Complete the on-line application for free child support services if you live in Illinois and the dependent child(ren) lives with you. Download and complete Divorce, Child Support, and Maintenance forms from the Illinois Office of the Courts.If you have any questions, please feel free to contact us at . To learn how to fill out the forms and file them with the court, read the HOW TO GET AN ORDER FOR. SUPPORT instruction sheet and the instructions on the forms. The formulas used to calculate child support consider the combined income of both parents. The receiving spouse's income plus maintenance cannot exceed 40 percent of the couple's combined gross income. In Illinois, spousal maintenance is a right just like child support is a right. However, there are limits to this right. It requires one spouse to provide financial support to the other for a determined amount of time.