Illinois Child Support Calculator
Estimate child support using the Illinois "Income Shares" model.
Illinois Child Support Calculator: Understanding the "Income Shares" Model
In 2017, Illinois completely changed how it handles child support. The state moved away from a simple "percentage of income" model to the more modern Income Shares Model. This change was designed to be fairer to both parents and better reflect the actual costs of raising a child today. To navigate these updated rules, you need an Illinois Child Support Calculator.
In this guide, we’ll explain the "Shared Parenting" adjustment, what counts as net income, and how you can use this tool to plan for your family’s financial future.
How the Illinois Income Shares Model Works
The current Illinois model is based on the combined net income of both parents. The state uses a "Schedule of Basic Child Support Obligations" to determine how much a typical family with that income level would spend on their children. That total amount is then divided between the parents based on their individual share of the combined income.
Why You Need an Illinois Child Support Calculator
- The "146 Nights" Rule: This is the biggest feature of the Illinois law. If each parent has the child for at least 146 nights per year, it’s considered "Shared Parenting." This triggers a complex mathematical adjustment that usually lowers the support payment. The calculator handles this math for you.
- Accurate Net Income: Illinois allows for specific tax deductions to reach your "Net Income." The calculator helps you "net out" these numbers correctly so you aren't overpaying or under-receiving.
- Mandatory "Add-ons": In Illinois, parents are also required to share the costs of health insurance, childcare, and extracurricular activities. The calculator helps you factor these into your monthly budget.
- Prepare for Court: Whether you’re working with a mediator or a judge, having a reliable estimate from a calculator gives you a solid starting point for negotiations.
What Counts as "Income" in Illinois?
Illinois defines income very broadly. It’s not just your paycheck! It includes:
- Wages, tips, and bonuses.
- Interest and investment income.
- Social Security and disability benefits.
- Even spousal support (maintenance) received from a previous relationship.
College Expenses in Illinois
Illinois is one of the few states where a court can order parents to contribute to non-minor educational expenses (college). While this is handled separately from standard child support, knowing your "Income Share" percentage from the calculator is often the starting point for how these college costs are divided.
Frequently Asked Questions
1. Can the court change the calculator's number?
Yes. If a judge finds that the guideline amount is not in the "best interests of the child," they can deviate. However, they must provide a written reason for doing so.
2. How long does child support last in Illinois?
Usually until the child turns 18, or if they are still in high school, until they graduate or turn 19, whichever comes first.
3. Does the calculator include health insurance?
Yes. The cost of the child's health insurance premium is added to the basic support obligation and shared proportionally between the parents.
4. What if the other parent isn't working?
If a parent is "voluntarily unemployed," the court can impute income to them based on their work history and the local job market. The calculator allows you to test these "imputed" scenarios.
5. How do I change my child support order in Illinois?
You must show a "substantial change in circumstances." This could be a 20% change in income, a change in the child's needs, or a major change in the parenting schedule.
Final Thoughts
An Illinois Child Support Calculator takes the "guesswork" out of a complex legal system. It empowers you with the facts and helps you focus on providing a stable, happy environment for your children. Use the tool, get your numbers, and move forward with peace of mind.