DUI Laws in Illinois (DUI)
Illinois uses the term "DUI" for impaired driving offenses. The standard BAC limit is 0.08%. The lookback period is Lifetime. 3rd DUI conviction (lifetime lookback — any two prior DUI convictions from any time). Also a felony if: BAC 0.16+ with 2nd offense. Below are the full details of Illinois's DUI laws and penalties.
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Overview
Illinois has one of the most complex DUI sentencing frameworks in the country, with a wide range of classifications from Class A misdemeanor to Class X felony depending on the circumstances. The state pioneered the use of Monitoring Device Driving Permits (MDDP) that allow first-time DUI offenders to continue driving with a Breath Alcohol Ignition Interlock Device (BAIID) during their summary suspension. Illinois uses a lifetime lookback for felony DUI — any two prior DUI convictions from any time period make a third DUI a Class 2 felony. The state also has a robust court supervision system for first offenders that can prevent a formal conviction from going on the record.
Official term: DUI
BAC Limits
| Driver Type | BAC Limit |
|---|---|
| Standard (21+) | 0.08% |
| Commercial (CDL) | 0.04% |
| Under 21 | 0.00% (zero tolerance) |
| Enhanced Penalty | 0.16% — triggers aggravated DUI classification with mandatory minimum penalties |
Penalties by Offense
| Offense | Classification | Jail Time | Fines | License Suspension | IID |
|---|---|---|---|---|---|
| 1st Offense | Class A misdemeanor | Up to 1 year in county jail; no mandatory minimum (court supervision available to avoid conviction). If BAC 0.16+: mandatory minimum 100 hours community service and $500 fine | Up to $2,500. If BAC 0.16+: mandatory minimum $500 additional fine | 6-month statutory summary suspension (SSS) if failed chemical test; 1-year SSS if refused test. Eligible for MDDP with BAIID immediately. | MDDP (Monitoring Device Driving Permit) with BAIID available immediately during suspension for first offenders — allows unrestricted driving with the device installed |
| 2nd Offense | Class A misdemeanor | Up to 1 year; mandatory minimum 5 days in jail OR 240 hours of community service | Up to $2,500 | 1-year SSS if failed test; 3-year SSS if refused test. Minimum 1-year revocation upon conviction. Not eligible for MDDP (second offenders must apply for Restricted Driving Permit after minimum hard suspension). | Mandatory BAIID installation for any Restricted Driving Permit (RDP); minimum 5-year RDP with BAIID after revocation |
| 3rd Offense | Class 2 felony (aggravated DUI — 3rd offense regardless of time between offenses) | 3–7 years in state prison; mandatory minimum 5 days in jail or 480 hours community service if probation granted (probation is possible) | Up to $25,000 | Minimum 10-year revocation; may be eligible for RDP with BAIID after 1 year of revocation | Mandatory BAIID for any driving permit; extended requirement |
| Felony | Class 2 felony (3rd offense); Class 1 felony (4th); Class X felony (6th+, or aggravated circumstances) | Class 2: 3–7 years. Class 1: 4–15 years. Class X: 6–30 years. Mandatory minimums apply at each level. | Up to $25,000 for all felony DUI levels | Class 2: 10-year minimum revocation. Class 1 & X: permanent revocation; may petition for reinstatement after extended period | Mandatory BAIID for any driving permit granted during or after revocation |
Felony threshold: 3rd DUI conviction (lifetime lookback — any two prior DUI convictions from any time). Also a felony if: BAC 0.16+ with 2nd offense, child passenger, no valid license/insurance, school zone, or causing injury/death.. Lookback period: Lifetime — Illinois uses a lifetime lookback for determining felony DUI status. Any two prior DUI convictions from any time in your life make a third DUI a Class 2 felony. However, for statutory summary suspension purposes (administrative penalties), only offenses within the past 5 years are considered for MDDP eligibility..
Additional Penalty Details
| Offense | Community Service | Probation | DUI School |
|---|---|---|---|
| 1st Offense | Mandatory 100 hours if BAC 0.16+; otherwise discretionary | Court supervision for 12–24 months available (avoids formal conviction); or up to 2 years conditional discharge/probation | Mandatory alcohol/drug evaluation (by a licensed provider); completion of recommended education or treatment program required |
| 2nd Offense | 240 hours if elected in lieu of 5-day minimum jail sentence | Up to 2 years probation or conditional discharge (no court supervision available for second offense) | Mandatory evaluation and completion of recommended treatment program; may require intensive outpatient or residential treatment |
| 3rd Offense | 480 hours if elected in lieu of mandatory minimum jail | Probation is available for Class 2 felony DUI; up to 4 years with intensive conditions | Mandatory substance abuse evaluation and treatment; may include residential program |
| Felony | Court-determined; varies by felony class | Available for Class 2 and Class 1 (at judge's discretion); not available for Class X felony | Mandatory substance abuse evaluation and intensive treatment program; inpatient treatment may be required |
Implied Consent Law
Under 625 ILCS 5/11-501.1, Illinois's implied consent law provides that anyone driving on Illinois roads consents to chemical testing (breath, blood, urine, or other bodily substance) when an officer has reasonable grounds to believe the driver is under the influence. The officer must advise the driver that a refusal will result in a longer statutory summary suspension.
Refusal penalties: First offense refusal: 1-year statutory summary suspension (vs. 6 months if you take and fail the test). Second offense refusal: 3-year SSS (vs. 1 year for failing). Refusal can be used as evidence in court. First-time refusers are NOT eligible for the MDDP driving permit during their suspension.
Aggravating Factors
| Factor | Impact |
|---|---|
| BAC of 0.16% or higher | Mandatory minimum $500 additional fine and 100 hours community service on first offense; felony aggravating factor on subsequent offenses |
| Child passenger under 16 | Aggravated DUI — felony charge (Class 4 or higher) even on first offense; mandatory minimum 6 months in jail and 25 days community service |
| No valid driver's license or insurance | Aggravated DUI — enhances misdemeanor to felony classification; additional mandatory penalties |
| DUI in a school zone | Aggravated DUI — enhanced classification; mandatory minimum fine of $1,000 additional |
| Causing great bodily harm or disfigurement | Aggravated DUI — Class 4 felony (1–3 years) or higher depending on severity; mandatory prison sentence possible |
| Prior reckless driving reduced from DUI | Counts as a prior DUI for lookback purposes; can trigger felony classification on subsequent DUI |
DUI with Injury
Classification: Aggravated DUI — felony ranging from Class 4 to Class X depending on severity
DUI causing bodily harm: Class A misdemeanor to Class 4 felony (1–3 years). DUI causing great bodily harm, permanent disability, or disfigurement: Class 4 felony (1–12 years). DUI causing death (aggravated DUI): Class 2 felony (3–14 years); reckless homicide charges may also apply (Class 3 felony, 2–5 years). Multiple deaths or prior DUI with death: Class X felony (6–30 years, no probation).
Underage DUI
Illinois has the strictest underage BAC limit in the nation — any detectable amount of alcohol results in penalties. Under 21 with any BAC: 3-month license suspension for first violation, 1-year suspension for second. If BAC reaches 0.08%, full adult DUI penalties apply. Cannabis — any amount of THC in a driver under 21 also triggers zero-tolerance provisions.
Diversion Programs
Program: Court Supervision / DUI Court Programs
Illinois's court supervision system is one of the most offender-friendly in the nation for first DUI offenders. Court supervision is NOT a conviction — upon successful completion, the case is dismissed and does not appear as a conviction on the driving record (though it remains in court records). Many counties also operate dedicated DUI Courts for repeat offenders, offering intensive supervision and treatment as an alternative to prison.
Eligibility: Court supervision is available only for first DUI offenders (one-time only; you can never receive supervision for a DUI again). You must have no prior DUI supervision or conviction. DUI Court programs for repeat offenders vary by county but typically require a substance abuse diagnosis and willingness to participate in 12–24 months of intensive programming.
How Long a DUI Stays on Your Record
A DUI conviction in Illinois is permanent and cannot be expunged or sealed. Even court supervision (which is not a conviction) for DUI cannot be expunged — it remains on your court record and driving abstract permanently. Illinois is strict: DUI is one of the few offenses specifically excluded from the state's expungement and sealing statutes under 20 ILCS 2630. All prior DUI dispositions count for lifetime lookback purposes.
Key Statutes
- 625 ILCS 5/11-501
- Driving under the influence — main DUI statute defining offenses, BAC limits, penalties, and aggravating factors
- 625 ILCS 5/11-501.1
- Implied consent and statutory summary suspension — chemical testing requirements and suspension procedures
- 625 ILCS 5/11-501.01
- Additional penalties for DUI — aggravated DUI classifications (felony enhancements)
- 625 ILCS 5/6-208.1
- Monitoring Device Driving Permit (MDDP) — provisions for driving with BAIID during suspension
- 625 ILCS 5/11-501.4-1
- DUI with child passenger — specific penalties for driving under the influence with a child in the vehicle
Frequently Asked Questions
Is a DUI a felony in Illinois?
What is court supervision for DUI in Illinois?
What is the penalty for a first DUI in Illinois?
Can you get a DUI expunged in Illinois?
What is the MDDP / BAIID program in Illinois?
How long does a DUI stay on your record in Illinois?
Can you refuse a breathalyzer in Illinois?
How much does a DUI cost in Illinois?
Related Guide
DUI license recovery in Illinois→Step-by-step guide to getting your license back after a DUI in Illinois — suspension periods, IID requirements, SR-22 insurance, reinstatement fees, and process.
Take Action — Direct Links
- Illinois Secretary of State — DUI Information
Official Illinois resource for DUI license suspension, reinstatement, MDDP/BAIID program details, and hearing information
- Illinois Compiled Statutes — Chapter 625 (Vehicles)
Full text of Illinois DUI laws including 11-501 and related provisions
- Illinois Courts — DUI/Drug Court Programs
Information on Illinois problem-solving courts including DUI Court programs across the state
- Illinois State Bar Association — Lawyer Finder
Find a qualified DUI defense attorney through the Illinois State Bar Association's referral service
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