Illinois child custody laws operate under the Illinois Marriage and Dissolution of Marriage Act (IMDMA), 750 ILCS 5, which replaced traditional "custody" terminology with "allocation of parental responsibilities" in 2016. Under this framework, Illinois courts allocate both decision-making responsibilities and parenting time based on 17 statutory best interest factors. The filing fee for custody petitions ranges from $250 to $388 depending on county, with Cook County charging the highest rate at $388. Parents must file a proposed parenting plan within 120 days of petition service, and Illinois requires at least 90 days of state residency before courts can enter final custody orders.
Key Facts: Illinois Child Custody at a Glance
| Requirement | Details |
|---|---|
| Filing Fee | $250-$388 (Cook County: $388) |
| Residency Requirement | 90 days in Illinois |
| Parenting Plan Deadline | 120 days after petition service |
| Modification Waiting Period | 2 years (except emergencies) |
| Relocation Notice | 60 days advance written notice |
| Relocation Distance (Cook/Collar Counties) | 25 miles triggers notice |
| Relocation Distance (Other Counties) | 50 miles triggers notice |
| Best Interest Factors | 17 statutory factors under 750 ILCS 5/602.7 |
| Mediation | Court-ordered unless impediments exist |
| Guardian ad Litem Retainer | Typically $2,500 (split between parents) |
Allocation of Parental Responsibilities: What Replaced "Custody" in Illinois
Illinois abolished the terms "custody" and "visitation" in 2016, replacing them with "allocation of parental responsibilities" under 750 ILCS 5/602.5 and 750 ILCS 5/602.7. This terminology change reflects the modern understanding that both parents maintain ongoing responsibilities for their children. Under the current framework, Illinois courts allocate two distinct categories: decision-making responsibilities (major life decisions) and parenting time (physical time with the child).
Decision-making responsibilities under Illinois law cover four major categories: education, health, religion, and extracurricular activities. Parents may share these responsibilities jointly, or courts may allocate specific categories to different parents based on demonstrated competence and involvement. For example, one parent might receive sole decision-making for educational matters while the other receives authority over religious upbringing. Courts make these allocations under 750 ILCS 5/602.5 using the child's best interest standard.
Parenting time allocation determines the schedule of when each parent has physical time with the child. Illinois law presumes both parents are fit, and courts cannot restrict parenting time without finding by a preponderance of evidence that unrestricted time would seriously endanger the child's physical, mental, moral, or emotional health. This presumption of fitness under 750 ILCS 5/602.7(a) represents a significant protection for parental rights in Illinois custody proceedings.
The 17 Best Interest Factors Illinois Courts Must Consider
Illinois courts evaluate custody arrangements using 17 specific factors enumerated in 750 ILCS 5/602.7(b). These factors provide the framework for all parenting time decisions, and judges must consider each one when making allocation determinations. While courts need not explain their analysis of every factor in written orders, the statutory requirement ensures comprehensive evaluation of each family's circumstances.
The 17 factors under Illinois law include:
- The wishes of each parent seeking parenting time
- The wishes of the child, considering maturity and ability to express reasoned preferences
- The amount of time each parent spent performing caretaking functions within the 24 months before filing
- Any prior agreement between parents regarding caretaking responsibilities
- The interaction and relationship of the child with parents, siblings, and other significant persons
- The child's adjustment to home, school, and community
- The mental and physical health of all individuals involved
- The child's needs
- Distance between parents' residences, transportation costs, and daily schedules
- The willingness of each parent to facilitate a relationship with the other parent
- Physical violence or threat of violence by a parent against the child
- Physical violence or threat of violence by a parent directed against another person
- Occurrence of ongoing abuse against the child or household member
- Whether a parent is a convicted sex offender (nature of offense and treatment participation)
- Terms of a parent's military family-care plan that affects parenting functions
- Whether a parent was convicted of certain offenses involving the child
- Any other factor the court expressly finds relevant to the child's best interests
Illinois judges assign different weight to these factors based on the specific circumstances of each case. Courts give substantial consideration to factor 10 (willingness to facilitate the other parent's relationship) because it indicates a parent's ability to co-parent effectively. Factor 3 (historical caretaking time) often influences initial allocations by recognizing established parent-child routines.
Illinois Parenting Plan Requirements Under 750 ILCS 5/602.10
Illinois requires all parents in custody proceedings to file a proposed parenting plan within 120 days after service of any petition for allocation of parental responsibilities. This deadline under 750 ILCS 5/602.10 may be extended by the court for good cause. Parents may file jointly if they agree on all terms, or separately if disputes remain. When parents cannot agree, the court conducts an evidentiary hearing to allocate responsibilities.
A valid Illinois parenting plan must address these required elements:
- Allocation of significant decision-making responsibilities (education, health, religion, extracurricular activities)
- Living arrangement provisions and parenting time schedule
- Designation of which parent's home the child resides in on specific days
- Mediation provisions for future disputes (unless one parent has sole decision-making)
- Access to medical, dental, psychological, childcare, school, and extracurricular records
- Designation of the parent with majority parenting time
- Child's residential address for school enrollment purposes
- Current residence addresses and phone numbers for both parents
- Employment addresses and phone numbers for both parents
- Notification requirements for residence changes
- Transportation arrangements between households
- Provisions for future modifications
- Child support obligations
- Allocation of uncovered medical expenses
Courts must approve agreed parenting plans unless they find the terms unconscionable. If parents submit separate proposed plans, the judge reviews both, approves areas of agreement, and rules on disputed provisions. The resulting court order becomes an "Allocation Judgment" binding on both parties.
Filing for Child Custody in Illinois: Costs and Procedures
The filing fee for a custody petition in Illinois ranges from $250 to $388 depending on which circuit court handles your case. Cook County charges the highest rate at $388 for filing a petition in the Domestic Relations Division. Additional fees include $251 for the responding parent to file an appearance, $40 per motion, and $25 for certified copies. Sheriff service costs $60 in Cook County. These fees are current as of March 2026; verify with your local circuit clerk before filing.
Illinois provides fee waivers for families who cannot afford court costs. Under Illinois Supreme Court Rule 298, you may qualify if your household income falls at or below 125% of the federal poverty guidelines. For a single person in 2026, this threshold means annual income below approximately $18,500. Fee waiver applications require documentation of income and assets.
Residency Requirements for Illinois Custody Jurisdiction
Illinois requires at least one spouse or parent to be a resident for 90 days immediately preceding the filing of a dissolution or custody petition under 750 ILCS 5/401(a). This residency requirement applies to divorce filings that include custody provisions. Military personnel stationed in Illinois for 90 days qualify as residents under this provision, even if their permanent domicile is elsewhere.
You can file for custody in Illinois before completing the 90-day residency period, but the court cannot enter a final judgment until the requirement is satisfied. Filing in the wrong county or before establishing residency may result in case dismissal for lack of subject matter jurisdiction. Proper venue lies in the county where either parent resides, as specified in 750 ILCS 5/104.
Modifying Parenting Time and Decision-Making in Illinois
Illinois imposes a two-year waiting period before parents can seek modification of parenting allocation orders under 750 ILCS 5/610.5. This stability requirement protects children from constant litigation and gives parenting arrangements time to establish patterns. Courts may waive the two-year period only when the child's present environment seriously endangers their physical, mental, moral, or emotional health.
After the two-year period, modification requires proving a substantial change in circumstances affecting the child's best interests. The requesting parent carries the burden of proof by a preponderance of evidence. Common grounds for modification include:
- Relocation by either parent
- Significant changes in work schedules affecting availability
- Changes in the child's developmental needs
- Evidence of parental unfitness emerging after the original order
- Documented failure to follow the existing parenting plan
- Changes in the child's preference (if the child has reached sufficient maturity)
Parenting time modifications follow somewhat different rules than decision-making modifications. Courts may modify parenting time at any time when changed circumstances affect the child's best interests, though they still require evidence of substantial change.
Illinois Relocation Rules: The 25-Mile and 50-Mile Requirements
Illinois defines "relocation" differently depending on where the child currently lives. Under 750 ILCS 5/609.2, relocation occurs when a parent with majority or equal parenting time moves:
- More than 25 miles from the child's current residence in Cook, DuPage, Kane, Lake, McHenry, or Will Counties
- More than 50 miles from the child's current residence in any other Illinois county
- Outside Illinois to any location more than 25 miles from the child's current residence
The distance limit is determined by the county you are moving FROM, not the county you are moving TO. A parent living in Kane County triggers the 25-mile rule even when moving to a rural county that normally follows the 50-mile standard. Distance calculations use Internet mapping services as the official measurement method.
Relocation notice requirements mandate 60 days advance written notice to the other parent, with a copy filed with the circuit court clerk. The notice must include: (1) the intended relocation date, (2) the new residence address if known, and (3) the expected duration if the move is temporary. If the non-relocating parent consents by signing the notice, relocation proceeds without court action. If the non-relocating parent objects or fails to respond, the relocating parent must file a petition seeking court permission.
| Scenario | Notice Requirement | Court Action Needed |
|---|---|---|
| Move within 25 miles (Cook/Collar) | None required | No |
| Move 26+ miles (Cook/Collar) | 60 days written notice | Yes, if objection |
| Move within 50 miles (other counties) | None required | No |
| Move 51+ miles (other counties) | 60 days written notice | Yes, if objection |
| Move outside Illinois 25+ miles | 60 days written notice | Yes, if objection |
| Non-majority parent relocating | None required | No |
Guardian ad Litem and Child Representative Appointments
Illinois courts may appoint legal representation for children in custody disputes under 750 ILCS 5/506. Three types of appointments exist: Guardian ad Litem (GAL), Child Representative (CR), and Attorney for the Child. Each serves different functions in custody proceedings.
A Guardian ad Litem investigates the facts, interviews the child and parents, and submits a written report with recommendations to the court. The GAL testifies as a witness and may be cross-examined regarding their findings. Typical GAL retainers start at $2,500, split between the parents subject to reallocation based on financial resources.
A Child Representative advocates for what they determine to be the child's best interests after independent investigation. Unlike a GAL, the CR maintains attorney-client confidentiality with the child and participates in litigation like any party's attorney. The CR considers but is not bound by the child's expressed wishes.
Fee allocation for GAL and CR appointments falls under court discretion. Judges divide costs based on each parent's financial resources and ability to pay. If neither parent can afford representation, the court may order payment from the marital estate, establish payment plans, or in Cook County, appoint the Office of the Public Guardian.
Mediation Requirements in Illinois Custody Cases
Illinois courts order mediation to assist parents in formulating or modifying parenting plans unless impediments to mediation exist. Common impediments include domestic violence history, substance abuse issues, or significant power imbalances between parents. Costs for court-ordered mediation are allocated between the parties according to applicable statutes and Supreme Court Rules.
Mediation addresses disputed issues including parenting time schedules, decision-making allocation, holiday arrangements, and communication protocols. Successful mediation results in a binding agreement that the court incorporates into the allocation judgment. Failed mediation returns the case to litigation, with the mediator's communications remaining confidential and inadmissible.
Enforcement of Parenting Time Orders in Illinois
Violations of court-ordered parenting time may result in contempt proceedings, make-up parenting time, attorney fee awards, and modification of the allocation judgment. Illinois courts take enforcement seriously, recognizing that consistent parenting time serves children's best interests. Parents seeking enforcement should document violations with dates, times, and circumstances before filing motions.
Remedies for parenting time violations include:
- Compensatory parenting time to replace missed periods
- Modification of the parenting schedule
- Requirement that the violating parent post bond
- Attendance at parenting classes
- Civil contempt findings with potential jail time
- Award of attorney fees and court costs to the aggrieved parent