Child support isn’t simply a percentage of one parent’s paycheck. Understanding how Illinois calculates support can help you protect your finances and make informed decisions about your children’s future.
Whether you’re going through a divorce, establishing parentage, or revisiting an existing support arrangement, questions about child support can create considerable anxiety.
How much will you pay? How much will you receive? What happens if one parent earns substantially more than the other? And does sharing parenting time equally eliminate child support?
At Giamanco Law Partners, we help parents understand how Illinois child support laws apply to their circumstances. Our goal is to help you reach an arrangement that addresses your children’s needs while accurately reflecting both parents’ financial responsibilities.
How Does Illinois Calculate Child Support?
Illinois uses an income-shares model to calculate child support.
Rather than automatically requiring one parent to pay a fixed percentage of their income, this approach considers the financial resources of both parents.
The calculation generally involves:
- Determining each parent’s income under the applicable guidelines.
- Calculating each parent’s adjusted net income.
- Combining those amounts to determine the parents’ total adjusted net income.
- Consulting the Illinois Schedule of Basic Child Support Obligations.
- Determining each parent’s proportional share of the obligation.
- Applying the appropriate parenting-time and other adjustments.
The number of children, parenting arrangements, healthcare expenses, and other circumstances may affect the final obligation.
Illinois updates its child support guidelines and related calculation tables periodically. An estimate based on outdated information may not accurately reflect the amount a court would order today.
Does Parenting Time Affect Child Support?
Yes. The amount of time children spend with each parent can affect the calculation.
Illinois has special rules for shared physical care arrangements, including situations in which both parents exercise substantial overnight parenting time.
However, equal parenting time does not automatically mean neither parent pays child support.
If one parent earns considerably more than the other, a support obligation may still exist even when parenting time is divided equally.
The appropriate calculation depends on the parties’ incomes, the actual parenting arrangement, and the applicable guidelines.
For more information about parenting arrangements, visit our Child Custody and Parenting Time page.
What Counts as Income for Child Support?
A parent’s regular salary is often only the starting point.
Depending on the circumstances, income considered for child support may include:
- Wages and salaries.
- Bonuses and commissions.
- Self-employment or business income.
- Certain retirement or pension payments.
- Investment and rental income.
- Other financial resources recognized under Illinois law.
Not every receipt of money is treated identically. Illinois law contains specific rules about income, deductions, and exclusions.
This becomes especially important when one or both parents have income that fluctuates or comes from multiple sources.
What If One Parent Is Self-Employed?
Self-employment can make child support calculations more complicated.
A business owner may receive income through salary, distributions, business profits, or other arrangements. Business expenses may also require closer examination.
The income reported on a tax return does not necessarily answer every question about the amount available for child support.
For example, an expense that receives favorable tax treatment may not be treated the same way when calculating support.
Proper financial documentation and an understanding of the business are important to reaching an accurate result.
Giamanco Law Partners can help clients identify the financial information relevant to their support obligations and address disputes involving reported income.
What About Health Insurance, Childcare, and Other Expenses?
Basic child support is not necessarily the only financial responsibility parents must address.
Depending on the circumstances, additional issues may include:
- Health insurance coverage for the children.
- Uncovered medical and dental expenses.
- Work-related childcare costs.
- Certain educational expenses.
- Extracurricular activities and other child-related costs.
Some expenses are addressed through specific statutory calculations, while others may require additional consideration or agreement.
A well-prepared support arrangement should make financial responsibilities as clear as possible.
Can Parents Agree to a Different Child Support Amount?
Parents may reach agreements about child support, but those agreements are subject to applicable law and court approval.
Illinois courts generally use the statutory guidelines, although deviations may be permitted when justified under the law.
Parents should not assume that a private agreement automatically changes an existing court order.
If you’re negotiating child support, legal guidance can help ensure that the proposed arrangement is properly documented and addresses the relevant requirements.
Can Child Support Change After Divorce?
Yes.
A support amount that was appropriate several years ago may no longer reflect a family’s circumstances.
Job loss, significant income changes, evolving parenting arrangements, and changes in children’s needs can all raise questions about modification.
However, a change in circumstances does not automatically change the amount owed under an existing order.
If you believe your support obligation should be reviewed, it is important to act promptly rather than simply paying a different amount.
Learn more on our Modifications and Enforcement page.
Understanding Your Child Support Options
Child support decisions can affect your financial stability and your children’s well-being for years.
You deserve more than a rough estimate from an online calculator.
At Giamanco Law Partners, we’ll review your financial circumstances, explain the applicable guidelines, and help you understand what a reasonable and legally appropriate support arrangement may look like.
Whether you expect to pay child support or receive it, our goal is to help you move forward with clarity and confidence.
Illinois generally uses adjusted net income under its income-shares guidelines. Determining that figure involves statutory rules about income and allowable adjustments.
No. Equal parenting time does not automatically eliminate support. The parents’ respective incomes and the shared-care calculation may still result in one parent paying the other.
A new spouse’s income generally is not simply added to a parent’s income under the ordinary child support calculation. However, particular financial circumstances may require closer legal analysis.
They may be. Variable compensation can be relevant when determining income, although the treatment of irregular or fluctuating earnings depends on the circumstances.
Yes. Self-employment income can be considered, but calculating it may require examining business records, expenses, distributions, and other financial information.
Voluntary unemployment or underemployment does not necessarily eliminate support obligations. Courts may consider earning capacity and the reasons for an income change under applicable law.
Possibly. A significant income change may support a request for modification, but an existing court order generally remains enforceable until properly changed.
Not always. The terms of the order, the child’s educational status, and Illinois law matter. Certain obligations may continue beyond age 18, and separate provisions may apply to educational expenses.
Parents can propose arrangements, but the court must consider the applicable legal requirements and the child’s interests. A private agreement alone may not be sufficient.
An official calculator can provide a useful starting estimate, but it may not account for every relevant financial or legal issue. An attorney can help evaluate the calculation in context.
