Wisconsin OWI Ignition Interlock Requirements (2026): Who Needs One, Costs & Approved Providers
Wisconsin is not an all-offender state — a standard first OWI with BAC below 0.15% does not require an ignition interlock. IID becomes mandatory for a first offense with BAC 0.15% or higher, or for an improper refusal. The IID clock starts only when DMV issues a license after conviction — not at conviction itself. Courts may halve IID costs for drivers at 150% of the federal poverty line. Here’s who needs one and what to expect.
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Wisconsin OWI interlock requirements at a glance
| Offense term | OWI (Operating While Intoxicated) — Wis. Stat. 346.63 |
| All-offender? | No — standard first OWI under 0.15% BAC does not require an IID. IID is mandatory for 1st offense at BAC 0.15%+, 1st offense improper refusal, and all 2nd+ offenses (343.301(1g); 343.305). |
| 1st offense, BAC under 0.15% | No IID required under current law (Wis. Stat. 343.301(1g)). Note: a passenger under 16 doubles all penalties and makes the offense criminal (346.65(2)(f)) — the increased revocation period may affect IID eligibility; confirm with your attorney. |
| 1st offense, BAC 0.15%+ | IID mandatory, minimum 1 year (343.301(1g)). Clock starts at DMV license issuance after conviction — not at conviction. |
| 1st offense, improper refusal | IID mandatory, minimum 1 year (343.305). Clock starts at DMV license issuance. |
| 2nd offense | IID mandatory, minimum 1 year up to the maximum revocation period (12–18 months if prior within 10 years). Clock starts at DMV license issuance. |
| 3rd+ offense | IID mandatory, minimum 1 year up to 2–3 year maximum revocation. Clock starts at DMV license issuance. |
| Clock start | IID term runs from the date DMV issues a license after conviction — not from conviction, arrest, or revocation start. There is no “time served” on the IID from the period before license issuance. |
| Removal | Device stays until the court-ordered IID period is fulfilled (from DMV license issuance). Removal documented on WisDOT/DMV form MV3598. Early removal risks license cancellation. |
| Violations under current law | No automatic time extensions under current Wisconsin law. Tampering or non-compliance constitutes a violation of the court order — penalties include fines, possible imprisonment, and license cancellation. |
| 2025 Act 210 — upcoming change | Wisconsin 2025 Act 210 adds +180-day extensions per violation when implemented — expected around 2027. The current no-automatic-extension framework applies until then. |
| Indigency relief | Court may halve installation, removal, and daily maintenance costs for drivers with household income ≤ 150% of the nonfarm federal poverty line (343.301(3)(b)) |
| IID surcharge | $50 paid to the clerk of court (343.301(5)) |
| License fees | Approximately $240 in total license reinstatement and restriction fees per WisDOT fee chart (confirm current amounts with WisDOT) |
| SR-22 required? | Yes — 3 years from reinstatement eligibility date (WisDOT) |
| Who approves providers | WisDOT/DMV — WisDOT — IID |
| Governing law | Wis. Stat. 343.301; 343.305; 346.65(2)(f) |
Does your Wisconsin OWI require an interlock?
- First OWI, BAC under 0.15%: No IID required. Wisconsin does not mandate an IID for a standard first offense under 0.15%. (If a minor under 16 was in the vehicle, penalties double and the offense becomes criminal — the increased revocation may affect your situation; confirm with your attorney.)
- First OWI, BAC 0.15%+: IID mandatory for a minimum of 1 year from DMV license issuance.
- First offense, improper refusal: IID mandatory for a minimum of 1 year from DMV license issuance.
- Any second or subsequent OWI: IID mandatory for a minimum of 1 year, up to the maximum revocation period.
Wisconsin’s IID clock starts at DMV license issuance — not at conviction. Under Wis. Stat. 343.301, the IID restriction period begins running only on the date Wisconsin DMV issues you a license after conviction. Time spent during revocation before a license is issued does not count toward the IID term. If you wait months after conviction to apply for reinstatement, your IID term hasn’t started. Get your license reinstated promptly to start the clock — delaying costs you time at the end, not the beginning.
Wisconsin currently has no automatic violation time extensions — but 2025 Act 210 will change this around 2027. Under current Wisconsin law, tampering with or circumventing the IID does not automatically add time to your restriction period — it instead constitutes a violation of the court order, subject to fines, possible imprisonment, and license cancellation. Wisconsin 2025 Act 210 will add +180-day extensions per violation once implemented, which is expected around 2027. Until that law takes effect, the current no-automatic-extension framework applies. Check with WisDOT for implementation status if your offense is in the 2026–2027 timeframe.
Indigency relief — court halves costs at 150% of poverty line
Under Wis. Stat. 343.301(3)(b), the court may order IID costs to be reduced by half for drivers with household income at or below 150% of the nonfarm federal poverty line. This covers installation, removal, and per-day maintenance costs. To access this:
- Raise the indigency issue at sentencing — the court must make the finding and issue the order
- Show documentation of household income at or below 150% of the nonfarm federal poverty guidelines
- The halved rate applies to the provider directly — confirm the reduced rate applies before signing
WisDOT-approved providers
Three major national providers are approved by WisDOT. Guardian, Dräger/RoadGuard, and ALCOLOCK do not appear on the current Wisconsin 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 WisDOT approval at wisconsindot.gov before signing. Guardian, Dräger/RoadGuard, and ALCOLOCK are not on the WI list. If you qualify for indigency relief, confirm the halved rate applies before signing.
What an interlock costs in Wisconsin
| Installation (one time) | $70–150 (half price if court-ordered indigency relief) |
| Monthly lease + maintenance | $60–100 (half price if court-ordered indigency relief) |
| Removal | $50–75 (half price if court-ordered indigency relief) |
| IID surcharge to clerk of court | $50 |
| WisDOT license fees (est.) | ~$240 (confirm current amounts with WisDOT) |
Over a 1-year minimum first-offense term: roughly $1,100–1,650 including fees; potentially $600–900 with court indigency relief. Estimate your exact cost →
How to get installed — 5 steps
- Confirm whether an IID was court-ordered. If your BAC was under 0.15% on a first offense, no IID is required. If BAC was 0.15%+ or you refused, the IID is mandatory. If cost is a concern, raise the indigency issue at sentencing — the court must make the finding before the order is issued.
- Contact a WisDOT-approved provider, confirm current approval, and schedule installation. Pay the $50 IID surcharge to the clerk of court.
- Apply to Wisconsin DMV for your license with the IID restriction. The 1-year IID term does not start until DMV issues the license — apply promptly.
- Drive for the full court-ordered IID period from license issuance. Under current law, tampering violates the court order and risks fines, jail, and license cancellation. Note that 2025 Act 210 (expected ~2027) will add +180-day extensions per violation.
- After the IID period ends, document removal with WisDOT/DMV form MV3598. Do not remove the device before the court-ordered period is fulfilled from license issuance — early removal risks license cancellation.
Clock starts at license issuance — get reinstated promptly to start your term.
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Wisconsin requires SR-22 insurance for 3 years from reinstatement eligibility. See Wisconsin SR-22 costs and cheapest carriers →
Wisconsin OWI interlock FAQ
Does a standard first OWI in Wisconsin require an interlock?
No — a standard first OWI with BAC under 0.15% does not require an IID under Wis. Stat. 343.301(1g). IID is mandatory only for first offenses with BAC 0.15%+ or an improper refusal, and for all second and subsequent offenses. If your BAC was under 0.15% on a first offense, you are not required to install an IID.
When does Wisconsin’s IID clock start?
The IID restriction period begins on the date Wisconsin DMV issues you a license after conviction — not at conviction, arrest, or revocation start. Time during revocation before license issuance does not count. Apply for license reinstatement promptly after conviction to start your IID term as soon as possible — delay costs you time at the end, not the beginning.
Are there automatic time extensions for violations in Wisconsin?
Not under current Wisconsin law. Tampering with or circumventing the IID constitutes a violation of the court order — consequences include fines, possible imprisonment, and license cancellation — but no automatic time is added to the restriction period under current law. Wisconsin 2025 Act 210 will add +180-day extensions per violation when implemented, expected around 2027. Check with WisDOT for implementation status.
How do I qualify for the court indigency cost reduction?
Under Wis. Stat. 343.301(3)(b), if your household income is at or below 150% of the nonfarm federal poverty line, the court may order IID costs (installation, removal, and daily maintenance) to be halved. Raise this at sentencing — the court must make the finding and issue the order. Confirm the halved rate with your chosen provider before signing.
What is 2025 Act 210 and does it affect me?
Wisconsin 2025 Act 210 adds +180-day IID restriction extensions per violation when implemented — expected around 2027. Until it takes effect, the current framework applies (no automatic extensions; violations are court-order violations subject to fines/jail/cancellation). If your offense or IID period is in the 2026–2027 timeframe, confirm the current implementation status with WisDOT before assuming which rules apply.
Sources:
WisDOT — Ignition Interlock Device;
Wis. Stat. 343.301; 343.305; 346.65(2)(f); 2025 Act 210.
Last verified August 2026.
Advertising disclosure: We may be compensated when you contact a provider through our numbers or links. Content is informational only — not legal advice. Verify WisDOT approval before installation.