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Justifiable Use of Force in Illinois: When Is Self-Defense Legal?
Last Reviewed & Updated: October 18, 2026
By: W. Scott Hanken | Former Sangamon County Prosecutor | Springfield Criminal Defense & Violent Crimes Defense Attorney | Voted “Best Attorney” — Illinois Times Best of Springfield & State Journal-Register Reader’s Choice | Springfield, IL | Sangamon County | (217) 544-4057 | hankenlaw.com
Direct Answer: In Illinois, you may use force against another person when, and only to the extent that, you reasonably believe it is necessary to defend yourself or someone else against that person’s imminent use of unlawful force. Deadly force is justified only if you reasonably believe it is necessary to prevent imminent death or great bodily harm, or to prevent the commission of a forcible felony. That rule comes from 720 ILCS 5/7-1, and it is the starting point for every self-defense case in Sangamon County.
People claim “self-defense” so often that many assume anyone can raise it. You can’t. Illinois spells out exactly when force is justified in Article 7 of the Criminal Code. Who started the confrontation, how imminent the threat was, how much force was used, and where it happened often decide whether a case ends in an acquittal or a conviction.
Three Situations Illinois Law Treats Differently
Article 7 separates defense of a person, defense of a dwelling, and defense of other property. Each one sets its own threshold for deadly force.
| Situation | Statute | Non-deadly force is justified when you reasonably believe it is necessary to… | Deadly force is justified only when… |
|---|---|---|---|
| Defending yourself or another person | 720 ILCS 5/7-1 | Defend against another’s imminent use of unlawful force | You reasonably believe it is necessary to prevent imminent death or great bodily harm, or a forcible felony |
| Defending your home | 720 ILCS 5/7-2 | Prevent or end someone’s unlawful entry into, or attack on, a dwelling | The entry is violent, riotous, or tumultuous and you reasonably believe force is needed to prevent an assault on someone inside, or you reasonably believe it is needed to prevent a felony in the dwelling |
| Defending other property | 720 ILCS 5/7-3 | Prevent or end a trespass on, or interference with, property (other than a dwelling) lawfully in your possession, your family’s or household’s possession, or the possession of someone whose property you have a legal duty to protect | You reasonably believe it is necessary to prevent a forcible felony |
Key point: In every row, the statute measures your conduct by what you reasonably believed when you acted.
The Six Elements of a Self-Defense Claim
Illinois courts break Section 7-1 into six elements. Under People v. Lee, 213 Ill. 2d 218 (2004), there must be evidence that:
- Unlawful force was threatened against a person.
- The person threatened was not the aggressor.
- The danger of harm was imminent.
- The use of force was necessary.
- The person threatened actually and subjectively believed a danger existed that required the force used.
- That belief was objectively reasonable.
Who Has to Prove Self-Defense?
Self-defense is an affirmative defense under 720 ILCS 5/7-14. That means some evidence of it has to come into the case, either from the defense or from the State’s own evidence. Once the issue is raised, the State must prove beyond a reasonable doubt that you did not act in self-defense, along with every element of the charged offense (720 ILCS 5/3-2(b)). The catch is that the State only has to disprove one of the six elements for the defense to fail.
What Counts as a “Forcible Felony”?
Under 720 ILCS 5/2-8, forcible felonies include:
- Treason
- First and second degree murder
- Predatory criminal sexual assault of a child, aggravated criminal sexual assault, and criminal sexual assault
- Robbery, burglary, and residential burglary
- Aggravated arson and arson
- Aggravated kidnapping and kidnapping
- Aggravated battery resulting in great bodily harm or permanent disability or disfigurement
- Any other felony involving the use or threat of physical force or violence against any individual
Defending Your Home: Illinois’s Version of the Castle Doctrine
Illinois has no statute called the “Castle Doctrine.” When people use that phrase, they mean Section 7-2.
Inside your home, you may use force when you reasonably believe it is necessary to prevent or end someone’s unlawful entry or attack. Force intended or likely to cause death or great bodily harm is justified in only two situations:
- Violent entry. The entry is made or attempted in a violent, riotous, or tumultuous manner, and you reasonably believe the force is necessary to prevent an assault on, or an offer of personal violence to, you or another person in the home.
- Felony in the home. You reasonably believe the force is necessary to prevent the commission of a felony in the dwelling.
Notice that the second prong refers to “a felony,” not a “forcible felony.” Either way, the reasonableness requirement still applies.
What About Property Outside the Home?
Your yard, a detached shed, a phone, or a wallet falls under Section 7-3. You may use reasonable force to stop a theft or a trespass. Property alone, however, never justifies deadly force. Only preventing a forcible felony does.
Does Illinois Have a Duty to Retreat?
None of the Article 7 statutes mentions retreat. Illinois’s pattern jury instruction, IPI Criminal 24-25.09X, tells jurors that a person who did not initially provoke the use of force has no duty to try to escape the danger before using force against the aggressor.
Whether a jury hears that instruction depends on the evidence. In People v. Sloan, 2024 IL 129676, the Illinois Supreme Court upheld a trial judge’s refusal to give it, holding that the instruction wasn’t proper on the facts of that case.
Lawmakers have repeatedly filed bills to put “no duty to retreat” into the statute and to turn justification into immunity from prosecution. The current version, House Bill 1032, has been in the House Rules Committee since January 2025 as of this writing.
For someone who started the confrontation, the rules change.
When Self-Defense Is Off the Table: The Aggressor Rule
Under 720 ILCS 5/7-4, justification is not available to a person who:
- Is attempting to commit, committing, or escaping after committing a forcible felony.
- Initially provokes force against himself intending to use it as an excuse to inflict bodily harm on the other person.
- Otherwise initially provokes force against himself, unless one of two exceptions applies:
- The force against him is so great that he reasonably believes he is in imminent danger of death or great bodily harm, and he has exhausted every reasonable means of escape other than deadly force.
- He withdraws from physical contact in good faith, clearly signals that he wants to stop, and the other person continues or resumes the use of force.
Honest but Unreasonable Belief: Second Degree Murder
In a homicide case, a defendant may have honestly believed that deadly force was justified while that belief was unreasonable. In that situation, 720 ILCS 5/9-2(a)(2) reduces the offense from first degree murder to second degree murder, a Class 1 felony.
The burdens split. The defendant must prove the mitigating factor by a preponderance of the evidence. The State must still prove the elements of first degree murder beyond a reasonable doubt, and, when the issue is raised, that the killing was not justified. Section 9-2 applies only to homicide charges.
Civil Lawsuits After a Justified Use of Force
Sections 7-1, 7-2, and 7-3 each contain a subsection (b) addressing civil claims. When force is justified, the aggressor cannot sue the person who used it. Neither can the aggressor’s estate, spouse, or family members. The one exception is force involving willful or wanton misconduct.
This protection is narrow. It covers claims by aggressors only, and only when the force was justified. It is not blanket immunity from civil suits.
Justified Force Is a Defense, Not Immunity From Arrest
Illinois treats justification as an affirmative defense rather than immunity. Even when you believe your actions were justified, police can still arrest you and the State’s Attorney can still file charges. The question is then resolved through the charging decision, negotiation, or trial.
What happens in the first hours matters. Call 911, get help for anyone injured, and ask to speak with a lawyer before giving a detailed statement. Also keep in mind that whether your use of force was justified and whether you lawfully possessed a weapon are separate legal questions.
Bottom Line: A self-defense claim is won or lost on the details: who started it, what you reasonably believed, how much force you used, and where it happened. As a former Sangamon County prosecutor, Scott Hanken knows how the State evaluates these cases and where a self-defense claim is most likely to be challenged.
Frequently Asked Questions (FAQs)
Not by statute. No Illinois statute uses that label, and Article 7 does not mention retreat. However, the state’s pattern jury instruction provides that a person who did not start the confrontation has no duty to try to escape before using force. Courts give that instruction when the evidence supports it.
Outside your home, only to prevent a forcible felony (Section 7-3). Inside your home, Section 7-2 governs. It allows deadly force against a violent entry when you reasonably believe it is necessary to prevent an assault on someone inside, or when you reasonably believe it is necessary to prevent a felony in the dwelling.
Yes. Section 7-1 covers defending “himself or another,” and Section 7-2 covers anyone then in the dwelling. The same reasonable-belief test applies.
Only to the point of putting some evidence of it into the case. After that, the State must prove beyond a reasonable doubt that you were not acting in self-defense. The State wins on this issue if it disproves any one of the six elements.
Generally, no. An initial aggressor regains the right to self-defense only in two situations. The first is when he faces force so great that he reasonably fears imminent death or great bodily harm and has exhausted every reasonable means of escape. The second is when he withdraws in good faith, clearly signals that he wants to stop, and the other person keeps going.
Not if your force was justified and that person was the aggressor, unless your conduct was willful or wanton.
The statute turns on reasonable belief. A reasonable belief can still justify force even if it later proves mistaken. An unreasonable belief generally defeats the defense. In a homicide case, an honest but unreasonable belief can reduce first degree murder to second degree murder.
Further Reading
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Related Articles
- When Is Self-Defense a Legitimate Defense to Battery Charges? — Read this if your charge is battery rather than a homicide and you want to see the six elements applied.
- Can You Use a Weapon in Self-Defense? — Read this if a gun or knife was involved, since this article sets those questions aside.
- Murder vs. Manslaughter in Illinois: What the Charges Really Mean — Read this to see where second degree murder sits among Illinois homicide charges and what each carries.
- The Difference Between Assault and Battery in Illinois — Read this to pin down exactly what you’re charged with before weighing a self-defense claim.
- 4 Ways to Boost a Defense Against Aggravated Battery Charges — Read this for other defense angles that work alongside self-defense, or in place of it.
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About the Author: W. Scott Hanken, Attorney at Law
Scott Hanken is a Springfield, Illinois criminal defense attorney with over 37 years of experience, including service as a former Sangamon County prosecutor. He has been voted Best Attorney by the Illinois Times and State Journal-Register, holds an Avvo 10.0 “Superb” rating, and has earned over 270 five-star Google reviews. He serves clients throughout Sangamon County and Central Illinois.
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This article is for general educational purposes only and does not constitute legal advice. Every case is unique — contact an experienced Springfield criminal defense attorney for guidance on your specific situation.
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