A felony charge in Illinois carries vastly different consequences depending on its class — from one year of probation-eligible time to thirty years of mandatory prison. For anyone facing a felony case in Joliet or anywhere in Will County, understanding the Illinois felony classes is where defense planning starts.
Illinois sorts felonies into five classes — Class 4, 3, 2, 1, and X — plus first-degree murder, which sits in its own category above Class X. This guide walks each class in order, with sentencing ranges, common offenses, and how a Joliet defense attorney approaches the case at each level. For broader context on how Illinois prosecutes felony matters, see our overview of Illinois felony charges and defenses.
How Illinois Ranks Felony Charges
The five Illinois felony classes are set by statute (730 ILCS 5/5-4.5). Each class has a baseline sentencing range and an “extended term” range that applies when statutory aggravating factors exist — most commonly a prior conviction of the same or higher class within a defined lookback period. Most classes are probation-eligible, meaning a Will County judge can impose probation in place of prison if the offense and the defendant’s background allow. Class X is the exception: it carries mandatory prison time.
Each class also carries a period of Mandatory Supervised Release (MSR) — Illinois’ equivalent of parole — running one to three years after the prison term ends. With that framework in place, here are the five ranked from least to most serious.
Class 4 Felony — The Least Serious Felony Class in Illinois
A Class 4 felony carries a sentencing range of one to three years in prison, extended to three to six years if aggravating factors apply. Class 4 charges are probation-eligible, and probation outcomes are common for first-time Joliet defendants represented by experienced counsel.
Common Class 4 offenses include:
- Aggravated DUI in certain scenarios, such as driving on a revoked license while DUI
- Possession of small amounts of Schedule I or II controlled substances
- Theft of property valued between $500 and $10,000
- Aggravated assault under specific circumstances
- Criminal trespass to residence in specific scenarios — see our explainer on when trespassing is a felony in Illinois
A Joliet attorney handling a Class 4 felony will often focus on probation eligibility, mitigation, and reduction to a Class A misdemeanor where the statute and facts allow.
Class 3 Felony in Illinois
A Class 3 felony carries two to five years in prison, with an extended term of five to ten years. Class 3 charges remain probation-eligible.
Common Class 3 offenses:
- Aggravated battery in many configurations, including battery causing great bodily harm or involving a protected victim category
- Retail theft and theft above certain dollar thresholds
- Perjury
- Certain firearms offenses
- Aggravated DUI involving a third offense
A common Class 3 question is whether a battery charge is a felony or a misdemeanor — the answer often depends on the identity of the victim and the nature of the contact. Our post on whether Illinois domestic battery is a misdemeanor or felony walks through that distinction in detail.
For Will County defendants, Class 3 cases often turn on whether the aggravating elements actually apply or whether the underlying conduct should have been charged at a lower level.
Class 2 Felony in Illinois
A Class 2 felony carries three to seven years in prison, extended to seven to fourteen years. Probation is generally available, with some statutory exceptions.
Common Class 2 offenses:
- Burglary
- Robbery in some configurations
- Aggravated domestic battery
- Possession with intent to deliver moderate amounts of controlled substances
- Aggravated unlawful use of a weapon (AUUW) in certain scenarios — see our practice page on Illinois weapons, gun, and FOID charges
- Aggravated DUI involving a fourth offense, or with specific harm factors
Class 2 cases are where the stakes meaningfully escalate. For a Joliet defendant, the difference between probation and a four-year prison sentence often comes down to suppression motions, plea negotiation, and a strong mitigation case at sentencing.
Class 1 Felony in Illinois
A Class 1 felony carries four to fifteen years in prison, extended to fifteen to thirty years. Probation is available for most Class 1 offenses, though specific statutes — including certain second drug offenses — exclude it.
Common Class 1 offenses:
- Criminal sexual assault
- Residential burglary
- Possession with intent to deliver larger quantities of controlled substances
- Aggravated kidnapping in certain scenarios
- Certain home invasion configurations
At the Class 1 level, the prison range is wide enough that the difference between the low end and the high end can mean a decade of someone’s life. Defense work in Joliet focuses on pretrial motions — especially Miranda and Fourth Amendment suppression issues — trial strategy, and where appropriate, plea structure that brings the case into the probation-eligible range.
Class X Felony — The Most Serious Felony Class in Illinois
Class X is Illinois’ top felony class below first-degree murder. It carries six to thirty years in prison with no probation available. Many Class X offenses are subject to “truth in sentencing,” meaning the defendant must serve 85% (or in some cases 100%) of the imposed sentence — a sharp departure from the day-for-day credit available at lower classes. MSR following a Class X term is three years.
Common Class X offenses:
- Armed robbery
- Home invasion
- Aggravated criminal sexual assault
- Armed habitual criminal
- Class X aggravated DUI (offenses causing great bodily harm or death, particularly with a prior DUI history, can be charged at the Class X level) — see our page on aggravated and felony DUI defense
- Certain delivery and trafficking offenses involving larger drug quantities
Because probation is not available, a Class X conviction means prison. Joliet defense at this level targets the charge itself — whether the aggravating elements that elevated the offense actually apply, whether the evidence withstands suppression challenges, and whether a negotiated plea can bring the conviction down to a probation-eligible class. Of all the Illinois felony classes, Class X is where charging-document scrutiny matters most.
When a Felony Becomes “Aggravated” or Enhanced
A significant portion of Illinois felony law operates by elevation. The same underlying offense can be charged across multiple classes depending on aggravating factors — aggravated DUI, aggravated battery, and aggravated unlawful use of a weapon are three of the most common Joliet examples.
A few patterns drive elevation:
- Victim category — an offense against a peace officer, school employee on duty, person over 60, or minor often elevates the class.
- Use of a weapon — discharging or possessing a firearm during the offense typically pushes the charge up at least one class.
- Bodily harm — great bodily harm or permanent disability is a common aggravator across many Illinois statutes.
- Prior convictions — a prior of the same offense within a statutory lookback (often ten years) can elevate the class on a subsequent charge.
In practice this means the difference between a Class 4 and a Class X version of “the same” offense can come down to a single fact. Charging-document review is one of the first steps in any felony defense for that reason.
Defending an Illinois Felony Charge in Joliet
Attorney Jack Zaremba represents Will County clients in felony matters across all five classes. As a former Will County prosecutor and former Illinois Assistant Attorney General, he brings inside knowledge of how the State’s Attorney’s office evaluates felony cases — often the difference between an effective Joliet defense and a routine one.
Felony defense work in Joliet generally moves through several stages:
- Charging review — confirming whether the State has correctly assessed the class, whether aggravating elements actually apply, and whether the case has been overcharged.
- Suppression motions — Miranda violations, illegal searches, and Fourth Amendment issues are routinely the strongest defense tools.
- Plea negotiation — structuring a plea that reduces the class, brings the case into probation eligibility, or eliminates mandatory minimums.
- Mitigation and sentencing — assembling the personal, employment, and family-context evidence that influences a Will County judge’s sentencing decision.
- Trial — where the facts and law support it, taking the case to a Will County jury.
If the charge can be defeated on the law or the facts, that is the goal. Where it cannot, the goal becomes the lowest class and the best outcome the case allows — and for many clients, that conversation extends to long-term consequences and possible record sealing after the case closes. For more on the firm’s work across all Illinois felony classes, see our Joliet criminal defense practice.
Frequently Asked Questions About Illinois Felony Classes
What is the difference between a Class 1 and a Class X felony in Illinois?
A Class 1 felony in Illinois carries 4 to 15 years in prison and is generally probation-eligible, while a Class X felony carries 6 to 30 years with mandatory prison time and no probation available. Class X is the most serious felony class below first-degree murder, and many Class X offenses are subject to 85% truth-in-sentencing.
Can a felony charge be reduced to a misdemeanor in Illinois?
In some cases, yes. Reduction depends on the specific statute, the facts of the case, and the prosecution’s willingness to negotiate. Class 4 felonies — the lowest felony class — are sometimes reducible to a Class A misdemeanor through plea negotiation, particularly for first-time defendants. Higher-class felonies are less commonly reduced to misdemeanors, but reductions between felony classes are routinely negotiated.
Can you get a FOID card with a felony conviction in Illinois?
Generally, no. Illinois law disqualifies anyone convicted of a felony from obtaining a Firearm Owner’s Identification (FOID) card. Limited paths to relief exist through the Illinois State Police FOID Card Review Board or through record-clearing remedies, but they are not automatic and depend on the underlying offense.
How long does a felony stay on your record in Illinois?
A felony conviction remains on your Illinois criminal record permanently unless cleared through expungement or sealing. Most felony convictions cannot be expunged in Illinois, but many can be sealed under specific statutory criteria, which limits public access to the record while leaving it visible to law enforcement and certain employers.
Is shoplifting a felony in Illinois?
It depends on the value of the merchandise and the defendant’s prior record. Retail theft of merchandise valued under $300 from a single retail location is typically a Class A misdemeanor, while theft above that threshold, or a second retail theft offense, is generally charged as a felony.
Contact a Joliet Felony Defense Attorney
If you or a loved one is facing a felony charge in Joliet or anywhere in Will County, the time to bring in a defense attorney is now — before the State has finalized its position on charging and discovery. Call the Law Offices of Jack L. Zaremba at 815-740-4025 to discuss your case, or visit our contact page.