A Class 4 felony in Illinois is any felony that can be punished by at least one year in state prison but no more than three. It is the lowest level of felony in the state.
Some examples of Class 4 felonies in Illinois include possession of between 30 and 500 grams of marijuana, aggravated assault and theft of government property less than $500. A person convicted of a Class 4 felony may be eligible for probation depending on the crime; the judge can issue a ruling for probation that shall not exceed 30 months. Maximum fines for all felony classes, including Class 4, can be up to $25,000.