Complete the on-line application for free child support services if you live in Illinois and the dependent child(ren) lives with you. View the application.Download and complete Divorce, Child Support, and Maintenance forms from the Illinois Office of the Courts. In Illinois, to be eligible for alimony, spouses must have been legally married. Either husband or wife can qualify for alimony. A DuPage County, IL divorce attorney can help you determine whether child support and alimony will be a part of your divorce agreement. Learn how child support is calculated in Illinois, whether parents can agree to support below the guidelines, and how to change the amount of support. Complete the income withholding documents. The termination of alimony is a substantial change in circumstances warranting the modification of child support. The Child Support Application is available for download in Portable Document Format (PDF).