Car Insurance After a DUI in Montana

After a DUI, your insurer can raise your rate at renewal, cancel you mid-term if your license is suspended, or decline to renew. Montana law limits each of those steps, and it stops a personal auto insurer from counting a DUI once the information is three years old. What the law does not do is set the size of the increase. This page explains the rules that exist. It is part of our Montana DUI Guide, and it goes deeper than the insurance section of what a DUI costs.

What an Insurer Can and Cannot Do

The 3-Year Rating Limit

Two statutes set the limit. The rating law says special risk classifications for private passenger auto policies "may not be established based on adverse information contained in an insured individual's driving record that is 3 years old or older" (MCA § 33-16-201(4)(b)). The unfair trade practices law adds that an insurer may not refuse to insure, refuse to continue to insure, charge higher rates, or limit coverage "based solely on" adverse claims-history and driving-record information that is 3 years old or older (MCA § 33-18-210(11)(a)).

Two cautions about reading those sections:

• They do not say when the three years start. Neither statute says whether the clock runs from the arrest, the conviction, or the date the entry reached your driving record. Ask your insurer which date it uses.
• "Based solely on" is a real limit on the protection. An insurer that has other current reasons is not barred from acting on them.

The conviction itself stays on your record much longer than three years. The insurance limit is about what a company may rate on, not about what the record shows. You can see what an insurer will see by ordering your own driving record.

Cancellation in the Middle of a Policy

A notice of cancellation of a motor vehicle liability policy is effective only if it rests on one of two reasons: nonpayment of premium, or the fact that the driver's license of the named insured, or of another operator who lives in the household or customarily drives an insured vehicle, "has been under suspension or revocation during the policy period" (MCA § 33-23-211(1)). For a renewal policy, the look-back also covers the 180 days before the renewal took effect.

That matters in a DUI case in three ways:

• The trigger is the suspension, not the arrest. A DUI conviction leads to a suspension (MCA § 61-5-208). So does a test refusal, even without a conviction. See DUI license suspension.
• It reaches the household. A spouse's or adult child's suspension can be the ground for cancelling a policy in your name.
• You get notice. The insurer must mail or deliver written notice at least 45 days before the cancellation takes effect, and must give the reason or tell you that you can request it in writing (MCA § 33-23-212).

The limits on cancellation do not apply to a new policy that has been in effect less than 60 days (MCA § 33-23-211(2)).

Non-Renewal at the End of the Term

The cancellation statute says in so many words that it "does not apply to nonrenewal" (MCA § 33-23-211(4)). An insurer that wants to stop covering you at the end of the term has to mail or deliver at least 45 days' advance notice. The notice must tell you that, if you ask in writing within one month after the policy ends, the company will give you its reasons in writing within 15 days (MCA § 33-23-214(1)). One exception: for a policy with a term shorter than six months, a non-renewal is effective only if it is based on one of the two cancellation grounds (MCA § 33-23-214(6)).

The Commissioner of Securities and Insurance, in its auto insurance guidance for consumers, lists a "bad driving record (speeding, DUI, etc.)" among the factors companies review when they decide whether to non-renew.

If No Company Will Insure You

Montana requires every owner of a registered vehicle to carry liability insurance continuously, and it is unlawful to drive without it (MCA § 61-6-301). Losing a policy does not excuse the requirement. Three things are worth knowing:

• The assigned risk plan. The insurance commissioner must approve a plan that apportions among insurers the applicants who are "in good faith entitled to but are unable to procure" auto liability policies through ordinary methods, and every company writing those policies in Montana must participate (MCA § 61-6-144).
• Named-driver exclusions. Montana law does not prohibit excluding a named family member from a policy (MCA § 61-6-301(1)(b)). Some households keep coverage by excluding the driver with the DUI, which means that person has no coverage under that policy at all.
• The regulator. The Commissioner of Securities and Insurance oversees auto insurers in Montana and invites consumers to call with questions or concerns about a policy.

The SR-22 Question

Many insurance websites state that every Montana DUI requires an SR-22 for three years. The statute ties the certificate of insurance to a license revocation (MCA § 61-6-131), and a misdemeanor DUI produces a suspension. Our page on SR-22 insurance works through it, and license reinstatement steps covers what the Motor Vehicle Division asks for.

What Actually Changes the Insurance Outcome

Every rule on this page is tied to one of two events: a conviction on your driving record, or a suspension of your license. An arrest that ends in an acquittal or dismissal produces no conviction to rate on. A refusal suspension that is successfully challenged in district court is no longer a suspension. That is why the insurance question is usually answered in the criminal case, and why it is worth raising with your defense attorney early.

This page explains Montana law in general as of the 2025 Montana Code Annotated. Premiums and underwriting rules are set by each insurer. It is not legal advice about your specific case or your policy.