Legal Custody vs Physical Custody in Montana: What the Terms Actually Mean

If you search for "joint custody" or "sole custody" in Montana, you will find national articles that do not match what Montana's courts actually use. In 1997, Montana eliminated "custody" and "visitation" from its family law code entirely. Understanding what replaced them is critical to filling out your parenting plan correctly.

Montana's Replacement Terms

The shift was intentional: the legislature found that "winner-take-all" custody labels escalated conflict between parents and harmed children.

Decision-Making Authority (Formerly Legal Custody)

Decision-making authority covers three categories:

1. Education — school enrollment, special education services, tutoring
2. Healthcare — medical treatment, therapy, dental care, medications
3. Spiritual development — religious instruction and participation

These can be allocated in different combinations:

• Shared (joint): Both parents must agree on major decisions in all three categories. This is the default when parents can communicate effectively.
• Sole: One parent has final authority over some or all categories. Courts order this when communication has broken down, when there is a history of abuse or substance use, or when one parent consistently obstructs the decision-making process.
• Divided: Each parent has sole authority over specific categories — for example, one parent handles medical decisions while the other handles education.

Regardless of how decision-making is allocated, the parent with the child during their scheduled parenting time makes routine daily decisions (meals, bedtime, homework, clothing) without needing the other parent's approval.

Residential Schedule (Formerly Physical Custody)

The residential schedule is the part of the parenting plan that specifies exactly when the child lives with each parent. Montana does not have a legal presumption of 50/50 parenting time — the court tailors the schedule to the child's best interests.

Common schedule patterns include:

• 2-2-3 rotation: Parent A gets Monday–Tuesday, Parent B gets Wednesday–Thursday, and parents alternate Friday–Sunday. The child is never away from either parent for more than three days.
• Alternating weeks: The child spends one full week with each parent, transitioning on Sunday evenings.
• Primary residence with scheduled parenting time: The child lives primarily with one parent and spends designated weekends, midweek evenings, and holidays with the other parent.

The schedule you propose in your parenting plan directly affects child support. If both parents have more than 110 overnights per year, child support is calculated using the shared parenting Worksheet B. If one parent has 110 or fewer overnights, the standard Worksheet A applies.

There Is No "Default" to Joint or Sole

Montana courts do not start with a presumption of either shared or sole arrangements. The judge evaluates the 13 best-interest factors under MCA § 40-4-212 and crafts an arrangement that fits the family's circumstances. Parents who propose a reasonable, specific plan and demonstrate a willingness to cooperate generally receive more parenting time than parents who are adversarial or obstructive.

Why the Terminology Matters

When you fill out Form MP-300 (Proposed Parenting Plan), the form asks you to specify your proposals for "decision-making authority" and "residential schedule." It does not ask about "custody" or "visitation." Parents who do not understand the translation waste time proposing arrangements using language the court does not use — and risk having their plan sent back for revision.

Get the Translation Right

The Montana Child Custody & Parenting Plan Guide maps every traditional custody concept to Montana's actual statutory terms and walks you through each section of the MP-300 form with pre-written language you can adapt to your situation.

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