What Should I Do if I Think My Child Support Order Needs to Be Updated?

 Posted on September 28, 2026 in Child Support

Child support orders in Illinois can be changed as a family’s situation changes. This might be relevant for a change in income, a new health condition for a parent or child, or a move to a new place.

If you want to change your child support orders, you’ll typically need to petition the court that the original order came from. If your child support order was entered by a court, you will usually ask that same court to change it. The process can be different if the order was entered through the Illinois Department of Healthcare and Family Services (HFS). The current order stays in effect until it is officially changed.

A Downers Grove, IL child support lawyer can help you through the modification process for your child support order in 2026.

When Can a Child Support Order Be Modified in Illinois?

A court can modify child support when there has been a substantial change in circumstances (750 ILCS 5/510). The law doesn’t list every qualifying example, but common ones include:

• A significant raise, job loss, or pay cut for either parent

• A shift in how much parenting time each parent has

• New medical, school, or child care costs for the child

• A new disability affecting a parent or the child

• A parent’s incarceration if it causes a major change in income or ability to pay support

The change must be ongoing. A short-term change in a parent’s income may not be enough by itself. The court will look at whether the change is substantial and at the facts of the case.

Can Illinois Child Support Be Changed Without Showing a Substantial Change in Circumstances?

In some limited situations, child support can be changed without proving a substantial change in circumstances. 

One exception applies when a parent receives child support enforcement services through Illinois Department of Healthcare and Family Services. In these cases, the current child support amount must be at least 20% and $10 per month different from the amount called for under Illinois child support guidelines. At least three years must also have passed since the order was entered or last changed.

Illinois law also allows child support to be changed without showing a major change in circumstances if the child needs health insurance or other health care support. 

If none of these exceptions apply, a parent will usually need to show that there has been a substantial change in circumstances.

How Far Back Can a Child Support Modification Go in Illinois?

A child support modification usually only applies to payments that come due after the other parent receives notice that a request for modification has been filed. Only the payments that come due after the other parent receives notice of the motion will be affected by the new amount. This means that parents who need an order updated for, say, an income change should file for a modification as soon as possible.

If you receive support and the other parent’s income has gone up, you should likewise file for a change as soon as possible. Waiting to file may mean lower payments for a longer period.

An informal deal doesn’t affect your court order for support. If you agree to accept or pay less but the order isn’t changed, the unpaid difference may still be owed as past-due support.

What Should You Do Before You File to Update Child Support in Illinois?

Start by gathering records that demonstrate the change. Useful records often include recent pay stubs, tax returns, termination letters, medical bills, or child care invoices. If your income comes from a business, bonuses, or commissions, it’s beneficial to have several years of financial records.

Illinois calculates support from both parents’ incomes, so each parent usually has to complete a financial affidavit when changes to support orders are made.

Many modification cases end with an agreed order that a judge signs, without a full hearing. Others go to a hearing when the parents can’t agree on income or expenses. An attorney can help you decide whether your situation counts as a "substantial change" and whether asking for a modification makes sense.

Call a Wheaton, IL Child Support Lawyer Today

A child support order that no longer matches your family’s situation can be a serious burden. Our Downers Grove, IL family law attorneys can review your order and help you decide whether a modification makes sense.

Roberts PC works hard to settle cases out of court to keep costs down, but we’re prepared to go to trial when an agreement isn’t possible. We have experience with large cases for business owners, professionals, doctors, lawyers, and judges, where income can be harder to calculate. Every client gets Attorney Chuck Roberts’ personal cell phone number and email address.

Call us at 630-668-4211 to schedule your free consultation.