Alaska Rule 90.3: 20% for 1 child, 27% for 2, 33% for 3, +3% for each additional. Applied to obligor adjusted annual income. Cap: $138,000/year ($11,500/month).
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Alaska calculates child support using the Percentage of obligor adjusted income (hard-coded) established under Civil Rule 90.3. This is a statutory formula that leaves limited room for judicial discretion on the base calculation amount, ensuring consistency and predictability for families across the state.
Obligor adjusted monthly income x Rule 90.3 percentage.
The calculation begins with determining each parent's net disposable income, which includes virtually all sources of income minus taxes, mandatory payroll deductions, and certain hardship deductions. The court then applies the statutory formula using the time each parent has primary physical responsibility for the children and the applicable income allocation brackets.
Beyond the base formula amount, Alaskarequires additional contributions for mandatory add-on expenses. These typically include childcare costs necessary for the custodial parent's employment or education, uninsured healthcare expenses for the children, and in some cases, educational and travel costs. These add-ons are split between parents in proportion to their respective incomes.
Primary statute: Civil Rule 90.3
20/27/33/+3% of obligor adjusted income.
$138,000 annual income cap.
Adjusted = gross - fed tax - FICA - mandatory retirement - health insurance.
No state income tax.
Hard-codable percentages (like Texas).
No state income tax.
PFD is income for support purposes.
Answer a few questions about your income, custody, and children. Get your personalized estimate.
Residency Requirement
NO minimum residency — just be a resident when filing
Mandatory Waiting Period
No mandatory waiting period
No-Fault Ground
Incompatibility of temperament
State Income Tax
No state income tax.
Alaska uses the Percentage of obligor adjusted income (hard-coded) under Civil Rule 90.3. Alaska Rule 90.3: 20% for 1 child, 27% for 2, 33% for 3, +3% for each additional. Applied to obligor adjusted annual income. Cap: $138,000/year ($11,500/month).
Key factors include both parents' income, the number of children, custodial time share, mandatory add-on expenses (childcare, health insurance), and any applicable deductions. 20/27/33/+3% of obligor adjusted income.
Yes. Either parent can request a modification if there has been a material change in circumstances, such as a significant change in income, custody arrangements, or the needs of the child. The court will recalculate support using the same statutory formula.
Obligor adjusted monthly income x Rule 90.3 percentage.
Get a personalized child support calculation based on Alaska's actual statutory formula.
Start My Free AlaskaEstimate →This tool provides educational estimates based on Alaska family law and does not constitute legal advice. Child support calculations are approximations of the statutory formula and may differ from court-ordered amounts. Consult a licensed Alaska family law attorney before making decisions. Primary statute: Civil Rule 90.3.