Understanding Illinois Maintenance Calculations

December 03, 2025

Understanding Illinois Maintenance Calculations

Illinois Maintenance Formula Explained

Illinois maintenance calculations follow specific statutory guidelines. Understanding these formulas helps divorcing spouses plan for their financial future.

The Calculation

Maintenance is calculated as:

  • 33.33 percent of the paying spouse net income
  • minus 25 percent of the receiving spouse net income
  • However the total cannot exceed 40 percent of combined net income.

    Duration Guidelines

    Maintenance duration depends on the length of the marriage.

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