Statutory rape in Illinois is prosecuted under four separate offenses rather than a single crime by that name. The age of consent is 17, and any sexual activity with a person younger than that is criminal regardless of whether the minor agreed. What determines the charge, and whether it lands as a misdemeanor or a decades-long felony, is the victim’s age, the age gap between the two people, whether the act involved penetration, and whether the older person held a position of authority over the minor.
How the Charge Is Determined
Two variables drive everything. The first is how old the younger person was. The second is how many years separated the two parties. Layered on top are two aggravating factors: whether the sexual act involved penetration rather than only contact, and whether the older person held a position of trust, authority, or supervision over the minor, such as a teacher, coach, counselor, or clergy member.
A small age gap between teenagers results in a misdemeanor. A larger gap, a very young victim, or an authority relationship pushes the same conduct into felony territory with prison ranges measured in years or decades. The statute that applies also decides whether sex offender registration is required and for how long.
Criminal Sexual Abuse: Class A Misdemeanor
Under 720 ILCS 5/11-1.50, two situations fall into this least serious category. If both people are under 17 and the younger is at least 9, any sexual penetration or sexual conduct between them is a Class A misdemeanor. The same classification applies when the younger person is between 13 and 16 and the older person is less than five years older.1Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.50 – Criminal Sexual Abuse The penalty is up to 364 days in jail and a fine of up to $2,500.2Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-55 – Class A Misdemeanors; Sentence
This is the closest Illinois comes to a “Romeo and Juliet” law. The state does not make the conduct legal when the parties are close in age. It only reduces the offense from a felony to a misdemeanor. A 19-year-old and a 15-year-old are still committing a crime; the state simply treats it far less harshly than the same conduct by someone 25 years old.
Aggravated Criminal Sexual Abuse: Class 2 Felony
The charge jumps sharply under 720 ILCS 5/11-1.60 once the age gap widens or other aggravating facts appear. The most common age-based scenario: the younger person is between 13 and 16 and the older person is at least five years older.3Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.60 – Aggravated Criminal Sexual Abuse A Class 2 felony carries three to seven years in prison4Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-35 – Class 2 Felonies; Sentence and fines up to $25,000.5Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-50 – Fines
Other situations also fall under this statute:
- A person 17 or older engaging in sexual conduct with a child under 13.
- Sexual conduct with a victim under 18 by a family member.
- Sexual conduct with any minor using force or the threat of force.
- A person 17 or older who holds a position of trust, authority, or supervision over a victim under 18 and engages in sexual conduct (not penetration) with that victim.
All carry the same three-to-seven-year range.3Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.60 – Aggravated Criminal Sexual Abuse
Criminal Sexual Assault: Class 1 Felony
When the conduct involves penetration rather than only contact, and the older person is in a position of authority, Illinois charges the offense as criminal sexual assault under 720 ILCS 5/11-1.20. A person 17 or older who holds a position of trust, authority, or supervision over the victim and commits sexual penetration with a victim between 13 and 18 commits a Class 1 felony.6Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.20 – Criminal Sexual Assault The prison range is four to 15 years, with an extended term of 15 to 30 years. A second conviction under this provision becomes a Class X felony.
Predatory Criminal Sexual Assault of a Child
The most serious charge applies when a person 17 or older engages in sexual penetration or sexual contact with a child under 13. Under 720 ILCS 5/11-1.40, this is a Class X felony carrying six to 60 years in prison.7Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.40 – Predatory Criminal Sexual Assault of a Child Penalties climb further if a weapon is used or if the victim suffers permanent disability or a life-threatening injury.
What Defenses Are Available
Illinois lists the available defenses in 720 ILCS 5/11-1.70, and there are fewer than most people assume.
Reasonable Belief the Minor Was 17 or Older
For some offenses, the defendant can argue they reasonably believed the younger person was 17 or older. This defense applies to criminal sexual abuse under subsections (b) and (c) of Section 11-1.50 and to the age-gap provision of aggravated criminal sexual abuse under subsection (d) of Section 11-1.60.8Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.70 – Defenses With Respect to Offenses Described in Sections 11-1.20 Through 11-1.60 The defendant carries the burden of showing the belief was genuinely reasonable. A fake ID or an adults-only setting can support it. Saying “she told me she was 18” typically will not.
The defense is not available for offenses involving victims under 13 or for charges based on a position of trust or authority. Those are strict liability as to the victim’s age.
Consent
Consent is a defense only where force or threat of force is an element of the offense.8Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.70 – Defenses With Respect to Offenses Described in Sections 11-1.20 Through 11-1.60 For age-based offenses, consent is irrelevant. The premise of these statutes is that a person under 17 cannot legally consent, so a willing minor does not create a defense at trial.
Challenging the State’s Evidence
Outside the statutory defenses, a defendant can challenge whether the prosecution has met its burden of proof. That may mean questioning witness reliability, pointing out inconsistencies in the accuser’s account, or contesting physical or digital evidence. These are ordinary criminal defense strategies, and they are often the only avenue when the statutory defenses do not apply.
Statute of Limitations
Illinois has eliminated the statute of limitations for felony criminal sexual assault and sexual abuse offenses involving minors. Prosecutors can bring felony charges years or decades after the conduct, provided the prior limitations period had not already expired when the change took effect. Misdemeanor criminal sexual abuse under Section 11-1.50 remains subject to the standard misdemeanor period, generally 18 months.
Sex Offender Registration
A conviction for any of these offenses triggers registration under the Illinois Sex Offender Registration Act (730 ILCS 150). Registration must happen in person within three days of sentencing if the person is not incarcerated, or within three days of release from prison, parole, or discharge.9Illinois General Assembly. Illinois Code 730 ILCS 150/3 – Duty to Register Registrants provide a photograph, home address, employer information, phone numbers, email addresses, social media identities, and all internet accounts. Any change to that information must be reported within three days.
The default registration period is 10 years from the date of conviction, or from release if the person was incarcerated. Lifetime registration applies to anyone classified as a sexual predator or sexually violent person, anyone previously subject to registration who commits a new qualifying offense, and anyone adjudicated sexually dangerous.10Justia Law. Illinois Code 730 ILCS 150 – Sex Offender Registration Act
Failing to register, missing an update, or supplying false information is a separate criminal offense. The registry is publicly searchable through the Illinois State Police, so neighbors, employers, and landlords can look up a registrant’s status. Employment restrictions, housing limits near schools and parks, and barriers to professional licensing follow from that public listing. Many of these consequences are not part of the criminal sentence itself but come from other state statutes, local ordinances, and the practical effects of the public entry.
Federal Exposure When State Lines Are Crossed
Conduct that crosses state lines opens a separate layer of federal liability that state law alone does not address. Under 18 U.S.C. ยง 2423, knowingly transporting a person under 18 across state lines with the intent that they engage in sexual activity that would be criminal under any state’s law is a federal felony carrying a mandatory minimum of 10 years and a maximum of life.11Office of the Law Revision Counsel. United States Code Title 18 Section 2423 – Transportation of Minors The sexual conduct itself does not need to occur; proof of the illegal purpose of the travel is enough. Traveling across state lines or internationally with intent to engage in illegal sexual conduct with a minor carries up to 30 years, as does arranging or facilitating such travel for commercial gain. There is no federal statute of limitations for child sexual abuse crimes.