Under Illinois law both parents have a legal obligation to financially support their children, but not necessarily equally. Child support isn’t calculated by simply determining and splitting expenses.
In Illinois, child support issues are governed by the Illinois Marriage and Dissolution of Marriage Act (the “Illinois Divorce Act”) which directs the Court to apply “Statutory Guideline” percentages (depending on the number of children) to the “Net Income” (which is defined in 750 ILCS 5/505) of the non-custodial parent to determine the proper Child Support amount.