How to Apply for Child Support in Illinois: HFS and Courts

To apply for child support in Illinois, you can submit a free application to the Illinois Department of Healthcare and Family Services (HFS) online or on paper form HFS 1283, or file a petition directly in circuit court. Most parents without an attorney use the HFS route because it costs nothing and the agency handles parentage, the order, and collection. Whichever path you take, you’ll need to establish who the child’s parents are, provide financial information about both parents, and let the state’s Income Shares formula produce the amount.

What to Have Ready Before You Start

The application asks for the same core information regardless of which path you choose:

Your full name, home address, date of birth, Social Security number, and employer or income source.
The other parent’s full name, address, Social Security number, and employer, to the extent you know them.
Each child’s full name, date of birth, and Social Security number.
Any prior court orders, including the date of divorce, the state and county where it was filed, and the docket number.

You don’t have to know everything about the other parent. The application lets you mark “don’t know” for details you can’t provide, and HFS has locate tools for missing employer and address information.¹

If you have a divorce decree, parenting time order, existing support order, or payment records, scan them into a single file. The online application only allows one attachment.

Establishing Parentage First

No child support order can be entered until parentage is legally established. If the parents were married when the child was born, parentage is presumed. If they weren’t, it has to be established separately.

The simplest option is a Voluntary Acknowledgment of Parentage (VAP). Both parents sign form HFS 3416B, and once it’s witnessed and filed with HFS, parentage is established without a court hearing. Many hospitals offer the VAP at birth, but parents can also sign one later at a county clerk’s office, a Department of Human Services office, or an HFS Child Support Services office. The signed form can be mailed to HFS.²

If one parent is unavailable or unwilling to sign, parentage has to be established through a court order. HFS can do this for you at no charge, or you can file a parentage petition on your own in circuit court. The judge may order genetic testing when parentage is disputed.

Applying Through HFS

Illinois child support program services are free.³ HFS will establish parentage, obtain a support order, and enforce it on your behalf at no cost. This is the route most parents use.

Online Application

If you live in Illinois and the child lives with you, you can complete the application on the HFS website. One catch: the system does not save your progress. Close the browser before hitting submit and you’ll lose everything you entered. Have your information ready before you start.¹

If your children have different other parents, you’ll file a separate application for each noncustodial parent.

Paper Application

You can also download and print form HFS 1283, the Application for Child Support Services, and mail it to HFS or drop it off at a local Child Support Services office.⁴ Parents who don’t live with the child use form HFS 1283N. Caretakers who aren’t biological or legal parents use form HFS 1283A.¹

Applying Through Circuit Court

Some parents go directly to court, especially when child support is part of a divorce or a parenting time case. This path can be faster if both parents already agree on a proposed order, but it involves filing fees and more procedure.

You start by filing a Petition for Child Support with the circuit clerk in the county where the case belongs. If parentage hasn’t been established, you’ll file a parentage petition too. The Illinois Courts website has standardized forms for divorce, child support, and related filings.⁵

After filing, the other parent must be formally served with a summons and a copy of the petition. The county sheriff or a private process server can handle service. If you can’t afford the filing fee, Illinois courts allow you to apply for a fee waiver based on your income, expenses, and assets.

The court will schedule one or more hearings. Both parents submit financial information so the judge can calculate support under the Income Shares guidelines. If the parents reach an agreement, the judge reviews and approves it. If they don’t, the judge enters an order based on the formula.

What Happens After You Apply

Processing times vary. A straightforward case where parentage is already established and both parents cooperate can move quickly. Cases that require genetic testing, locate work to find the other parent, or contested hearings can take several months.

If you applied through HFS, the agency will contact you for additional information and notify you of any scheduled administrative hearings. Both parents will need to provide financial details so the support amount can be calculated. Once all the information is in, HFS or the court enters a final child support order specifying the monthly amount and the payment schedule. That order is legally binding on both parents.

How the Support Amount Is Calculated

Illinois uses the Income Shares model, which estimates how much both parents would have spent on the children if they still lived together, then splits that amount based on each parent’s share of the combined income.⁶

The starting point is each parent’s gross income from all sources. Gross income does not include means-tested benefits like TANF, SSI, or SNAP. From gross income, the following mandatory deductions produce net income:

Federal and state income taxes.
FICA and Medicare taxes.
Mandatory retirement contributions and union dues.
Health insurance premiums.

⁷

Both parents’ monthly net incomes are combined and matched against a schedule of basic child support obligations published by HFS, which varies by the number of children. Each parent’s share of the total obligation is proportional to their share of the combined income.⁶ The result carries a rebuttable presumption, meaning the court treats it as the correct amount unless a parent shows that applying the formula would be inappropriate given the child’s needs, the parents’ financial resources, or the child’s prior standard of living.⁸

A parent whose gross income falls at or below 75% of the federal poverty guideline for one person owes a minimum of $40 per month per child, capped at $120 per month total. A parent with no income, who only receives means-tested benefits, or who cannot work because of a medically proven disability or incarceration may receive a zero-dollar order.⁸

When each parent has the child for 146 or more overnights per year, the shared physical care adjustment applies. The basic obligation is multiplied by 1.5 to account for duplicated household expenses, and each parent’s share is offset against the other’s. The parent who owes more pays the difference.⁹

How Payments Are Collected

Nearly all Illinois child support payments flow through the Illinois State Disbursement Unit (ILSDU), which tracks amounts owed, payments made, and any arrears, and disburses funds to the receiving parent by check, direct deposit, or debit card.¹⁰

Under the Income Withholding for Support Act, every child support order entered since July 1, 1997, requires an income withholding notice to be served on the paying parent’s employer immediately, unless both parents agree in writing to an alternative payment arrangement approved by the court. The employer must begin deducting the ordered amount within 14 days of receiving the notice and forward the withheld funds to the ILSDU within 7 business days.¹¹

A parent who is self-employed or doesn’t have wages subject to withholding can pay through the ILSDU using credit or debit cards via ExpertPay, MoneyGram, or PayPal.¹⁰ Routing payments through the ILSDU creates an official record that protects both parents if a dispute arises later.

Changing the Order Later

Circumstances change. HFS will consider a modification when a recalculation would produce an increase or decrease of 20% or more compared to the current order.¹²

Common reasons include job loss, a significant income change, a change in custody or parenting time, a change in family size, disability, incarceration, or military deployment. HFS cases are automatically reviewed every three years, but either parent can request a review sooner if circumstances warrant it. To request a modification through HFS, you can submit the online modification form or complete a fillable Affidavit of Income and Expenses and email it to the customer service unit. If HFS denies your request, you still have the right to ask a judge to decide.¹²

1
Illinois Department of Healthcare and Family Services. Application for Child Support Services (Title IV-D)
2
Illinois Department of Healthcare and Family Services. Establish Parentage
3
Illinois Department of Healthcare and Family Services. Child Support Services Program
4
Illinois Department of Healthcare and Family Services. Application for Child Support Services (HFS 1283)
5
Office of the Illinois Courts. Divorce, Child Support, and Maintenance
6
Illinois General Assembly. Illinois Compiled Statutes 750 ILCS 5/505
7
Illinois Department of Healthcare and Family Services. Income Shares and Child Support Calculation
8
FindLaw. Illinois Statutes Chapter 750 Families 5/505 – Child Support
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Illinois Department of Healthcare and Family Services. Income Shares FAQs
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Illinois State Disbursement Unit. Illinois State Disbursement Unit
11
Illinois General Assembly. Income Withholding for Support Act
12
Illinois Department of Healthcare and Family Services. Request a Modification