Updated May 2026
What Is Ignition Interlock Insurance Insurance?
Ignition interlock insurance covers liability for injuries and property damage you cause while operating a vehicle equipped with a court-ordered IID. The coverage itself is identical to standard liability insurance. The difference is pricing: carriers classify IID-required drivers as high-risk, which triggers higher premiums and often forces placement with non-standard or assigned-risk insurers. In Indiana, Montana, Wyoming, Colorado, and Delaware, the policy must meet state minimum liability limits and include SR-22 certification filed with the DMV. New Jersey does not require SR-22 but mandates proof of coverage and imposes annual surcharges of $1,000 to $3,000 paid directly to the MVC for three years.
- You hold a Montana Probationary License and rear-end another vehicle while driving to work with your IID installed. The other driver has $9,000 in medical bills and $6,000 in vehicle damage. Your ignition interlock insurance liability coverage pays the full $15,000 if your policy limits meet or exceed that amount. The IID itself has no bearing on claim payout. The surcharge you paid reflects the carrier's assessment of DUI recidivism risk, not a coverage limitation.
- You hold a New Jersey Conditional License (Cinderella License) and cause an accident during approved driving hours. The other driver sustains $18,000 in combined medical and property damage. Your policy pays up to your liability limit. However, if the accident occurred after midnight or outside approved purposes, the claim still processes normally under liability coverage, but you face separate administrative penalties from the MVC for violating Cinderella License time restrictions. New Jersey carriers do not deny claims based on time-of-day violations, but the MVC may revoke your Conditional License.
- Your Colorado Early Reinstatement policy is active when your IID malfunctions and you drive the vehicle to the service center for recalibration without prior approval. If you cause an accident during that trip, your liability coverage remains in effect. Carriers do not deny claims based on temporary IID noncompliance. The state may impose administrative penalties separately, but the insurance contract covers liability regardless of device status at the time of the accident.
How Much Does Ignition Interlock Insurance Insurance Cost?
Ignition interlock insurance adds $15 to $40 per month to standard liability premiums, or $180 to $480 annually, based on available industry data.
- Time since DUI conviction — premiums decline after 12 months of clean IID monitoring records in most states.
- Number of prior DUI offenses — second or third offenses trigger assignment to non-standard carriers with premiums 150% to 300% above standard rates.
- Probationary license type — New Jersey Cinderella License holders pay NJ MVC surcharges of $1,000 to $3,000 annually for three years in addition to insurance premiums, while other states in this family require SR-22 filing at $15 to $50 per year.
- Carrier classification — standard carriers decline most IID-required drivers, forcing placement with non-standard insurers like The General, Bristol West, or state assigned-risk pools where base premiums start 200% higher.
- State minimum liability limits — Indiana requires 25/50/25, Montana 25/50/20, Wyoming 25/50/20, Colorado 25/50/15, Delaware 25/50/10, and New Jersey 15/30/5, with higher limits adding $10 to $30 per month.
- IID monitoring compliance — carriers review IID vendor reports every six months and may reduce surcharges by 10% to 20% after 12 consecutive months with zero failed start attempts or tampering violations.
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Who Needs Ignition Interlock Insurance Insurance?
Ignition interlock insurance is legally required for all drivers holding a Probationary License in Indiana, Montana, or Wyoming, an Early Reinstatement in Colorado, or a Conditional License in Delaware or New Jersey after a DUI conviction. You cannot drive legally during the IID period without an active liability policy meeting state minimums. Carriers verify IID installation with your device vendor before issuing or renewing coverage.
If you need to drive for work, school, or medical appointments during your suspension, the probationary license route with IID and ignition interlock insurance is the only legal option. Calculate total cost: IID device fees run $70 to $150 per month, insurance surcharges add $15 to $40 per month, SR-22 filing costs $15 to $50 annually in most states, and New Jersey MVC surcharges add $1,000 to $3,000 per year for three years. If total annual cost exceeds $3,000 and you can arrange alternative transportation, waiting out the suspension may be financially preferable.