This is another big change that is taking place in Illinois. It actually has not yet been made, but there is new legislation that goes into effect on July 1, 2017, which will completely change the way child support is calculated in Illinois, rather than relying on the net income of the noncustodial parent, which is no longer noncustodial either. The new law will introduce an income share system, which relies on a more comprehensive set of factors when calculating child support.
Historically, child support was determined using a formula which depended on the noncustodial parent’s net income. This basic formula uses the number of children to determine the guideline percentage. For example, for one child it was 20% of the net income, 28% for two children, 32% for three children, and so on.