Illinois Maintenance Calculations are a set of guidelines and formulas used to determine the amount of spousal or child support paid in a divorce or separation case in the state of Illinois. The calculations are based on a number of factors, such as the parents' combined net incomes, the number of children in the family, the amount of parenting time each parent has with the children, and other considerations. The calculations are used to determine the amount of support owed by the non-custodial parent. There are two types of Illinois Maintenance Calculations: temporary and permanent. Temporary maintenance calculations are used to determine how much support should be paid during the divorce proceedings, while permanent maintenance calculations are used to determine how much support should be paid after the divorce is finalized. Both types of calculations take into account the same factors, but the permanent calculations also account for the future income of the paying parent and the cost of living for both parents.