Sexual Assault Charges in Illinois: Penalties, Registration, and Consent

Sexual assault charges and penalties in Illinois break down into four felony offenses—criminal sexual assault, aggravated criminal sexual assault, predatory criminal sexual assault of a child, and criminal sexual abuse (with an aggravated version)—and the prison time depends heavily on whether the act involved penetration, whether a weapon was used, the age of the victim, and the defendant’s prior record. Sentences run from a Class A misdemeanor for certain conduct between minors to mandatory natural life for the worst offenses. Nearly every conviction also triggers sex offender registration and a period of supervised release after prison.

Criminal Sexual Assault

Criminal sexual assault is the baseline felony sex offense. It requires an act of sexual penetration together with one of these circumstances:

Use or threat of force;
Knowledge that the victim cannot understand the act or give knowing consent;
The offender is a family member of a victim under 18; or
The offender is 17 or older and holds a position of trust, authority, or supervision over a victim at least 13 but under 18.

The offense is a Class 1 felony carrying 4 to 15 years in prison.¹ With statutory aggravating factors at sentencing, a judge can impose an extended term of 15 to 30 years.²

Prior convictions raise the stakes sharply. A second conviction for criminal sexual assault committed by force or against someone unable to consent becomes a Class X felony carrying 30 to 60 years. A defendant convicted of criminal sexual assault who has a prior conviction for aggravated criminal sexual assault or predatory criminal sexual assault of a child is sentenced to natural life.¹

Aggravated Criminal Sexual Assault

A criminal sexual assault becomes aggravated when the conduct or the victim triggers a statutory factor. Those factors include:

Displaying, threatening to use, or using a dangerous weapon or firearm;
Causing bodily harm;
Acting in a way that endangers the life of the victim or another person;
Committing the assault during another felony;
A victim who is 60 or older or who has a physical disability or severe intellectual disability; or
Giving the victim a controlled substance without consent.

Aggravated criminal sexual assault is a Class X felony. The base sentencing range is 6 to 30 years, with an extended term of 30 to 60 years available when aggravating factors are found at sentencing.³

Firearm involvement triggers mandatory add-on time stacked on top of the base sentence. Using a dangerous weapon adds 10 years. Being armed with a firearm adds 15 years. Discharging a firearm during the assault adds 20 years. Discharging a firearm that causes great bodily harm, permanent disability, permanent disfigurement, or death adds 25 years to natural life.⁴

Predatory Criminal Sexual Assault of a Child

This is the most severely punished sex offense in the Illinois code. It applies when someone 17 or older commits an act of sexual penetration, or sexual contact involving the sex organ or anus, with a child under 13. The base offense is a Class X felony carrying 6 to 60 years.⁵

From there, the sentence escalates with the circumstances:

Armed with a firearm: 15 years added.
Discharge of a firearm: 20 years added.
Great bodily harm resulting in permanent disability or a life-threatening injury: minimum 50 years, up to natural life.
Drugging the child with a controlled substance: 50 to 60 years, mandatory.
Two or more victims: natural life, automatic, whether or not the acts were related.⁵

Criminal Sexual Abuse and Aggravated Criminal Sexual Abuse

The line between assault and abuse in Illinois turns on the type of contact. Assault charges require sexual penetration. Abuse charges cover sexual conduct that falls short of penetration.

Criminal Sexual Abuse

Criminal sexual abuse covers sexual conduct (not penetration) committed through force or threat of force, or when the offender knows the victim cannot understand the act or give knowing consent. In its force-based form, it is a Class 4 felony. A second or subsequent conviction becomes a Class 2 felony.⁶

The statute treats sexual conduct between minors more leniently. When someone under 17 engages in sexual penetration or sexual conduct with a person at least 9 but under 17, or when the offender is less than five years older than a victim at least 13 but under 17, the charge is a Class A misdemeanor rather than a felony.⁶

Aggravated Criminal Sexual Abuse

Aggravated criminal sexual abuse applies when sexual conduct is combined with one of the aggravators that would elevate an assault charge (weapon, bodily harm, life-threatening conduct, drugging the victim), or with specific victim relationships: someone 17 or older engaging in sexual conduct with a child under 13, a family member engaging in sexual conduct with a victim under 18, or an offender in a position of trust engaging in sexual conduct with a victim between 13 and 18. It is generally a Class 2 felony, which carries 3 to 7 years.⁷⁸

Sex Offender Registration

A conviction for a qualifying sex offense requires registration with the Illinois State Police sex offender database.⁹ The default term is 10 years, measured from release from prison or, if no prison sentence was served, from the date of conviction. Lifetime registration applies to anyone classified as a sexually violent person or a sexual predator, anyone previously subject to registration who becomes subject again, and anyone adjudicated sexually dangerous. Failing to comply with registration requirements tacks another 10 years onto whatever period remains.¹⁰

Federal law permanently bars anyone subject to lifetime sex offender registration from federally assisted housing, including public housing and Section 8.¹¹ Registrants also face state restrictions on where they can live, work, and travel throughout the registration period.

Supervised Release and Electronic Monitoring

A prison sentence for a sex offense is followed by mandatory supervised release. Offenders who qualify as sexual predators must wear an electronic monitoring device for the entire supervised release term. If the victim was under 18 and force was used, the device must have GPS tracking.¹²

Violations can send a person back to prison for up to two years, and the supervised release clock stops running during any reincarceration, so that time does not count toward completing the release term.

No Statute of Limitations

Illinois has removed the filing deadline for its most serious sex offenses. Criminal sexual assault, aggravated criminal sexual assault, and aggravated criminal sexual abuse can be charged at any time. When the victim was under 18, predatory criminal sexual assault of a child and felony criminal sexual abuse also have no limitations period. Submitting to a sexual assault evidence collection kit counts as reporting the offense for statute-of-limitations purposes.¹³

How Illinois Defines Consent

Consent under Illinois law is a freely given agreement to the specific sexual act. Lack of physical resistance does not equal consent, especially where force or threats are involved, and the victim’s clothing is legally irrelevant. Consent given at the start of a sexual encounter can be withdrawn, and continuing after withdrawal is a criminal act.¹⁴

The age of consent is 17. A person under 17 cannot legally consent. A defendant facing a criminal sexual assault charge may raise the defense that they reasonably believed the other person was 17 or older.

1
Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.20 – Criminal Sexual Assault
2
FindLaw. Illinois Code 730 ILCS 5/5-4.5-30 – Class 1 Felonies
3
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-25 – Class X Felonies
4
Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.30 – Aggravated Criminal Sexual Assault
5
Justia Law. Illinois Code 720 ILCS 5/11-1.40 – Predatory Criminal Sexual Assault of a Child
6
FindLaw. Illinois Code 720 ILCS 5/11-1.50 – Criminal Sexual Abuse
7
Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.60 – Aggravated Criminal Sexual Abuse
8
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-35 – Class 2 Felonies
9
Illinois State Police Offender Registry. Illinois State Police Offender Registry
10
Justia Law. Illinois Code 730 ILCS 150/7 – Duration of Registration
11
Office of the Law Revision Counsel. 42 USC 13663 – Ineligibility of Dangerous Sex Offenders for Admission to Public Housing
12
FindLaw. Illinois Code 730 ILCS 5/3-14-2.5 – Extended Supervision of Sex Offenders
13
Illinois General Assembly. Illinois Code 720 ILCS 5/3-6 – Extended Limitations
14
Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.70 – Consent