Spousal Maintenance (Alimony) in Cook County, Illinois

In Cook County divorce cases, you often address spousal maintenance—known in other states as alimony. Maintenance helps a lower-earning spouse maintain a standard of living similar to what they had during the marriage. Since 2015, Illinois has used a guideline formula to calculate both the amount and duration of maintenance, while still allowing judges discretion in certain situations.

How Illinois Calculates Maintenance

For most couples with a combined gross income under $500,000, and no prior support obligations for the paying spouse, Illinois courts apply a standard formula:

Step 1: Calculate the maintenance amount

  • Take one-third (33.3%) of the higher-earning spouse’s net income
  • Subtract one-quarter (25%) of the lower-earning spouse’s net income
  • The result gives the presumptive annual maintenance amount

Step 2: Apply the 40% cap
The court ensures that the receiving spouse’s income plus maintenance does not exceed 40% of the couple’s combined net income. If it does, the court reduces the amount to meet that limit.

How Courts Determine Duration

Illinois also sets guidelines for how long maintenance lasts based on the length of the marriage:

  • 0–5 years: 20% of the marriage length
  • 5–6 years: 24%
  • The percentage increases by 4% for each additional year
  • 19–20 years: 80%
  • 20+ years: the court may award maintenance for a term equal to the length of the marriage or indefinitely

Courts calculate the duration by multiplying the length of the marriage by the applicable percentage.

When Courts Deviate From the Guidelines

Judges do not always follow the formula. They step outside the guidelines when:

  • Combined income exceeds $500,000
  • The formula leads to an unfair or unreasonable result
  • A spouse’s health, age, or ability to become self-supporting changes the outcome

In these cases, the court evaluates several factors, including:

  • Each spouse’s income, property, and financial resources
  • Each party’s needs and earning ability
  • Any reduction in earning capacity due to childcare or household responsibilities
  • The time needed for a spouse to gain education or employment
  • The standard of living during the marriage
  • Each party’s age and physical and emotional health
  • Tax consequences of maintenance
  • Any valid agreements between the spouses

Why Legal Guidance Matters

Maintenance calculations and negotiations can become complex quickly. If you are going through a divorce in Cook County, an experienced divorce attorney can help you understand your rights, apply the guidelines correctly, and work toward a fair outcome.