Class 1 Felony Sentence in Illinois: Prison, Probation, and Fines

A Class 1 felony in Illinois carries a standard prison sentence of 4 to 15 years, with second-degree murder allowed to reach 20 and extended-term sentencing reaching 30. It is the second-most-serious felony class in the state, sitting just below Class X and above Classes 2, 3, and 4. A conviction also brings a two-year term of mandatory supervised release, fines of up to $25,000 (or $250,000 for drug offenses), and consequences that outlast the sentence itself.

What Counts as a Class 1 Felony

Second-degree murder is the offense most people recognize at this level. It applies when a killing would otherwise be first-degree murder except that the defendant acted under a sudden and intense provocation, or held an unreasonable belief that the killing was justified.¹ Other Class 1 offenses include aggravated robbery, vehicular hijacking, and production of child pornography.

Drug charges reach Class 1 at surprisingly low quantities. Delivering 1 to 15 grams of heroin, fentanyl, or cocaine qualifies, as does delivering 5 to 15 grams of LSD or certain synthetic drugs. Larger quantities become Class X.²

One point of confusion worth clearing up: aggravated kidnapping is not a Class 1 felony in Illinois. It is charged as Class X, which carries a higher mandatory range.

The Prison Sentence

Standard Range: 4 to 15 Years

The baseline is 4 to 15 years in the Illinois Department of Corrections. Judges have discretion within that window to fit the sentence to the offense and the defendant.³

Second-degree murder is the exception. Though it sits in the Class 1 tier, it carries a range of 4 to 20 years, meaning defendants convicted of second-degree murder face a ceiling five years higher than every other Class 1 offense.³

Extended Term: 15 to 30 Years

When statutory aggravating factors are present and proven, a judge can impose an extended-term sentence of 15 to 30 years.³ The prosecution has to establish those factors; the judge has to find them. When both happen, maximum exposure effectively doubles.

Firearm Enhancements Can Dwarf the Base Sentence

If a firearm is involved in the offense, mandatory add-on years apply on top of the base sentence and cannot be reduced through good-behavior credits. The additional time depends on how the weapon was used:

Possessing a firearm during the offense adds 15 years.
Personally discharging a firearm adds 20 years.
Discharging a firearm that causes great bodily harm or death adds 25 years to natural life.⁴

A defendant convicted of a Class 1 felony who discharged a firearm during the offense faces a minimum of 24 years (a 4-year base plus a 20-year enhancement) before the judge weighs any of the facts. This is where sentences run well past what the phrase “4 to 15 years” suggests.

Fines, Restitution, and Supervised Release

The maximum fine is $25,000 per offense, unless a specific statute sets a higher amount.⁵ Drug offenses are the big exception: a Class 1 drug delivery conviction can carry fines up to $250,000.² Courts may also order restitution for medical costs, property damage, or lost wages, based on evidence at trial or sentencing.

After release from prison, a person convicted of a Class 1 felony serves two years of mandatory supervised release, the Illinois version of parole.³ A violation can send the person back to prison, so state control extends past the release date.

Is Probation Possible?

Sometimes, yes. Probation is not categorically off the table for a Class 1 felony. A first-time offender may be eligible at the judge’s discretion. However, probation is prohibited if the defendant has a prior Class 1 or higher felony conviction within the preceding 10 years, or if the current offense was committed while on probation or conditional discharge for any felony.⁶ Certain specific offenses also carry their own probation bars regardless of history. Judges grant it sparingly, but the possibility makes sentencing hearings genuinely consequential.

How Judges Pick a Number Within the Range

Aggravating factors push a sentence up. Prior criminal history, a leadership role in the offense, targeting a vulnerable victim, using a position of trust, and causing extensive harm all move the number toward the top of the range. When qualifying factors are proven, they can trigger extended-term sentencing of 15 to 30 years.

Mitigating factors pull it down. A clean record, genuine remorse, cooperation with law enforcement, mental health conditions at the time of the offense, and the impact of imprisonment on dependents all matter. Courts also consider whether treatment or rehabilitation is likely to work. This is why two defendants convicted of the same Class 1 offense can receive very different sentences.

Long-Term Consequences of the Conviction

The prison term is only part of it. A Class 1 felony conviction creates barriers that last decades, and some never fully go away.

Firearms

Illinois makes it illegal for anyone convicted of a felony to possess a firearm or ammunition. A violation is a separate felony carrying 2 to 10 years in prison, and a second offense carries 3 to 14.⁷ Relief is theoretically available through the Director of the Illinois State Police, but approval is rare, and federal law independently prohibits felons from possessing firearms.

Voting

Illinois suspends voting rights only during incarceration. Once released, the right to vote is automatically restored, with no application required.⁸

Employment and Professional Licensing

Once a background check runs, a Class 1 felony is difficult to explain away, especially for positions involving financial trust, access to vulnerable populations, or security clearances. Illinois licensing agencies are required to weigh rehabilitation before denying a license, considering how long ago the conviction occurred (a general benchmark of five years since conviction or three years since release from confinement), whether the offense relates to the profession, the applicant’s age at the time, and evidence of rehabilitation. A felony is not an automatic disqualifier, but certain enumerated offenses in specific licensing statutes function as outright bars.

Travel

The TSA permanently disqualifies applicants from PreCheck and Global Entry for offenses including murder, terrorism-related crimes, and explosives violations. A broader list, including kidnapping, robbery, controlled substance distribution, and firearms violations, triggers disqualification if the conviction was within seven years of the application or the applicant was released from incarceration within five.⁹ Canada evaluates foreign records under its own law, so an Illinois offense may be treated differently at the border. Travelers with felony records who need entry can apply for a Temporary Resident Permit, or, after enough time, seek Criminal Rehabilitation status. Processing typically takes a year or longer.

Sealing the Record

Expungement, which erases a record, is generally not available for Class 1 felony convictions. Sealing, which restricts public access without erasing the record, is available for many Class 1 offenses after a three-year waiting period following the end of the last sentence.¹⁰

Not every Class 1 felony qualifies. Most sex offenses, offenses requiring registration under the Sex Offender Registration Act or the Murderer and Violent Offender Against Youth Registration Act, animal cruelty felonies, and domestic battery-related offenses are excluded.¹⁰ Sealing requires filing a petition; a judge weighs the nature of the offense, time elapsed, and the petitioner’s conduct since. Sealed records stay hidden from most employers and landlords running background checks, but remain accessible to law enforcement and certain licensing agencies. For many people, this is the single most impactful step available to reduce the long-term burden of a conviction.

1
Illinois General Assembly. Illinois Code 720 ILCS 5/9-2 – Second Degree Murder
2
Illinois General Assembly. Illinois Controlled Substances Act 720 ILCS 570/401 – Manufacture or Delivery
3
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-30 – Class 1 Felonies; Sentence
4
Illinois General Assembly. Illinois Code 730 ILCS 5/5-8-1 – Natural Life Imprisonment; Enhancements for Use of a Firearm
5
Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-50 – Fines
6
Illinois General Assembly. Illinois Code 730 ILCS 5/5-5-3 – Disposition
7
Illinois General Assembly. Illinois Code 720 ILCS 5/24-1.1 – Unlawful Possession of Weapons by Felons
8
US Vote Foundation. Can Felons Vote in Illinois
9
Transportation Security Administration. Disqualifying Offenses and Other Factors
10
Illinois General Assembly. Illinois Code 20 ILCS 2630/5.2 – Sealing and Expungement