Illinois Child Custody Laws (2026): Allocation of Parental Responsibilities and Your Rights

Illinois courts decide child custody by the best interests of the child, using the state's own framework of "allocation of parental responsibilities" and "parenting time" since the 2016 Illinois Marriage and Dissolution of Marriage Act reform. There is no statutory presumption favoring joint allocation or any particular parenting-time split.

How does Illinois decide child custody?

Illinois courts allocate parental responsibilities under the best interests of the child standard set out in the Illinois Marriage and Dissolution of Marriage Act (IMDMA), codified at 750 ILCS 5/602.5 and 5/602.7. The Circuit Court in the county where the child resides has jurisdiction. Judges evaluate the totality of the family's circumstances, with separate statutory factor lists for significant decision-making authority and for parenting time. The standard is entirely child-centered: there is no automatic presumption for either parent, for joint allocation, or for any particular time-sharing percentage.

Illinois overhauled its custody language on January 1, 2016. Courts no longer issue "custody" or "visitation" orders. Instead, every final parenting order addresses two distinct issues: who has the authority to make significant decisions about the child's life (the allocation of parental responsibilities), and how parenting time is divided between the parents.

Types of custody in Illinois

Decision-making authority under Illinois law is called the allocation of parental responsibilities. The court can allocate all significant decision-making to one parent (sole allocation) or divide it between both parents (joint allocation). Significant decisions typically involve education, health care, extracurricular activities, and religious upbringing.

Parenting time replaces physical custody and visitation. The schedule can be roughly equal, primary with one parent and reasonable time with the other, or any other arrangement that serves the child's best interests. Either parent can be awarded more or less parenting time regardless of how decision-making is allocated; the two components are determined separately.

When parents reach a written parenting plan agreement, the court generally approves it unless it is not in the child's best interests. If parents cannot agree, the court decides each component independently.

Does Illinois presume joint or 50/50 custody?

No. Illinois has no statutory presumption of joint allocation of parental responsibilities, and no presumption of equal parenting time. Under 750 ILCS 5/602.5 and 5/602.7, every decision is made on a case-by-case basis under the best interests standard.

This distinguishes Illinois from states like Kentucky, Arkansas, and Florida, which enacted rebuttable presumptions of equal or joint custody in recent years. Illinois courts may absolutely award joint decision-making and equal parenting time, but neither outcome is presumed at the start of a case. A parent advocating for a particular allocation must demonstrate that it serves the child's best interests based on the enumerated factors.

The law is also clear that neither gender is favored. The former tender-years doctrine (which presumed mothers were better primary caregivers for young children) was abolished. Illinois courts must consider parents equally regardless of sex.

Parents in Illinois weighing a specific schedule can run it through the parenting-time calculator to see the resulting percentage and how it relates to child support.

The best interests factors Illinois courts weigh

For significant decision-making (750 ILCS 5/602.5), courts consider the parents' wishes; the child's wishes (given appropriate weight for age and maturity); the child's adjustment to home, school, and community; the mental and physical health of all parties; the child's needs; the distance between the parents' homes and the practicality of a shared schedule; the willingness of each parent to facilitate a close and continuing relationship between the child and the other parent; any prior agreement or course of conduct between the parties; and any history of abuse or domestic violence.

For parenting time (750 ILCS 5/602.7), courts apply a related but distinct list that also weighs the caretaking functions each parent performed in the 24 months before the proceedings (or since the child's birth if younger), the child's activities and community ties, whether restriction of parenting time is appropriate, and the physical/mental health of the parties. The two-year caretaking-history factor gives real weight to the parent who has been the primary day-to-day caregiver.

Judges may also consider any other relevant factor the court expressly finds to be in the child's best interests.

Relocation: moving with your child in Illinois

Illinois has a specific relocation statute at 750 ILCS 5/609.2, which applies only to a move that meets the definition of "relocation" in 750 ILCS 5/600(g): more than 25 miles from the child's current residence for a family in Cook, DuPage, Kane, Lake, McHenry, or Will County, more than 50 miles for a family in any other Illinois county, or more than 25 miles to a residence outside Illinois. A shorter move does not trigger the relocation procedure below. A parent who has a majority or equal share of parenting time and wishes to relocate as defined above must give the other parent at least 60 days advance written notice, unless that is impracticable. The notice must include the intended new address, the proposed move date, and, if known, the duration of the relocation.

If the non-relocating parent signs the notice and it is filed with the court, the relocation is allowed without any further court action. If the non-relocating parent objects to the relocation, fails to sign the notice, or the parents cannot agree on a modified parenting plan, the relocating parent must file a petition asking the court for permission to relocate. The judge then applies the best-interests factors in 750 ILCS 5/609.2(g), including the reasons for the move, the child's relationship with each parent, educational opportunities at the new location, the presence of extended family, the child's wishes, and minimizing impairment to the parent-child relationship, among other factors. There is no fixed number of days for the non-relocating parent to object.

Relocation is treated as a substantial change in circumstances under 750 ILCS 5/610.5, which means it can open the door to modifying the existing allocation order.

Changing a custody order (modification)

Illinois law at 750 ILCS 5/610.5 sets a stability barrier, but it applies only to significant decision-making, not to parenting time. Unless the parties stipulate otherwise, or the case falls under Section 603.10 of the Act, no motion to modify an order allocating significant decision-making responsibilities may be filed earlier than two years after that order, unless the court permits it based on affidavits showing reason to believe the child's present environment may seriously endanger the child's mental, moral, or physical health or significantly impair the child's emotional development. This two-year bar is intended to reduce litigation and protect children from repeated disruptions.

Parenting time is expressly excluded from that two-year bar. Under the same section, parenting time may be modified at any time, without any showing of serious endangerment, upon a showing of changed circumstances that necessitates modification to serve the child's best interests. A parent who needs to change the schedule does not have to wait two years to ask.

After two years, a modification of significant decision-making responsibilities requires proof of a substantial change in circumstances affecting the child's welfare, plus a showing that the proposed modification serves the child's best interests under the same statutory factors. Examples of qualifying changes include a significant shift in either parent's work schedule, a relocation, a change in the child's needs, documented evidence of abuse, or a meaningful change in the child's relationship with a parent.

If you also have a child support order in Illinois, changes in parenting time often affect the support calculation; see our Illinois child support laws page for details. Estimate the amount with our Illinois child support calculator.

If you are facing a custody case in Illinois

A few practical steps make a meaningful difference in Illinois allocation proceedings:

Prepare a detailed parenting plan. Illinois courts expect parents to submit a parenting plan within 120 days of filing. Your plan should address parenting-time schedules, holiday rotations, decision-making procedures, and how disputes will be resolved. A thoughtful, child-focused plan signals cooperation to the court.

Document your caretaking role. Because Illinois courts look closely at the prior 24 months of caretaking functions, keep records of school pickups, medical appointments, homework, sports practices, and other daily involvement. Text messages, calendars, and school or healthcare records all support your case.

Focus on the child's needs, not the conflict. Courts respond poorly to parents who appear more focused on winning against the other parent than on what is best for their child. Demonstrating that you support the child's relationship with the other parent is one of the explicit statutory factors.

Consider mediation. Many Illinois circuits require or strongly encourage mediation before a contested allocation hearing. Mediation often produces more flexible, workable parenting plans than court orders.

If the allocation is contested, or domestic violence or relocation is involved, get a free case evaluation from an Illinois family lawyer and prepare your case for court (attorney advertising).

This article is general legal information, not legal advice. Child custody law varies by state and turns on the specific facts of each family. For advice about your situation, consult a licensed family-law attorney in Illinois.

Related pages:

• Child Custody Laws by State (hub)
• Illinois Child Support Laws
• Illinois Alimony Laws
• Illinois Emancipation Laws

More Illinois Laws

• Illinois Alimony Laws
• Illinois Child Support Laws
• Illinois Divorce Laws
• Illinois Emancipation Laws
• Illinois Restraining Order Laws

Frequently Asked Questions

How is child custody determined in Illinois?

Illinois courts determine the allocation of parental responsibilities and parenting time based on the best interests of the child. Judges apply the enumerated factors in 750 ILCS 5/602.5 (decision-making) and 5/602.7 (parenting time), considering each parent's caretaking history, the child's needs and preferences, each parent's willingness to support the child's relationship with the other parent, and history of abuse, among other factors.

Does Illinois favor the mother in custody cases?

No. Illinois law is gender-neutral. The old tender-years doctrine that presumed mothers were better primary caregivers has been abolished. Courts must treat both parents equally and base every decision solely on the best interests of the child, without regard to either parent's sex.

Is Illinois a 50/50 custody state?

No. Illinois has no statutory presumption of equal parenting time or joint allocation of parental responsibilities. Courts decide the schedule case-by-case under the best interests standard. Equal parenting time is absolutely possible, but it is not presumed; either parent must show that a particular arrangement serves the child's best interests.

At what age can a child choose which parent to live with in Illinois?

Illinois law does not set a specific age at which a child can choose. Under 750 ILCS 5/602.7, the child's preferences are one factor the court considers, with greater weight given as the child demonstrates maturity and insight. A teenager's reasoned preference can be influential, but it is not binding; the court always retains discretion to act in the child's best interests.

How do I change a custody order in Illinois?

It depends on which part of the order you want to change. Under 750 ILCS 5/610.5, parenting time may be modified at any time: there is no waiting period and no need to show serious endangerment, only changed circumstances that make the modification necessary to serve the child's best interests. Significant decision-making responsibilities are different. Unless the parties stipulate otherwise or Section 603.10 applies, a motion to modify decision-making generally cannot be filed until two years after the order, unless the court permits it on affidavits showing the child's present environment may seriously endanger the child's mental, moral, or physical health or significantly impair emotional development. After two years, you must show a substantial change in circumstances affecting the child's welfare and demonstrate that the modification serves the child's best interests.

Can a parent move away with the child in Illinois?

A parent with a majority or equal share of parenting time who wishes to relocate more than 25 miles (in Cook, DuPage, Kane, Lake, McHenry, or Will County), more than 50 miles (elsewhere in Illinois), or more than 25 miles out of state must give the other parent at least 60 days written advance notice under 750 ILCS 5/609.2. If the other parent signs the notice, the relocation proceeds without further court action. If the other parent objects, fails to sign, or the parents cannot agree on a modified parenting plan, the relocating parent must petition the court, which weighs the reasons for the move, its impact on the child's relationship with both parents, and the child's best interests under the factors in 750 ILCS 5/609.2(g).

What is the difference between legal and physical custody in Illinois?

Illinois replaced those terms in 2016. 'Legal custody' is now called the allocation of significant decision-making responsibilities (covering education, health, religion, and activities), and 'physical custody' is now called parenting time (the schedule of when the child is with each parent). The court allocates them separately, so one parent can have more parenting time while both share equal decision-making authority, or any other combination.