Montana Citizen's Guide to Auto Crash Insurance Calculations
This guide explains how a Montana citizen should analyze a serious crash: identify the at-fault liability stack, separate bodily-injury and wrongful-death claims from property claims, measure the effect of Montana's 25/50/20 minimum floor, apply Montana's modified comparative-negligence rule, and then determine what uninsured, family-member-exclusion, rideshare, employer, governmental, or umbrella coverages may change the real calculation.
On this page
- Montana crash-calculation frame
- Coverage cues that matter immediately
- Coverage ladder: minimum through commercial
- Post-crash calculation roadmap
- Scenario 1: multi-fatality minimum-limits matrix
- Minimum-limits equal-share illustration
- Property damage, bicycles, pets, and gear
- Montana UM and underinsured issues
- Pedestrians and bicyclists
- Higher tiers, umbrella, work use, TNC, and government claims
- Why disclosure still matters in Montana
- Authorities and links
Montana crash-calculation frame
Montana's ordinary personal-auto floor is 25/50/20: twenty-five thousand dollars for bodily injury or death to one person, fifty thousand dollars for bodily injury or death to two or more persons in one accident, and twenty thousand dollars for property damage in one accident. Montana also requires policies to insure the named insured and permissive users, subject to the statutory floor and the policy terms.
Montana separately requires uninsured motorist coverage unless the named insured rejects it in writing. Montana does not have the same broad statutory default for underinsured motorist coverage, so underinsured questions are more policy-driven than in states that build UIM directly into the statute. Montana also expressly allows a named family-member exclusion from liability coverage, which can drastically change the practical outcome for passengers inside the at-fault vehicle.
Minimum liability
25k bodily injury to one person, 50k bodily injury per accident, 20k property damage.
UM default
Montana requires uninsured-motorist bodily-injury coverage unless the named insured rejects it in writing.
Family-member exclusion
Montana expressly allows exclusion of a named family member from liability coverage.
Modified comparative negligence
A claimant may recover only if the claimant's negligence is not greater than the negligence of the person or combined negligence of all persons against whom recovery is sought.
Coverage cues that matter immediately after a crash
| Coverage item | Montana cue | Why it matters |
|---|---|---|
| Liability BI | 25/50 minimum | All third-party human bodily-injury and wrongful-death claims start here unless higher limits, umbrella, employer, rideshare, or commercial coverage exists. |
| Property damage | 20k minimum | Vehicle destruction, bicycles, child seats, electronics, and other property claims compete inside one property-damage coverage. |
| Uninsured motorist coverage | Required unless rejected | If the at-fault driver is uninsured, UM may become the main bodily-injury recovery source if the household did not reject it. |
| Underinsured issues | More policy-driven than UM | The injured household must inspect the declarations page and policy wording rather than assume a statutory UIM backstop. |
| Family-member exclusion | Expressly permitted | Passengers in the at-fault driver's own household may not stand in the same coverage position as strangers in the other vehicle. |
| Comparative negligence | 50-percent style bar | The plaintiff cannot recover if the plaintiff's negligence is greater than the negligence of the person or combined negligence of all persons against whom recovery is sought. |
Coverage ladder: minimum through commercial
| Tier | Typical stack | What the citizen should assume |
|---|---|---|
| Tier 0 | Uninsured / no liability policy | No liability coverage exists. The victim household must look to UM if retained, health coverage, direct claims against the driver or estate, and any owner or employer theories. |
| Tier 1 | Montana minimum PPA: 25/50/20 | This is the legal floor for ordinary personal auto coverage. In a multi-death or major-trauma crash it is usually catastrophic and quickly exhausted. |
| Tier 2 | Common mid PPA: 50/100/50 or similar | Still thin in a catastrophic case, but materially better than the floor. |
| Tier 3 | Common higher PPA: 100/300/100 or 100/300/300 | Often the first household-protection package that materially changes settlement posture. |
| Tier 4 | High PPA plus umbrella | Primary auto may be followed by umbrella or excess layers. Identifying all declarations pages matters. |
| Tier 5 | Commercial auto, employer fleet, TNC, or government stack | The whole claim changes if business use, employer coverage, transportation-network coverage, or governmental liability rules apply. |
Post-crash calculation roadmap
| Step | Question | Practical consequence |
|---|---|---|
| 1 | Who is claiming? | Separate the at-fault driver, family passengers, other vehicle occupants, pedestrians, bicyclists, and each item of damaged property. They do not stand in the same coverage position. |
| 2 | What kind of claim is it? | Human death or bodily injury goes to bodily-injury and wrongful-death analysis. Vehicle loss, bicycles, pets, electronics, and gear go to property-damage analysis unless separate first-party coverage applies. |
| 3 | What is the at-fault stack? | Identify personal auto, umbrella, permissive-use, employer, rideshare, commercial, governmental, or other layers before assuming the case is only minimum-limits. |
| 4 | Does a family-member exclusion change the result? | Montana expressly allows a named family-member exclusion, so passengers inside the at-fault household may have materially different access to liability coverage. |
| 5 | What does the victim household carry? | Read the declarations page for UM, any optional underinsured protection, collision, comprehensive, medical-payments coverage if any, and any umbrella or excess layer. |
| 6 | How is fault allocated? | Montana compares claimant negligence to the negligence of the person or combined negligence of all persons against whom recovery is sought and reduces damages proportionately if recovery remains available. |
| 7 | Is wrongful death involved? | Montana's wrongful-death action is brought by the personal representative of the decedent's estate, and damages are whatever is just under the circumstances. |
Scenario 1: multi-fatality minimum-limits matrix
Hypothetical catastrophe: a drunk driver, traveling with a spouse, infant child, and family dog, crashes into another passenger car carrying two adults, one child, and that family's bicycle rack and gear. All humans are killed. These tables are educational illustrations, not litigation predictions.
| Claimant group | Claim type | Primary coverage to examine | Main threshold issue | Citizen takeaway |
|---|---|---|---|---|
| At-fault driver | Own bodily injury or death | Not a third-party liability claim against the driver's own liability policy | Liability insurance is not first-party death coverage for the at-fault driver. | Look to life insurance, health coverage, medical-payments coverage if purchased, or estate planning—not liability. |
| At-fault driver's spouse | Wrongful death or bodily injury claim against driver or estate | Possible liability claim inside the bodily-injury coverage | A named family-member exclusion may remove or sharply limit the spouse's access to liability coverage. | Household passengers do not necessarily occupy the same coverage position as strangers in the other vehicle. |
| At-fault driver's child | Wrongful death or bodily injury claim against driver or estate | Same bodily-injury coverage issue | A named family-member exclusion can change the result even before the aggregate-limit question is reached. | Family-passenger exposure in Montana can be radically different from stranger-claimant exposure. |
| Other car: adult 1 | Wrongful death | Classic third-party bodily-injury or wrongful-death claim | Competes with every other covered human claimant in the 50k accident aggregate. | The per-accident aggregate can matter more than the 25k per-person figure. |
| Other car: adult 2 | Wrongful death | Same bodily-injury coverage | Same aggregate competition | Clear fault still leaves a very small shared coverage. |
| Other car: child | Wrongful death | Same bodily-injury coverage | Same aggregate competition | No separate child lane exists inside liability coverage. |
Property damage, bicycles, pets, and gear
| Item or loss | Usual coverage lane | What changes the analysis |
|---|---|---|
| Other family's vehicle | 20k property-damage coverage | Collision coverage on the victim side may pay first, but the PD limit still matters for reimbursement and total-loss pressure. |
| At-fault vehicle | Usually not a third-party property-damage claim against the at-fault driver's own liability policy | Look to collision or other first-party property coverages, not liability. |
| Bicycles, racks, helmets, child seats, electronics, luggage | 20k property-damage coverage | These items compete with the vehicle loss unless other first-party property coverage exists. |
| Pets | Property and economic-damage analysis, not wrongful-death analysis | The page should treat pets as property-damage items unless some other policy language changes the first-party side. |
Montana UM and underinsured issues
Montana clearly requires uninsured motorist bodily-injury coverage unless the named insured rejects it in writing. But Montana's underinsured questions are more policy-driven than in states that write a broad UIM default into the statute. That means a serious-crash evaluation in Montana often begins with the declarations page and then moves quickly to the policy form itself.
In practice, that creates two different Montana stories. If the at-fault driver is completely uninsured, the victim household's retained UM may be central. If the at-fault driver is only underinsured, the answer depends much more on the actual policy wording the injured household bought or rejected.
| Your own coverage position | What happens after a severe crash | Citizen takeaway |
|---|---|---|
| UM kept | If the at-fault driver is uninsured, UM may become the main bodily-injury recovery source. | Montana's default UM structure matters only if the household did not reject it. |
| UM rejected | The household may have no statutory uninsured-driver backstop through its own auto policy. | A rejection decision can radically alter recovery after a hit-and-run or no-insurance crash. |
| Optional underinsured protection purchased | The underinsured analysis becomes policy-specific. | The declarations page number alone is not enough; the actual policy form matters. |
| No optional underinsured protection | The household may discover there is no meaningful contractual backstop beyond UM. | Citizens often assume UM and UIM travel together when they do not. |
| High liability but weak or missing underinsured protection | The policy may protect others far better than it protects the insured household against a low-limit driver. | Read the declarations page and policy wording together, not separately. |
Pedestrians and bicyclists
| Victim type | Human injury or death coverage | Property coverage | What changes the analysis |
|---|---|---|---|
| Pedestrian adult | Third-party bodily-injury or wrongful-death claim | Clothing, carried items, devices | Competes with all other human BI claimants in the same accident aggregate. |
| Pedestrian child | Third-party bodily-injury or wrongful-death claim | Stroller or carried items | No separate child coverage category exists. |
| Bicyclist adult | Third-party bodily-injury or wrongful-death claim | Bicycle, helmet, electronics, rack, or cargo | The rider's bodily injury is a BI claim; the bicycle and gear are property-damage claims. |
| Bicyclist child | Third-party bodily-injury or wrongful-death claim | Bicycle and gear | The bodily-injury and property claims still sit in different coverage lanes. |
| Pedestrian or bicyclist with own UM or optional underinsured protection | Possible first-party backstop after the liability analysis | No automatic cure for ordinary property loss | The victim must know both the at-fault stack and the victim household's own declarations page. |
Higher tiers, umbrella, work use, TNC, and government claims
| Scenario | What changes | Why the calculation changes |
|---|---|---|
| Higher personal-auto tier (50/100/50, 100/300/100) | Larger bodily-injury and property-damage coverages | A severe crash may still overwhelm the policy, but the collapse is less severe than at 25/50/20. |
| High personal-auto limits plus umbrella | Excess liability may sit above the primary auto policy | If umbrella exists, settlement posture, release strategy, and first-party gap analysis may change substantially. |
| Driver on the job | Employer auto, commercial-use, or fleet questions may arise | The case may shift from a household policy to an employer or commercial stack. |
| TNC driver logged in but waiting | Montana requires at least 50/100/25 during the waiting period | The waiting-period rideshare case already differs from an ordinary household policy. |
| TNC driver on a prearranged ride | Montana requires at least 1,000,000 in primary liability while engaged in the ride | The claim may be radically different from an ordinary 25/50/20 crash. |
| Government vehicle or public employee | Montana Tort Claims Act rules, public-entity procedures, or immunity questions may apply | The claim can look very different from an ordinary household negligence case. |
Why disclosure still matters in Montana
Montana does not give claimants a simple Colorado-style presuit disclosure statute with a thirty-day deadline and daily penalties. Your earlier presuit-disclosure materials classify Montana as a limited or conditional disclosure state rather than a clean mandatory-disclosure state. That means claimants may still be pushed to negotiate, sign releases, or file suit without knowing whether the real case is minimum-limits, higher-tier, family-member-exclusion-limited, rideshare, employer, governmental, or umbrella.
Disclosure matters even more in Montana because the citizen may need to identify not only the liability limits but also any family-member exclusion, any retained UM, any optional underinsured protection, and any TNC, employer, or government layer before deciding whether to settle, release, or litigate.
Authorities and links
- 61-6-103, MCA Montana proof-of-financial-responsibility minimum amounts, including 25/50/20.
- 61-6-301, MCA Required motor vehicle insurance and express family-member exclusion language.
- 33-23-201, MCA Montana uninsured motorist coverage statute.
- 27-1-702, MCA Montana comparative negligence.
- 27-1-501, MCA Montana wrongful-death action.
- 69-12-343, MCA Montana transportation network carrier insurance requirements.
- Montana DOJ / MVD vehicle insurance page Consumer-facing confirmation of Montana's minimum liability requirements.
Caution. These matrices are educational illustrations. Actual claim value, family-member exclusion language, UM rejection validity, optional underinsured protection, wrongful-death beneficiary issues, rideshare status, and coverage-layer interaction turn on policy language, claimant status, and proof.