Montana Best Interests of the Child: The 13 Factors Courts Use to Decide Custody

When Montana parents cannot agree on a parenting plan, the District Court decides based on the "best interests of the child" standard under MCA § 40-4-212. This is not a vague, subjective judgment — the statute lists 13 specific factors the judge must evaluate. Understanding these factors before you propose your parenting plan or walk into mediation gives you a significant advantage.

The 13 Statutory Factors

1. Wishes of the Parents

The court examines both parents' proposed plans. A parent who submits a detailed, workable plan demonstrating cooperation earns more credibility than one who demands full control or refuses to compromise.

2. Wishes of the Child

There is no magic age in Montana where a child "chooses" which parent to live with. A child's preferences are considered, but the weight the judge gives them depends on the child's age, maturity, and whether the preference appears to be the child's own or coached by a parent.

3. Relationships and Interactions

The court looks at the child's bonds with each parent, with siblings, with stepparents, and with any other person who significantly affects the child's life. Keeping siblings together is usually preferred unless there is a compelling reason to separate them.

4. Adjustment to Home, School, and Community

Courts are reluctant to disrupt a child's established routine. If a child is thriving in their current school and neighborhood, the judge is less likely to approve a schedule that requires moving the child to a new district — unless there is a strong countervailing reason.

5. Mental and Physical Health of All Parties

This factor examines both parents' fitness and any special needs of the child. A mental health diagnosis alone does not disqualify a parent — the court looks at whether the condition is managed and whether it affects the parent's ability to care for the child.

6. Physical Abuse or Threats of Abuse

Any documented history of physical violence or credible threats of harm against the child or the other parent heavily weighs against the abusive parent. Under Brody's Law (2025), Montana courts must prioritize child safety and apply trauma-informed analysis in cases involving abuse allegations.

7. Chemical Dependency or Substance Abuse

Documented substance abuse — including DUI convictions, positive drug tests, or evidence of chronic alcohol abuse — is scrutinized as a direct threat to child safety. The court may order substance abuse evaluations and restrict parenting time to supervised contact until the parent demonstrates sustained recovery.

8. Continuity and Stability of Care

This factor favors the parent who has historically been the primary caregiver. If one parent has been responsible for daily routines — school transport, meals, bedtime, medical appointments — the court considers that continuity important for the child's development.

9. Developmental Needs of the Child

The court evaluates whether each parent's proposed schedule aligns with the child's age-specific needs. An infant needs shorter, more frequent contact with both parents. A teenager needs a schedule that accommodates school, extracurriculars, and social life.

10. Failure to Pay Birth-Related Costs

A parent who knowingly failed to pay birth-related costs when financially able to do so acts contrary to the child's best interests. This factor applies primarily to unmarried-parent cases.

11. Failure to Financially Support the Child

Knowingly failing to pay court-ordered child support or necessary expenses for the child weighs against the non-paying parent.

12. Frequent and Continuing Contact

Montana's stated policy is that children benefit from ongoing contact with both parents — unless a hearing demonstrates that contact would be physically or emotionally harmful. A parent who actively supports the child's relationship with the other parent satisfies this factor. A parent who obstructs contact, speaks negatively about the other parent in front of the child, or discourages communication undermines it.

13. Vexatious Amendment Filings

Parents who repeatedly file frivolous motions to modify the parenting plan — particularly within six months of a prior child support order — are presumed to be acting in bad faith. The court can assess attorney's fees against the filer.

How to Use These Factors

You do not need to "win" on all 13 factors. The judge weighs them collectively, and some carry more weight than others depending on the facts of your case. But you should be able to address each one in your proposed parenting plan:

• Document your involvement as a caregiver (factor 8)
• Propose an age-appropriate schedule (factor 9)
• Show willingness to cooperate (factors 1 and 12)
• Be honest about challenges — courts respect transparency over defensiveness (factors 5 and 7)

Build Your Case Around the Factors

The Montana Child Custody & Parenting Plan Guide includes a best-interest documentation log that maps directly to these 13 factors — helping you organize evidence, prepare for mediation, and build a parenting plan proposal the judge can approve.

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