Sole custody means one parent makes the major decisions for a child, and often has the child living with them most of the time. Joint custody means both parents share those decisions, and the children spend meaningful time in both homes. In practice, though, custody is really two separate questions: who decides, and where the child spends time. Courts in Illinois and Indiana answer both by asking what is in the child's best interests, and the answers can be mixed in ways the words “sole” and “joint” don't fully capture.
Sole vs. joint custody: decision-making and parenting time
Most families find it easier to think about custody in two parts.
- Decision-making (often called legal custody). This is the authority to make major choices about a child's education, health care, religion and similar matters. When decision-making is shared, parents are expected to consult each other. When one parent has it, that parent makes the call.
- Parenting time (often called physical custody). This is the schedule: where the child lives day to day and when each parent has the child.
The two can be allocated differently. For example, parents might share decision-making while one home serves as the child's primary residence. Parents who search for “full custody” usually mean sole decision-making, a primary residence with them, or both. It helps to be specific about which one you want, because a judge will look at each separately.
How Illinois and Indiana courts decide
The two states use different vocabulary, but the guiding standard is the same: the child's best interests.
Illinois. Illinois law no longer uses the word “custody” in family cases. It speaks of the “allocation of parental responsibilities,” divided into decision-making and parenting time. The court allocates decision-making according to the child's best interests and considers a list of statutory factors (750 ILCS 5/602.5). It also allocates parenting time according to the child's best interests, unless the parents submit an agreed written parenting plan that the court approves (750 ILCS 5/602.7). Each parent is required to file a proposed parenting plan, jointly or separately, within 120 days after a petition is served or filed, though the court can extend that deadline for good cause (750 ILCS 5/602.10).
Indiana. Indiana still uses the terms legal custody and physical custody. Courts decide custody in the child's best interests, with no presumption favoring either parent, after weighing all relevant factors (Indiana Code 31-17-2-8). The court may award legal custody jointly if it finds that joint legal custody would be in the child's best interest (Indiana Code 31-17-2-13). Parenting time is guided by the Indiana Parenting Time Guidelines, a set of court rules adopted by the Indiana Supreme Court (Indiana Parenting Time Rule).
Because we serve families on both sides of the state line from our Chicago and Hammond offices, we often explain these differences to parents who live in one state and work or have family in the other. Which state's court hears your case depends on your facts, so it is worth getting that answer early.
What 50/50 or equal custody really looks like
“Equal custody” usually describes a parenting schedule where the child spends roughly equal time with each parent. Common examples include alternating weeks, or a two-two-three rotation. It is a schedule, not a legal category, and it can be paired with shared or divided decision-making.
Equal time tends to work best when parents live reasonably close to each other, can communicate about logistics, and have work schedules that allow for it. It is not an automatic starting point in either state, since the court's focus is what serves the child, not a fixed split. If your work involves rotating shifts or overtime, your schedule may need to be built around your rotation. Our post on shift work and custody parenting plans walks through ideas that apply to many families.
When a court awards sole custody
Courts do not require every parent to share decision-making. In Illinois, the statute does not require that every parent be allocated decision-making responsibility, and the court can allocate it to one parent or to both after looking at the child's best interests. Indiana courts likewise may award legal custody to one parent when joint legal custody would not be in the child's best interest.
Factors a court may weigh include:
- How well the parents communicate and cooperate on important decisions.
- Each parent's history of involvement in the child's daily care, school and health needs.
- The child's adjustment to home, school and community.
- The child's wishes, depending on age and maturity.
- Any safety concerns involving the child.
Every case is different, and these are general categories rather than a checklist that predicts an outcome. Keeping records of your involvement, such as school and medical appointments, can help you explain your role clearly.
Changing a custody arrangement later
Orders are not necessarily permanent. In Illinois, changing a parenting plan or allocation judgment generally requires facts that arose after the judgment, or that were not anticipated in it, showing a substantial change in circumstances and that the change is necessary to serve the child's best interests (750 ILCS 5/610.5). Indiana's custody modification rules are found in the same chapter of the Indiana Code that governs custody orders (Indiana Code, Title 31, Article 17, Chapter 2), and they also look to a substantial change in circumstances and the child's best interests. That page is a 2014 version, so the current wording should be confirmed for your situation.
Examples of changes people ask about include a parent relocating, a significant change in work schedule, or a child's needs changing as they grow. If child support is affected by a new schedule, see how child support is calculated in Indiana and Illinois. And if you are unsure how custody differs from guardianship, read the distinction between child custody and guardianship.
Common questions about sole and joint custody
Is joint custody the same as 50/50?
Not necessarily. Joint custody often refers to shared decision-making. Parenting time can be equal or unequal, depending on what the court approves or what the parents agree to.
Does the mother automatically get custody?
No. Indiana law says there is no presumption favoring either parent, and Illinois focuses on the child's best interests.
Can parents agree on their own plan?
Often, yes. In Illinois, the court allocates parenting time on its own findings unless the parents present an agreed written parenting plan that the court approves. A clear, detailed agreement can reduce stress and cost.
How long do I have to file a parenting plan in Illinois?
Each parent must file a proposed parenting plan within 120 days after the petition is served or filed, unless the court extends the deadline for good cause.
Talk to a custody attorney
Choosing between sole and joint arrangements is rarely simple, and you don't have to sort it out alone. Our team brings clarity, preparation and responsive representation to each family, from consultation through resolution, with realistic expectations at every step. Learn more about our child custody services, or read about our approach to divorce if custody is part of a larger change for your family. Request a consultation to speak with an attorney in Chicago or Hammond. Se habla español.
Sources and further reading
- 750 ILCS 5/602.5: Allocation of parental responsibilities: decision-making, Illinois General Assembly
- 750 ILCS 5/602.7: Allocation of parental responsibilities: parenting time, Illinois General Assembly
- 750 ILCS 5/602.10: Parenting plan, Illinois General Assembly
- 750 ILCS 5/610.5: Modification, Illinois General Assembly
- Indiana Code 31-17-2-8: Custody order factors, FindLaw (Thomson Reuters)
- Indiana Code 31-17-2-13: Joint legal custody, FindLaw (Thomson Reuters)
- Parenting Time Rule and Guidelines, Indiana Judicial Branch
- Indiana Code Title 31, Article 17, Chapter 2: Actions for Child Custody and Modification of Child Custody Orders, Justia
This article is for general information and is not legal advice.