Uninsured Motorist Coverage Rules in Montana

If an uninsured driver hits you in Montana, the coverage that pays for your injuries is often your own policy, not theirs. Montana law makes sure that coverage is at least put in front of you, but the rules around it are narrower than most drivers assume, and a single old signature can leave you without it.

Here is what Montana actually requires, the numbers attached to it, and the deadlines that decide whether you collect.

What your insurer has to offer you

Every auto liability policy issued for a vehicle registered and principally garaged in Montana has to include uninsured motorist (UM) coverage, in the same bodily-injury limits the state sets for liability insurance, unless the named insured rejects that coverage in writing.¹ The Montana Commissioner of Securities and Insurance states the rule for drivers plainly: "Unless you sign a form stating you do not want Uninsured Motorist coverage, your agent is required by law to provide it to you."²

That coverage runs to more than just the policyholder. The statute protects "persons insured under the policy who are legally entitled to recover damages" from an uninsured driver, which typically means you, your household family members, and passengers in your car.¹

The rejection is sticky. Under Mont. Code Ann. 33-23-201, once you have turned UM coverage down in writing, your insurer does not have to add it back to a renewal policy unless you request it in writing.¹ A rejection you signed years ago can follow you quietly through renewal after renewal. If you don't know whether you carry UM coverage right now, check before you ever need it.

Montana defines an uninsured motor vehicle as "a land motor vehicle, the ownership, the maintenance, or the use of which is not insured or bonded for bodily injury liability at the time of the accident."¹ So UM coverage is what responds when the at-fault driver had no bodily-injury liability insurance at all. Hit-and-run crashes, where the other driver is never identified, are usually handled as UM claims too, though how that works depends on your specific policy language.

Underinsured coverage is separate, and optional

Here is the gap that catches people off guard. Montana requires insurers to offer uninsured motorist coverage. It does not require them to offer underinsured motorist (UIM) coverage. Section 33-23-201 mandates UM only, and nothing else in Montana's motor vehicle liability statutes creates a UIM requirement.¹³ UIM is the coverage that pays when the at-fault driver had insurance, just not enough to cover what they did to you. In Montana it is a purely optional add-on.

That distinction has teeth because Montana's minimum liability limits are low: $25,000 per person and $50,000 per accident for bodily injury, plus $20,000 for property damage.⁴ A driver carrying nothing more than the minimum can put you in the hospital for months and still leave you far short of covered. UM won't help there, because that driver is insured, just barely. Only UIM fills that gap, and only if you bought it.

Limits and the stacking question

When you do carry UM coverage, it matches the state's minimum bodily-injury limits, $25,000 per person and $50,000 per accident, unless you paid for higher limits.¹⁴

Whether you can stack those limits, meaning add together the coverage on more than one vehicle or policy, is governed by Mont. Code Ann. 33-23-203. The starting point in that statute is that your available limits are fixed "regardless of the number of motor vehicles insured under the policy, the number of policies issued by the same company covering the insured, or the number of separate premiums paid."⁵ There is a condition on it, though. An insurer can keep those limits from stacking only if the premiums it charged "actuarially reflect the limiting of coverage separately to the vehicles covered by the policy and the premium rates have been filed with the commissioner."⁵ If you paid a separate UM premium on each of three cars but your insurer never filed rates that properly reflect an anti-stacking limit, you may have a real argument that the coverage stacks. It is fact-specific, and it is worth having a lawyer read your declarations page against the policy.

When your own insurer wants its money back

Say your UM coverage pays your medical bills, and later there is a recovery from somewhere else. Montana law lets a policy carry "reasonable limitations, exclusions, reductions of coverage, or subrogation clauses that are designed to prevent duplicate payments."⁵ So your insurer can, in the right situation, ask to be paid back out of that later recovery.

Montana is also one of the strictest states in the country on the "made whole" rule. The Montana Supreme Court has held for decades that an insurer cannot collect on a subrogation claim until you have been fully compensated for your loss, including the costs and attorney fees you spent getting there. If you have not been made whole, the insurer waits. That rule often decides who keeps the larger share of a recovery, so read any reimbursement demand from your own carrier carefully rather than just paying it.

The deadlines that actually apply

Two different clocks run after a crash with an uninsured or underinsured driver, and mixing them up is a common way to lose a claim.

The first is the deadline to sue the at-fault driver. In Montana you generally have three years from the date of the crash to file a personal injury lawsuit.⁶ Miss it and the claim is gone, no matter how badly you were hurt.

The second clock is for a claim against your own insurer under your UM or UIM coverage. That is a first-party contract claim, so it runs on Montana's written-contract limitation rather than the three-year tort clock. Montana sets that period at six years,⁷ not the eight years some older sources still cite. Don't treat six years as breathing room. Your policy almost certainly has its own notice and proof-of-loss deadlines that come due long before that, and waiting invites a fight over whether your claim is even timely. Damage to your vehicle runs on a third clock, two years.⁸

After a crash with an uninsured driver

Report the crash and get the official report, which you will need for any UM claim; you can request yours through Montana's crash-report system. Notify your own insurer promptly and in writing, and open the UM or UIM claim even if you also plan to pursue the other driver. If your car was damaged and later appraises or sells for less because of its accident history, that is a separate diminished-value claim. And because these disputes turn on policy wording and Montana's stacking and made-whole rules, it is usually worth having a Montana attorney review the policy before you accept any offer.

The coverage is often already sitting on your policy, or it was offered once and signed away. Knowing which is true for you, before a crash rather than after, is what turns Montana's UM rules from fine print into money that actually shows up.

This article is general information, not legal advice.

Sources

Montana Code Annotated 33-23-201, Motor vehicle liability policies to include uninsured motorist coverage; rejection by insured. https://mca.legmt.gov/bills/mca/title_0330/chapter_0230/part_0020/section_0010/0330-0230-0020-0010.html
Montana Commissioner of Securities and Insurance (Office of the Montana State Auditor), Auto insurance. https://csimt.gov/your-insurance/auto/
Montana Code Annotated, Title 33, chapter 23, part 2 (Motor Vehicle Liability), section index. https://mca.legmt.gov/bills/mca/title_0330/chapter_0230/part_0020/sections_index.html
Montana Code Annotated 61-6-103, mandatory minimum motor vehicle liability limits. https://mca.legmt.gov/bills/mca/title_0610/chapter_0060/part_0010/section_0030/0610-0060-0010-0030.html
Montana Code Annotated 33-23-203, Limitation of liability under motor vehicle liability policy. https://mca.legmt.gov/bills/mca/title_0330/chapter_0230/part_0020/section_0030/0330-0230-0020-0030.html
Montana Code Annotated 27-2-204, tort actions; three-year personal injury limitation. https://mca.legmt.gov/bills/mca/title_0270/chapter_0020/part_0020/section_0040/0270-0020-0020-0040.html
Montana Code Annotated 27-2-202, contract actions; six-year written-contract limitation. https://mca.legmt.gov/bills/mca/title_0270/chapter_0020/part_0020/section_0020/0270-0020-0020-0020.html
Montana Code Annotated 27-2-207, actions for injury to property; two-year limitation. https://mca.legmt.gov/bills/mca/title_0270/chapter_0020/part_0020/section_0070/0270-0020-0020-0070.html