How to Modify a Custody Order in Indiana: A Step by Step Guide for 2026

Custody orders in Indiana are intended to provide stability for children, so courts do not change them lightly. A parent who wants to modify an existing custody order must meet a specific legal standard and follow a defined procedure. This guide explains the standard Indiana courts apply in 2026, what qualifies as a substantial change in circumstances, and how to file a petition for modification.

The Legal Standard for Modification

The controlling statute is Indiana Code Section 31-17-2-21. A court may not modify a child custody order unless two conditions are both satisfied:

• The modification is in the best interests of the child; and
• There has been a substantial change in one or more of the factors a court may consider under Indiana Code Section 31-17-2-8.

Both elements are required. A change in circumstances that does not serve the child's best interests will not support modification, and a change that serves the child's interests but is not "substantial" in one of the statutory factors is likewise insufficient.

The Best-Interests Factors

Indiana Code Section 31-17-2-8 lists the factors that define the best interests of the child. A court evaluating a modification petition looks for a substantial change in one or more of these:

• The age and sex of the child
• The wishes of the child's parents
• The wishes of the child, with more weight given to a child who is at least fourteen (14) years of age
• The interaction and interrelationship of the child with parents, siblings, and any other significant person
• The child's adjustment to home, school, and community
• The mental and physical health of all individuals involved
• Evidence of a pattern of domestic or family violence
• Evidence that the child has been cared for by a de facto custodian

What Counts as a Substantial Change

Whether a change is "substantial" is fact-specific, but Indiana courts have recognized a substantial change in a wide range of situations. Common examples include the following.

Relocation

A parent's planned move can be a substantial change, especially when it disrupts the existing parenting time schedule. Relocation is governed separately by Indiana Code Section 31-17-2.2, which requires a relocating parent to file and serve a notice of intent to relocate. The non-relocating parent may file a motion to modify custody or parenting time in response.

Changes in the Child's Needs

As children grow, their educational, medical, and developmental needs change. A new medical diagnosis, a change in school performance, or the evolving needs of a teenager can support modification.

Changes in a Parent's Circumstances

A significant change in a parent's work schedule, living situation, or ability to care for the child — or conduct that endangers the child's physical health or emotional development — may justify a change in custody.

Legal Custody vs Physical Custody

A modification petition may seek to change legal custody (decision-making authority over education, health care, and religion) or physical custody (where the child primarily lives), or both. The statutory standard is the same, but the relevant evidence can differ. A dispute over a child's schooling or medical care often centers on legal custody, while a dispute over the child's primary residence centers on physical custody.

How to File a Petition for Modification

Modification begins by filing a petition to modify custody in the court that issued the original order — generally the court that entered the dissolution decree or paternity order. The petition should:

• Identify the existing order and the date it was entered
• Allege the substantial change in one or more of the IC 31-17-2-8 factors
• Explain why modification is in the child's best interests
• State the specific relief requested

After filing, the petition must be served on the other parent, who has an opportunity to respond. The court may set the matter for a hearing, and in many cases will refer the parents to mediation first. QuillReady offers an Indiana Petition for Modification of Custody or Support drafted with the substantial-change allegations the statute requires.

Updating the Parenting Plan

When custody or parenting time changes, the parenting plan should be updated to reflect the new schedule, holiday allocation, and communication terms. See the Indiana Parenting Plan Template for a framework that addresses each element a court expects.

What to Expect

If the parents agree on the modification, they may submit an agreed order for the court's approval, which is generally faster. If the modification is contested, the court will hold an evidentiary hearing and decide based on the statutory standard. The parent seeking modification bears the burden of proving both the substantial change and the child's best interests.

This article is for informational purposes only and does not constitute legal advice. Consult a licensed attorney before taking any legal action.