Legal Custody vs Physical Custody in Alaska

Legal Custody: Who Makes the Big Decisions

Legal custody is about authority over major life decisions — education, non-emergency healthcare and mental health treatment, religious upbringing, and extracurricular activities. It has nothing to do with where the child sleeps on a given night.

Alaska courts strongly favor joint legal custody, meaning both parents share equal decision-making power and must consult each other on these big-picture issues. The legislature has established this as public policy, grounded in the assumption that children benefit from both parents guiding their development.

Joint legal custody only works when parents can communicate constructively. If conflict is so severe that parents can't discuss the child's welfare, or if one parent is found unfit, the court will award sole legal custody — one parent decides without consulting the other.

Physical Custody: Where the Child Lives

Physical custody defines the child's residential schedule: which parent has the child on which nights, who handles daily meals, bedtime routines, and school pickups. Civil Rule 90.3 breaks physical custody into categories based on annual overnight counts:

• Primary physical custody — one parent has 256 or more overnights per year (70%+). Child support is calculated as a flat percentage of the non-custodial parent's income alone.
• Shared physical custody — each parent has at least 110 overnights (30%+). Both parents' incomes factor into a mutual offset calculation with a 1.5 multiplier.
• Divided physical custody — each parent has primary custody of at least one child, but no single child is shared between households.
• Hybrid physical custody — at least one child is in shared custody while another is in primary custody with one parent.

Why the Combination Matters

Legal and physical custody operate independently, which creates several possible arrangements:

• Joint legal + shared physical — both parents decide together and the child splits time roughly evenly. This is what most people picture when they hear "joint custody."
• Joint legal + primary physical — both parents make major decisions together, but the child lives primarily with one parent. This is the most common arrangement in Alaska.
• Sole legal + primary physical — one parent has full decision-making authority and the child lives with them. Typically reserved for cases involving domestic violence, severe substance abuse, or complete communication breakdown.

A parent with "only" alternating weekends and one weekday evening (roughly 80-90 overnights) still holds equal say in their child's education and medical care if the court awards joint legal custody. Many parents conflate losing overnight time with losing decision-making power — they're separate questions with separate criteria.

The 110-Overnight Line

The sharpest practical consequence of the physical custody categories is financial. At 109 overnights, the non-primary parent pays a flat percentage of their income (20% for one child, 27% for two). At 110 overnights, the shared-custody formula kicks in and typically reduces the obligation because both incomes are weighed and offset against each other.

This "cliff effect" can tempt parents to negotiate overnights based on child support math rather than the child's developmental needs. Courts watch for this, and a schedule that seems designed to hit a financial threshold rather than serve the child's best interests may not survive judicial scrutiny.

The Alaska Custody & Parenting Plan Guide includes an overnight tracking worksheet and worked child support examples for both primary and shared arrangements, so parents can see exactly how their proposed schedule maps to the Rule 90.3 categories.

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