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Underinsured Motorist Coverage in Texas: What to Do When the At-Fault Driver's Liability Limits Fall Short

By Accident Atlas Editorial Team · Reviewed by Phil Ayres · Updated July 13, 2026 · 9 min read

Decision Snapshot: Is Your UM/UIM Coverage Enough?

When another driver causes a crash but doesn't carry enough liability insurance to cover your damages, Texas law has a specific term for that situation: the at-fault driver's vehicle is an "underinsured motor vehicle" whenever its per-person or per-accident liability limits are lower than your own uninsured/underinsured motorist (UM/UIM) limits (Tex. Ins. Code § 1952.103). Texas requires insurers to offer UM/UIM coverage on every auto policy sold in the state unless the policyholder rejects it in writing (Tex. Ins. Code § 1952.101).

Before you do anything else, pull your declarations page — the summary sheet at the front of your policy — and look at three numbers: your liability limits, your UM/UIM limits, and your deductibles (TDI Auto Insurance Guide). Then take these immediate steps: confirm whether the at-fault driver's limits are lower than yours, calculate the dollar gap between your damages and what their insurer will pay, and verify your own UM/UIM limit before you file a claim.

What Makes a Motorist 'Underinsured' Under Texas Law

Under Texas Insurance Code § 1952.103, an "underinsured motor vehicle" is one with collectible liability coverage that was originally lower than your UM/UIM policy limit — or has been reduced below that limit by payouts to other people injured in the same accident. That second part matters: a driver who appeared to have adequate coverage can still be legally "underinsured" if their insurer already paid out a portion of the policy to other claimants from the same crash, leaving too little left for you.

Critically, the benchmark used to decide whether the other driver counts as underinsured isn't the state minimum — it's your own UM/UIM limit. If your UM/UIM limit is higher than the at-fault driver's remaining liability coverage, that driver is underinsured as to you, even if their coverage would look sufficient against someone else's smaller policy.

How Texas UM/UIM Coverage Is Required to Work

Texas law requires UM/UIM coverage to be offered at limits at least equal to the minimums set out in Chapter 601 of the Transportation Code (Tex. Ins. Code § 1952.105(c)). Policies must also cap the total aggregate liability to any one person for bodily injury or property damage from a single accident, regardless of how many people, vehicles, or claims are involved (Tex. Ins. Code § 1952.104).

The payment mechanism itself is spelled out in Tex. Ins. Code § 1952.106: underinsured motorist coverage must pay the insured all amounts they are legally entitled to recover as damages, up to the UIM policy limit, minus whatever has been recovered or is recoverable from the at-fault driver's own insurer. In practice, this means UIM coverage fills the gap between what the at-fault insurer pays and your actual damages — it does not stack on top of the at-fault payout dollar-for-dollar up to your full UIM limit. If your damages are $100,000, the at-fault driver's insurer pays $30,000, and your UIM limit is $100,000, your UIM carrier owes the remaining $70,000 — not an additional $100,000.

Setting Your UM/UIM Limits to Match Your Exposure

Insurers must offer bodily injury UM/UIM limits in whatever amount you request, but they cannot offer more than your own bodily injury liability limits (Tex. Ins. Code § 1952.105(a)). Property damage UM/UIM coverage works the same way — it must be offered up to your own property liability limits, subject to a $250 deductible (Tex. Ins. Code § 1952.105(b)).

This creates a direct link between the two coverages: because your UM/UIM ceiling is tied to your own liability limits, raising your liability coverage is often a necessary first step before you can raise your UM/UIM protection. Texas's state-minimum liability limits are 30/60/25 — $30,000 per person and $60,000 per accident for bodily injury, plus $25,000 for property damage — and UM/UIM dollar limits are capped in the same way (TDI Auto Insurance Guide). If you only carry state-minimum liability, you can only carry state-minimum UM/UIM.

Collision vs. UM Property Damage: Choosing (or Combining) Coverage After a Crash

If you carry both collision coverage and UM/UIM property damage coverage, Texas law lets you choose which one to recover under after a crash (Tex. Ins. Code § 1952.107(a)). But if neither coverage alone is enough to cover the full loss from a single occurrence, you're allowed to recover under both — the statute just requires you to designate one as primary, exhaust it first, and pay its deductible before the secondary coverage kicks in (Tex. Ins. Code § 1952.107(b)).

This choice becomes relevant specifically when the at-fault driver's property damage limits are exhausted and your own collision deductible or limit also falls short of covering your vehicle damage. Coordinating the two coverages, rather than picking blindly, can reduce what comes out of your pocket.

Why the State-Minimum Policy Often Leaves a Gap

Liability, personal injury protection (PIP), and UM/UIM coverages all carry hard dollar limits — the insurer pays no more than the stated limit even if your actual damages are higher, and you're responsible for the difference (TDI Auto Insurance Guide). Collision and comprehensive coverage don't carry that same kind of dollar-limit shortfall exposure, since they're generally tied to your vehicle's value rather than a fixed cap that can fall short of a large injury claim.

Your declarations page — the first page of your policy — lists your exact coverages, dollar limits, and deductibles. Reviewing it before a claim, not after, is the fastest way to spot a potential shortfall while you still have time to raise your limits.

Special Situations That Change the UM/UIM Calculus

Rideshare and transportation network company (TNC) drivers face a specific gap: insurers may lawfully exclude coverage under a personal auto policy for losses that occur while the driver is logged into a TNC's digital network or engaged in a prearranged ride (Tex. Ins. Code § 1954.151). That exclusion can apply to liability, PIP, UM/UIM, medical payments, and physical damage coverage alike — meaning your personal UM/UIM may not respond to a crash that happens while you're working for a rideshare platform.

Rental cars raise a similar wrinkle. Your own auto policy's liability or comprehensive coverage might extend to a rental car used for personal purposes, but exclusions can limit or reduce that coverage — so it's worth asking your agent before assuming your UM/UIM travels with you into a rental (TDI Auto Insurance Guide). It also helps to remember that the rental agency's own damage waiver isn't insurance at all; it's simply a contractual agreement that the agency won't charge you for damage to the car, separate from any liability policy the agency may also offer.

If No Insurer Will Sell You a Policy: The TAIPA Fallback

If two insurance companies have turned you down, Texas provides a backstop: the Texas Automobile Insurance Plan Association (TAIPA) (TDI Auto Insurance Guide). TAIPA sells liability, personal injury protection, and uninsured/underinsured motorist coverage, but it does not sell collision or comprehensive coverage.

It's important to understand TAIPA's limits before relying on it: TAIPA cannot sell UM/UIM coverage above the state-required minimums, and its policies cost more than those from standard insurers. If your potential damages exceed the state minimum, TAIPA coverage alone may leave the same kind of gap this article is about — it's a fallback for obtaining coverage at all, not a solution for maximizing UM/UIM protection.

Deadlines That Run While You're Sorting Out a UM/UIM Shortfall

Sorting out whether a driver is underinsured, and negotiating a UM/UIM claim, can take time — but the legal deadlines for pursuing your case in court don't pause while that happens. A personal injury lawsuit arising from a Texas motor-vehicle crash generally must be filed within 2 years of the crash (Tex. Civ. Prac. & Rem. Code § 16.003(a)), and a wrongful-death lawsuit must be filed within 2 years of the death (Tex. Civ. Prac. & Rem. Code § 16.003(b)).

If a governmental unit's vehicle was involved in the crash, formal written notice must be given within 6 months of the crash (Tex. Civ. Prac. & Rem. Code § 101.101) — a far shorter window than the two-year lawsuit deadline. These deadlines run independently of how long your UM/UIM claim negotiation takes, so don't wait for your insurer to finish evaluating underinsured status before protecting your filing deadline.

Next Steps Checklist

Pull your declarations page and compare your UM/UIM limit to the at-fault driver's known or estimated liability limit. Confirm whether the at-fault vehicle meets the statutory definition of "underinsured" — limits that were originally lower than your UM/UIM limit, or reduced below it by payouts to other claimants from the same accident. Decide whether to raise your liability and UM/UIM limits together, since UM/UIM can't legally exceed your own liability limits.

If you were driving for a rideshare platform or in a rental car at the time of the crash, verify which policy applies before assuming personal UM/UIM coverage responds. If no standard insurer will write you a policy, look into TAIPA eligibility — two prior rejections — as a coverage option. And calendar the 2-year lawsuit deadline, or the 6-month notice deadline for claims against a governmental unit, immediately and independently of how the insurance claim timeline unfolds.