Tennessee DUI Ignition Interlock Requirements (2026): Costs, EMIF Fund & Approved Providers
Tennessee requires an ignition interlock for virtually every DUI driver who wants a restricted license — BAC 0.08%+ makes it mandatory for restricted driving. The 120-day violation-free window must be clean to end the requirement, and any violation restarts that entire window. The state’s Electronic Monitoring Indigency Fund (EMIF) can cover up to $170/month for qualifying low-income drivers. Here’s how the program works.
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Tennessee DUI interlock requirements at a glance
| Offense term | DUI (Driving Under the Influence) — TCA 55-10-401 |
| All-offender? | Effectively yes for restricted licenses — BAC 0.08%+ mandates IID for any restricted license (TCA 55-10-409). Not an automatic condition of every conviction without a restricted license request. |
| Mandatory triggers | BAC 0.08%+ at time of offense; minor (under 18) in vehicle; crash involving injury; or prior implied-consent violation within 5 years (TCA 55-10-409) |
| Optional IID | Court may order IID in lieu of geographic driving restrictions for cases that don’t hit mandatory triggers |
| 1st offense — IID minimum | 365 days OR the full revocation period, whichever is longer; final 120 days must be violation-free (TCA 55-10-425) |
| 2nd offense — IID minimum | 730 days (2-year revocation period) with final 120 days violation-free |
| 3rd offense — IID minimum | 2,190 days (6-year revocation period) with final 120 days violation-free |
| 4th+ offense — IID minimum | 2,920 days (8-year revocation) with final 120 days violation-free |
| 120-day clean window | Final 120 days of the IID term must be completely violation-free. Any violation in this window adds 120 more days (repeatable). Violations earlier in the term restart the 120-day period. |
| Unauthorized removal | Restarts the entire IID term from the beginning — not just the 120-day window |
| Electronic Monitoring Indigency Fund (EMIF) | Court finding of indigency required; indigent driver pays minimum $30/month; fund pays up to $170/month (TCA 55-10-419). Note: EMIF’s interlock-specific side moved to OCJP (Oct 2023) after funding strain — confirm current status with TN OCJP. |
| TN Dept. of Safety fees | $12.50/year IID administrative fee; $65 restoration fee per offense; $50 financial-responsibility filing fee |
| SR-22 required? | Yes — for the length of the suspension/revocation period (tn.gov); the common “3-year” claim is not confirmed in TCA 55-12-126 for DUI cases |
| Who approves providers | TN Dept. of Safety & Homeland Security — tn.gov — Ignition Interlock |
| Governing law | TCA 55-10-409; 55-10-417; 55-10-425; 55-10-419; 55-12-126 |
The 120-day violation-free window — Tennessee’s exit gate
Tennessee’s removal standard (TCA 55-10-425) requires that the final 120 days of your IID term be completely violation-free before the provider can issue a compliance certificate and the Department of Safety can issue a removal form. Several important nuances:
- Violation in the final 120 days: 120 more days are added to your term. This is repeatable — another violation in that new 120-day window adds yet another 120 days.
- Violation earlier in the term: Restarts the 120-day window — you must complete 120 consecutive violation-free days after any earlier violation before counting toward removal eligibility.
- Unauthorized removal: Restarts the entire IID term from the beginning — not just the 120-day window. This is the most severe consequence in Tennessee’s program.
Unauthorized removal restarts your entire term from day one. Unlike most states where an unauthorized removal extends your term by a fixed period, Tennessee’s TCA 55-10-425 restarts the full IID term from the beginning. If you’re 11 months into a 12-month term and have the device removed without authorization, you start over from month one. Never remove the device without written authorization from the Department of Safety.
Electronic Monitoring Indigency Fund (EMIF)
Tennessee’s EMIF (TCA 55-10-419) provides cost relief for qualifying low-income DUI drivers ordered to install an IID. Key details:
- Eligibility: Court finding of indigency based on income and assets versus poverty guidelines
- Driver contribution: Minimum $30/month — not free, but subsidized
- Fund contribution: Up to $170/month (covering the bulk of standard monthly device costs)
EMIF’s IID component moved to OCJP in October 2023 — confirm current status. After funding strain, Tennessee moved the interlock-specific side of the EMIF to the Office of Criminal Justice Programs (OCJP) in October 2023. The program is active per tn.gov, but administration and enrollment procedures may have changed. Before relying on EMIF, confirm current availability and enrollment procedures with TN OCJP or the Department of Safety.
TN Dept. of Safety-approved providers
Three major national providers are on Tennessee’s approved list. Guardian, Dräger, and ALCOLOCK are not on the TN list.
| Provider | Monthly est. | Coverage | |
|---|---|---|---|
| Intoxalock | $60–100 | Statewide | 888-283-5899 |
| Smart Start | $70–100 | Statewide | 800-831-3299 |
| LifeSafer | $65–95 | Statewide | 800-634-3077 |
Confirm current TN approval at tn.gov before signing. Guardian, Dräger, and ALCOLOCK are not on the TN list. Monthly estimates are market ranges. If applying for EMIF, confirm current procedures with TN OCJP before contacting a provider.
What an interlock costs in Tennessee
| Installation (one time) | $70–150 |
| Monthly lease + monitoring | $60–100 (EMIF covers up to $170/mo; driver pays min $30/mo) |
| Removal | $50–75 |
| TN IID administrative fee | $12.50/year |
| TN restoration fee | $65 per offense |
| Financial responsibility filing fee | $50 |
Over a 365-day first-offense term: roughly $900–1,400 before state fees; potentially as low as $360+ for EMIF recipients (min $30/mo × 12 mo + installation). Estimate your exact cost →
How to get installed — 5 steps
- After your DUI conviction, apply to the TN Dept. of Safety for your restricted license. If your BAC was 0.08%+ or you hit another mandatory trigger, the IID is required as a condition of that restricted license.
- If you may qualify for EMIF (court finding of indigency), raise this with the court at sentencing or shortly after — the court finding is required. Then confirm current EMIF enrollment with TN OCJP.
- Contact a TN-approved provider, confirm current approval, and schedule installation. The restricted license and IID go together.
- Drive cleanly for your entire IID period, with extra care in the final 120 days. Any violation restarts the 120-day window; unauthorized removal restarts the entire term.
- After 120 consecutive violation-free days at the end of your term, the provider issues a compliance certificate. The Dept. of Safety issues a removal form. Do not remove the device without this paperwork.
120 clean days ends the requirement. Start clean and stay clean — call to book installation now.
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Tennessee requires SR-22 insurance for the length of your suspension/revocation period. The common “3 years” figure may not apply to your specific case. See Tennessee SR-22 costs and cheapest carriers →
Tennessee DUI interlock FAQ
Does every Tennessee DUI require an interlock?
Effectively yes if you want to drive during your revocation. An IID is mandatory for any restricted license when your BAC was 0.08%+, a minor was in the vehicle, there was a crash with injury, or you had a prior implied-consent violation within 5 years (TCA 55-10-409). Without a restricted license request, the IID is not an automatic condition of conviction. For most working drivers, the restricted license — and thus the IID — is essential.
How does the 120-day violation-free window work in Tennessee?
Under TCA 55-10-425, the final 120 days of your IID term must be completely violation-free before removal is authorized. A violation during that 120-day window adds 120 more days (repeatable — multiple violations keep adding). A violation earlier in your term restarts the 120-day clock. After any violation, you must complete 120 consecutive clean days before you can count toward removal again.
What happens if I remove the IID without authorization in Tennessee?
Unauthorized removal restarts your entire IID term from the beginning under TCA 55-10-425 — not just the 120-day window. This is the most severe consequence in Tennessee’s program. Never remove the device without written authorization from the Department of Safety, regardless of how close you are to the end of your term.
What is the EMIF and how do I qualify?
The Electronic Monitoring Indigency Fund (TCA 55-10-419) pays up to $170/month toward IID costs for qualifying drivers who receive a court finding of indigency. The driver still pays a minimum $30/month. The IID component was moved to TN OCJP in October 2023 after funding strain. Confirm current availability and enrollment procedures with TN OCJP or the Department of Safety before relying on this program.
How long is the IID requirement in Tennessee?
365 days minimum for a first offense (or the full revocation period if longer), with the final 120 days violation-free. 730 days for a second offense; 2,190 days for a third offense; 2,920 days for a fourth or subsequent. Any violation during the final 120-day window adds another 120 days — repeatable.
Sources:
TN Dept. of Safety — Ignition Interlock;
TCA 55-10-409; 55-10-417; 55-10-425; 55-10-419.
Last verified August 2026.
Advertising disclosure: We may be compensated when you contact a provider through our numbers or links. This doesn’t affect our rankings or information. Content is informational only — not legal advice. Verify TN approval before installation.