In simple calculation for child support, the percentage share of the basic child support obligation will determine how much support an obligor will be required to pay under the Illinois Income Shares model. To calculate the percentage share of the basic child support obligation, the following steps should be taken:

(1) Both parent’s net income is determined by a standard tax amount or an individualized tax amount.

(2) The two net incomes are added together to determine combined net income.

(3) A parent’s income is divided by the combined net income to determine Percentage Share of the Basic Child Support Obligation. The value will be expressed as a decimal not a percentage

example:

One parent makes 6000 per month net and the other parent makes 4000 per month net.

The combined net income is $10,000.

The first parent’s percentage share of the Basic Child Support obligation is 6000 divided by 10,000 or .60

The second parent’s percentage share of the Basic Child Support Obligation is 4000 divided by 10000 or .40

This decimal will be multiplied against the basic child support obligation to determine an individualized child support order.