Child Custody in Illinois: A Complete Guide for Parents

If you’re facing a divorce, separation, or paternity case in Illinois, understanding how the state handles custody—and what your rights actually are—is the first step toward feeling steady again.

This guide walks through how Illinois custody law works today, including filing, modifying, and living under a custody order.

5 Things to Know About Illinois Custody Laws

1. Illinois no longer legally uses the word “custody.” Since 2016, the law refers to “allocation of parental responsibilities” and “parenting time” instead of custody and visitation.
2. Illinois courts require both parents to complete a parenting education class whenever minor children are involved in a divorce or parentage case, regardless of whether the case is contested. 
3. Courts decide based on the “best interest of the child” standard. Illinois law lays out specific factors judges are required to weigh.
4. Parents must file a parenting plan within 120 days of the case being filed—either a plan both parents agree on, or competing plans if they don’t.
5. A custody order isn’t permanent. It can be modified later, but the legal standard for changing it depends on what you’re trying to change.

What Is “Allocation of Parental Responsibilities”? Understanding the Two Types of Custody

When you think about custody agreements, you’re probably thinking in terms of “sole custody” or “joint custody”—but in Illinois, it’s a little more complicated than that. The court is actually deciding two separate questions: who makes the big decisions for the child, and how the child’s time is divided between parents.

Full custody means you have full decision-making responsibility and the majority of parenting time. When it comes to shared custody (aka joint custody or co-parenting), a parent can have significant parenting time without having decision-making authority, and vice versa.

Decision-Making Responsibility

In Illinois, decision-making responsibility covers 4 specific categories:

• Education: School choice, tutoring, and special education services
• Health: Medical, dental, and mental health care decisions
• Religion: Religious upbringing and practice
• Extracurricular Activities: Sports, clubs, and other activities

Courts can award decision-making jointly, requiring both parents to agree, or award it solely to one parent.

Joint decision-making doesn’t mean every decision requires complete agreement in the moment. Many parenting plans build in a primary decision-maker for specific categories, or a tie-breaking process, so co-parenting arrangements don’t stall out over disagreements.

Parenting Time

Parenting time covers the schedule of when the child is with each parent. There’s no single “standard” schedule under Illinois law, and no presumption that time has to be split evenly. What a court approves depends heavily on the child’s age, each parent’s schedule and location, and how the parents have historically shared caregiving.

Common parenting time arrangements include:

• 50/50 Parenting Time: The child splits time evenly between both parents, often on an alternating-week schedule or a rotating pattern like 2-2-3. Illinois courts will approve 50/50 parenting time when it serves the child’s best interest, but it isn’t automatically favored over other arrangements. It depends on factors like how close the parents live to each other and to the child’s school, and how well the parents can coordinate.
• Majority Parenting Time: One parent has the child more often (for example, during the school week), while the other parent has scheduled evenings, weekends, or an alternating weekend schedule.
• Sole Parenting Time: It’s uncommon for one parent to get 100% of parenting time, but it’s possible when the court finds that time with the other parent isn’t in the child’s best interest, such as in cases involving abuse, neglect, or abandonment. Even then, the other parent may be granted limited or supervised parenting time unless the court finds that any contact would be harmful.
• Age-Adjusted Schedule: This is common for very young children, where overnight time increases gradually as the child gets older.
• Holiday and School Break Schedules: These are typically addressed separately from the regular weekly schedule, since holidays don’t fit a repeating weekly pattern.

Whatever the arrangement, a parenting time schedule should be specific enough that both parents know exactly when exchanges happen, down to pickup times and locations—vague schedules can lead to future disputes.

How Illinois Courts Decide: The Best Interest Factors

The “best interest of the child” standard is the guiding principle behind every custody decision an Illinois court makes. For both decision-making and parenting time, judges are required to evaluate what arrangement best serves the child’s wellbeing.

Illinois law lists specific “best interest” factors judges must consider, which fall into a few broad categories:

• The child’s own wishes, weighed based on the child’s age and maturity
• Each parent’s wishes regarding decision-making and parenting time
• The child’s relationships with each parent, siblings, and anyone else who significantly affects the child’s best interest
• How the child has adjusted to their home, school, and community
• Physical and mental health of everyone involved
• Any history of violence or abuse, including whether either parent has a history of failing to place the child’s needs first
• Each parent’s willingness to cooperate and facilitate a close relationship between the child and the other parent
• Practical considerations, like each parent’s ability to cooperate on caregiving, the distance between parents’ homes, and each parent’s actual availability

In addition to representing parents in family court, our partners serve as Guardians ad Litem (GAL). A GAL can be appointed by the court to investigate and report on the best interests of a child. This certification gives our team a deep understanding of how local courts interpret the standard. 

How to File for Custody in Illinois

Custody agreements in Illinois begin with a Petition for Allocation of Parental Responsibilities. It’s filed either as part of a divorce case or, for unmarried parents, as part of a parentage case.

At a high level, the process looks like this:

1. File the petition in the circuit court of the county where the child lives.
2. Serve the other parent, unless they agree to waive formal service.
3. Attend a parenting class, generally within 60 days of the initial case management conference.
4. File a parenting plan (or competing plans) within 120 days of filing the petition.
5. Illinois requires mediation if the parents haven’t agreed on a plan. If the parents still can’t agree, the case proceeds to trial.
6. Receive a final allocation judgment, either through agreement or after a hearing.

Emergency and Temporary Custody Orders

Custody cases can take months to resolve, and Illinois courts recognize that some situations can’t wait that long.

Temporary custody orders put a decision-making and parenting time arrangement in place while the full case is pending. Either parent can ask for one, and the court evaluates it under the same best-interest framework used for the final order.

Emergency custody orders are reserved for situations involving an immediate risk to the child—a credible safety threat, not simply a disagreement between parents. Emergency custody orders can be granted without notifying the other parent first, and because of this, the courts hold them to a higher standard and typically require a follow-up hearing soon after.

Custody Rights for Specific Family Situations

Not every family fits the model of two married parents splitting time and decisions. Unmarried parents, non-custodial parents, and grandparents all have different questions to answer before custody or visitation is even on the table.

Rights of Unmarried and Non-Custodial Parents

For unmarried parents, custody rights don’t exist automatically—parentage has to be legally established first, either through an acknowledgment both parents sign or a court proceeding. Once parentage is established, an unmarried father has the same right to seek decision-making responsibility and parenting time as he would if the parents had been married.

Being a “non-custodial” parent (meaning you don’t have primary parenting time or sole decision-making) doesn’t mean your rights disappear. You’re still entitled to parenting time unless a court has specifically restricted it, and you retain whatever decision-making authority your order grants, even if it’s shared or limited to certain categories.

Grandparents’ Rights in Illinois

Grandparents don’t have an automatic right to visitation or custody, which catches many people off guard. Illinois law only allows a grandparent to petition for visitation in specific circumstances, such as when a parent is deemed unfit, incarcerated, or deceased, or when the parents are divorced or living separately and at least one parent doesn’t object to the grandparent’s request.

Getting custody or guardianship of your grandchildren is a more involved process than visitation, and typically requires its own petition.

Can You Update a Custody Agreement?

Yes, you can modify the allocation of parental responsibilities even after a judge signs the order. Life doesn’t stay still, and Illinois law accounts for that—within limits.

Modifying a Custody Order

To change an existing custody or child support order, you must file a Motion to Modify Allocation of Parental Responsibilities. Illinois treats modifications to decision-making responsibility differently than modifications to parenting time.

Decision-making responsibility generally can’t be modified within 2 years of the original order, unless the child’s current environment seriously endangers their physical, mental, or emotional health. After 2 years, a parent still has to show a substantial change in circumstances since the last order.

Parenting time modifications are held to a more flexible standard and aren’t subject to the same waiting period, though a parent still needs to show the change serves the child’s best interest.

Relocating With Your Child

If a parent with a majority of parenting time wants to move, Illinois law requires advance written notice to the other parent, and (depending on the distance and county involved) court approval before the move happens. 

The specific notice requirements and distance thresholds involved can get technical, so it’s worth discussing with an attorney before you give notice or respond to one. 

Risks of Making Changes Outside the Proper Process

Custody disputes bring out strong emotions, so it’s understandable that parents sometimes want to skip the red tape and handle things directly: keep the kids an extra weekend, skip a scheduled visit, or make a decision on schooling without looping the other parent in. But making those types of changes outside the court process carries real risk, even when it feels justified. 

Illinois courts can respond to unauthorized changes with fines, orders requiring immediate compliance, and orders to pay the other parent’s attorney fees. Additionally, a pattern of acting outside the court-approved arrangement can work against you if custody or parenting time come up for modification later. 

If something isn’t working, the better path is almost always to go back to court rather than risking your future parenting rights.

Frequently Asked Questions

What’s the difference between custody and parenting time in Illinois? “Custody” is the old term for what Illinois law now splits into two parts: decision-making responsibility (who decides major issues like education and healthcare) and parenting time (the schedule of when the child is with each parent). A parent can have one without the other. Together, these are known as the “allocation of parental responsibilities.”

Can a grandparent get custody of a grandchild in Illinois? It’s possible, but only in limited circumstances—typically when neither parent is able or willing to care for the child.

Do unmarried fathers have custody rights in Illinois? An unmarried father doesn’t have automatic decision-making or parenting time rights, so establishing parentage is often the first legal step. Once parentage is legally established, unmarried fathers can get custody rights (decision-making authority and/or parenting time) with a court order. It’s rare for the courts to completely deny a father any visitation rights, but visits may be supervised depending on the circumstances.

How do I file for emergency custody in Illinois? Emergency custody requests are filed as part of an existing or new custody case and require showing an immediate risk to the child’s safety. Because these requests can be granted without notifying the other parent first, courts apply a higher standard than they do for standard temporary orders.

Where can I take the mandatory parenting class? Illinois law requires both parents to take a parenting education class for any custody case involving a minor. Each county has its own approved program(s).

Can pets be part of a custody agreement in Illinois? Illinois law does allow courts to allocate ownership and care of companion animals as part of a divorce, considering factors like the animal’s well-being. Pet custody is separate from child custody and handled under different provisions.

At Mulyk Laho Law, our child custody lawyers take the time to listen, understand your specific situation, and give you a clear path forward. We work with child psychologists, social workers, and other child welfare specialists to build your strongest possible case. 

Whether you need to formalize a friendly agreement or fight a tough custody battle, we’ll guide you through with personalized attention and 55 years of combined courtroom experience.

Call our Glen Ellyn office at (630) 852-1100 or contact us online to schedule your free consultation.

Sources:

• Illinois Marriage and Dissolution of Marriage Act (750 ILCS 5)
• Illinois Parentage Act of 2015 (750 ILCS 46)
• Illinois Supreme Court Rule 924