Disclaimer: This article is for general informational purposes only and does not constitute legal advice. Custody terminology and standards differ between Illinois and Iowa, and every case depends on the facts, the court order, and the child's best interests.
How Is Child Custody Determined?
Few questions weigh more heavily on a parent's mind during a divorce or separation than this one: Who will my child live with, and who gets to make decisions about their life? Child custody is often the most emotionally charged part of any family law case, and the rules around it can feel confusing, especially when you're trying to make sense of what a judge will actually consider. At Greenwood Law, we help parents in Illinois and Iowa understand how custody decisions are made, what the law requires, and how to protect both their children and their parental rights from the very first filing.
The short answer is that custody is determined by a single guiding principle: the best interests of the child. Everything else including statutes, parenting plans, court testimony, and evaluations exist to help a judge apply that standard to your family's unique situation.
Two Sides of Custody: Decision-Making and Parenting Time
Parents often use the word "custody" as a shorthand, but the legal terminology differs by state. Illinois has moved away from traditional custody and visitation labels and instead uses allocation of parental responsibilities and parenting time. Iowa continues to use terms such as legal custody and physical care. In either state, courts generally evaluate two practical questions:
1. Decision-Making Responsibility
This is the authority to make major decisions about your child's life, including:
- Education: school choice, IEPs, tutoring, college planning
- Healthcare: doctors, medications, mental health treatment, surgeries
- Religion: religious upbringing, attendance, ceremonies
- Extracurricular activities: sports, clubs, lessons, travel teams
In Illinois, this is called the allocation of significant decision-making responsibilities. In Iowa, it's called legal custody.
2. Parenting Time (Physical Custody / Physical Care)
This is where and when your child physically lives. It includes the regular weekly schedule, holidays, school breaks, summer vacations, transportation, and exchanges. In Illinois it's called parenting time; in Iowa it's referred to as physical care (primary, joint, or shared).
Many parents are surprised to learn that decision-making and parenting time are evaluated separately. It's entirely possible to share major decisions while one parent has the majority of overnights, or vice versa.
The Guiding Standard: Best Interests of the Child
Both Illinois and Iowa courts use the best interests of the child standard for custody and parenting decisions. Once parentage and legal rights are established, neither state favors one parent based on gender. The law focuses on what arrangement best supports the child's safety, stability, emotional needs, and long-term well-being.
In Illinois
Illinois judges consider a long list of statutory factors, including:
- The wishes of the child, based on maturity and ability to express a reasoned preference
- The wishes of each parent
- The child's adjustment to home, school, and community
- The mental and physical health of all involved
- The child's needs
- The distance between the parents' residences and the practical effect on the child's daily schedule
- Each parent's willingness and ability to facilitate a close relationship with the other parent
- Any prior agreements or significant decision-making history between the parents
- Each parent's level of past involvement in caretaking during the prior 24 months
- Each parent's ability to cooperate or, conversely, the level of conflict between them
- Any history of abuse, violence, or threats against the child or household members
- Whether either parent is a sex offender, and the nature of the offense
Importantly, Illinois courts do not base custody decisions on race, religion, parental income, or past marital misconduct, unless the issue directly affects the child's safety, needs, or best interests. Income alone does not determine custody, though courts may consider whether each parent can meet the child's needs.
In Iowa
Iowa courts must order a custody arrangement that gives the child the opportunity for the maximum continuing physical and emotional contact with both parents, unless contact with a parent is likely to cause physical or significant emotional harm.
Iowa law also strongly favors joint legal custody. If either parent requests it, the court must consider it, and the court must cite clear and convincing evidence before denying it. When evaluating joint custody, Iowa judges weigh:
- Whether each parent would be a suitable custodian
- Whether the child's psychological and emotional development would suffer from a lack of contact with either parent
- Whether the parents can communicate effectively about the child's needs
- Whether both parents have actively cared for the child before and since the separation
- Whether each parent can support the other parent's relationship with the child
- Whether the arrangement aligns with the child's wishes (considering age and maturity)
- Whether one or both parents agree to or oppose joint custody
- The geographic proximity of the parents
- Whether the safety of the child, other children, or the other parent will be jeopardized
- Whether a history of domestic abuse exists
A finding of domestic abuse in Iowa creates a rebuttable presumption against joint custody and outweighs every other factor.
How Custody Is Actually Decided: The Process
Even though every case is different, most custody determinations follow a similar path.
Step 1: File for Custody (or Divorce)
Custody can be addressed inside a divorce case or in a stand-alone parentage/custody action for unmarried parents. The filing parent typically submits a proposed parenting plan or position statement at or near the start of the case.
Step 2: Temporary Orders
Because cases can take months to resolve, courts often issue temporary orders to provide stability while the case is pending. These cover where the child lives, the parenting time schedule, decision-making authority, and child support. Temporary orders aren't binding at trial, but they often set the tone for the final result.
Step 3: Mediation and Negotiation
Both Illinois and Iowa strongly encourage and may require mediation in contested custody cases. A neutral mediator helps parents try to craft their own parenting plan rather than leaving the decision to a judge.
Step 4: Investigations and Evaluations (If Needed)
In contested cases, the court may appoint professionals or order evaluations depending on state law, county practice, and the issues in dispute. These may include:
- A Guardian ad Litem (GAL), attorney for the child, or similar court-appointed professional to address the child's best interests, depending on the state and county
- A custody evaluator (often a psychologist) to assess each parent and the child
- A parenting coordinator or similar professional where authorized and appropriate to help manage ongoing conflict
These professionals interview the parents, observe the child, review records, and submit reports or recommendations to the court.
Step 5: Settlement or Trial
Most custody cases settle before trial. When they don't, the judge holds a hearing, considers the evidence and the statutory factors, and enters a final allocation judgment (Illinois) or custody decree (Iowa) that includes a detailed parenting plan.
What Courts Look At in Practice
Beyond the statutory factors, judges pay close attention to real-world details, including:
- Day-to-day caregiving history: Who handles school drop-offs, doctor visits, homework, bedtime, and discipline?
- Stability: Housing, employment, schedule consistency, support network
- Communication and cooperation: Whether the parents can co-parent without involving the child in conflict
- Co-parenting behavior: Speaking respectfully about the other parent, encouraging the relationship, and following existing orders
- Safety: Any history of abuse, neglect, untreated mental illness, or substance misuse
- The child's voice: Especially for older children, judges may weigh the child's reasoned preferences, though never as the deciding factor
What Courts Will Not Consider
It's just as important to know what factors generally should not drive the decision. In Illinois and Iowa, courts generally will not base custody decisions on:
- Parental income alone: Wealthier parents do not automatically get more time, though each parent's ability to meet the child's needs may still matter
- Race or ethnicity
- Religion, unless religious practices directly endanger the child
- Past marital misconduct (e.g., affairs), unless it directly impacts the child
Can Custody Be Changed Later On?
Yes. As children grow and family circumstances change, custody arrangements can be modified, but only under specific legal standards.
- In Illinois, modification standards depend on the type of change requested and the timing. Many significant changes require a substantial change in circumstances, while some minor or agreed schedule changes may be handled differently.
- In Iowa, modifications require a substantial and material change in circumstances that was not anticipated when the original order was entered, that is permanent, and that is in the child's best interests.
Common reasons for modification include relocation, changes in a parent's work schedule, new safety concerns, the child's evolving needs, or persistent violations of the existing order.
Practical Tips for Parents Entering a Custody Case
- Stay child-focused. Judges quickly recognize parents who treat the case as a contest versus those who genuinely prioritize the child.
- Document your involvement. Keep records of school events, medical appointments, parenting time, and communications.
- Communicate carefully. Assume every text, email, and social media post could end up in front of a judge.
- Follow temporary orders exactly. Even small violations can hurt your credibility.
- Don't disparage your co-parent in front of your child. Courts view it as harmful to the child and damaging to your case.
- Work with an experienced family law attorney early. The decisions made in the first 30–60 days of a case often shape the final outcome.
Final Thoughts
Custody decisions are some of the most consequential decisions a court will ever make for your family. Understanding how the law works including what judges must consider, what they can't consider, and how the process unfolds can put you in a stronger position to advocate for your child and protect your relationship with them.
If you're facing a custody case in Illinois or Iowa, you don't have to navigate it alone. The attorneys at Greenwood Law help parents build strong parenting plans, present persuasive evidence, and pursue outcomes that protect what matters most: their children. Contact us today for a consultation to talk through your situation and your options.