Child Support in Illinois
Calculating Net Income for Child Support
To calculate child support in Illinois, you’ll need to add up the non-custodial parent’s available “net income.” This includes all income, whether earned or unearned, minus any applicable deductions and adjustments listed in the guidelines. Common examples of income are wages, commissions, self-employment earnings, and investment income. Deductions include federal and state income taxes, social security tax, mandatory retirement contributions, union dues, health insurance premiums for the non-custodial parent or dependents, expenses necessary to produce income, medical expenses necessary for life or health, and any reasonable amounts already paid for the benefit of the child or the custodial parent, not including gifts. The non-custodial parent can also deduct any court-ordered alimony (spousal support) or child support previously paid
