Colorado Auto Insurance: What the 25/50/15 Minimums Mean and Why UM/UIM Is Optional

Colorado requires every driver to carry auto liability insurance meeting minimum limits of 25/50/15 under CRS § 42-7-103. Every licensed insurance producer in Colorado who sells personal auto coverage needs to understand exactly what those three numbers mean, what they do and do not cover, why the minimums are widely considered inadequate for serious accidents, and why Colorado's approach to uninsured and underinsured motorist coverage — optional by default inclusion — is one of the most consequential coverage decisions a Colorado auto insurance client makes. This post covers the full Colorado auto insurance framework: the mandatory minimums, the optional coverages, the at-fault liability system, the uninsured driver problem, and the legal context within which every Colorado auto claim is resolved.

What 25/50/15 Actually Means

The three numbers in Colorado's minimum liability requirement each represent a dollar limit on what your liability insurer will pay to other people when you cause an accident. They apply exclusively to third-party claims — other people's injuries and property damage. They do not pay for your own injuries, your own vehicle damage, or any other first-party loss you sustain.

$25,000 per person for bodily injury: The maximum your liability insurer will pay for injuries — including medical bills, lost wages, pain and suffering, and related damages — sustained by any single person in an accident you cause. If one person sustains $80,000 in injuries and losses, your minimum policy pays $25,000 and you are personally responsible for the remaining $55,000.

$50,000 per accident for bodily injury: The maximum your liability insurer will pay in total for all bodily injury claims arising from a single accident. If three people are injured and each has $30,000 in damages (total $90,000), your minimum policy pays $50,000 total — distributed across the three claimants — and you are personally responsible for the remaining $40,000. The per-person limit and the per-accident limit work together: no single claimant can recover more than $25,000 regardless of the per-accident aggregate, and the total for all claimants cannot exceed $50,000.

$15,000 per accident for property damage: The maximum your liability insurer will pay for damage you cause to other people's property — vehicles, fences, buildings, utility poles — in a single accident. The average new vehicle price in the United States exceeded $48,000 in recent years. A single-vehicle collision with a new car can exhaust the $15,000 property damage limit before repairs are complete, leaving you personally liable for the remainder.

What the minimum does NOT cover:

Your own medical expenses after an accident you caused

Your own vehicle damage after an accident you caused

Your own injuries or vehicle damage caused by another driver (covered by UM/UIM and collision, respectively)

Any claim above the stated limits — personal liability for amounts over the policy limits falls on you

Colorado Is an At-Fault State

Colorado operates under an at-fault (tort) liability system. The driver determined to be responsible for causing an accident is financially liable for the resulting damages — medical expenses, lost wages, pain and suffering, property damage, and other compensable losses. The at-fault driver's liability insurance pays those damages on their behalf, up to the policy limits.

This is the fundamental reason liability insurance exists: to fund the at-fault driver's financial responsibility to others. When Colorado requires 25/50/15, it is requiring that every driver have a minimum financial backstop for the harm they might cause to others.

The contrast with no-fault states: In no-fault states (such as Florida, Michigan, and New York), each driver's own insurance pays for their own injuries regardless of who caused the accident, through Personal Injury Protection (PIP). No-fault systems reduce the volume of litigation over minor accidents by removing the need to establish fault before receiving payment. Colorado does not use a no-fault system — there is no PIP requirement, and injured parties in Colorado must generally establish the other driver's fault before recovering from that driver's liability insurer.

Modified Comparative Negligence: The 50% Bar Rule

Colorado follows modified comparative negligence with a 50% bar under CRS § 13-21-111. This rule governs what happens when fault for an accident is shared between multiple parties.

Under this rule:

A plaintiff (injured party) who is 50% or less at fault may recover from the defendant, but their recovery is reduced proportionally by their own fault percentage. A plaintiff who is 30% at fault recovers 70% of their proven damages.

A plaintiff who is more than 50% at fault is completely barred from recovery. If a court determines the plaintiff was 51% responsible for the accident, they recover nothing from the defendant.

Why this matters for auto insurance producers: The 50% bar rule affects how UM/UIM coverage is valued in Colorado. In Virginia, pure contributory negligence means any fault by the injured party completely bars recovery — making UM/UIM coverage critical even for minor shared-fault scenarios. In Colorado's modified comparative negligence system, injured parties who are 50% or less at fault retain some recovery right against the at-fault driver. UM/UIM coverage fills the gap when the at-fault driver is uninsured or underinsured — not when the injured party is primarily at fault.

Diminished value: Colorado is one of approximately 15 states that recognize diminished value claims. A vehicle that has been in an accident and repaired loses market value compared to an equivalent undamaged vehicle — even if the repairs are perfect. Under Colorado law, an at-fault driver's property damage liability may include the diminished value of the damaged vehicle, not just the repair cost. Producers advising clients on property damage liability limits should account for this: the $15,000 minimum may need to cover both repair costs and a diminished value claim.

The Uninsured Driver Problem in Colorado

Between 13% and 17% of Colorado drivers are estimated to be operating without insurance at any given time, depending on the source. The Colorado DOI acknowledges approximately 13% uninsured; other industry sources estimate as high as 16–17%. In practical terms, roughly one in six to one in eight drivers on Colorado roads does not carry the legally required liability insurance.

The consequences for an insured driver hit by an uninsured motorist are significant under an at-fault system with no mandatory UM coverage:

The uninsured driver has no insurance to pay the insured driver's damages

The insured driver must pursue the uninsured driver personally — typically through a civil lawsuit

Most uninsured drivers lack the assets to satisfy a judgment

The insured driver absorbs their own medical expenses, lost wages, and vehicle damage out of pocket or through their own health insurance and collision coverage

This is the problem that UM/UIM coverage solves. It transfers the financial risk of another driver's inadequate coverage to the insured's own insurer, which has the resources to pay the claim.

UM/UIM Coverage: Optional but Default-Included

The Colorado DOI's own auto insurance page states this directly: "Uninsured/underinsured motorist (UM/UIM) coverage is optional in Colorado." This is the operative legal rule. Colorado does not require drivers to carry UM/UIM coverage.

However, optional does not mean absent. Colorado law requires that UM/UIM coverage be automatically included in every Colorado auto insurance policy at limits matching the policyholder's bodily injury liability limits — unless the policyholder explicitly rejects it in writing. The insurer cannot omit UM/UIM coverage from a new policy without a written rejection from the policyholder.

The default-inclusion mechanism: When a new auto policy is issued in Colorado, UM/UIM coverage is included automatically. The policyholder receives UM/UIM protection from day one. If the policyholder does not want it — typically to reduce premium — they must sign a written rejection form. Only upon receipt of that signed written rejection can the insurer remove UM/UIM from the policy.

The practical result: Most Colorado drivers who purchase through a licensed producer have UM/UIM coverage unless they specifically rejected it. Drivers who purchase minimum coverage through automated online platforms without reviewing policy options may inadvertently reject UM/UIM without understanding what they have declined.

How UM and UIM Coverage Work in Colorado

Uninsured Motorist (UM) Coverage pays the insured's bodily injury damages when the at-fault driver has no insurance at all, including hit-and-run accidents where the responsible driver cannot be identified. Colorado UM coverage does not pay for property damage — it covers bodily injury only unless a property damage UM endorsement is specifically added.

Underinsured Motorist (UIM) Coverage pays when the at-fault driver has insurance but their limits are insufficient to cover the insured's proven damages. Colorado UIM operates on an offset basis — UIM pays the difference between what the at-fault driver's liability coverage paid and the insured's UIM limit, not the full UIM limit in addition to the liability payment.

Example of Colorado UIM offset: An insured has $100,000 UIM coverage. The at-fault driver has $25,000 bodily injury liability, which is exhausted by the claim. The insured's proven damages total $80,000. The at-fault driver's insurer pays $25,000. The UIM insurer pays the difference: $80,000 − $25,000 = $55,000. Total received: $80,000. The insured does not receive the full $100,000 UIM limit plus the $25,000 liability payment — the UIM pays only what the liability did not.

Minimum UM/UIM limits: The minimum UM/UIM limits a policyholder can purchase in Colorado are $25,000 per person and $50,000 per accident — matching the state's minimum bodily injury liability limits. The policyholder may purchase higher UM/UIM limits but cannot purchase UM/UIM limits that exceed their own bodily injury liability limits. A driver with $100,000/$300,000 bodily injury liability can purchase UM/UIM up to $100,000/$300,000.

UM/UIM follows the insured, not the vehicle: Colorado UM/UIM coverage protects the named insured and resident relatives whether they are occupants of the insured vehicle, occupants of another vehicle, or pedestrians. A policyholder struck while walking is covered under their own UM coverage if the responsible driver is uninsured.

MedPay: Optional but Must Be Offered

Colorado law requires that every auto insurer offer Medical Payments (MedPay) coverage with a minimum limit of $5,000. Unlike UM/UIM, MedPay is not automatically included — it must be affirmatively selected. But the offer must be made, and the policyholder must decline it in writing if they do not want it.

MedPay pays for medical expenses of the named insured and passengers injured in the covered vehicle, regardless of fault. It is no-fault first-party medical coverage — it pays without requiring a determination of which driver caused the accident. Common uses: immediate payment of emergency room bills, deductibles on health insurance, medical costs incurred before a liability settlement is reached.

MedPay is not a substitute for health insurance and is not a substitute for UM/UIM. It fills a specific gap — prompt payment of medical expenses without fault determination — that both health insurance and liability coverage often fail to fill immediately after an accident.

SR-22: The Financial Responsibility Certificate

An SR-22 is not an insurance policy — it is a certificate filed by an insurer with the Colorado DMV certifying that a specific driver carries at least the minimum required liability coverage. The DMV is notified immediately by electronic transmission if the underlying policy lapses.

Colorado requires SR-22 filing for drivers who have:

Been convicted of driving without insurance

Had their license suspended for insurance-related violations

Certain DUI/DWAI convictions

Other serious traffic violations requiring proof of financial responsibility

SR-22 is typically required for three years from the date of the triggering violation with no lapse in coverage. The filing fee is modest ($15–$50) but the underlying policy premiums are substantially higher for SR-22 drivers because the SR-22 requirement signals elevated risk to insurers.

Colorado does not use FR-44: Some states (notably Virginia and Florida) require an FR-44 for DUI-related violations — a certificate requiring coverage at higher-than-minimum limits. Colorado uses only SR-22, which certifies coverage at the standard minimum limits regardless of the underlying violation.

What the Minimums Leave Out: The Coverage Gap Problem

Colorado's 25/50/15 minimums were established when medical costs, vehicle values, and litigation awards were substantially lower. In the current environment:

A single emergency room visit and overnight hospital stay following a serious collision routinely exceeds $25,000. Surgeries, rehabilitation, and long-term care can reach hundreds of thousands of dollars. The $25,000 per-person bodily injury limit is exhausted by one night of intensive care.

The average new vehicle price exceeds $48,000. The $15,000 property damage limit does not cover the full replacement cost of most new vehicles. A two-vehicle accident where both vehicles are newer models can generate property damage claims that exceed the minimum limit for each vehicle alone.

Colorado producers advising clients on coverage adequacy should frame the minimum coverage conversation around these realities: minimum coverage satisfies the legal requirement, but it transfers significant personal financial risk to the policyholder in any serious accident. The gap between 25/50/15 and meaningful financial protection is wide. Coverage recommendations of $100,000/$300,000 bodily injury liability and $100,000 property damage — with matching UM/UIM limits — represent a more defensible standard of protection for most Colorado drivers.

Frequently Asked Questions

Why does Colorado not require UM/UIM coverage if so many drivers are uninsured?

Colorado's approach reflects a policy balance between consumer choice and consumer protection. Mandating coverage increases premiums for all drivers — including those who believe they have adequate protection through other means (personal health insurance, significant assets, or existing umbrella coverage). The default-inclusion mechanism addresses the consumer protection concern by ensuring UM/UIM is present unless actively rejected, without imposing it on drivers who make an informed choice to decline. The practical result is that most drivers who engage with a licensed producer carry UM/UIM because the default-inclusion ensures it is part of the initial policy — the burden to remove it requires affirmative action.

Can a Colorado driver carry UM/UIM limits higher than their liability limits?

No. Colorado law requires that UM/UIM limits cannot exceed the policyholder's bodily injury liability limits. A driver with $25,000/$50,000 bodily injury liability can carry a maximum of $25,000/$50,000 UM/UIM. A driver with $250,000/$500,000 bodily injury liability can carry up to $250,000/$500,000 UM/UIM. This rule prevents a situation where the insured's own insurer might have greater exposure for the insured's injuries than the insured has to others — a construct that would create perverse incentives. Producers advising clients to increase UM/UIM limits must simultaneously recommend increasing liability limits to match.

What happens when the at-fault driver's liability limits are the same as my UIM limits — do I receive anything from my UIM insurer?

Under Colorado's offset approach, if the at-fault driver's liability limits equal your UIM limits and the liability insurer pays its full limits, your UIM insurer owes nothing because the at-fault driver's payment equals your UIM coverage amount. For UIM to pay anything, your proven damages must exceed what the at-fault driver's liability insurer paid. This is why producers advising clients to purchase UIM coverage at $100,000/$300,000 should also advise clients that an at-fault driver who carries $100,000/$300,000 liability limits — equal to the client's UIM — would exhaust the UIM coverage's gap-filling function entirely. Purchasing UIM at limits meaningfully higher than the minimums most drivers carry creates the most practical protection.

Does Colorado's UM coverage apply in a hit-and-run accident where the other driver fled?

Yes. Colorado UM coverage explicitly covers hit-and-run accidents where the at-fault driver cannot be identified. The insured's own UM insurer stands in for the unidentified driver and pays the insured's bodily injury damages up to the UM policy limits. Most Colorado UM policies require the insured to report the hit-and-run to law enforcement promptly — typically within 24 hours — and to cooperate with the insurer's investigation. A policyholder who fails to report a hit-and-run may face a claim dispute on the UM claim, though the specific requirements vary by policy form.

If my client rejects UM/UIM in writing to save money, what should I document?

When a Colorado client declines UM/UIM coverage, best practice is to document the conversation thoroughly: the date the rejection was discussed, the specific coverage being rejected, the client's acknowledged understanding of the uninsured driver rate in Colorado and the coverage being waived, and the signed written rejection form. Some producers retain a client file note summarizing the conversation in addition to the required written rejection form. This documentation protects the producer from an E&O claim if the client later suffers an injury caused by an uninsured driver and claims they were never advised of what UM/UIM covers. The written rejection is legally required to remove UM/UIM from the policy — the additional documentation is professional practice that protects both parties.

Colorado's 25/50/15 minimums establish the legal floor for auto insurance in the state. For most Colorado drivers — particularly those with assets to protect, health plans with high deductibles, or regular exposure to Colorado's Front Range traffic — that floor is meaningfully below the coverage that provides genuine financial protection. Understanding exactly what the minimums cover, what they leave out, and how UM/UIM fills the gap between minimum liability and real-world accident costs is the foundation of every productive Colorado auto insurance coverage conversation.

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