How Alaska Calculates Child Support
Alaska uses the Percentage of Obligor Income model to determine child support obligations. This page explains the guidelines, formula, and key factors.
Model Type
Percentage of Obligor Income (Alaska Civil Rule 90.3)
Presumptive support is a percentage of obligor’s adjusted annual income (varies by number of children); shared/divided custody uses different formulas in Rule 90.3.
Income Basis & Definitions
adjusted annual income (obligor)
Selects the Rule 90.3 percentage.
Source: Rule 90.3(a) percentage scheduleTotal income from all sources used to compute adjusted annual income.
Source: Rule 90.3(a)(1) total incomeMandatory taxes and other specified deductions to compute adjusted annual income.
Source: Rule 90.3(a)(1)(A)-(E) allowable deductionsParenting Time Handling
Primary/shared/divided custody determines formula.
Source: Rule 90.3(a)-(b) custody formulasShared custody formula uses each parent’s custody days/overnights.
Source: Rule 90.3(b) shared custody inputsDeductions & Adjustments
Prior support obligations/other dependents may affect adjusted income or deviations.
Source: Rule 90.3(c) variance criteria / commentaryIf spousal support affects available income, treat as deviation input per rule/commentary.
Source: Rule 90.3(c) variance criteriaAdd-Ons & Allocation
Health insurance premiums and uninsured medical allocated/ordered.
Source: Rule 90.3(d) medical/insuranceCaps, Minimums & Deviations
High-income handling and variances per Rule 90.3(c) and commentary.
Source: Rule 90.3(c) variations / high income commentaryVariance requires findings under Rule 90.3(c).
Source: Rule 90.3(c)(1) variance criteria