Yes. When making the calculations to determine the percentage of child support -- you base it on net income. Net income is what is left after health care deductions, union dues, etc. In other words, his "take home pay."
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Based on the recent changes to the laws in Illinois regarding child support obligations, you can file a petition seeking contribution from the non-custodial parent toward uncovered medical expenses, child care, education, and extracurricular activities for your child. The court can order him to contribute toward those expenses in addition to his child support obligation. This may be an avenue worth investigating if you are in need of additional support for your child and if these issues were not previously addressed.