Illinois Alimony Laws 2026
Complete guide to spousal support in Illinois
Illinois Alimony at a Glance
Types Available
Maximum Duration
Guidelines: % of marriage length
How Courts Calculate
33% of payor income - 25% of payee income
Understanding Illinois Alimony Law
In Illinois, alimony (also called spousal support or spousal maintenance) is financial support paid by one spouse to the other following a divorce or separation. Illinois has a statutory formula and duration guidelines.
Illinois courts generally consider the following factors when determining alimony:
- The length of the marriage
- Each spouse's income and earning capacity
- The standard of living established during the marriage
- Each spouse's age, health, and employability
- Contributions to the marriage (including homemaking)
- Child custody arrangements and their impact on earning capacity
- Marital misconduct or fault (in some cases)
Types of Alimony in Illinois
Maintenance: Available under Illinois law based on the specific circumstances of each case.
Duration of Alimony
In Illinois, the duration of alimony awards is: Guidelines: % of marriage length.
Modifying or Terminating Alimony
In most cases, alimony in Illinois can be modified or terminated upon a showing of a substantial change in circumstances, such as:
- Significant increase or decrease in either party's income
- Recipient spouse's remarriage
- Recipient spouse's cohabitation with a new partner (in many states)
- Either party's retirement
- Death of either party
Estimate Your Illinois Alimony
Use our calculator to get a rough estimate based on Illinois guidelines.
Disclaimer: This information is for educational purposes only and does not constitute legal advice. Laws change frequently. Consult a licensed Illinois family law attorney for advice specific to your situation.