How is child support calculated in Illinois?

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Illinois   child support   is governed by   750 ILCS 5/505  , which adopted the   Income Shares model   effective   July 1, 2017   — replacing the earlier flat-percentage approach.    1. The Income Shares Calculation   Step-by-step: 1. Determine each parent's   monthly net income   using the HFS Standardized Net Income Conversion Table (or the individualized method). 2.   Combine   the parents' net incomes. 3. Look up the   Basic Child Support Obligation   on the   Income Shares Schedule   published by the Illinois Department of Healthcare and Family Services. 4. Multiply by each parent's   percentage of combined income   to get each parent's share. 5. The   non-residential   parent pays their share to the residential parent.    2. Net Income (§ 505(a)(3))   Gross income minus federal/state income tax, Social Security/FICA, mandatory retirement, union dues, dependent and individual health insurance, prior-order child support actually paid, and maintenance actually paid.    3. Shared Physical Care (§ 505(a)(3.8))   When   each parent exercises 146 or more overnights   per year (about 40%), a   shared-parenting cross-credit   formula applies: the basic obligation is multiplied by   1.5  , prorated by income, then offset by the percentage of time with the other parent.    4. Add-Ons (§ 505(a)(3.6)-(3.7))   -   Childcare   for employment, education, or job search -   Health insurance   premiums for the child -   Extracurricular and school expenses   (discretionary) -   Uninsured medical   expenses    5. Duration (750 ILCS 5/513)   Base child support terminates at: - The child's   18th birthday  , OR -   High school graduation   if still enrolled, but not beyond age   19  .    Section 513   separately authorizes contributions to   post-secondary educational expenses   (a unique Illinois provision).    6. Modification (750 ILCS 5/510)   A party may modify child support upon a   substantial change in circumstances  , or — for orders enforced by Title IV-D agencies — every   3 years   if the recomputed amount would differ by at least   20%   (or $10/month, whichever is greater).    7. Imputed Income   Voluntary unemployment or underemployment allows the court to impute income based on prior earnings, education, and local job availability.  This is legal information, not legal advice.