How support is calculated, modified, and enforced — from guidelines to college expenses.
Illinois child support averages $1,215/month for one child. Learn the Income Shares model calculation, 2026 guidelines, and modification rules under 750 ILCS 5/505.
Child support is not taxable in Illinois. Learn IRS rules, Child Tax Credit ($2,200/child), Form 8332, and how Illinois parents handle taxes after divorce in 2026.
Child support in Illinois ends at age 18, or 19 if the child is still in high school. Learn about emancipation, college expenses under 750 ILCS 5/513, and disabled adult child support.
Use the Illinois child support calculator to estimate payments under the income shares model. Filing fees $210-$388. Updated guidelines effective March 2025.