How Illinois’ Income Shares Model Affects Your Case: Tips from a Child Support Lawyer in Schaumburg

resolving divorces
resolving divorces
March 30, 2026 · 3 min read
How Illinois’ Income Shares Model Affects Your Case: Tips from a Child Support Lawyer in Schaumburg

If you are dealing with support issues, a Child Support Lawyer Schaumburg can help you see how Illinois calculates support and what facts may change the final number. Illinois uses an income shares model, which looks at both parents’ incomes and aims to match what parents would have spent on the child if they lived together.

Why the income shares model matters

Illinois no longer bases child support on one parent’s income alone. The court starts with both parents’ incomes, converts them to net income, and then uses a state schedule to find a basic support amount. Each parent’s share is tied to that parent’s share of the combined net income. The model is used across the state, and Illinois updates the conversion table and support schedule on a regular basis.

For many parents in Schaumburg, this changes the way they think about support. A case is not only about wages. It can also involve bonus pay, self-employment income, other support duties, and even whether a parent is earning less than they could. Illinois law allows courts to look at potential income when a parent is voluntarily unemployed or underemployed.

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What can raise or lower the support amount

The base number is only part of the story. Courts may add health insurance costs for the child, child care expenses, and some school or activity costs. Those added costs are often divided between parents based on their share of combined net income. That means a support order should reflect real records, not rough guesses.

Parenting time can change the formula

Parenting time matters more than many parents expect. Under Illinois law, shared physical care rules apply when each parent has 146 or more overnights with the child in a year. When that happens, the formula changes, and the support amount may look very different from a standard case. A clear parenting schedule can make a major difference.

Courts can depart from the guideline

The guideline amount is presumed to be correct, but it is not automatic in every case. A judge may depart from it when using the guideline would be unfair or not fit the child’s best interests. Illinois law also requires written reasons for that choice. Special medical needs, unusual costs, and other strong facts may support a different result.

Practical tips for your case

Come prepared with complete income records. Bring pay stubs, tax returns, business records, proof of insurance cost, and child care bills. If your income changes often, a clean paper trail matters even more.

Track parenting time with care. A calendar, app log, or written record can help show the real number of overnights. This can be vital in a shared care case.

Do not assume an old order still fits your life. Illinois notes that a support order can be reviewed for modification when legal standards are met, such as a significant change in circumstances or, in some cases, when the order is at least three years old.

Why local legal help matters

A child support case can turn on small details. A missed expense, a weak income record, or an unclear parenting plan can affect the result. A child support lawyer in Schaumburg can help you present accurate numbers, test the other side’s claims, and push for an order that fits your child’s needs and your real finances.

The income shares model is meant to be fair, but fair outcomes still depend on strong facts. The better your records, the better your chance of getting the right support order.

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