Wisconsin Ignition Interlock Device: Requirements, Costs, and What to Expect

When Wisconsin Requires an Ignition Interlock Device

An IID is mandatory in Wisconsin for three categories of OWI offenses: all repeat OWI convictions, all chemical test refusals, and any first-offense OWI where the blood alcohol concentration was 0.15% or higher. The court orders the IID restriction, and the device must be installed on every vehicle titled or registered to the offender — not just the one they were driving.

That "every vehicle" requirement catches people off guard. If you own two cars and your spouse's truck is registered in both your names, the interlock goes on all three. The only exception is if the court specifically exempts a particular vehicle from the order.

IID Installation and Maintenance

You must use a state-certified IID provider. After installation, the provider transmits electronic proof directly to the WisDOT DMV database. Wait at least one full business day after installation before visiting a DMV service center — the data needs time to populate in their system.

Once the device is active, you must maintain a strict 0.02% BAC limit while driving. The vehicle needs professional calibration and servicing at intervals no longer than 60 days. Miss a calibration appointment and the device enters lockout mode, which gets reported to the DMV as a violation.

What an IID Actually Costs

The financial burden of an interlock adds up quickly:

• Installation fee: $75–$150
• Monthly lease and calibration: $60–$100 per month
• Removal fee: $50–$100
• Court IID surcharge: $50

For a one-year IID order, you're looking at roughly $1,000–$1,500 total — and that's per vehicle. Multiply that by every vehicle you own.

The Hardship Cost Reduction

Wisconsin law provides a financial hardship exception that many drivers don't know about. If your verified annual income falls below 150% of the Federal Poverty Level, you're legally entitled to a 50% reduction in both the installation fee and the monthly lease rates. Ask your IID provider about this when scheduling installation — they're required to honor it.

IID Removal

Removal only happens after you've served the full restriction period ordered by the court. The provider deinstalls the device and transmits the completion record to the DMV. Attempting to remove the device early or tamper with it can trigger an IID violation and additional administrative consequences; do not remove or tamper with it outside the authorized process.

What's Changing Under Act 210 (Effective 2027)

Governor Evers signed 2025 Wisconsin Act 210 on April 8, 2026, but the substantive provisions aren't operative yet. The law takes effect the first day of the 12th month after the Joint Committee on Finance funds WisDOT's electronic tracking infrastructure — projected for Spring 2027. Until then, all pre-Act 210 rules remain in force.

Here's what changes when Act 210 takes effect:

Faster occupational license eligibility. Under current rules, repeat OWI offenders must wait 45 days and first-offense refusals must wait 30 days before applying for an occupational license. Act 210 eliminates both waiting periods — drivers become eligible immediately upon IID installation.

Compliance-based monitoring. The current system uses fixed-date calendar restrictions. Act 210 shifts to a compliance-based model where violations extend the restriction period. Each violation occurring 60 or more days after installation triggers an automatic 180-day extension.

Motorcycle ban. Act 210 introduces an absolute ban on operating any Class M motorcycle while subject to an IID order. Under current law, there's no such blanket prohibition.

Tougher violation penalties. IID tampering or circumvention becomes a criminal misdemeanor under § 343.302, carrying a $350–$1,100 fine and 5 days to 6 months in jail. Conviction also triggers a 12-to-18-month license revocation and immediate cancellation of any occupational license.

Navigating IID Compliance

The interlock is one piece of the reinstatement puzzle — you'll also need to complete your AODA assessment, file SR-22 insurance, and clear any other holds before the DMV restores your full driving privileges. The Wisconsin Driver's License Reinstatement Guide covers the complete sequence so you can track every requirement and get back on the road without missteps.

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