What Is an Aggravated DUI in Illinois: Felony Classes and Penalties

An aggravated DUI in Illinois is a felony drunk driving charge that applies when specific circumstances make the offense more serious than a standard first-offense DUI. While an ordinary DUI is a Class A misdemeanor, factors like prior convictions, serious injury or death, or driving without a license push the charge into felony territory, where sentences run from one year up to 30 years in prison depending on the class.¹

What Turns a DUI Into an Aggravated DUI

Illinois law lists more than a dozen circumstances that elevate a routine DUI into a felony. Prior convictions are the most common trigger. A third DUI is automatically aggravated, and Illinois uses a lifetime lookback, so a conviction from decades ago still counts.¹

Crashes that hurt or kill someone make up the other major category. A DUI that causes great bodily harm, permanent disability, or disfigurement to another person is aggravated. If someone dies and your impaired driving was a proximate cause, you face one of the most serious versions of the charge.¹

Several other situations also qualify:

Driving impaired while transporting a child under 16.
Operating a school bus with passengers aboard while impaired.
Causing bodily harm in a crash while impaired through an active school speed zone.
Driving under the influence without a valid license, permit, or liability insurance.
Driving a vehicle for hire with passengers.

Each of these factors on its own turns a misdemeanor DUI into a felony. If more than one applies, the charge lands in whichever felony class is most severe.¹

Felony Classes

Not every aggravated DUI carries the same weight. The felony class is what controls your sentencing range, and the trigger determines the class.

Class 4 (The Default)

Any aggravated DUI that doesn’t fit into a more severe category is a Class 4 felony. This covers DUIs aggravated by driving without a valid license, driving uninsured, or causing great bodily harm or permanent disfigurement in a crash.¹ The Illinois State Police classifies crashes causing great bodily harm or permanent disfigurement in this default Class 4 category.²

Class 3

Certain aggravated DUI scenarios fall into Class 3. A Class 3 aggravated DUI is not eligible for probation or conditional discharge.¹

Class 2

Repeat offenders and the most harmful outcomes cluster here. A third DUI conviction is a Class 2 felony. So is a fourth, though a fourth removes any possibility of probation. A DUI that results in someone’s death is also Class 2, with its own sentencing rules described below.

Driving impaired while transporting a child under 16 also falls into Class 2, carrying a mandatory $2,500 fine and 25 days of community service benefiting children on top of other penalties. If the child was hurt in the crash, the mandatory fine doubles to $5,000.¹

Class 1 and Class X

A fifth DUI is a Class 1 felony, and probation is unavailable. A sixth or subsequent DUI reaches Class X, the most serious felony classification in Illinois short of first-degree murder.¹

Prison Time and Fines

The felony class sets the sentencing range:

Class 4: 1 to 3 years in prison, or 3 to 6 years on an extended term.
Class 3: 2 to 5 years.
Class 2: 3 to 7 years.
Class 1: 4 to 15 years.
Class X: 6 to 30 years.

The Class 4 range comes from the Illinois Unified Code of Corrections.³ Fines for any Illinois felony conviction can reach $25,000.

DUI deaths carry their own mandatory minimums that override the standard Class 2 range. A single fatality requires at least 3 years in prison, with a ceiling of 14. If two or more people died, the floor rises to 6 years and the ceiling to 28.¹

When Probation Is Not an Option

Probation eligibility narrows as the felony class rises. Some Class 4 aggravated DUIs allow probation. A fourth DUI, a fifth, and any Class X aggravated DUI all explicitly bar it. DUI-related deaths generally require a prison sentence unless the court finds extraordinary circumstances justifying probation.¹

What Happens to Your License

An aggravated DUI conviction triggers a separate action by the Illinois Secretary of State against your driving privileges. That revocation happens independently of what the criminal court does, and it lasts far longer than for a misdemeanor DUI.

The length depends mostly on your prior DUI record. A third conviction carries a minimum 10-year revocation. A fourth or later conviction results in a lifetime revocation. If the aggravated DUI involved a fatality or great bodily harm, the minimum revocation is two years regardless of how many priors you have.

Getting your license back after the revocation period is not automatic. You have to go through a formal hearing with the Secretary of State and show you no longer pose a risk to public safety. That typically means a professional substance abuse evaluation, evidence of treatment or rehabilitation, and a sustained period of sobriety. Many applicants also need to install a breath alcohol ignition interlock device (BAIID) as a condition of any restricted driving relief, which adds several hundred dollars in installation and monthly monitoring costs.

You’ll also need to file SR-22 proof of insurance, a certificate from your insurer confirming you carry at least the state-required minimum liability coverage. SR-22 requirements after a DUI revocation typically last three years and raise premiums substantially.

Consequences Beyond the Criminal Case

The sentence and license loss are the immediate concerns, but a felony aggravated DUI reaches into other parts of your life.

Firearm Rights

Federal law prohibits anyone convicted of a felony from possessing firearms. Because every aggravated DUI in Illinois is a felony, a conviction strips your right to own or carry a gun. The prohibition applies even after you finish your sentence, and restoring federal firearm rights requires either a presidential pardon or relief from the Bureau of Alcohol, Tobacco, Firearms and Explosives.

Entering Canada

Canada treats impaired driving as a serious criminal offense and routinely denies entry to people with DUI convictions, misdemeanors included. A felony aggravated DUI makes entry harder still. Canadian border officers have access to U.S. criminal databases and can turn you away at the airport or land crossing. You may eventually qualify under Canada’s Criminal Rehabilitation program, but only after at least five years have passed since you completed your entire sentence, including probation and fines.

Jobs and Professional Licenses

A felony conviction shows up on background checks and can disqualify you from jobs in healthcare, education, law enforcement, transportation, and other licensed fields. Illinois has some protections limiting how employers can use criminal records, but a felony DUI still creates substantial barriers, especially for positions that involve driving or working with vulnerable populations.

1
Illinois General Assembly. 625 ILCS 5/11-501 – Driving Under the Influence of Alcohol, Other Drug or Drugs, Intoxicating Compound or Compounds or Any Combination Thereof
2
Illinois State Police. Impaired Driving
3
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-45 – Class 4 Felonies; Sentence