Montana Ignition Interlock Cost Calculator 2026
Montana does not require an ignition interlock after a first DUI conviction, so there is no first-offense device cost to add up. Change the offense level below to price a second or third offense.
Your Montana DUI estimate will appear here
Answer the questions and press the button. You will get a low, typical and high figure, with each cost listed on its own line.
- Uses this state's own fines, suspension and interlock rules
- Market costs such as attorney fees are labelled as estimates
- Free, and nothing to sign up for
Montana DUI FAQ
How much does a DUI cost in Montana?
Attorney fees for a first-offense DUI in Montana typically run $2,500 to $10,000 on our estimates, and the fine is $600 to $1,000 before court costs. Adding insurance, interlock, education, reinstatement and lost time from work, our calculator puts a typical first offense at about $20,577 (range $9,831 to $32,910) with its default answers; the median of our 50 state estimates is $17,615.
How long is your license suspended for a first DUI in Montana?
A first-offense DUI conviction in Montana carries a license suspension of 180 days. A hardship or restricted license may be available during this period.
Is an ignition interlock device required in Montana for a first DUI?
Our Montana data shows no interlock requirement for a first-offense DUI.
How long is SR-22 insurance required after a DUI in Montana?
Montana requires SR-22 high-risk insurance filing for 3 years following a DUI conviction.
Can a DUI be expunged in Montana?
Montana allows DUI expungement under certain conditions, typically after a waiting period of 5 years following completion of your sentence.
Montana DUI figures this calculator uses
- Ignition interlock, first offense
- None
- Ignition interlock, second offense
- 12 months
- Ignition interlock, third offense
- 12 months
- Required for every offense
- No
- Typical monthly lease and monitoring (estimate)
- $90
Statutory figures were checked against Montana law (primary source) and last verified May 2026. Typical ranges are market estimates, not law; see our methodology.
Worked example
With the calculator's default answers (offense number: First offense; number of vehicles you own: 1 vehicle):
Montana does not require an ignition interlock device after a first DUI conviction, so there is no device cost to estimate. A second DUI conviction carries a 12-month interlock requirement.
Change the answers in the calculator above to see your own estimate.
On our estimates, a typical first-offense DUI in Montana comes to about $20,577, the 19th highest of the 50 states. The median of our 50 state estimates is $17,615. These come from the total-cost calculator with its default answers, not from a national survey.
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Montana DUI Total Cost Calculator →Montana DUI Overview
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Montana Attorney Cost →Montana Total Cost →Montana SR-22 Insurance →Montana Suspension Timeline →Related Guide
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