Ignition Interlock Device (IID) in Montana
Montana uses the term "DUI" for impaired driving offenses. IID requirement: required for high bac or repeat offenses. First offense duration: 6 months (only if BAC 0.16%+ and court-ordered). Monthly cost: $65-$100.
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Quick Answer
Montana requires IID for second and subsequent DUI offenses. First-offense DUI with BAC of 0.16%+ may also trigger IID requirements at the court's discretion.
IID Duration by Offense
| Offense | IID Duration |
|---|---|
| 1st Offense | 6 months (only if BAC 0.16%+ and court-ordered) |
| 2nd Offense | 1 year |
| 3rd Offense | 1 year |
| 4th+ Offense | Permanent (as condition of probation) |
BAC threshold: 0.16% BAC for first offense (discretionary); all repeat offenses
IID Cost Breakdown in Montana
| Item | Cost | Notes |
|---|---|---|
| Installation | $75-$150 | One-time fee. Takes about 1 hour. |
| Monthly Lease + Monitoring | $65-$100/mo | Includes device lease and monitoring. |
| Calibration | $25-$75 | Every 60 days. |
| Removal | $50-$100 | One-time fee when IID period ends. |
| Estimated Total (6 months) | $515-$850 | Install + 6 months lease + removal. |
| Estimated Total (12 months) | $905-$1,450 | Install + 12 months lease + removal. |
One-time
Lease + monitoring
Every 60 days
One-time
All-in estimate
All-in estimate
Approved IID Providers in Montana
Contact providers directly for current pricing and service center locations in Montana. Compare at least 2-3 providers before choosing — prices and service quality vary.
Restricted License with IID
Montana allows a probationary license with IID for essential driving.
Tampering / Circumvention Penalties
Tampering with an IID in Montana carries additional penalties including fines and extension of the IID requirement.
Early Removal
Montana does not typically allow early removal.
Montana-Specific Notes
Montana is less strict than many states for first offenders — IID is generally only required for repeat offenders. However, high BAC first offenders may still face IID at the court's discretion.
Frequently Asked Questions
Is an IID required for a first DUI in Montana?
How long do I need an IID in Montana?
How much does an IID cost in Montana?
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