Divorce Residency Requirements in Illinois (2026): The 90-Day Rule Explained

Illinois requires that at least one spouse live in the state for 90 days before the court enters a final divorce judgment under 750 ILCS 5/401. Only one spouse must meet this rule. The 90-day clock runs to the date of judgment, not the filing date, so you may file your petition before the 90 days end. Filing fees range from about $337 to $388.

The divorce residency requirements Illinois imposes are among the most flexible in the United States. Unlike states demanding six months or a full year of residence before you can even file, Illinois lets you file immediately and satisfy the 90-day domicile requirement while your case proceeds. This guide explains the residency statute, venue rules, filing jurisdiction, military exceptions, and 2026 court costs in precise detail.

Key Facts: Illinois Divorce at a Glance

Filing fees noted as of June 2026. Verify with your local clerk before filing.

How Long Must You Live in Illinois Before Divorce?

You must live in Illinois for 90 days before the court enters a final divorce judgment, under 750 ILCS 5/401. Only one spouse needs to satisfy this 90-day domicile requirement, not both. Critically, the 90-day clock runs to the date of judgment, not the date you file, so the petition can be filed before the period is complete.

This distinction matters enormously for timing. Many people ask how long to live in state before divorce and assume they must wait three months before doing anything. That is incorrect in Illinois. You may file a Petition for Dissolution of Marriage the day you establish residency, then let the 90 days accumulate while the case moves through discovery, negotiation, and scheduling. Because most contested Illinois divorces take far longer than 90 days to resolve anyway, the residency requirement rarely delays a final judgment. Illinois Legal Aid Online confirms there is no pre-filing waiting period under the statute. The residency rule exists to give Illinois courts subject-matter jurisdiction to dissolve the marriage, ensuring a genuine connection between at least one party and the state before a decree issues.

What the Domicile Requirement Actually Means

Illinois law requires domicile, not mere physical presence, meaning the spouse must reside in Illinois with the intent to remain. Under 750 ILCS 5/401, residency for 90 days establishes the court's authority. Domicile combines two elements: actual physical residence in the state plus the intention to make Illinois your permanent home.

The domicile requirement distinguishes a true resident from someone merely passing through. A person vacationing in Chicago for three months has physical presence but not domicile. By contrast, someone who moves to Illinois, signs a lease, registers to vote, obtains an Illinois driver's license, and intends to stay has established domicile from day one. The 90-day count then begins. In most uncontested cases, formal documentation is not required because the filing spouse verifies residency through a sworn statement within the Petition for Dissolution of Marriage. Illinois courts accept this signed writing as sufficient proof under normal circumstances. If a spouse challenges residency, however, the filing party may need to produce a driver's license, voter registration, tax returns, utility bills, lease agreements, or employment records to demonstrate that domicile in Illinois was genuinely established and maintained for the statutory 90-day period before judgment.

Filing Jurisdiction and Venue: Which County?

Illinois has no county-specific residency requirement, but you must file in the county where either spouse resides, under 750 ILCS 5/104. If both spouses live in different Illinois counties, either county's Circuit Court has proper venue and jurisdiction to hear the divorce.

Venue determines the correct courthouse, while the 90-day rule governs statewide jurisdiction. These are separate concepts that filers frequently confuse. The 90-day residency requirement applies to the state of Illinois as a whole, not to any individual county. You do not need to live in a particular county for any set time before filing there. Filing jurisdiction is satisfied simply by choosing a county where you or your spouse currently resides. For example, if you live in DuPage County and your spouse lives in Cook County, you may file in either DuPage or Cook. Practically, most petitioners file where they live for convenience. The Circuit Court of Cook County's Domestic Relations Division handles the largest divorce caseload in the state, processing tens of thousands of dissolution cases annually. Choosing the proper venue at the outset avoids motions to transfer and prevents procedural delays that can add weeks to your timeline.

Military Personnel and Residency

Military service members stationed in Illinois for 90 days or more satisfy the residency requirement under 750 ILCS 5/401, even if their legal home of record is another state. This provision lets active-duty personnel file for divorce where they are stationed without abandoning their out-of-state domicile.

The military residency rule recognizes a unique reality: service members are routinely assigned to Illinois bases such as Naval Station Great Lakes or Scott Air Force Base while retaining legal residence elsewhere for voting and tax purposes. Without this exception, a sailor stationed at Great Lakes for two years might be unable to divorce in Illinois despite living there continuously. The statute solves this by treating 90 days of stationed presence as equivalent to civilian domicile for divorce jurisdiction. Service members should also be aware of the federal Servicemembers Civil Relief Act, which allows active-duty defendants to request a stay of proceedings when military duties materially affect their ability to participate. This protection can pause a divorce for at least 90 days. Military divorces also involve specialized issues including the division of military pensions under the Uniformed Services Former Spouses' Protection Act and Survivor Benefit Plan elections, making experienced counsel valuable.

Illinois Grounds for Divorce: No-Fault Only

Illinois recognizes only one ground for divorce: irreconcilable differences that have caused the irretrievable breakdown of the marriage, under 750 ILCS 5/401. Illinois has been a pure no-fault state since January 1, 2016, when legislation eliminated all fault grounds like adultery, cruelty, and abandonment.

Under current law, no spouse must prove wrongdoing or assign blame. Either spouse can file unilaterally, and the other spouse's consent is not required to obtain the divorce. The statute directs the court to enter judgment when irreconcilable differences have caused the irretrievable breakdown and the court determines that reconciliation efforts have failed or that future attempts would be impracticable and not in the family's best interests. This represents a major shift from pre-2016 Illinois law, when parties litigated fault and could be forced to prove specific misconduct. A key feature is the 6-month separation presumption: if spouses live separate and apart for a continuous period of at least 6 months immediately before judgment, an irrebuttable presumption arises that irreconcilable differences exist. This is not a mandatory waiting period. In agreed cases where both spouses acknowledge the marriage is broken, no separation period is needed at all to obtain the divorce.

Understanding 'Separate and Apart'

Living 'separate and apart' for 6 months in Illinois does not require separate residences, under the interpretation of 750 ILCS 5/401. Spouses can satisfy this standard while living in the same home if they have stopped functioning as a married couple. Six continuous months apart creates an irrebuttable presumption of irreconcilable differences.

The leading authority is the Illinois case In re Marriage of Kenik, where the court held that 'separate and apart' is a state that can be realized without physical distance between the parties. The Kenik court concluded the spouses had lived separate and apart even though they remained under the same roof, because their marital relationship had effectively ended. This matters for economic reasons: many divorcing couples cannot afford two households while a case is pending. Illinois law accommodates that reality. To rely on the 6-month presumption, spouses must show they ceased the marital relationship, not merely that one slept in a guest room occasionally. Courts examine factors such as separate finances, ended intimacy, and the absence of shared social life as a couple. Importantly, in uncontested divorces where both parties agree the marriage is irretrievably broken, the 6-month period becomes irrelevant and the court can finalize the matter promptly without any separation evidence.

Illinois Divorce Filing Fees and Court Costs in 2026

Illinois divorce filing fees generally range from about $337 to $388 depending on the county, with Cook County charging $388 for the petitioner under its current schedule. The responding spouse pays a separate appearance fee, which is approximately $251 in Cook County. Combined initial costs in an uncontested Cook County case run about $639.

Filing fees vary by county because each Circuit Court Clerk sets its own schedule. As of June 2026, verify the exact amount with your local clerk, as fee schedules are periodically updated. Beyond the base filing and appearance fees, additional costs may include service of process. If the petition is served by the Cook County Sheriff rather than accepted by agreement, expect a fee of roughly $60. The table below breaks down typical Cook County costs.

Filing fees noted as of June 2026. Verify with your local clerk before filing. If you cannot afford court fees, every Illinois county must offer an Application for Waiver of Court Fees. Filers whose income falls below statutory thresholds, often tied to 125% of the federal poverty guidelines, may have all or part of their fees waived, removing a significant barrier to filing.

Property Division: Equitable, Not Equal

Illinois divides marital property by equitable distribution, not a 50/50 split, under 750 ILCS 5/503. Courts allocate marital assets and debts in just proportions after weighing statutory factors, while each spouse keeps their non-marital property. Equitable means fair, which does not always mean equal.

The property division type directly affects how residency and timing interact, because the date a divorce is filed can fix the cutoff for classifying certain assets and debts. Under 750 ILCS 5/503, the court considers factors including each spouse's contribution to acquiring the property, the duration of the marriage, the economic circumstances of each party, and any obligations from prior marriages. Non-marital property generally includes assets owned before marriage, inheritances, and gifts to one spouse, which remain that spouse's separate property. Marital property includes most assets acquired during the marriage regardless of whose name appears on the title. Because Illinois is an equitable distribution state rather than a community property state, outcomes are more discretionary, and the specific facts of contribution and need carry substantial weight. This makes accurate financial disclosure and, in complex estates, professional valuation essential to a fair result.