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What Is Aggravated Criminal Sexual Assault in Illinois?

What Is Aggravated Criminal Sexual Assault in Illinois?
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Last Modified on Mar 16, 2026

If you or a loved one is facing sex crime charges, you may ask, “What is aggravated criminal sexual assault in Illinois?” Aggravated criminal sexual assault is one of the most severe forms of sexual offense charges in Illinois. It applies when alleged sexual penetration is accompanied by certain statutory aggravating factors.

These enhancements to a charge increase the potential penalties and may affect prosecutorial litigation strategies. It’s therefore important to know how Illinois law defines this offense. The classification of a charge can have a major impact on sentencing exposure, sex offender registration consequences, and other legal matters.

Hire a Sexual Assault Lawyer

The Law Office of Jessica Koester, LLC, focuses on the defense of serious felony or federal criminal charges, including aggravated criminal sexual assault under Illinois law. She regularly handles cases that include issues of detailed statutory analysis, constitutional challenges, and forensic review in serious matters.

She has decades of courtroom experience and approaches each case with a disciplined analysis. Our firm can apply the law to the factual allegations and the potential defenses available. When an individual is accused, we can defend against an aggravated charge with substantial sentencing potential.

Statutory Definition of Aggravated Criminal Sexual Assault

The Illinois aggravated criminal sexual assault statute is codified in 720 ILCS 5/11-1.30. This offense is charged when sexual penetration is alleged, and one or more statutory aggravating factors are present; for example, the:

  • Use of force
  • Threat of force
  • Infliction of bodily harm
  • Threat of bodily harm
  • Display of a weapon
  • Victim’s age or disability status

Other situations that can aggravate this crime include the victim being below a certain age or force being used to accomplish the penetration. Aggravated criminal sexual assault is a Class X felony.

Common Aggravating Factors That Elevate the Charge

Illinois law defines a number of aggravating circumstances under which a criminal sexual assault becomes an aggravated criminal sexual assault. Such circumstances include:

  • The victim was seriously wounded.
  • The offender threatened or used a weapon.
  • The act was performed while committing another felony.

If the offender is 17 or older and the victim is either under the age of 13 or has a severe intellectual disability, then the statute similarly elevates the criminal charge. Such circumstances heighten the degree of the offense and the expected sentence under the Class X felony sentencing structure.

Sentencing Exposure and Long-Term Consequences

In Illinois, aggravated criminal sexual assault laws define the offense as a Class X felony. Upon a conviction for this charge, a person faces a sentence of 6 to 30 years in the Illinois Department of Corrections, with longer or even life terms possible in certain circumstances. A conviction can also subject an individual to lifetime consequences, such as being required to register as a sex offender.

According to the United States Sentencing Commission, 99.2% of offenders sentenced for the federal offense of sexual abuse were sentenced to prison. The average sentence for this offense was 221 months of incarceration.

Contact an Illinois Sexual Assault Attorney

An aggravated criminal sexual assault case involves severe statutory penalties and complex legal questions. The Law Office of Jessica Koester, LLC, analyzes how these provisions apply to individual circumstances. To take informed action, schedule a consultation to hire a sexual assault lawyer who is prepared to confront high-stakes felony prosecution.

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