How Does Divorce Work in Illinois?

June 26, 2026

How Does Divorce Work in Illinois? A Step-by-Step Guide

Intro:

Divorce — formally called the dissolution of marriage in Illinois — is a legal process that formally ends a marriage and resolves the issues of property, support, and parental responsibilities that arise when a couple separates. The process can be relatively straightforward in uncontested cases or complex and contested in others. This guide walks through the key stages.

Step 1 — Meeting the Residency Requirement

At least one spouse must have been a resident of Illinois for a minimum of 90 days before filing for divorce. The case is typically filed in the county where either spouse resides.

Step 2 — Grounds for Divorce

Illinois is a no-fault divorce state. The sole ground for divorce is irreconcilable differences — meaning the marriage has broken down irretrievably. You do not need to prove fault, adultery, or wrongdoing. If both spouses agree the marriage is over, the process moves significantly faster.

Step 3 — Filing the Petition

The process begins when one spouse (the petitioner) files a Petition for Dissolution of Marriage with the appropriate circuit court. The other spouse (the respondent) is then served with the petition and has an opportunity to respond.

Step 4 — Resolving Key Issues

The most time-consuming aspect of divorce is resolving the substantive issues, which may include:

  • Division of marital property and debts (Illinois follows equitable distribution)
  • Allocation of parental responsibilities (formerly called custody) and parenting time
  • Child support (calculated under Illinois income shares guidelines)
  • Spousal maintenance (alimony), if applicable
  • Division of business interests, retirement accounts, and investments

Step 5 — Uncontested vs. Contested Divorce

If both spouses agree on all issues, they can submit a Marital Settlement Agreement and Parenting Plan to the court for approval — an uncontested divorce that can sometimes be finalized in as little as a few months. If disputes remain, the case proceeds through discovery, potential mediation, and ultimately trial if no resolution is reached.

Step 6 — Final Decree

Once all issues are resolved — either by agreement or court ruling — the judge enters a Judgment for Dissolution of Marriage. This is the final order that legally ends the marriage and governs the ongoing obligations of each party.\

How Angelini & DiLeo Law Can Help

Whether your divorce is straightforward or fiercely contested, having experienced counsel ensures your rights are protected at every step. Our Chicago family law attorneys represent clients throughout Cook and DuPage Counties with the strategy and discretion that sensitive family matters demand. Schedule a confidential consultation at 312.900.0100.

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