How to Modify Your Child Support Order in Illinois

 Posted on July 12, 2026 in Family Law

If you are a divorced parent, the state of Illinois requires you and your former spouse to contribute to your children's financial needs. In some cases, Illinois allows child support orders to be reviewed periodically, including through the Department of Healthcare and Family Services' child support program.

But what if a child's needs or your financial situation change before then? In this case, you can petition the court to have the child support order modified. If you need to revisit your child support order in 2026, a Geneva, IL child support lawyer can help you understand the process.

What Qualifies as a Substantial Change in Circumstances in Illinois?

Illinois law (750 ILCS 5/510) requires that anyone seeking modification show a substantial change in circumstances since the last order was entered. You may be a good candidate for a child support modification in a variety of situations. Some of the most common include:

• Your child's needs have changed considerably, such as a new health condition

• The paying parent's income has increased or decreased substantially

• The receiving parent's income has increased or decreased significantly

• The child's expenses are not being adequately met by the current order

Courts typically won't modify a support order for minor fluctuations in income or temporary changes. The new circumstances need to be meaningful and ongoing.

How Do You Change Your Child Support Order in Illinois?

Any adjustment to your child support can only go back to the date your motion was filed, and not before. Because of this, it’s important to file your request for a modification review as soon as you know you need one.

The Illinois Department of Healthcare and Family Services (HFS), Division of Child Support Services (DCSS), generally handles child support modifications. However, you may want to work with a family law attorney for help and to expedite the process.

Typically, DCSS will inform both parents whether their child support order qualifies for a modification review within 30 days. If your order qualifies, DCSS will use the parents' income, employment status, and other information to recalculate the expected amount of the child support payment. The agency will then notify you whether the child support payment has increased, decreased, or stayed the same.

If your existing child support obligation was established by a court order, any modification must generally be approved by the court. A judicial order means it came through a family court rather than through DCSS. The filing and hearing procedures differ depending on how the original order was established. This is another reason working with an attorney early can prevent delays.

How Is the Modified Child Support Amount Determined in Illinois?

Illinois uses the same income shares model to calculate child support, whether the order is being set for the first time or modified. Ideally, the child should receive the same level of financial support they would have received if the family had remained intact.

The calculation starts by combining both parents' net incomes. The Illinois Schedule of Basic Child Support Obligations (a table published by the Department of Healthcare and Family Services) is then consulted to find the baseline amount of support for that income level and number of children. Each parent's share is then determined by their percentage of the combined income.

Add-on expenses are calculated separately and split in proportion to each parent's income share. These can include health insurance premiums, unreimbursed medical costs, and childcare. If parenting time has also changed since the original order, that can also affect the calculation. The more overnight time a parent has with the child, the less support they may be required to pay.

How Do You Enforce Child Support Orders if the Other Parent Won’t Comply?

A modification order, once entered, carries the same legal weight as the original. If the paying parent fails to follow the modified order, the same enforcement tools may be used as with the original order.

Illinois courts and DCSS can pursue enforcement through:

• Wage withholding

• Interception of tax refunds

• Suspension of professional or driver's licenses for serious cases

Contempt of court may be used for willful noncompliance. If you're dealing with a parent who isn't paying after a modification was entered, document the missed payments. Contact your attorney about enforcement options.

What If You Disagree With Your Updated Child Support Order?

If your payment amount remains the same, you can ask for a redetermination by DCSS. If you have an administrative order, you can request an administrative hearing to contest it. If you have a judicial order, you can appear in court to contest the amount ordered.

Remember, the hearing's purpose is to determine whether the support payment amount is equitable based on the circumstances. Whether the paying parent is capable of paying the determined amount must also be considered. If not, the support payment may be lowered by a finding of the hearing officer or the court.

Call a Kane County, IL Child Support Lawyer Today

If your financial situation has changed, now is the time to petition the court to modify an existing child support order. Our Geneva, IL family law attorneys at Serrano Hanson & Hurtado, LLC offer free consultations and serve clients in both English and Spanish.

Call us at 630-844-8781 to schedule your appointment today. Se habla español.