Filing for divorce is rarely simple, even when both spouses agree it’s the right decision. Illinois divorce laws set their own rules for residency, property division, parenting arrangements, and timelines, which may differ from what you’ve heard about divorce in other states.
If you’re just starting to research your options or want to know how to file for divorce in Illinois, this guide will help you make informed decisions and avoid surprises later.
What Are the Divorce Laws in Illinois?
Here’s a quick snapshot of what you need to know about how to file for divorce in Illinois—five essentials that come up in nearly every case:
- No-fault state: Neither spouse has to prove wrongdoing.
- 90-day residency requirement: At least one spouse must live in Illinois for 90 days before a judgment can be entered.
- Equitable distribution: Marital property is divided fairly, not necessarily 50/50.
- Best interests of the child: This is the standard for all decisions around parenting responsibilities and child support. A parenting class is often mandatory when children under 18 are involved; requirements vary by county.
- Income shares model: Child support is calculated based on both parents’ incomes, plus additional factors.
We break down each of these in detail below.
How to File for Divorce in Illinois
Filing for divorce in Illinois follows a consistent process statewide. Each case has its own nuances, especially if aspects of the divorce are contested, but these are the basic steps:
- E-File a Petition for Dissolution of Marriage. Illinois requires electronic filing for civil cases statewide, including divorce. You’ll file with the circuit clerk in the county where you or your spouse resides. Some towns (including Naperville, Aurora, Bolingbrook, and Plainfield), are split across county lines, so confirm your jurisdiction before filing.
- Serve your spouse. Your spouse must be formally notified of the filing, typically through personal service by a sheriff or process server. Alternatively, your spouse can sign a notarized Waiver of Service.
- Exchange financial disclosures. Both spouses are required to complete sworn financial affidavits disclosing income, assets, and debts.
- Complete a parenting class, if you have minor children. This is required before a judgment can be entered.
- Reach a settlement or proceed to trial. Most cases resolve through negotiation or mediation rather than a full trial. Illinois state law requires mediation when parents can’t agree on a parenting plan, while in Cook and Will Counties, a judge can order mediation for any contested issue.
- Obtain a divorce decree. Once divorce terms are finalized, you’ll attend a prove-up hearing where a judge reviews and approves the agreement.
- Post-decree modifications. After the divorce is finalized, you can make changes to spousal maintenance, child support, or custody if circumstances have significantly changed.
Is Illinois a No-Fault Divorce State?
Yes; neither spouse has to prove wrongdoing to get a divorce in Illinois. Illinois eliminated fault-based divorce in 2016, so no one has to establish adultery, abandonment, or similar grounds. The only ground recognized under Illinois law is “irreconcilable differences,” meaning the marriage has broken down beyond repair and further attempts at reconciliation wouldn’t serve the family.
This doesn’t mean behavior is irrelevant to every part of the case. Fault doesn’t affect property division or spousal support, but conduct that directly harms a child, such as abuse or substance misuse, can still factor into decisions about parenting time.
For most couples, the no-fault system simplifies filing and keeps the process focused on resolving practical matters rather than assigning blame. It also means your spouse can’t block the divorce simply by refusing to agree. It may become a contested case that takes longer to resolve, but the court can still grant the divorce.
What Are the Residency Requirements to File for Divorce in Illinois?
One spouse must have lived in Illinois for at least 90 days before a judgment can be entered. There’s no waiting period to file a divorce petition, but the court can’t finalize the divorce until that residency period is met.
If children are involved, additional jurisdictional rules may apply, especially if the kids have lived in another state within the last six months. This is a common point of confusion in relocation situations. If this applies to you, we recommend scheduling a free consultation to discuss your filing requirements.
How Long Does an Illinois Divorce Take?
There’s no fixed timeline; it depends on whether the divorce is contested, how fast both sides agree on terms, and how complex the issues are.
- Uncontested divorces with an agreement already in place can sometimes close in just a few months.
- Couples who qualify for Joint Simplified Dissolution of Marriage (married 8 years or less, no minor children, no real estate, combined income under $60,000, and both spouses waiving maintenance) can move through an even faster, streamlined process available statewide.
- Contested divorces involving disputes over property, custody, or support can take a year or more, especially if they head to trial.
- Even straightforward-looking cases can stall. Missing financial records or last-minute disagreements over parenting terms are common causes of delay, so it’s realistic to build in some flexibility on timing.
- You don’t have to wait for the divorce to be finalized to get support or a parenting schedule in place. Either spouse can ask the court for temporary orders covering things like temporary support, parenting time, or who stays in the home while the case plays out.
- Location matters. The court’s schedule can affect your overall timeline. Cook County has one of the busiest family courts in the country, so cases there may take longer compared to a lower-volume district like Kane County.
At Mulyk Laho Law, we know every divorce case is unique. Our attorneys take the time to listen, understand your story, and guide you through your options. If a mediated resolution serves your interests, we pursue it efficiently. If a fight is necessary, our experienced divorce lawyers are ready for trial.
How Long Do You Have to Be Married to Get Spousal Support?
There’s no minimum length of marriage required to get spousal support (maintenance); it’s one factor among several. Illinois provides statutory guidelines for calculating the support amount and duration, though courts can deviate based on the specifics of a case.
Judges weigh factors including income and earning capacity; standard of living during the marriage; length of the marriage; and ability to become self-supporting, including time or training needed to re-enter the workforce.
Property division and spousal support are often confused, but they’re actually two separate issues. Property division decides what each spouse keeps, while spousal support decides whether one spouse pays the other ongoing income after the divorce.
How Is Property Divided in an Illinois Divorce?
Illinois follows an equitable distribution model, meaning it divides property based on what’s fair, not just a 50/50 split.
Courts weigh factors like each spouse’s income and earning potential, contributions to the marriage (including as a homemaker), the length of the marriage, and each spouse’s needs going forward. Marital property includes assets and debts acquired during the marriage, regardless of whose name is on the account or title.
Many couples reach a property settlement through negotiation or mediation rather than letting a judge decide, which tends to reduce both cost and conflict.
What Assets Are Off-Limits in a Divorce?
Property you owned before the marriage, or received individually as a gift or inheritance, is generally off-limits. Non-marital property that’s typically excluded from division includes:
- Assets owned before the marriage
- Inheritances, even if received during the marriage
- Gifts given specifically to one spouse
- Certain personal injury settlements
Tip: Non-marital property can lose its protected status if it’s “commingled” with marital assets—for example, depositing an inheritance into a joint account used for household expenses, or using shared funds to pay the mortgage for a house you already owned. Keeping separate assets clearly documented and separate is the best way to protect them.
What If You’ve Already Commingled Assets?
It’s not automatically fatal to a claim, but it does shift the burden to you to prove what’s actually separate. If you’re realizing this while considering a divorce, here are a few tips to keep in mind:
- Start tracing now. Any documents that show where the money originally came from can support treating it as non-marital, even after commingling. This can include bank statements, a deed, or an inheritance disbursement letter.
- Separate what’s left. Move any remaining separate funds into an account solely in your name, and keep clean records going forward. Partial protection is better than none.
- Track your contributions to jointly-titled property. If non-marital funds paid down a mortgage or funded renovations on a marital home, documenting those contributions can support a reimbursement claim later.
- Consider a postnuptial agreement. It can formally designate certain property as separate going forward, rather than relying on tracing records years down the line.
This is one area where getting ahead of the paperwork before you file can make a real difference in outcomes.
What If My Spouse Is Hiding Assets?
At Mulyk Laho Law, our divorce attorneys are backed by forensic accountants and investigators to ensure the numbers on paper match reality. If you think your spouse may be concealing money or property, here’s where to start:
- Watch for common warning signs. Unexplained changes in spending, new accounts you don’t recognize, a business that suddenly shows less income, or reluctance to share financial statements can all be red flags.
- Discovery gives you formal tools once a case is filed. Discovery is a part of the legal process where both spouses are required to share financial documents and information with each other during the case. Your attorney can use financial disclosures, subpoenas to banks and financial institutions, and depositions to require your spouse to account for assets, including cryptocurrency and other non-traditional assets.
- A forensic accountant can trace what you can’t. For complex finances or suspected hidden accounts, a forensic accountant can spot irregularities that aren’t visible from bank statements alone.
Even a hunch that something doesn’t fully add up is worth raising with your divorce attorney. We can help you figure out how much scrutiny your situation actually calls for.
How Are Custody and Child Support Decided?
Illinois family law uses updated terms for what many people still call “child custody” and “visitation.” Parental responsibilities cover decision-making authority—things like education, healthcare, and religion—while parenting time covers the schedule of when the child is with each parent. Both issues are considered separately.
How Are Parental Responsibilities and Parenting Time Decided?
Everything comes down to one standard: the best interests of the child. Parents are encouraged to work out a parenting plan together covering where the child lives, a parenting time schedule, and how decisions get made. If you have children under 18, the state requires both parents to complete a short parenting class before the divorce can be finalized.
If spouses can’t agree, a judge will decide, weighing each parent’s relationship with the child, the child’s adjustment to school and home, and each parent’s willingness to support the other parent’s relationship with the child.
Learn more about Illinois custody laws here.
How Is Child Support Calculated?
Illinois uses the “income shares” model for child support. It estimates what parents would have spent on the child if the family were still together, then divides that amount between them based on income.
The child support calculation starts by combining both parents’ net incomes and determining the total support obligation based on state guidelines. That total is then split between parents in proportion to each parent’s share of the combined income. Parenting time factors in, too. Once a parent has the child overnight for more than 146 nights a year (roughly 40% of the time), the formula shifts to a “shared care” calculation that accounts for the costs each household covers directly.
The guideline amount typically factors in:
- Both parents’ gross income from all sources: wages, self-employment, bonuses, and similar
- Health insurance premiums paid for the child
- Work-related childcare costs
- In some cases, additional expenses like extracurricular activities or uninsured medical costs
Courts can deviate from the guideline amount when the situation calls for it—for example, if a child has significant medical or educational needs, if a parent’s income fluctuates substantially (common with self-employment, commission-based work, or seasonal jobs), or if applying the standard formula would produce an inequitable result given the family’s specific circumstances.
Domestic Violence and Divorce
If you’re in danger, an Order of Protection is separate from the divorce process itself, and you don’t have to wait until you file for divorce to get one. Under the Illinois Domestic Violence Act, a court can issue an Emergency Order of Protection the same day it’s requested, often without the other party present, covering things like staying away from you, your home, and your children, and temporary custody or support arrangements. That emergency order typically lasts up to 21 days, bridging the gap until you have a full hearing.
Domestic violence doesn’t affect the “no-fault” nature of the divorce filing itself, but it’s directly relevant to decisions about parenting time and parental responsibilities; Illinois courts are required to consider a parent’s history of abuse when determining what’s in a child’s best interests. If safety is a concern, it’s worth raising with your attorney immediately, even before other divorce paperwork is filed.
If you or someone you know needs help, the Illinois Domestic Violence Hotline at (877) 863-6338 is confidential and available 24/7 via phone call or text message. At Mulyk Laho Law, we offer a free initial consultation and can help you obtain an Order of Protection. Call us at (630) 852-1100.
What’s the Biggest Mistake People Make During a Divorce?
The most common mistake in a divorce is letting emotion drive decisions that have long-term financial or parenting consequences. That tends to show up a few ways:
- Agreeing to unfavorable terms just to end the process faster.
- Hiding financial assets, which can backfire badly if discovered.
- Making major financial moves, like large withdrawals or new debt, before the case is finalized.
- Leaving a shared home without understanding how it affects custody or property claims.
- Making decisions about the kids without a court order—like relocating, limiting the other parent’s time, or pulling kids from school.
Slowing down and getting guidance before making these decisions is usually cheaper than fixing them afterward. Our experienced divorce lawyers offer a free consultation, and we’re here to give you practical advice about your options. Don’t hesitate to give us a call at (630) 852-1100.
How Our Illinois Divorce Lawyers Support You
Divorce is stressful enough without wondering whether your attorney will return your calls or what you’re actually being billed for. Here’s what you can expect when you work with us:
- Free consultation. Speak to an attorney for free, with no obligation. You’ll leave with a clear path forward.
- Responsive communication. You’ll hear back from our team promptly, and you’ll always know who to contact with a question.
- Transparent billing. You’ll understand our fee structure upfront, with clear invoices and no surprise charges.
- Local knowledge. Our team has 55 years of combined experience with the courts, procedures, and personnel across DuPage, Cook, Will, Kane, Kendall, and Lake counties, so we can help you anticipate what’s ahead rather than react to it.
- A plan tailored to you. Whether your divorce is amicable or contested, we build a strategy around your goals and match the temperature your case requires.
If you’re considering an Illinois divorce and want an experienced attorney who will fight for your best interests, contact Mulyk Laho Law today to schedule your free consultation.