supreme Court 1974). If your actual damages exceed the limits of the primary vehicle policy, you may stack coverage from an independent policy under which you are an insured, such as a spouse's or household family member's separate policy.

Step-by-Step Guide to Filing a UM/UIM Claim

Filing a claim against your own insurance company can feel like a betrayal, as they will fight just as hard to deny your claim as the opposing insurance company would.

Step 1: Call the Police and Verify Insurance

You must have a police report to successfully file a UM/UIM claim. The officer will ask the at-fault driver to produce standard proof of insurance. If the driver is uninsured, the officer documents this on the official accident report (Form CR-3, Texas, Department of Transportation, Texas Peace Officer's Crash Report), which serves as your primary proof when submitting a claim to your insurance company.

Step 2: Seek Medical Treatment Immediately

Your insurance company will heavily scrutinize your medical records. Any gap in treatment will be used to argue that your injuries were not caused by the crash. Follow all doctor's orders meticulously.

Step 3: Send a Policy Limits Demand

Your attorney will draft a formal policy limits demand letter to your insurance carrier, presenting comprehensive medical records, proof of lost wages, and evidence that the at-fault motorist lacked sufficient insurance. However, under Texas law, an insurer has no legal obligation to pay UM/UIM benefits until the other driver's fault and the extent of your damages are formally adjudicated. Because benefits are not yet legally due at the demand stage, an insurer's refusal to settle does not constitute a violation of the Texas Prompt Payment of Claims Act under Tex. Ins. Code § 542.058, nor does it trigger statutory penalty interest.

Step 4: File a Lawsuit Against Your Insurer

Because the Brainard decision established that an insurer does not breach its contract until third-party liability is legally determined, your attorney generally files a declaratory judgment action rather than a premature breach of contract claim. Brought under the Texas Uniform Declaratory Judgments Act, specifically Tex. Civ. Prac. & Rem. Code § 37.004, this lawsuit asks the court to establish the uninsured motorist's liability and fix the amount of damages. Filing in a venue such as the Dallas County District Court, Dallas or the Travis County District Court, Austin enables you to obtain the required judicial determination, while also allowing the court to award reasonable attorney fees under Tex. Civ. Prac. & Rem. Code § 37.009 as affirmed in Allstate Ins. Co. v. Irwin, 627 S.W.3d 263 (TX Supreme Court 2021).

How Much Does it Cost in Texas?

You do not need to pay an attorney out of pocket to file a UM/UIM claim. Personal injury attorneys handle these cases on a contingency fee, typically taking 33% to 40% of the final settlement. Because you are suing your own insurance company, the courts treat it as a breach of contract and personal injury hybrid. Filing the lawsuit will require standard court fees of $250 to $400, which the law firm advances. If the case requires expert witnesses to prove your long-term medical needs, those costs are also advanced by the firm.

Timelines for UM/UIM Payouts

UM/UIM cases can be frustratingly slow. If the other driver had a small policy, you must first completely exhaust their insurance before your UIM kicks in. Settling with the at-fault driver's minimal policy can take 4 to 8 months. Once you pivot to demanding UIM funds from your own carrier, they may stall. If you are forced to file a lawsuit to get a declaratory judgment establishing fault and damages, the entire UM/UIM process can take 12 to 24 months to fully resolve in a Texas courtroom.

Frequently Asked Questions (FAQ)