What to Expect When Filing for Divorce in Cook County

Divorce is one of the most significant legal events a person can go through — and for many residents of Arlington Heights, Des Plaines, and the surrounding northwest suburbs, the process feels overwhelming before it even begins. What forms do you file? Which courthouse handles your case? How long will it take?

This guide walks you through the Illinois divorce process from start to finish, so you know what to expect at every stage.

Illinois Is a No-Fault Divorce State

The first thing to understand is that Illinois eliminated fault-based divorce in 2016. Today, the only legal ground for divorce in Illinois is "irreconcilable differences" — meaning the marriage has broken down irreparably and reconciliation is not possible.

You do not need to prove that your spouse did anything wrong. You simply need to demonstrate that the marriage has broken down. If you and your spouse have lived separately for at least six months, Illinois law presumes that irreconcilable differences exist.

This change has simplified the process significantly, but it does not mean divorce is simple. Property division, custody, and support issues still require careful legal attention.

Residency Requirements

Before you can file for divorce in Illinois, at least one spouse must have lived in the state for a minimum of 90 days. If you live in Arlington Heights, Des Plaines, Schaumburg, or anywhere else in Cook County, you meet this requirement as long as you've been a resident for at least three months.

Your case will be filed in the Circuit Court of Cook County. Depending on where you live, your case may be heard at the Domestic Relations Division in Chicago or at one of the suburban district courthouses.

Step 1: Filing the Petition for Dissolution of Marriage

The divorce process begins when one spouse (the "petitioner") files a Petition for Dissolution of Marriage with the Circuit Court. The petition sets out basic information about the marriage, the parties, any children, and the relief being requested.

Along with the petition, you'll typically file:

• A Summons (to formally notify your spouse)
• A Civil Case Cover Sheet
• A Financial Affidavit (required in cases involving property or support)
• A Parenting Plan or Allocation Judgment (if children are involved)

Filing fees in Cook County currently run several hundred dollars, though fee waivers are available for those who qualify based on income.

Step 2: Serving Your Spouse

After filing, your spouse must be formally served with the divorce papers. This is called "service of process." In most cases, a process server or the Cook County Sheriff's office delivers the documents.

If your spouse is cooperative, they can sign an "Entry of Appearance" form, which waives formal service and speeds up the process considerably. Many uncontested divorces in the northwest suburbs proceed this way.

Once served, your spouse has 30 days to file a response.

Step 3: Financial Disclosure

Illinois requires both spouses to exchange financial disclosures early in the process. This includes information about income, assets, debts, and expenses. The purpose is to ensure that both parties have a complete picture of the marital estate before negotiating a settlement.

This step is critical. Incomplete or inaccurate financial disclosures can derail a settlement and, in some cases, expose a party to sanctions from the court. An experienced attorney will help you gather and organize the necessary documentation.

Step 4: Negotiating a Settlement (or Proceeding to Trial)

The majority of divorces in Cook County — including those in Arlington Heights and Des Plaines — are resolved through negotiated settlements rather than trials. The parties, with the help of their attorneys, work out agreements on:

• Property division: Illinois follows the principle of "equitable distribution," meaning marital property is divided fairly, though not necessarily equally.
• Spousal maintenance (alimony): Whether one spouse will pay support to the other, and for how long.
• Parental responsibilities (custody): Who makes major decisions for the children, and what the parenting time schedule looks like.
• Child support: Calculated under Illinois guidelines based on both parents' incomes and the parenting time arrangement.

If the parties cannot reach agreement, the case proceeds to trial, where a judge decides the unresolved issues.

Step 5: The Prove-Up Hearing

Once a settlement is reached, the parties attend a brief court hearing called a "prove-up." At this hearing, the petitioner confirms the basic facts of the case under oath, and the judge reviews and approves the Marital Settlement Agreement and any Parenting Plan.

If everything is in order, the judge enters the Judgment for Dissolution of Marriage — and the divorce is final.

How Long Does Divorce Take in Cook County?

The timeline varies significantly depending on whether the divorce is contested or uncontested.

• Uncontested divorce (both parties agree on all issues): As little as 60–90 days from filing, assuming the court's schedule allows.
• Contested divorce (disputes over property, custody, or support): Typically 12–24 months, and sometimes longer for complex cases.

Cook County's Domestic Relations Division handles a high volume of cases, which can affect scheduling. Having an attorney who is familiar with the local courts and procedures can help move your case forward efficiently.

What About Children?

If you have minor children, the divorce process involves additional steps. Illinois uses the term "parental responsibilities" rather than "custody," and the court's primary concern is always the best interests of the child.

You will need to submit a Parenting Plan that addresses:

• Decision-making authority (major decisions about education, healthcare, religion)
• Parenting time (the schedule for when each parent has the children)
• Holiday and vacation schedules
• Communication between parents

If you and your spouse cannot agree on a parenting plan, the court may appoint a Guardian ad Litem or a Child Representative to advocate for the children's interests.

Common Mistakes to Avoid

Many people going through divorce in the northwest suburbs make avoidable mistakes that complicate the process or harm their long-term interests. The most common include:

• Moving out of the marital home without legal advice: This can affect your property rights and, in some cases, your parenting time.
• Posting on social media: Anything you post can potentially be used against you in court.
• Hiding assets: Illinois courts take financial disclosure seriously. Concealing assets can result in sanctions and an unfavorable property division.
• Agreeing to terms without understanding them: Settlement agreements are binding. Make sure you understand what you're signing before you sign it.

Working With a Local Family Law Attorney

Navigating the Cook County court system is far easier with an attorney who knows it well. At Villadonga & Villadonga, our family law team has guided hundreds of northwest suburban families through the divorce process — from straightforward uncontested cases to complex contested matters involving significant assets or difficult custody disputes.

We serve clients in Arlington Heights, Des Plaines, Schaumburg, Mount Prospect, and throughout Cook County. Our office is located in Mount Prospect, making us convenient for families across the northwest suburbs.

If you're considering divorce or have already been served with divorce papers, schedule a consultation with our family law team to discuss your situation and understand your options.