child support in illinois In the State of Illnois, the minimum child support obligation for one child is 20% of the non-custodial parents net income.  Some states it’s 60% so I guess Illinois is very easy on people.

Number of Children Percent of Non-Custodial Parent’s Net Income
1 20%
2 28%
3 32%
4 40%
5 45%
6 or more 50%