Navigating divorce in the Prairie State requires a clear understanding of financial obligations. Our Illinois Maintenance Calculator is designed to provide an instant estimate of spousal support based on the updated 750 ILCS 5/504 statutory guidelines.
Estimate Spousal Support
Income Allocation Visualizer
A) What is the Illinois Maintenance Calculator?
The Illinois Maintenance Calculator is a tool designed to help divorcing couples and legal professionals estimate "alimony" or spousal support payments. In Illinois, maintenance is not automatic; the court must first determine if maintenance is appropriate. Once deemed necessary, the state provides a specific formula for couples whose combined gross annual income is less than $500,000.
This calculator applies the 2019 statutory amendments, which shifted the focus from gross income to net income to align with modern tax laws.
B) The Statutory Formula and Explanation
Under 750 ILCS 5/504, the standard calculation for the amount of maintenance is:
However, there is a critical "Cap" rule. The amount of maintenance, when added to the payee’s net income, cannot exceed 40% of the combined net income of both parties.
The Duration Formula
The length of time maintenance is paid depends on how long the marriage lasted. The state uses a multiplier system:
| Length of Marriage | Multiplier (Duration) |
|---|---|
| Less than 5 years | 0.20 |
| 5 - 6 years | 0.24 |
| 10 - 11 years | 0.44 |
| 15 - 16 years | 0.64 |
| 20+ years | 1.00 (or permanent) |
C) Practical Examples
Example 1: The Standard Case
John earns $100,000 net annually, and Jane earns $40,000 net. They were married for 10 years.
- 33.3% of John's income: $33,300
- 25% of Jane's income: $10,000
- Base Maintenance: $23,300/year
- Check Cap: ($23,300 + $40,000) = $63,300. 40% of combined ($140k) is $56,000.
- Final Result: $16,000/year (Adjusted by 40% cap).
Example 2: Long-Term Marriage
A couple married for 20 years with a $150,000 payor income and $0 payee income would likely result in permanent maintenance or support lasting the full length of the marriage (20 years).
D) How to Use This Calculator Step-by-Step
- Enter Net Incomes: Input the annual income after taxes for both the higher-earning spouse (Payor) and the lower-earning spouse (Payee).
- Input Marriage Length: Enter the number of years from the date of marriage to the date the divorce was filed.
- Review Duration: The calculator automatically applies the statutory multiplier to show how many years the payments will last.
- Analyze Results: View the monthly and annual breakdowns, including any adjustments for the 40% income cap.
E) Key Factors Influencing Maintenance
While the calculator provides a statutory starting point, Illinois judges may deviate from these guidelines based on:
- The standard of living established during the marriage.
- The age, health, and employability of each party.
- The time needed for the payee to acquire education or training.
- Valid tax consequences of the payments.
- Any valid prenuptial or postnuptial agreements.