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 scope: 6 months (only if BAC 0.16%+ and court-ordered). Confirm your actual notice and license status.

Last updated: 2026-09-07

Required for high BAC or repeat offenses

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

Confirm the device, provider and written quote

Check the responsible authority’s current approval information for the particular device and installer. Request the billing unit, included services, actual paid visit schedule, taxes, fees and removal terms in writing. Confirm financial assistance separately.

Add your own quoted charges in the IID worksheet. Unknown charges stay unknown; no local price or appointment count is assumed.

Restricted License with IID

Available

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?

Generally no. Montana does not mandate IID for standard first-offense DUI. However, if your BAC was 0.16% or higher, the court may order IID.

How long do I need an IID in Montana?

Second and third offense: 1 year. Fourth or more: may be permanent as a condition of probation.

How much does an IID cost in Montana?

Get a written quote for your vehicle and program. Confirm the billing period, included service, separately paid visits, taxes, state/program fees and removal charges. Verify any financial assistance before assuming a discount. A generic state price range is not your quote.

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Disclaimer: This is informational only, not legal advice. IID requirements, costs, and approved providers change frequently. Verify current requirements with the Montana DMV, your IID provider, or a qualified DUI attorney in Montana.

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Sources

NHTSA: interlock device and program background. This national reference does not verify every state rule above. Confirm the applicable law and current instructions with the authority named on your order or licensing notice.