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Illinois Child Support Modifications: How can one request a change in child support?

Understanding Illinois Child Support Modifications

In Illinois, child support is a crucial aspect of ensuring that the financial needs of children are met following the dissolution of a marriage or a relationship where parents are not together. However, circumstances can change, necessitating a review and potential modification of the initial child support order. Under Illinois law, either parent can request a change in child support when there has been a significant change in circumstances.

Criteria for Modifying Child Support

For a child support order to be modified, the requesting party must demonstrate that a substantial change in circumstances has occurred since the last order was established. Such changes might include:

It should be noted that Illinois uses the 'Income Shares' model for calculating child support, which takes into account both parents' incomes and the amount of parenting time each parent has with the child(ren).

How to Request a Modification

To initiate a modification, the parent seeking the change must file a petition with the court that issued the original child support order. This process involves:

  1. Filling out the appropriate forms, including a Financial Affidavit and a Petition for Modification of Child Support.
  2. Serving papers to the other parent, providing them with notice of the requested modification.
  3. Attending a court hearing where both parties can present evidence supporting their positions on the proposed modification.

In some cases, if both parents are in agreement about the changes, they can jointly submit a signed agreement to the court for approval. However, even in these situations, the court has to ensure that the agreement is in the best interest of the child before approving it.

Legal Precedents and Historical References

Historically, Illinois courts have emphasized that child support is for the benefit of the child and modifications should reflect what is best for their welfare. For instance, in In re Marriage of S.D. and M.D. (2010), an Illinois appellate court ruled that modifications to child support must prioritize children's needs and uphold their standard of living as much as possible post-divorce.


Navigating child support modifications requires understanding legal criteria and following procedural steps accurately. Parents considering such modifications should consult legal experts to ensure compliance with Illinois laws and to advocate effectively for their children’s financial interests. Remember, changes in child support are not automatic; they require legal action to take effect.