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Date: 09/13/2025

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  3. Child support and child care
  4. Starting a case to change child support payments

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Starting a case to change child support payments How-To
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At some point, child support payments may need to be changed or terminated. Either the receiving or paying parent can start this process. Until a judge orders the change, the original child support payments must be continued.

Learn more about changing or ending child support payments.

Decide if you need a lawyer to change child support payments

You should speak with a lawyer Someone who represents clients in courts or who gives legal advice if:

  • The child's living situation has changed. For example, the child is now living with you or someone other than the person with the majority of parenting time Time that a child spends with a parent. Usually, the child lives mostly with one parent and has regular contact with the other (formerly called visitation).
  • You owe back child support Money paid by a parent to help another parent support a minor child or an adult child with a disability
  • You want to file your petition (noun) A written request to a court (verb) To request from a court in a different judicial circuit than where your case was originally filed
  • You have more than one child support order A decision by a court telling a parent to pay child support
Fill out your forms for child support modification

Fill out and sign the forms listed below. Make at least 3 copies of each form.

  • Petition for Modification of Child Support: This program will help you prepare the following forms:
    • Petition for Modification of Child Support
    • Certificate of Mailing of Petition for Modification of Child Support
    • Notice of Hearing When the parties in a case present their sides of a case to a judge or other officer
    • Child Support Information Sheet
    • Certificate of Mailing Notice of Hearing
    • Order for Support
    • Order Modifying Child Support
    • Summons A notice to a defendant that a lawsuit against them was filed in a court and that the defendant has to show up in court : Tells the other person that a lawsuit was filed against them. 

There are fees to file many court forms, especially when starting a case. Fees are different from case to case and county to county. Contact the circuit clerk The office that takes care of files and documents for circuit court cases to find out about their fees. Many circuit clerks list their fees on their website.

If you qualify, you can get a fee waiver. A fee waiver allows you to file for free, or at a reduced cost.

Note: liability for child support does not require a previous court order for parental responsibilities Making important decisions for a child (significant decision-making responsibility) and spending time with them (parenting time) .

File your forms with the court

Now that you have filled out your forms, you need to file them with the appropriate circuit clerk. You will need to electronically file ("e-file") them unless you have an exemption. 

Do this at the courthouse in the county where the original Child Support Order A decision by a court telling a parent to pay child support was entered. If you or the other parent does not live in the judicial circuit where the original case was filed, you may be able to file your petition (noun) A written request to a court (verb) To request from a court in the original judicial circuit or where either of you now lives. View a map of judicial circuits on the Illinois Courts website  ​

Note: It is a good idea to talk to a lawyer Someone who represents clients in courts or who gives legal advice if you want to file your petition in a different judicial circuit than where your case was originally filed. 

You should file the following forms:

  • Petition for Modification of Child Support Money paid by a parent to help another parent support a minor child or an adult child with a disability - an original and two copies (attach a copy of your last Child Support Order to each Petition)
  • Child Support Information Sheet
  • Application for Waiver A document that gives up a legal right or excuses a requirement of Court Fees (if applicable)


 

Tell the other parent about the request to modify child support

After filing, you must notify the other parent about your request to modify To change or adjust child support Money paid by a parent to help another parent support a minor child or an adult child with a disability . You will need to:

  • Mail a file-stamped copy of your Petition (noun) A written request to a court (verb) To request from a court to the other party A person or business involved in a court case in a role like plaintiff, petitioner, defendant, respondent, or intervenor. ;
  • File a Certificate of Mailing Petition for Modification of Child Support with the circuit clerk The office that takes care of files and documents for circuit court cases certifying the date you mailed it and the address where you mailed it; and
  • Mail a file-stamped copy of the Certificate of Mailing to the other parent.

The other parent may waive To give up a legal right or pardon a fee the mail notice and agree to the terms of your Petition. If so, have the other parent sign the Entry of Appearance A form that lets the plaintiff and the court know the defendant is participating in the case. It can also be when a person shows up to their court hearing. , Waiver A document that gives up a legal right or excuses a requirement , and Consent When someone gives permission for someone else to do something form. You can get this form from the circuit clerk's office in your courthouse.

Please note that the other parent must have seen a copy of the Petition and a copy of the Order Modifying Child Support you plan to give to the judge. The other parent's signature must be notarized. If they do not sign this form, you will need to mail it as described.

You must also send a file-stamped copy of the Petition for Modification of Child Support to the Illinois Department of Healthcare and Family Services (HFS) and file a Certificate of Mailing of Petition for Modification of Child Support with the court if either of the following is true:

  • The person receiving child support is receiving cash assistance from HFS; or
  • If the IV-D Services helped the person receiving child support get the original Order you are trying to modify.

Then you must mail a file-stamped copy of the Certificate of Mailing of Petition for Modification of Child Support to the HFS office.

You can check the court file or the original Child Support Order A decision by a court telling a parent to pay child support to get their current mailing address. If you cannot find this information, call the HFS' toll-free number at (800) 447-4278. 

Request a hearing date for your child support modification

Depending on whether you e-filed the petition (noun) A written request to a court (verb) To request from a court or paper filed it and in which county you filed your Petition, you will need to obtain a hearing When the parties in a case present their sides of a case to a judge or other officer date. 

How you will find out about the court date (or hearing date) and time depends on how you filed your case.

  • E-filing Short for "electronic filing." You file court papers using a computer instead of handing them to the clerk in person. This is required in Illinois as of 1/1/18. : The website you used to electronically file may let you pick your court date (or hearing date) and time. If it does not, contact the clerk. 
    Paper filing: If you filed in person at the courthouse, the clerk will let you pick or they may pick for you.

Some counties will notify the other parent of the hearing date, but in most counties, you need to complete and send the Notice of Hearing form to the other parent. You will then need to file with the circuit clerk The office that takes care of files and documents for circuit court cases the Certificate of Mailing of Notice of Hearing to certify when you mailed it.

Prepare for the child support modification hearing

Prepare your testimony Evidence given orally by witnesses using the Petition (noun) A written request to a court (verb) To request from a court for Modification of Child Support Money paid by a parent to help another parent support a minor child or an adult child with a disability as your guide. You will need to testify To answer questions under oath about all of the facts in your Petition (the numbered parts of the Petition). You will also need to testify as to what you want the court to do (the lettered parts of the Petition).

If you ask the court to do something that was not in your Petition, you may have to fix your Petition.

Go to court for the child support modification hearing

Go to court on the date listed on your Notice of Hearing When the parties in a case present their sides of a case to a judge or other officer .

It is important to follow the below suggestions when going to court:

You have the right to represent yourself in court. However, you are expected to follow the court's rules and procedures. Most people who work in the courthouse cannot give you legal advice; meaning they cannot help you decide what to do, evaluate your possibility of success, or present your argument to the judge.

To navigate the court system, you need basic information about your case. Most of the information should be listed on court papers:

  • Plaintiff A person or party that starts a lawsuit 's or Petitioner A person who makes a written request to a court 's name
  • Defendant The person or organization being sued in a lawsuit 's or Respondent A person who has a petition filed against them 's name
  • Case number A number assigned to a case that is on every paper filed in the case
  • Judicial circuit
  • County
  • Division
     

If you are filing a case, you are called the plaintiff. If a case has been filed against you, you are called the defendant. In some cases, the plaintiff is called the petitioner, and the defendant is called the respondent. When proceeding on a Petition (noun) A written request to a court (verb) To request from a court for Modification of Child Support, you will maintain the same label as you were given in the original case; i.e. if you were the Respondent before, you will still be the Respondent.
 

Bring these items with you to court:

  • Copies of all the documents you filed with the Circuit Clerk The office that takes care of files and documents for circuit court cases
  • Any witnesses you want to testify To answer questions under oath
  • Any documents you want the judge to look at
  • A photo ID
  • Follow these suggestions when going to court:
  • Be polite and dress the way you would for a job interview;
  • Get to the courthouse at least 30-45 minutes before your hearing time;
  • Go to the courtroom number on your court forms. If your forms do not have a courtroom number, look for a list of cases at the courthouse or ask the circuit clerk;
  • Check in with the judge’s clerk or coordinator sitting on either side of the judge’s seat;
  • Know your line number and tell the clerk or coordinator your name and line number (you may have to sit outside the courtroom);
  • Listen for your name or your line number to be called and then step up to the bench Where the judge sits. Usually a table and a chair. Not an actual bench. ;
  • Be prepared to swear to tell the truth and to answer A written statement used to respond to the complaint or petition in a lawsuit questions truthfully;
  • Explain briefly the issue you would like to address before leaving the courthouse;
  • Listen for the court to tell you what will happen next, after hearing from you and the other side;
  • You should receive a copy of whatever order is entered that day. Don’t leave the courtroom without it.

Bring copies of all the documents you filed and any papers relating to what you are requesting, including your request for child support. To testify, you will need to call yourself as a witness A person who answers questions in court under oath . The judge or the judge's clerk will put you under oath, and you will present your testimony Evidence given orally by witnesses .

When you testify, your testimony should include:

  1. Your name and address;
  2. The other party A person or business involved in a court case in a role like plaintiff, petitioner, defendant, respondent, or intervenor. 's name;
  3. The names and birth dates of the children you have with the other party;
  4. The names and birth dates of the other party’s children from other relationships;
  5. Where the children live;
  6. How much income the other parent has and where it comes from (should include from all sources);
  7. How much income you have and where it comes from (should include from all sources);
  8. What has changed since the last child support order A decision by a court telling a parent to pay child support ;
  9. What the current support amount is and why you think it should be changed;
  10. How much you want the support amount to be; and
  11. Whether the other party is providing health insurance for your minor A person under 18 years old children and the monthly cost of the premiums Money that must be paid every month, such as for health insurance .

If the judge grants your Petition, present your Order for Modification of Child Support and Order for Support to be signed. If the judge wants corrections made, don't panic. You can ask for permission to submit a corrected version by mail.

If this is your first time going to court, learn more about the process of Going to court in Illinois.

If your Petition for Modification of Child Support is granted

After the judge has signed the Order Modifying Child Support and Order of Support, you must send a file-stamped copy of the Orders to the other parent. To certify (prove) that you have done this, you will need to file a Certificate of Mailing with the circuit clerk.

Like all documents you file, be sure to keep file-stamped copies of these documents for yourself. Remember to hold on to the Orders as they are your proof that the support has been modified. If you lose the Orders, however, don't panic. As with any document you file, you can always get another copy from the circuit clerk.

If you are the parent receiving support, you may also need to complete and file the Notice to Withhold Income for Child Support. After you have filed the Notice, mail a copy to the paying parent's employer so that the child support can be deducted from his or her paycheck.

To certify (prove) that you have done this, you will need to file an Affidavit of Service A written statement signed under oath. It describes where, when, and how a person received court documents. of Notice to Withhold Income for Child Support with the circuit clerk. Be sure to keep stamped copies of these documents for yourself.

If your Petition for Modification of Child Support is denied

If your request was denied because you did not have enough evidence Anything used to show that something is true , then you will have to wait until circumstances change before you can file another Petition. This is because once the court makes a decision about an incident or an event, it cannot address that same incident or event again.

If your request was denied because of some procedural error on your part, then you should correct the error and request another hearing.

Last full review by a subject matter expert
January 25, 2024
Last revised by staff
February 29, 2024

About our legal information

Forms

Financial affidavit Easy Form
This Easy Form helps you provide financial information and documents to the other party in family law cases. It uses the statewide Financial Affidavit (Family and Divorce Cases) forms.
Request to change child support Easy Form
This Easy Form helps you make forms to ask the court to increase or decrease your current child support order. This is called child support modification.
Motion to modify the allocation of parental responsibilities Blank form
Use this form to change the allocation of parental responsibility or child support.

Learn more

Changing or ending child support payment common questions

Worried about doing this on your own?  You may be able to get free legal help.

Apply Online

Forms

Financial affidavit Easy Form
This Easy Form helps you provide financial information and documents to the other party in family law cases. It uses the statewide Financial Affidavit (Family and Divorce Cases) forms.
Request to change child support Easy Form
This Easy Form helps you make forms to ask the court to increase or decrease your current child support order. This is called child support modification.
Motion to modify the allocation of parental responsibilities Blank form
Use this form to change the allocation of parental responsibility or child support.

Learn more

Changing or ending child support payment common questions
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© 2025 Illinois Legal Aid Online. 
All rights reserved.
 
ILAO is a registered 501(c)(3) nonprofit organization. ILAO's tax identification number is 20-2917133.