Montana is an at-fault (tort) auto insurance state.
In an at-fault (tort) state, the driver who causes a crash — through their liability insurance — is responsible for the other party's injuries and damage, and you retain the full right to sue the at-fault driver.
Montana at a glance
Fault system
At-fault (tort)
PIP required?
Not mandated
UM/UIM in minimum?
Not required
Rural; relatively low premiums.
Montana Fault System — FAQ
Is Montana a no-fault state?
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Montana is an at-fault (tort) auto insurance state. In an at-fault (tort) state, the driver who causes a crash — through their liability insurance — is responsible for the other party's injuries and damage, and you retain the full right to sue the at-fault driver. Rural; relatively low premiums.
Does Montana require PIP or uninsured-motorist coverage?
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Montana does not mandate PIP in its minimum auto policy, though many insurers offer it (and MedPay) as an add-on. Uninsured/underinsured motorist coverage is not part of the mandatory minimum, but it is worth adding given uninsured-driver risk.
Why does it matter whether Montana is no-fault or at-fault?
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It changes who pays and whether you can sue. In a no-fault state your own PIP pays your medical costs first and lawsuits are limited to serious injuries; in an at-fault state the at-fault driver's liability insurance pays and you keep the full right to sue. This affects which coverages you should carry. This is general information, not legal advice — confirm specifics with the Montana Department of Insurance or a licensed attorney.
Related guides and tools
Sarah Mitchell
Editorial Lead, Property & Casualty
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed July 2026
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