Illinois DUI Laws & Penalties (2026)
Illinois uses a lifetime lookback period. DUI cannot be expunged or sealed. The state offers MDDP (Monitoring Device Driving Permit) with IID during suspension.
Last updated: March 2026 · Laws verified against Illinois statutes
Illinois DUI Penalties
1st Offense
2nd Offense
BAC Limits in Illinois
💰 Estimated Total Cost
A first DUI in Illinois typically costs $10,000-$25,000+ including fines, attorney, classes, IID, and insurance increases.
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Illinois DUI Deep Dives
🚨 First Offense Penalties
Complete guide to what happens on your first DUI in Illinois.
🍺 BAC Limit
Legal BAC limits for standard, commercial, and under-21 drivers.
💰 DUI Cost
Full cost breakdown: fines, attorney, classes, insurance, and more.
🔧 Ignition Interlock Cost
IID installation, monthly fees, and provider comparison.
🚫 License Suspension
Suspension length, restricted license options, and reinstatement steps.
🧮 Cost Calculator
Estimate your total DUI cost with our interactive tool.
Official Sources & References
- 📋 625 ILCS 5/11-501 — Illinois DUI statute
- 🚗 Illinois DMV — License suspension, reinstatement, IID requirements
- 📊 NHTSA Impaired Driving Data
- 🛡️ MADD — Mothers Against Drunk Driving
DUIFinders.com is not a law firm and does not provide legal advice. Information is for general purposes only. Consult a licensed attorney in Illinois for advice specific to your situation.
Illinois DUI FAQ
What is the BAC limit in Illinois?
The legal BAC limit in Illinois is 0.08% for regular drivers, 0.04% for commercial drivers, and 0.00% for drivers under 21.
What are the penalties for a first DUI in Illinois?
A first DUI in Illinois is a Misdemeanor. Penalties include Up to 1 year jail, Up to $2,500 in fines, and 6-month suspension (1 year if test refused) license suspension.
Is an ignition interlock device required in Illinois?
Required for MDDP (driving permit during suspension)
Can a DUI be expunged in Illinois?
No, Illinois does not allow DUI expungement.
What is the lookback period for DUI in Illinois?
Illinois uses a Lifetime lookback period to determine if an offense counts as a repeat offense.