Illinois Self-Defense Law:
Castle Doctrine and Use of Force

Illinois self-defense law is codified in Article 7 of the Criminal Code (720 ILCS 5/7-1 through 7-4). These provisions establish when a person may use force, including deadly force, to defend themselves, their home, or other people. Illinois defines its self-defense framework through a combination of statutory text and case law interpretation. Understanding these provisions is essential for any Illinois firearm owner who may need to use force in a defensive situation.^[1]

Use of Force in Defense of Person (720 ILCS 5/7-1)

Section 7-1 establishes the foundational standard for self-defense in Illinois. A person is justified in using force against another "when and to the extent that he reasonably believes that such conduct is necessary to defend himself or another against such other's imminent use of unlawful force."^[1] Section 7-1 requires a reasonable belief that force is necessary to defend against imminent unlawful force.

• Reasonable belief The person's sincere belief that force was necessary must also be objectively reasonable. Courts evaluate reasonableness based on what a hypothetical reasonable person would have believed under the same circumstances.
• Necessity A person may use force only when and to the extent that they reasonably believe it is necessary to defend themselves or another against the imminent use of unlawful force.
• Imminence: The threat must be immediate. A person cannot use force in response to a past attack or a speculative future threat.

When Deadly Force Is Permitted

Section 7-1 limits the use of deadly force to situations where the person reasonably believes it is necessary to prevent imminent death or great bodily harm to themselves or another person, or to prevent the commission of a forcible felony. Section 7-1 does not contain a standalone definition of "deadly force." Its rule covers force which is intended or likely to cause death or great bodily harm.^[1]

"Forcible felony" is defined in 720 ILCS 5/2-8 to include first degree murder, second degree murder, predatory criminal sexual assault of a child, robbery, burglary, residential burglary, aggravated arson, kidnapping, aggravated battery resulting in great bodily harm, and any other felony involving the use or threat of physical force against an individual.^[1]

Castle Doctrine: Defense of Dwelling (720 ILCS 5/7-2)

Section 7-2 governs the use of force to defend a dwelling. The statute provides that a person is justified in using force against another "when and to the extent that he reasonably believes that such conduct is necessary to prevent or terminate such other's unlawful entry into or attack upon a dwelling."^[2]

The Castle Doctrine provides heightened protections for individuals defending their homes. Key provisions include:

• No duty to retreat: Under instruction 24-25.09X, a person attacked in their own home who has not initially provoked the use of force against themselves has no duty to attempt to escape the danger before using force against the aggressor, including deadly force when the statutory conditions are met
• Deadly force threshold Force intended or likely to cause death or great bodily harm is justified only if the entry is made or attempted in a violent, riotous, or tumultuous manner and the person reasonably believes such force is necessary to prevent an assault upon, or offer of personal violence to, themselves or another then in the dwelling, or if the person reasonably believes such force is necessary to prevent the commission of a felony in the dwelling (720 ILCS 5/7-2(a))
• Scope of "dwelling" Under 720 ILCS 5/2-6(a), a dwelling means a building or portion thereof, a tent, a vehicle, or other enclosed space used or intended for use as a human habitation, home or residence

Section 7-2 justifies a homeowner shooting an intruder to prevent or terminate unlawful entry into or attack upon a dwelling only if the entry is made or attempted in a violent, riotous, or tumultuous manner and the homeowner reasonably believes such force is necessary to prevent an assault upon, or offer of personal violence to, themselves or another then in the dwelling, or the homeowner reasonably believes such force is necessary to prevent the commission of a felony in the dwelling.^[2]

Duty to Retreat Outside the Home

Sections 7-1 and 7-2 do not state a duty to retreat. Illinois Pattern Jury Instruction 24-25.09X states that a person who has not initially provoked the use of force against themselves has no duty to attempt to escape the danger before using force against the aggressor, without limiting that rule to the home. This position has been affirmed through case law rather than through explicit statutory text.^[3]

For a person who has not initially provoked the use of force, the jury instruction states that there is no duty to attempt to escape the danger before using force against the aggressor.

Defense of Other Property (720 ILCS 5/7-3)

Section 7-3 allows a person to use force when and to the extent that they reasonably believe it is necessary to prevent or terminate another person's trespass on or other tortious or criminal interference with real property other than a dwelling, or personal property, lawfully in their possession or in the possession of a member of their immediate family or household or of a person whose property they have a legal duty to protect. However, this provision explicitly limits the use of deadly force. Under Section 7-3, force intended or likely to cause death or great bodily harm is justified only if the person reasonably believes it is necessary to prevent the commission of a forcible felony.^[1]