What Montana Law Requires for Every Vehicle
Montana law requires every registered vehicle to carry liability insurance with minimum limits of $25,000 per person for bodily injury, $50,000 per accident for bodily injury, and $20,000 for property damage. You must provide proof of insurance when you register a vehicle with the Montana Department of Justice Motor Vehicle Division, and you must maintain continuous coverage as long as the vehicle remains registered. The state does not mandate personal injury protection or uninsured motorist coverage—those are optional.
If you're insuring two or more vehicles in Montana, each vehicle on your policy must meet these minimums. Most carriers structure multi-car policies so the liability limits apply per vehicle, not across the household. That means if you carry the state minimum and one vehicle causes an accident that exceeds $25,000 in bodily injury to a single person, your policy pays only to the limit—you're personally liable for the rest.
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Get Your Free QuoteMontana Liability Minimums
$25,000 / $50,000 / $20,000
Montana Revised Code requires $25,000 per person for bodily injury, $50,000 per accident for bodily injury, and $20,000 for property damage. These are the lowest limits you can carry and remain legal.
Montana Revised Code (MCA 61-6-103)
The Coverage Gap Most Multi-Car Households Miss
Montana does not require uninsured motorist coverage or underinsured motorist coverage. That means if an uninsured driver hits one of your vehicles—and 7.2% of Montana motorists are uninsured—you have no coverage for your own injuries or vehicle damage unless you added uninsured motorist coverage voluntarily. The state minimum protects the other driver when you cause an accident; it does nothing when someone without insurance hits you.
Most households with multiple vehicles assume the state minimum covers them in every scenario. It doesn't. If you carry only the required liability and an uninsured driver totals your car, your liability policy pays nothing toward your vehicle. If you're injured in that crash, your liability policy pays nothing toward your medical bills. You're left filing a lawsuit against someone who likely has no assets, or paying out of pocket.
Uninsured motorist coverage is optional in Montana, but it's the only protection you have when the at-fault driver carries no insurance. If you're managing coverage for two or more vehicles, adding uninsured motorist coverage to your policy costs less than replacing one vehicle or covering one hospital bill after an uninsured-driver crash.
Montana does not require uninsured motorist coverage. If an uninsured driver hits your vehicle, your liability-only policy pays nothing toward your damage or injuries.
Proof of Insurance and Registration
When you register a vehicle in Montana, the Motor Vehicle Division verifies your insurance electronically through the Montana Insurance Verification System. Your carrier reports your policy to the state automatically. If your coverage lapses, the state receives notice and may suspend your registration. You must also carry proof of insurance in the vehicle at all times—either a paper card from your carrier or an electronic proof document on your phone. Law enforcement can request proof during any traffic stop.
If you're adding a second or third vehicle to your household, notify your carrier before you register the new vehicle with the Motor Vehicle Division. Most carriers provide immediate proof of insurance for a newly added vehicle, which you'll need to complete registration. If you register the vehicle first and add it to your policy later, the state's verification system may flag a gap between registration and coverage, triggering a suspension notice even if you added coverage the same day.
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Full Coverage vs Minimum Coverage for Multiple Vehicles
Full coverage typically means liability plus collision and comprehensive on every vehicle. Collision pays for damage to your vehicle when you cause an accident or hit an object; comprehensive pays for theft, vandalism, weather damage, and animal strikes. Neither is required by Montana law, but both are required by your lender if you finance or lease a vehicle. If you own your vehicles outright, you decide whether to carry collision and comprehensive based on each vehicle's value and your ability to replace it out of pocket.
For households with multiple vehicles, the decision often splits by vehicle. A newer financed car requires full coverage. Most carriers let you carry different coverage levels on different vehicles within the same policy, so you can carry full coverage on the financed vehicle and liability-only on the older one.
Comprehensive coverage makes sense even on older vehicles in Montana because of the state's animal-strike risk. Montana recorded 1.52 traffic fatalities per 100 million vehicle miles traveled in 2023, and a significant portion of Montana crashes involve animals. Comprehensive covers animal strikes; liability does not. If a deer totals your vehicle and you carry only liability, you pay to replace the vehicle yourself.
Montana Uninsured Motorist Rate
7.2%
7.2% of Montana motorists drive without insurance. That's roughly 1 in 14 drivers. Uninsured motorist coverage is the only protection your household has when one of those drivers causes a crash.
Insurance Information Institute, 2023
How Adding Vehicles Changes Your Policy
When you add a vehicle to an existing Montana auto policy, your carrier re-rates the entire policy. The premium increase is not simply the cost of insuring the new vehicle—it's the cost of insuring all vehicles on the policy under the new household risk profile. Most carriers apply a multi-car discount when you insure two or more vehicles on the same policy, but the discount applies to the total premium, not per vehicle. The net result: adding a second vehicle costs less than buying a separate policy for it, but more than you'd expect if you assumed a flat per-vehicle rate.
The multi-car discount requires every vehicle to sit on the same policy and typically requires all vehicles to be garaged at the same address. If a household member moves to a different address and takes their vehicle with them, that vehicle may no longer qualify for the same-policy discount. Some carriers require you to remove the vehicle and start a separate policy; others allow it to remain on the household policy but re-rate the policy to reflect the new garaging location.
Compare Carriers That Write Montana Multi-Car Policies
Fifteen carriers write auto insurance in Montana with confirmed multi-vehicle capability: Allstate, Amica, Bristol West, CSAA, Farmers, Geico, Hartford, Liberty Mutual, National General, Nationwide, Progressive, Root, State Farm, The General, Travelers, and USAA. Not every carrier offers the same multi-car discount structure, and not every carrier writes coverage for every driver profile. If one vehicle in your household has a driver with a recent violation, some carriers will decline to write the policy or price it as high-risk, while others specialize in non-standard coverage and offer competitive rates for that exact profile.
Request quotes from at least three carriers that write Montana policies. Provide accurate information for every vehicle and every driver in your household—the quote you receive is only as accurate as the information you provide. Compare not just the total premium but the coverage limits, the deductibles, and whether uninsured motorist coverage is included. The lowest premium with the state minimum liability and no uninsured motorist coverage is not the best deal if it leaves your household exposed to an uninsured-driver crash.