In this article, our Kane County child support lawyers explain the current state of Illinois child support law. Prior to 2017, the amount of child support required to be paid by an obligor parent was a fixed percentage of the obligor's income that varied based on the number of children involved. According to the "income shares" model of child support adopted by Illinois law in July of 2017, the amount of child support the obligor parent is required to pay is based on the obligor's income relative to that of the obligee.