Illinois Criminal Code: Offenses, Penalties, and Sentencing

The Illinois criminal code, formally the Criminal Code of 2012 at 720 ILCS 5, defines what conduct is criminal in the state and what mental state prosecutors have to prove.¹ A separate statute, the Unified Code of Corrections at 730 ILCS 5, sets the penalties. Together they sort every offense onto a ladder: three misdemeanor classes topping out at 364 days in county jail, and five felony classes running up to 30 years in state prison, or 60 on an extended term. Where a charge lands on that ladder controls the prison range, the fine cap, whether probation is possible, and how long a person stays on supervision after release.

How Illinois Classifies Crimes

A felony in Illinois is any offense punishable by a year or more in a state penitentiary.² A misdemeanor is any offense punishable by less than a year in a county jail.³

Felonies split into five classes, most serious first:

Misdemeanors run in three classes. Class A carries up to 364 days in county jail.⁸ Class B allows up to six months, Class C up to 30 days.

Mental States the Prosecution Must Prove

With limited strict-liability exceptions, prosecutors have to prove a specific mental state for every element of a charged offense.⁹ The code recognizes four, from most to least culpable:

Intent: the person’s conscious goal was to perform the act or bring about the result.
Knowledge: the person was aware their conduct was practically certain to cause a specific outcome.
Recklessness: the person consciously disregarded a substantial, unjustifiable risk of harm.
Negligence: the person failed to notice a substantial risk any reasonable person would have recognized.

When a statute is silent on which state applies, proof of intent, knowledge, or recklessness satisfies the burden; negligence alone does not unless the statute expressly calls for it. The difference is not academic. Whether an act was reckless or intentional can be the line between a misdemeanor and a felony, or between second-degree and first-degree murder.

Offenses Against Persons

Homicide

First-degree murder is the code’s most severely punished offense. A person commits it by killing someone without lawful justification while intending to kill or cause great bodily harm, knowing the act creates a strong probability of death, or killing during the commission of a forcible felony.¹⁰ That last category is Illinois’s felony murder rule, and it can apply even where the defendant did not personally cause the death.

Second-degree murder involves the same underlying killing with a recognized mitigating factor: sudden and intense passion from serious provocation, or a genuine but unreasonable belief that the killing was justified.¹¹ It is a Class 1 felony carrying 4 to 20 years, and the defendant must prove the mitigating factor by a preponderance of the evidence.⁵

Assault and Battery

These are separate offenses. Assault does not require physical contact. A person commits assault by knowingly engaging in conduct that puts another in reasonable fear of being battered.¹² Battery does require contact: knowingly causing bodily harm, or making physical contact that is insulting or provoking.¹³ Basic versions are Class A misdemeanors. Aggravated versions with felony penalties apply when the victim is a police officer, a weapon is used, or the injury is severe.

Kidnapping

Kidnapping is knowingly confining someone against their will, using force or threats to move them with intent to secretly confine, or luring them by deception with that same intent.¹⁴ It is a Class 2 felony, and jumps to Class X when the defendant inflicts great bodily harm, commits a sex offense during the confinement, or demands ransom.

Offenses Against Property

Theft and Dollar Thresholds

Theft is knowingly taking or exercising unauthorized control over another person’s property with intent to permanently deprive the owner of it, or obtaining property by deception or threats.¹⁵ The dollar value of the property controls the class:

$500 or less (not from a person): Class A misdemeanor
$500 or less from a person, or $500 to $10,000: Class 3 felony
$10,000 to $100,000: Class 2 felony
$100,000 to $1,000,000: Class 1 felony
Over $1,000,000: Class X felony

A prior theft, burglary, robbery, or related conviction bumps a $500-or-less theft from a Class A misdemeanor to a Class 4 felony.¹⁵ Theft from a school, place of worship, or of government property also moves the charge up one felony class.

Robbery and Burglary

Robbery is theft with a personal confrontation: knowingly taking property from another or from their immediate presence by force or the threat of force.¹⁶ It is a Class 2 felony. Armed robbery, involving a firearm or dangerous weapon, is a Class X felony with a 6-year minimum.

Burglary needs no victim on the premises. It is knowingly entering or remaining in a building, vehicle, watercraft, or other enclosed structure without authority and with intent to commit a felony or theft inside.¹⁷ Standard burglary is Class 2. Residential burglary, involving an inhabited dwelling, is Class 1.

Arson and Criminal Damage

Arson is knowingly using fire or explosives to damage another’s real property, or personal property worth $150 or more, without consent; it also covers setting fires to defraud an insurer.¹⁸ Standard arson is a Class 2 felony; residential arson and place-of-worship arson are Class 1.

Criminal damage to property is broader and does not require fire. It covers knowingly damaging another person’s property, injuring their domestic animals, or depositing a stink bomb on their land to interfere with its use.¹⁹ The class depends on the dollar amount of the damage, starting at Class A misdemeanor and climbing into felony territory as the figure rises.

Drug Offenses

Controlled substances sit under a separate statute in the same chapter, the Illinois Controlled Substances Act at 720 ILCS 570. Penalties climb with weight. Simple possession of most controlled substances at lower amounts is a Class 4 felony. For heroin, cocaine, and morphine, possession of 15 grams or more triggers Class 1 sentencing of 4 to 15 years, with mandatory minimums rising from there: 6 years at 100 grams, 8 years at 400 grams, and 10 years at 900 grams, with a 50-year ceiling.²⁰

Delivery and manufacturing fall under Section 401 of the same act, generally with higher minimums than possession at the same weight. Cannabis has its own statute at 720 ILCS 550. Illinois legalized adult recreational cannabis in 2020, but possession above the legal limit and unlicensed sales remain criminal.

Weapons and Obstruction

Article 24 covers weapons offenses, from switchblades and metal knuckles to short-barreled rifles and machine guns.²¹ Carrying a concealed firearm without a valid Concealed Carry License is prosecuted here too. Most basic weapons violations are Class A misdemeanors; possessing a machine gun, sawed-off shotgun, or silencer is a Class 2 or Class 3 felony depending on the item.

Resisting arrest or obstructing a peace officer, firefighter, or correctional employee in the performance of their duties is a Class A misdemeanor, provided the person knew who they were dealing with.²² Aggravated obstruction, which causes bodily harm to the officer, is a Class 4 felony.

Self-Defense and Justifiable Force

Article 7 recognizes the right to use force. A person is justified in using force when they reasonably believe it is necessary to defend themselves or another against imminent unlawful force.²³ Deadly force is justified only where the person reasonably believes it is necessary to prevent imminent death, great bodily harm, or the commission of a forcible felony.

Illinois has no “stand your ground” statute, and it imposes no blanket duty to retreat either. Courts assess whether the response was reasonable under the circumstances.

Fines, Probation, and Supervised Release

Fines

Fines come on top of any imprisonment or probation. Felony fines cap at $25,000 per offense, or $50,000 if the defendant is a corporation, unless the specific offense statute sets a higher figure.²⁴ Class A misdemeanor fines cap at $2,500 per offense.⁸ Class B and C misdemeanor fines cap at $1,500. A court can reduce or waive a fine if it would burden the victim of the offense.

Probation

Not every conviction ends in prison. Most felony classes other than Class X are probation-eligible, as are misdemeanors generally. Probation runs up to four years for felonies and up to two years for misdemeanors, though certain offenses carry longer terms. Class X felonies are not eligible and carry mandatory prison time. Violating probation conditions can lead to revocation and resentencing to the full prison term for the underlying offense.

Mandatory Supervised Release

Illinois does not use traditional parole for most offenses. Every felony prison sentence is followed by a period of mandatory supervised release, built into the sentence from the start. Class 2 felonies carry two years.⁶ Class X and Class 1 felonies carry three years. Class 3 and Class 4 carry one year. Certain sex offenses require lifetime supervised release. Violating conditions can send the person back to prison for the remaining term.

Extended-Term Sentencing

The standard prison ranges are not the ceiling. A court may impose an extended term where the offense involved exceptionally brutal or heinous behavior, where the defendant has a qualifying prior conviction, or where another statutory trigger is present. An extended term roughly doubles the upper end of the standard range: a Class X felony that caps at 30 years reaches 60 on an extended term.⁴⁵⁶

1
Illinois General Assembly. Illinois Code 720 ILCS 5 – Criminal Code of 2012
2
Illinois General Assembly. Illinois Code 720 ILCS 5/2-7 – Felony
3
FindLaw. Illinois Code 720 ILCS 5/2-11 – Misdemeanor
4
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-25 – Class X Felonies Sentence
5
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-30 – Class 1 Felonies Sentence
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Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-35 – Class 2 Felonies Sentence
7
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-40 – Class 3 Felonies Sentence
8
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-55 – Class A Misdemeanors Sentence
9
Illinois General Assembly. Illinois Code 720 ILCS 5 – Criminal Code of 2012 – Section: Article 4 Criminal Act and Mental State
10
Illinois General Assembly. Illinois Code 720 ILCS 5/9-1 – First Degree Murder
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Illinois General Assembly. Illinois Code 720 ILCS 5/9-2 – Second Degree Murder
12
Illinois General Assembly. Illinois Code 720 ILCS 5/12-1 – Assault
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Illinois General Assembly. Illinois Code 720 ILCS 5/12-3 – Battery
14
FindLaw. Illinois Code 720 ILCS 5/10-1 – Kidnapping
15
Illinois General Assembly. Illinois Code 720 ILCS 5/16-1 – Theft
16
Illinois General Assembly. Illinois Code 720 ILCS 5/18-1 – Robbery
17
Illinois General Assembly. Illinois Code 720 ILCS 5/19-1 – Burglary
18
Illinois General Assembly. Illinois Code 720 ILCS 5/20-1 – Arson, Residential Arson, Place of Worship Arson
19
Illinois General Assembly. Illinois Code 720 ILCS 5/21-1 – Criminal Damage to Property
20
Illinois General Assembly. Illinois Code 720 ILCS 570/402 – Penalties for Possession of Controlled Substances
21
FindLaw. Illinois Code 720 ILCS 5/24-1 – Unlawful Possession of Weapons
22
FindLaw. Illinois Code 720 ILCS 5/31-1 – Resisting or Obstructing a Peace Officer, Firefighter, or Correctional Institution Employee
23
Illinois General Assembly. Illinois Code 720 ILCS 5/7-1 – Use of Force in Defense of Person
24
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-50 – General Recidivism Provisions and Fines