Ignition Interlock Cost in Tennessee (2026)
Complete guide to ignition interlock device (IID) costs in Tennessee — installation, monthly fees, and how to save money.
Ignition Interlock Requirements in Tennessee
Required for all offenses. An ignition interlock device (IID) is a breathalyzer installed in your vehicle that prevents the engine from starting if it detects alcohol on your breath. In Tennessee, IID requirements are part of the DUI sentencing framework and are enforced through the court and DMV systems.
The IID requirement in Tennessee serves two purposes: it allows DUI offenders to continue driving legally while ensuring public safety, and it provides courts with data about the offender's compliance. Most Tennessee courts view IID compliance positively when considering sentence modifications or early termination of probation.
Cost Breakdown
One-time fee to install the device in your vehicle. Some providers offer free installation with a lease agreement.
Covers the device lease, data transmission to the monitoring authority, and regular calibration visits.
Required every 30-60 days. Many providers include this in the monthly lease. The device must be recalibrated regularly to ensure accuracy.
One-time fee to remove the device at the end of your IID requirement period.
Fee charged if you trigger a lockout or violation, such as failing a test or missing a calibration appointment.
Tennessee may charge an administrative fee to add or remove the IID restriction on your license.
Total Estimated IID Cost in Tennessee
Comparing IID Providers in Tennessee
You can typically choose from several state-approved IID providers in Tennessee. The major national providers — Intoxalock, Smart Start, LifeSafer, and Draeger — all operate across Tennessee. Costs vary by provider, so it is worth comparing options. Consider installation cost, monthly fees, calibration frequency, customer service, and the number of service locations near you in Nashville, Memphis, Knoxville and other Tennessee cities.
Intoxalock
Smart Start
LifeSafer
Draeger
How to Save Money on IID in Tennessee
Several strategies can reduce your IID costs: compare multiple providers for the best rates, ask about financial hardship programs (many providers and states offer reduced rates for low-income individuals), avoid violations that trigger extra fees, keep all calibration appointments on schedule, and consider providers that offer free installation with a lease agreement. Some Tennessee courts also allow early removal of the IID for good compliance.
Compare All IID Providers
See our full comparison guide with pricing, reviews, and locations.
Full IID Guide →Related Resources
- 📋 Full Tennessee DUI Laws Guide
- 🚨 First Offense Penalties in Tennessee
- 💰 DUI Cost in Tennessee
- 🍺 BAC Limit in Tennessee
- 🚫 License Suspension in Tennessee
- ⚖️ Find a DUI Attorney
- 🔧 Ignition Interlock Full Guide
- 🔑 License Reinstatement
- 💰 DUI Cost Calculator
Official Sources
DUIFinders.com is not a law firm and does not provide legal advice. Information is for general purposes only.
Frequently Asked Questions
How much does an ignition interlock device cost in Tennessee?
In Tennessee, an ignition interlock device typically costs $70-$150 for installation and $60-$90 per month for leasing and calibration. Total cost over a typical program period is $1,000-$3,000.
Is an ignition interlock required in Tennessee?
Required for all offenses
How long do I need an ignition interlock in Tennessee?
The IID requirement period in Tennessee depends on your offense. First offenders typically need it for 6-12 months. Repeat offenders may need it for 1-3 years or longer.
What happens if I fail an interlock test in Tennessee?
Failing an IID test (registering alcohol on your breath) in Tennessee triggers a lockout — your vehicle will not start. Repeated failures are reported to the court and can extend your IID requirement or result in additional penalties.
Can I choose my ignition interlock provider in Tennessee?
In most cases, yes. Tennessee has a list of state-approved IID providers. Major providers operating in Tennessee include Intoxalock, Smart Start, LifeSafer, and Draeger.