Child Support Calculation Worksheet - Illinois
Before use: Illinois HFS adopts the child support guidelines and worksheets under 750 ILCS 5/505(a)(1). Use this worksheet to organize figures, then check the current HFS worksheet and the court's filing instructions before submitting a calculation.
CHILD SUPPORT CALCULATION WORKSHEET
State of Illinois -- Income Shares Model
750 ILCS 5/505(a)(1)
Table of Contents
- Case Information
- Identification of Children
- Gross Income Determination
- Standardized Tax and Deductions
- Net Monthly Income
- Basic Support Obligation
- Additional Expenses
- Parenting Time Adjustment
- Deviation Factors
- Duration and Modification
- Certification and Signatures
- Sources and References
1. Case Information
| Field | Entry |
|---|---|
| Court Name | [________________________________] |
| Case Number | [________________________________] |
| Petitioner (Parent 1) | [________________________________] |
| Respondent (Parent 2) | [________________________________] |
| Date of Worksheet | [__/__/____] |
| Prepared By | [________________________________] |
2. Identification of Children
| # | Full Legal Name | Date of Birth | Age |
|---|---|---|---|
| 1 | [________________________________] | [__/__/____] | [____] |
| 2 | [________________________________] | [__/__/____] | [____] |
| 3 | [________________________________] | [__/__/____] | [____] |
| 4 | [________________________________] | [__/__/____] | [____] |
Total Number of Children Subject to This Order: [____]
3. Gross Income Determination
3A. Monthly Gross Income
| Income Source | Parent 1 ($) | Parent 2 ($) |
|---|---|---|
| Wages / Salary | [________] | [________] |
| Overtime | [________] | [________] |
| Commissions / Bonuses | [________] | [________] |
| Self-Employment Income | [________] | [________] |
| Interest / Dividends | [________] | [________] |
| Unemployment / Workers' Compensation | [________] | [________] |
| Disability Benefits | [________] | [________] |
| Social Security Benefits | [________] | [________] |
| Pensions / Annuities | [________] | [________] |
| Trust Income | [________] | [________] |
| Rental Income | [________] | [________] |
| Spousal Maintenance Received | [________] | [________] |
| Other: [________________] | [________] | [________] |
| TOTAL MONTHLY GROSS INCOME | $[________] | $[________] |
3B. Imputed Income (If Applicable)
☐ Parent 1 voluntarily unemployed/underemployed -- Imputed income: $[________]/month
☐ Parent 2 voluntarily unemployed/underemployed -- Imputed income: $[________]/month
4. Standardized Tax and Deductions
| Deduction | Parent 1 ($) | Parent 2 ($) |
|---|---|---|
| Federal Income Tax | [________] | [________] |
| State Income Tax | [________] | [________] |
| FICA (Social Security and Medicare) | [________] | [________] |
| Mandatory Retirement Contributions | [________] | [________] |
| Mandatory Union Dues | [________] | [________] |
| Health Insurance Premiums (parent only) | [________] | [________] |
| Prior Court-Ordered Support Payments | [________] | [________] |
| Necessary Medical Expenditures | [________] | [________] |
| TOTAL DEDUCTIONS | $[________] | $[________] |
5. Net Monthly Income
| Calculation | Parent 1 ($) | Parent 2 ($) |
|---|---|---|
| Total Monthly Gross Income (from 3A) | [________] | [________] |
| Less: Total Deductions (from Section 4) | ([________]) | ([________]) |
| NET MONTHLY INCOME | $[________] | $[________] |
Combined Net Monthly Income: $[________]
Parent 1's Percentage of Combined Net Income: [________]%
Parent 2's Percentage of Combined Net Income: [________]%
6. Basic Support Obligation
| Item | Amount ($) |
|---|---|
| Combined Net Monthly Income | [________] |
| Number of Children | [____] |
| Basic Support Obligation (from Schedule) | $[________] |
| Parent 1's Share ([________]%) | $[________] |
| Parent 2's Share ([________]%) | $[________] |
7. Additional Expenses
| Expense | Monthly Cost ($) | Parent 1 Share ($) | Parent 2 Share ($) |
|---|---|---|---|
| Work-Related Childcare | [________] | [________] | [________] |
| Health Insurance Premiums for Child(ren) | [________] | [________] | [________] |
| Unreimbursed/Uninsured Medical Expenses | [________] | [________] | [________] |
| Extracurricular Activities | [________] | [________] | [________] |
| School-Related Expenses | [________] | [________] | [________] |
| Other: [________________] | [________] | [________] | [________] |
| TOTAL ADDITIONAL EXPENSES | $[________] | $[________] | $[________] |
Total Support Obligation (Basic + Additional):
| Parent 1 ($) | Parent 2 ($) | |
|---|---|---|
| Basic Support Share | [________] | [________] |
| Additional Expense Share | [________] | [________] |
| TOTAL OBLIGATION | $[________] | $[________] |
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
| Parent | Number of Overnights | Percentage of Overnights |
|---|---|---|
| Parent 1 | [________] | [________]% |
| Parent 2 | [________] | [________]% |
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(a)(1) (Child support guidelines and worksheets)
- 750 ILCS 5/505.2 (Health insurance)
- 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.
About this template
- Last updated
- October 13, 2026
- Jurisdiction
- Illinois
- Category
- Family Law
Legal authority
- 750 ILCS 5/505(a)(1) (Child support guidelines and worksheets)
- 750 ILCS 5/505.2 (Health insurance)
- 750 ILCS 5/510 (Modification)
- 750 ILCS 5/513 (Support for Non-Minor Children)
Family law covers the paperwork that shapes divorce, custody, child support, adoption, guardianship, and other family matters. These filings are emotional and high-stakes, and they also have to meet strict procedural rules for service, financial disclosure, and parenting plans. Clean, accurate paperwork keeps the focus on getting a workable outcome for the family instead of getting derailed by technical problems that delay hearings or force amended filings.
Not legal advice
This template is provided for informational purposes. We recommend having an attorney review any legal document before signing, especially for high-value or complex matters.
Checked against the law it cites
The statutes this template relies on are listed under Legal authority.
750 ILCS 5/505(a)(1) (checked October 13, 2026): "The Illinois Department of Healthcare and Family Services shall adopt rules establishing child support guidelines which include worksheets to aid in the calculation of the child support obligations and a schedule of basic child support obligations"
750 ILCS 5/505.1(a) (checked October 13, 2026): "Whenever it is determined in a proceeding to establish or enforce a child support or maintenance obligation that the person owing a duty of support is unemployed, the court may order the person to seek employment and report periodically to the court"
750 ILCS 5/505.2(d) (checked October 13, 2026): "The dollar amount of the premiums for court-ordered health insurance, or that portion of the premiums for which the insurance obligor is responsible in the case of insurance provided under a group health insurance plan through an employer or labor union or trade union where the employer or labor union or trade union pays a portion of the premiums, shall be considered an additional child support obligation."
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