Child support in Illinois is a key factor in ensuring children’s financial needs are met after a divorce or separation. Judges rely on several important factors when calculating how much child support one parent will pay to the other.
Illinois child support guidelines
In Illinois, judges primarily use a set of guidelines to calculate child support. These guidelines take into account each parent’s income and the number of children involved. The parent with the majority of parenting time (formerly known as primary custody) typically receives the child support payments. The non-custodial parent, or the parent who spends less time with the children, is usually responsible for paying child support.
Income shares model
Illinois follows the income shares model, meaning that both parents are expected to contribute to the child’s financial needs based on their incomes. This model assumes that children should benefit from the same standard of living they would have if the parents were still together. The judge will assess both parents’ income from all sources, including salary, wages, bonuses, and other earnings. The total combined income of both parents is used to calculate the support amount.
Other factors considered by the court
Besides income, judges also consider several other factors when determining child support. These factors can include the needs of the child, medical expenses, educational costs, and the amount of time each parent spends with the child. If a parent is paying for private schooling or extracurricular activities, these costs may also be factored into the child support determination.
Modification of child support
Child support amounts can be adjusted if there is a significant change in either parent’s financial situation or the child’s needs. Parents can request a modification of the support order if circumstances such as job loss, a change in income, or changes in the child’s medical or educational needs occur.

