The following is a summary of Illinois child support laws, and is by no means intended to be an all-inclusive description of what to expect in your particular case. In some cases, the exact text of the statute may have been simplified and/or modified to provide for easier understanding. For a more specific understanding of the laws, you should consult the full Illinois Code and/or consult with an attorney about how the law might apply to your particular situation.

Child Support Guidelines.

Child support is determined by Illinois statutes. Those laws use a percentage of the paying spouse’s net income, after certain specified deductions, as the basis for the child support calculation:

  • 20% of net income for 1 child
  • 28% of net income for 2 children
  • 32% of net income for 3 children
  • 40% of net income for 4 children
  • 45% of net income for 5 children
  • 50% of net income for 6 or more children

-From Section 750 ICLS 5/505(a)1 of the Illinois Compiled Statutes

Deviation from Child Support Guidelines.

If the court deviates from these child support guidelines, it must make a written finding why the deviation is appropriate, based on the following laws:

  1. The financial resources and needs of the child;
  2. The financial resources and needs of the custodial parent;
  3. The standard of living the child would have enjoyed had the marriage not been dissolved;
  4. The physical and emotional condition of the child, and his educational needs; and
  5. The financial resources and needs of the non-custodial parent.

-From Section 750 ICLS 5/505(a)1 of the Illinois Compiled Statutes


Illinois Child Support Enforcement

Illinois Child Support Calculator


This information has been summarized from the Illinois statutes. You can find the full-text version of these and other Illinois divorce statutes online here: Illinois Divorce Laws.




IMPORTANT: Help Yourself Divorce is a paralegal service, not a law firm. Please don’t rely on this information for legal advice. Seek help from an attorney if you need legal advice.


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