Illinois Child Support Calculator 2025

Illinois uses an Income Shares model updated in 2017. Both parents' net incomes are combined and support is calculated from the state schedule. A shared parenting adjustment applies when the paying parent has 146+ overnight visits per year.

Paying Parent's Gross Monthly Income

Receiving Parent's Gross Monthly Income

Number of Children

Paying Parent's Overnights Per Year: 73 nights

0 nights146 (threshold)365 nights

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