Attempted Murder in Illinois: Class X Sentences & Firearm Enhancements

Attempted first-degree murder in Illinois is a Class X felony with a base sentence of 6 to 30 years in prison and no possibility of probation. Firearm use adds a mandatory 15, 20, or 25 years (up to natural life) on top of that base, and when the victim is a police officer, firefighter, or other protected person the range jumps to 20 to 80 years. Most defendants must serve about 85% of whatever sentence the judge imposes.

The Base Class X Range

Attempted first-degree murder is punished as a Class X felony, the most serious felony classification Illinois uses apart from first-degree murder itself.¹ The standard sentencing range for a Class X felony is 6 to 30 years in prison. An extended term, available where statutory aggravating factors apply, raises that range to 30 to 60 years.²

Probation, conditional discharge, and periodic imprisonment are not available. Illinois law prohibits those alternatives for every Class X conviction.³ A conviction means prison time. The judge may also impose fines and order restitution to the victim.²

Where in the 6-to-30-year window a sentence lands turns on the facts: the defendant’s criminal history, the seriousness of injuries, the degree of planning, and the mix of aggravating and mitigating circumstances. A first offender who caused no physical injury will usually see something closer to the floor. A defendant with prior violent felonies whose victim nearly died can expect the top of the range or an extended term.

Firearm Enhancements That Stack on Top

Guns change the arithmetic in a hurry. Illinois adds mandatory firearm enhancements to the base Class X sentence, tiered by how the weapon was used:¹

Armed with a firearm during the offense: 15 years added, even if the gun was never fired.
Personally discharging a firearm during the offense: 20 years added.
Discharging a firearm that causes great bodily harm, permanent disability, permanent disfigurement, or death: 25 years to natural life added.

Run the math on a minimum sentence. A defendant who gets the 6-year base floor but carried a firearm serves a minimum of 21 years. If that defendant fired the gun and seriously injured the victim, the floor rises to roughly 31 years and the ceiling can reach life. Because most attempted murder prosecutions in Illinois involve firearms, these enhanced ranges, rather than the plain 6-to-30, describe what most defendants actually face.

Aggravated Attempted Murder: 20 to 80 Years

When the intended victim falls into a protected category, the base range itself shifts. Attempted first-degree murder of a peace officer, firefighter, or emergency management worker acting in an official capacity carries a sentence of 20 to 80 years, replacing the standard 6-to-30 Class X range.¹

Firearm enhancements still stack on top of that elevated range. A defendant convicted of trying to kill a police officer by firing a weapon faces a minimum of 40 years (the 20-year base floor plus the 20-year discharge enhancement), and the ceiling stretches much higher. That is why 50-year sentences and above are common in these cases. One illustration: in People v. Taylor, the defendant received 30 years on the base charge for attempted murder of a peace officer plus 20 more years for discharging a firearm, for a 50-year sentence.⁴

How Much Time Will Actually Be Served?

Illinois’s truth-in-sentencing law restricts sentence credit for people convicted of attempted first-degree murder to no more than 4.5 days per month of imprisonment.⁵ In practice that means roughly 85% of the imposed sentence must be served before release. A 20-year sentence translates to at least 17 years behind bars. A 40-year sentence means at least 34.

This is a sharp break from many Illinois felonies, where defendants earn day-for-day credit and serve about half their sentence. Attempted first-degree murder is specifically listed among the offenses subject to the restricted-credit rule.⁵

After release, a 3-year term of mandatory supervised release follows (Illinois’s version of parole).² Violating its conditions can send the person back to prison. So a 20-year sentence works out to about 17 years inside followed by 3 years of supervision.

What the State Has to Prove to Trigger These Penalties

None of these numbers apply unless the prosecution proves two elements under 720 ILCS 5/8-4: that the defendant specifically intended to kill another person, and that the defendant took a substantial step toward carrying out that killing.¹ Both are required. Serious injury without proof of intent to cause death is not enough; the charge becomes something else, often aggravated battery, with a much lower exposure.

Intent is what separates attempted murder from reckless violence. Courts look at the weapon used, where the shots or blows were directed, anything the defendant said before or during the incident, and the nature of the injuries. The substantial-step element filters out people who only thought about killing or made vague plans. In People v. Terrell, the Illinois Supreme Court upheld an attempt conviction where the defendant was found hiding near a business with a loaded revolver and a stocking mask, waiting for it to open; possessing the tools of the crime at the planned location crossed the line from preparation into attempt.⁶

Impossibility is not a defense. Shooting at an empty bed, believing the victim was asleep in it, still supports the charge.¹

Attempted Second-Degree Murder Is Sentenced Differently

Everything above applies to attempted first-degree murder. Illinois’s attempt statute generally classifies an attempt one level below the completed offense, but attempted first-degree murder is the exception that stays at Class X.¹ Second-degree murder is a Class 1 felony, so an attempt to commit second-degree murder is a Class 2 felony, with a dramatically lower range. The gap between a Class X exposure with firearm enhancements and a Class 2 sentence is one reason the degree charged often drives plea negotiations.

When Federal Law Applies Instead

Most attempted murder cases in Illinois are state prosecutions. Federal jurisdiction kicks in when the offense happens on federal land, a military installation, or within the special maritime and territorial jurisdiction of the United States, or when the victim is a federal official or the conduct ties into other federal crimes. Under 18 U.S.C. § 1113, federal attempted murder carries up to 20 years, a fine, or both, and sentencing follows the federal guidelines rather than the Illinois Class X framework.⁷

1
Illinois General Assembly. Illinois Code 720 ILCS 5/8-4 – Attempt
2
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-25 – Class X Felonies Sentence
3
Illinois General Assembly. Illinois Code 730 ILCS 5/5-5-3 – Disposition
4
Supreme Court of Illinois. People v Taylor, 2023 IL 128316
5
Illinois General Assembly. Illinois Code 730 ILCS 5/3-6-3 – Rules and Regulations for Sentence Credit
6
Justia. People v Terrell, 99 Ill 2d 427
7
Office of the Law Revision Counsel. 18 USC 1113 – Attempt to Commit Murder or Manslaughter