Calculation is client-side, income figures are never transmitted or stored.
How Alaska Child Support Is Calculated
- Alaska is a flat-percentage-of-income state (not income shares): the child support award is a percentage of the NON-CUSTODIAL parent's own adjusted annual income only -- the custodial parent's income is not part of the base calculation.
- "Adjusted annual income" starts from total income and subtracts mandatory deductions (income tax, Social Security/self-employment tax, Medicare tax, mandatory union dues and retirement contributions), work-related child care costs for the children, health/life insurance premiums (within limits), and support already owed for other children.
- Multiply adjusted annual income (capped at $138,000/year, or $11,500/month) by the percentage for the number of children: 20% for one child, 27% for two, 33% for three, plus an extra 3% for each additional child.
- The minimum child support award is $50/month, regardless of income.
- This is Rule 90.3(a)'s primary-custody calculation only; shared, divided, or hybrid custody (Rule 90.3(b)) use a materially different formula involving both parents' figures and are not modeled here.
Alaska Child Support Worksheet Walkthrough
Example: the non-custodial parent has an adjusted net income of $4,500/month, and there are two children.
- Adjusted monthly income ($4,500) is below the $11,500/month cap, so the full amount is used.
- Percentage for two children: 27%.
- Child support award: $4,500 x 27% = $1,215/month.
How This Calculator Works — Formula & Constants
Source: Alaska Court System — Alaska Civil Rule 90.3 · Calcul déterministe — no AI, no arbitrary estimate.
Constants used
| Constant | Value | Source |
|---|---|---|
| 1 child | 20% | Alaska Civil Rule 90.3(a) |
| 2 children | 27% | Alaska Civil Rule 90.3(a) |
| 3 children | 33% | Alaska Civil Rule 90.3(a) |
| 4 children | 36% | Alaska Civil Rule 90.3(a) |
| 5 children | 39% | Alaska Civil Rule 90.3(a) |
| 6+ children | 42% | Alaska Civil Rule 90.3(a) |
| Minimum order | $50/mo | Alaska Civil Rule 90.3(a) |
| Net income cap | $11,500/mo | Alaska Civil Rule 90.3(a) |
Formula
pct = (obligor_net_income < 0) ? low_income_percentages[children] : percentages[children]
monthly_support = net_resources × pct
Deterministic calculation based on Alaska's official guideline schedule. Verify against Alaska's official calculator for a court-ready figure.
FAQ
How is child support calculated in Alaska?
Alaska is a flat-percentage-of-income state (not income shares): the child support award is a percentage of the NON-CUSTODIAL parent's own adjusted annual income only -- the custodial parent's income is not part of the base calculation. "Adjusted annual income" starts from total income and subtracts mandatory deductions (income tax, Social Security/self-employment tax, Medicare tax, mandatory union dues and retirement contributions), work-related child care costs for the children, health/life insurance premiums (within limits), and support already owed for other children. Multiply adjusted annual income (capped at $138,000/year, or $11,500/month) by the percentage for the number of children: 20% for one child, 27% for two, 33% for three, plus an extra 3% for each additional child. The minimum child support award is $50/month, regardless of income. This is Rule 90.3(a)'s primary-custody calculation only; shared, divided, or hybrid custody (Rule 90.3(b)) use a materially different formula involving both parents' figures and are not modeled here.
Does Alaska use combined parental income like most states?
No. Alaska Civil Rule 90.3(a) calculates the award as a flat percentage of the NON-CUSTODIAL parent's own adjusted income only -- the custodial parent's income does not factor into the primary-custody calculation, unlike income-shares states such as Texas or Georgia.
What counts as a parent's "adjusted annual income" in Alaska?
Total income from all sources, minus mandatory deductions (taxes, Social Security, Medicare, mandatory retirement contributions), work-related child care costs, certain health and life insurance premiums, and support already paid for other children (Rule 90.3(a)(1)).
Is there a different rule for low-income parents in Alaska?
Yes. Under Rule 90.3(a)(5), a parent with total annual income of $30,000 or less may use the LESSER of the standard itemized-deduction calculation or their total income minus $7,500/year as their adjusted income -- often producing a lower support amount. This calculator does not model that alternate calculation; consult Alaska's official child support calculator or a family law attorney if this may apply to you.
Methodology & Source
Formula model: percentage of income. Effective 2023-10-16, guideline version 2023-AK-v1, last reviewed 2026-07-13.
Official source: Alaska Court System — Alaska Civil Rule 90.3 (Alaska Civil Rule 90.3(a)).
This calculator models Alaska Civil Rule 90.3(a), the PRIMARY PHYSICAL CUSTODY calculation only, applied to a single non-custodial parent's already-adjusted net income. It does not model: the Rule 90.3(a)(5) Low-Income Adjustment (parents with total annual income of $30,000 or less may use total income minus $7,500/yr instead of the standard itemized-deduction adjusted income, whichever is lower -- this requires a gross-income-and-deductions breakdown beyond this calculator's single net-income input); the Rule 90.3(a)(3) Extended Visitation Credit (discretionary, up to 75% reduction for periods of 27+ consecutive days); Shared, Divided, or Hybrid Physical Custody (Rule 90.3(b), an entirely different calculation requiring both parents' figures and a 1.5x multiplier); or the grandparent-support provision (Rule 90.3(c)(4)). Courts may also vary the award for good cause under Rule 90.3(c)(1).
Guideline figures transcribed from the primary source above and cross-checked against Alaska's official calculator/worksheet for multiple test scenarios — see our verification methodology.