Ignition Interlock Device (IID) in Tennessee

Tennessee uses the term "DUI" for impaired driving offenses. IID requirement: required for all dui offenses. First offense scope: 1 year. Confirm your actual notice and license status.

Last updated: 2026-09-07

Required for all DUI offenses

Quick Answer

Tennessee requires IID for all DUI convictions, including first offenses. The device is mandatory as a condition of receiving a restricted license.

IID Duration by Offense

Offense	IID Duration
1st Offense	1 year
2nd Offense	2 years
3rd Offense	3 years
4th+ Offense	5 years

BAC threshold: Any DUI conviction (no BAC threshold — all offenders)

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

Tennessee issues a restricted license with IID for driving to work, school, medical appointments, and court-ordered programs.

Tampering / Circumvention Penalties

Tampering with an IID in Tennessee is a Class A misdemeanor carrying up to 11 months and 29 days in jail and fines up to $2,500.

Early Removal

Tennessee does not allow early removal.

Tennessee-Specific Notes

Tennessee requires IID for all DUI offenders and has relatively standard durations. The state requires monthly calibration, which is more frequent than some states.

Frequently Asked Questions

Is an IID required for a first DUI in Tennessee?

Yes. Tennessee requires IID for all DUI convictions, including first offenses, for 1 year.

How long do I need an IID in Tennessee?

First offense: 1 year. Second: 2 years. Third: 3 years. Fourth or more: 5 years.

How much does an IID cost in Tennessee?

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 Tennessee DMV, your IID provider, or a qualified DUI attorney in Tennessee.

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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.