Updated May 2026
What Is Ignition Interlock Insurance Insurance?
Ignition interlock insurance is liability auto insurance—often paired with an SR-22 or FR-44 filing—on a vehicle equipped with an ignition interlock device. The carrier issues an endorsement or certificate confirming the IID is active and your coverage meets state minimum liability requirements. Courts and DMVs require this proof before they'll issue a restricted or hardship license after DUI. The IID itself prevents the vehicle from starting if the driver's breath alcohol concentration exceeds a preset threshold, typically .02 or .025 BAC. The insurance endorsement proves you're insured while using it.
- You're convicted of DUI with a .10 BAC in Los Angeles County. The court orders IID installation for six months and an SR-22 filing for three years. You install the device within ten days, your carrier adds the IID endorsement, files your SR-22, and issues a certificate to the DMV. Your premium jumps from $140 to $260 per month. Total first-year cost including IID: $4,620.
- You're convicted of a second DUI in Orange County. Florida requires an FR-44 filing for three years and IID for one year minimum. You don't own a vehicle, so you buy non-owner liability with FR-44 and rent a vehicle equipped with IID when needed. Your non-owner policy costs $95 per month. IID rental adds $150 per use. Total annual insurance cost: $1,140.
- You're approved for an Occupational License after a first-offense DWI in Harris County. Texas requires IID for the full restricted period—typically one year—and SR-22 for two years. Your carrier confirms IID installation, files SR-22 with the state, and provides a certificate to present at your court hearing. Your premium rises from $120 to $240 per month. IID costs add $75 install plus $80 monthly. Total first-year cost: $3,915.
How Much Does Ignition Interlock Insurance Insurance Cost?
The IID endorsement itself adds $0–$25 per month to your premium. The real cost driver is the DUI violation surcharge: 60 to 120 percent above your base rate, or $85–$180 added monthly for liability-only coverage.
- DUI offense count—first offense typically adds 60–80 percent, second offense 90–150 percent
- SR-22 or FR-44 filing requirement—adds $15–$50 per month depending on state and carrier
- IID duration—six months costs less total than two or three years of monthly fees
- Coverage level—state minimum liability runs $140–$260/month post-DUI, full coverage $280–$450/month
- Carrier acceptance—some carriers exit after DUI, forcing you to non-standard insurers with higher base rates
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Who Needs Ignition Interlock Insurance Insurance?
You need ignition interlock insurance if a court or DMV has ordered IID installation as a condition of your restricted, hardship, or occupational license after DUI. This applies in all states with IID programs—most now require it for first-offense DUI if BAC was .15 or higher, and all states require it for second or subsequent offenses. If you don't own a vehicle, you'll need non-owner liability with the IID endorsement to satisfy filing requirements, even if you're not driving.
Read your court order and DMV approval letter. If either document lists IID as a requirement, you need this endorsement before you can legally drive. If your state offers a choice between IID and a longer suspension period, calculate total cost—IID plus insurance for one year often costs $3,500–$5,500, but lets you drive to work. A six-month suspension costs zero but may cost you your job.