Last Updated on August 24, 2026 by Abdul Rehman
Getting divorced in Illinois involves more than filing paperwork. State law governs residency, grounds for divorce, property division, maintenance, child support, and parenting decisions. Under Illinois divorce laws, a spouse generally needs 90 days of Illinois residency before the court enters a dissolution judgment.
Illinois is a no-fault state, so irreconcilable differences are the only ground for divorce. Property is divided equitably, not automatically 50/50. Maintenance, child support, and parenting decisions depend on statutory formulas, legal factors, and the facts of the case.
| Key issue | Illinois rule |
|---|---|
| Divorce ground | Irreconcilable differences |
| Residency | Generally 90 days before the court enters judgment |
| Six-month separation | Creates a legal presumption of irreconcilable differences; it is not a universal six-month filing wait |
| Property division | Equitable division in “just proportions,” not an automatic 50/50 split |
| Spousal maintenance | Eligibility depends on statutory factors; guidelines apply in qualifying cases |
| Child support | Uses an income-shares model based largely on bothparents’’ incomes |
| Parenting decisions | Based on the child’s best interests |
| Filing forms | Statewide approved divorce forms are available through Illinois Courts |
Table of Contents
Key Takeaways
- Illinois uses no-fault divorce, with irreconcilable differences as the statutory ground.
- You do not always need to live separately for six months before filing.
- Marital property is divided fairly according to statutory factors, not necessarily equally.
- Maintenance and child support follow different rules and calculations.
- Courts decide parenting responsibilities and parenting time based on a child’s best interests.
- Uncontested cases tend to move more quickly than disputes involving property, money, or children.
Illinois Divorce Laws: Filing Requirements and the Six-Month Rule
Illinois calls divorce a “dissolution of marriage.” At least one spouse must satisfy the state’s 90-day residency or military-presence requirement before a court can enter the judgment.
Illinois recognizes irreconcilable differences as the sole ground for dissolution. A common source of confusion is the six-month separation provision. Illinois law states that spouses who live separate and apart for at least six continuous months create an irrebuttable presumption that irreconcilable differences exist.
That rule does not mean every couple must wait six months before filing for or obtaining a divorce. If the spouses have not been separated for six months, a judge may still find that irreconcilable differences exist based on the evidence. The court must also find that attempts at reconciliation have failed or that further attempts would not serve the family’s best interests.
You generally file the case in an appropriate Illinois county connected to either spouse. Illinois Legal Aid advises filers to check local court requirements, as procedures and filing costs can vary by county.
How Illinois Divides Property and Debt
Illinois follows equitable distribution rather than an automatic equal split. The Illinois Marriage and Dissolution of Marriage Act directs courts to divide marital property in “just proportions” after considering the statutory factors.
Marital property generally includes property and debts acquired during the marriage. Certain assets may remain non-marital, including qualifying property owned before marriage and some property received by gift, legacy, or inheritance. Classification can become difficult when marital and separate funds have been mixed.
A court may consider factors such as each spouse’s contributions, the value of the property, the length of the marriage, each spouse’s economic circumstances, and obligations from prior marriages. Marital misconduct itself is not a basis for dividing property.
Accurate valuations matter when a marital estate includes a home, business, investment property, or another major asset. Readesh’s discussion of why divorce settlement appraisals matter in property division provides additional context for the role of valuations in settlement negotiations.
How Spousal Maintenance Works
Spousal maintenance, often called alimony, is not automatic. A court first decides whether maintenance is appropriate based on the factors outlined in Illinois law. Those factors include income, property, needs, earning capacity, the length of the marriage, and other financial circumstances.
When the statutory guidelines apply, Illinois generally uses a formula based on the spouses’ net incomes. For qualifying cases, the calculation starts with 33⅓% of the payer’s net annual income minus 25% of the recipient’s net annual income. The resulting maintenance amount, combined with the recipient’s net income, generally cannot exceed 40% of the spouses’ combined net income.
The guideline generally applies when the spouses’ combined gross annual income is below $500,000, and the payer has no specified prior family-support obligation. Courts may depart from the guidelines when permittedwhen permitted by law, but they must explain the required findings.
Duration also depends heavily on the length of the marriage. Illinois uses statutory percentages for many marriages lasting less than 20 years. For a marriage of 20 years or more, the court may order maintenance for a period equal to the length of the marriage or for an indefinite term.
Child Support, Parenting Time, and Parental Responsibilities
Illinois uses the term allocation of parental responsibilities for major decisions involving a child. These responsibilities may cover education, health, the child’s religion, and extracurricular activities. A judge allocates them in accordance with the child’s best interests.
A child’s time is also decided under a best-interest standard. Courts consider the child’s needs, each parent’s taking, the parents’ wishes, the child’s adjustment, the distance between the parents’ homes, and any history of violence or abuse.
Illinois parental support generally uses an income-shares model. The calculation considers both parents’ net incomes and the number of children, then applies state support guidelines. Parenting schedules can also affect the calculation in qualifying shared-parenting situations.
Parents should think about how the dispute may affect their children outside the courtroom. Readesh’s guide to supporting children through family disputes discusses ways parents can reduce the pressure placed on children during conflict.
Digital conduct can also become relevant. Posts, photographs, messages, or other online activity may become evidence in a family-law dispute. Readesh explains the issue further in its article on the impact of social media on divorce cases.
How to File for Divorce in Illinois
The details differ from case to case, but the basic filing process usually follows these stages:
- Confirm residency and the correct county. Make sure the Illinois residency requirement will be satisfied and identify the appropriate circuit court.
- Choose the correct forms. Illinois Courts publishes approved statewide divorce forms, including separate materials for cases with and without minor children.
- File the petition and required documents. Depending on your circumstances and local rules, filing may occur electronically or through another approved court process.
- Provide legal notice to your spouse. Unless your spouse properly waives service, the case requires a formal notice process.
- Resolve financial and parenting issues. The spouses may reach an agreement, or the judge may decide disputed matters.
- Attend the final hearing and obtain a judgment. The marriage ends when the court enters the judgment for dissolution.
State-approved forms help self-represented litigants, but forms cannot resolve every legal problem. Illinois Legal Aid recommends considering a lawyer when spouses disagree about children, significant property, debts, support, abuse, or other contested issues.
How Long Does an Illinois Divorce Take?
There is no single statewide timeline that applies to every case. Illinois does not impose a general six-month waiting period before a divorce can be entered once the legal requirements are met.
An uncontested case can move more quickly because the spouses have resolved their main issues. A contested case typically takes longer when the court must address discovery, property valuations, support, parenting disputes, or trial preparation. Court schedules also matter. The practical timeline can vary by county and by the number of unresolved issues.
How Much Does Filing Cost?
Illinois does not have one statewide filing fee for every divorce case. Filing and service fees can differ among circuit courts, so you should check the correct amount with the court handling the case. People who cannot afford court fees may request a fee waiver. Attorney fees, appraisals, financial experts, mediation, and other professional costs are separate from the court filing fee.
The biggest difference in cost often comes from the level of disagreement. Cases resolved through a negotiated settlement usually require less litigation than cases involving disputed assets, parenting arrangements, or support.
What to Do Before You File
Start by listing your assets, debts, income sources, monthly expenses, insurance policies, and any issues involving your children. Collect recent financial records before negotiations begin. Next, confirm the forms and filing procedures required by your circuit court. If property, support, parenting, or safety is disputed, consider getting advice from an Illinois family-law attorney before signing a settlement.
For more practical legal explainers, browse the Readesh Law section.
Frequently Asked Questions
No. Six months of continuous separation creates a statutory presumption that irreconcilable differences exist. It is not a blanket rule requiring every couple to wait six months before filing for or receiving a divorce.
Not automatically; Illinois uses equitable distribution. A court divides marital property in “just proportions” after considering statutory factors, so an appropriate division does not have to be exactly equal.
Illinois is a no-fault state. The statutory ground is irreconcilable differences, not adultery. Marital misconduct is also excluded as a basis for property division and maintenance decisions, although conduct that affects marital finances can raise separate property issues.
Yes, some people represent themselves. Illinois courts provide approved forms that courts must accept. Legal advice can be valuable when the case involves children, contested property, debts, support, domestic violence, or a spouse who has legal counsel.
Illinois Courts provides statewide approved divorce forms and instructions. The correct set depends in part on whether the spouses have minor children together. Local circuit courts may also have filing instructions that must be followed.
