Child Support Calculation Worksheet - Illinois

IMPORTANT: THIS IS A PREPARATION GUIDE — NOT THE OFFICIAL COURT WORKSHEET

Illinois requires the use of the official Supreme Court-approved Child Support Worksheet for child support calculations.
This template provides the substantive content and calculation methodology to help you
prepare — but you must transfer your figures to the official worksheet before filing.
The official forms are available at https://www.illinoiscourts.gov/documents-and-forms/approved-forms.
Do not file this document directly with the court.

CHILD SUPPORT CALCULATION WORKSHEET

State of Illinois -- Income Shares Model

750 ILCS 5/505 and 505.1

Table of Contents

1. Case Information
2. Identification of Children
3. Gross Income Determination
4. Standardized Tax and Deductions
5. Net Monthly Income
6. Basic Support Obligation
7. Additional Expenses
8. Parenting Time Adjustment
9. Deviation Factors
10. Duration and Modification
11. Certification and Signatures
12. Sources and References

1. Case Information

2. Identification of Children

Total Number of Children Subject to This Order: [____]

3. Gross Income Determination

3A. Monthly Gross Income

3B. Imputed Income (If Applicable)

☐ Parent 1 voluntarily unemployed/underemployed -- Imputed income: $[________]/month

☐ Parent 2 voluntarily unemployed/underemployed -- Imputed income: $[________]/month

4. Standardized Tax and Deductions

5. Net Monthly Income

Combined Net Monthly Income: $[________]

Parent 1's Percentage of Combined Net Income: [________]%

Parent 2's Percentage of Combined Net Income: [________]%

6. Basic Support Obligation

7. Additional Expenses

Total Support Obligation (Basic + Additional):

8. Parenting Time Adjustment

☐ Not applicable -- non-custodial parent has fewer than 146 overnights/year (standard calculation)

☐ Shared parenting applies -- 146 or more overnights/year

Adjusted Monthly Child Support After Shared Parenting Calculation: $[________]

9. Deviation Factors

☐ No deviation requested

☐ Deviation requested -- Check all applicable factors:

• ☐ Extraordinary medical expenditures
• ☐ Additional expenses incurred for the child (educational, extracurricular)
• ☐ Financial resources and needs of the child
• ☐ Financial resources and needs of the parents
• ☐ Standard of living the child would have enjoyed absent dissolution
• ☐ Physical and emotional condition of the child
• ☐ Educational needs of the child
• ☐ Other factors the court determines relevant: [________________________________]

Requested deviation amount: $[________]/month

Justification: [________________________________]

10. Duration and Modification

Support Commencement Date: [__/__/____]

Termination Events:

• ☐ Child reaches age 18 (or 19 if still in high school)
• ☐ Child becomes emancipated
• ☐ Child marries
• ☐ Child enters military active duty
• ☐ Child dies
• ☐ Other: [________________________________]

Post-Majority Educational Support (750 ILCS 5/513):

☐ Not applicable

☐ Contribution toward college/vocational education requested -- Amount: $[________]/month

Total Monthly Child Support Amount: $[________]

Payable by: ☐ Parent 1 ☐ Parent 2

Payment Method: ☐ Income Withholding ☐ Illinois State Disbursement Unit ☐ Direct Payment

11. Certification and Signatures

I declare under penalty of perjury under the laws of the State of Illinois that the foregoing information is true and correct to the best of my knowledge and belief.

Parent 1:

Signature: [________________________________]
Printed Name: [________________________________]
Date: [__/__/____]

Parent 2:

Signature: [________________________________]
Printed Name: [________________________________]
Date: [__/__/____]

Attorney for Parent 1 (if applicable):

Signature: [________________________________]
ARDC Number: [________________________________]
Date: [__/__/____]

Attorney for Parent 2 (if applicable):

Signature: [________________________________]
ARDC Number: [________________________________]
Date: [__/__/____]

12. Sources and References

• 750 ILCS 5/505 (Child Support; Contempt; Penalties)
• 750 ILCS 5/505.1 (Income Shares; Schedule)
• 750 ILCS 5/505.2 (Standardized Worksheets)
• 750 ILCS 5/510 (Modification and Termination)
• 750 ILCS 5/513 (Support for Non-Minor Children -- Educational Expenses)
• Illinois Schedule of Basic Child Support Obligations (updated annually)
• Illinois Gross-to-Net Income Conversion Table
• Illinois Department of Healthcare and Family Services: https://www.illinois.gov/hfs/ChildSupport

Illinois uses a net-income approach within the Income Shares model. The Schedule of Basic Child Support Obligations and Gross-to-Net Income Conversion Table are updated annually. Section 513 uniquely allows courts to order educational support for non-minor children attending college or vocational school.