Alaska Child Support Calculator and
Guidelines Worksheet

How much is child support in Alaska? Alaska uses the Income Shares model under Alaska Civil Rule 90.3. The guideline formula applies to the non-custodial parent's adjusted monthly income with a percent-of-income component: approximately 20% for 1 child, 27% for 2, 33% for 3.

A non-custodial parent earning $4,000/month adjusted income would owe approximately $800/month for 1 child. The formula also credits periods of extended parenting time.

Add health insurance and childcare costs.

When does child support end in Alaska? Under Alaska Civil Rule 90.3(a)(4), child support ends when the child turns 18. If the child has not graduated from high school at 18, support continues until graduation or age 19, whichever comes first.

Alaska courts can also order support for a disabled child beyond age 18 in appropriate cases. Post-secondary support must be agreed to by the parents in their divorce agreement or requested from the court separately.

Alaska's Percentage of Income calculation starts with determining the non-custodial parent's income. Depending on whether Alaska uses a flat or varying percentage model, the court either applies a single percentage regardless of income level or uses a sliding scale where the percentage decreases as income rises.

The specific percentages and income thresholds are set forth in Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three, providing a clear framework that both parents can reference.

For a flat percentage model, the calculation is straightforward: if the statutory rate for one child is, for example, 20% and the obligor's net monthly income is $5,000, the child support payment would be $1,000 per month. For two or more children, the percentage typically increases — the exact rates for Alaska are set forth in Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three and should be verified against the current schedule.

The varying percentage model applies different rates at different income brackets, producing a more graduated obligation.

While the custodial parent's income is not part of the primary calculation in Alaska's model, it may become relevant in deviation proceedings. Courts can adjust the guideline amount based on the child's healthcare needs, childcare expenses, and the custodial parent's ability to cover day-to-day costs.

The simplicity of the percentage-based approach makes it efficient for courts to process, but the deviation framework ensures that exceptional circumstances receive individualized attention.

The number of children is the most direct factor in any Alaska child support calculation under the child support guidelines in Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three. The basic child support obligation increases with each additional child, though not in a strictly linear fashion.

The amount of child support also depends on each parent's monthly gross income, which includes wages, salary, commissions, bonuses, and other recurring sources. The noncustodial parent's share is calculated based on their proportion of the combined monthly gross income.

Health care and child care costs play a major role. The parent who carries the child's health insurance receives a credit or offset, and unreimbursed medical expenses exceeding a threshold are typically split between the parents.

Child care costs necessary for employment or education are added to the basic child support obligation and divided proportionally between parents.

Children with special needs — whether physical, developmental, or educational — can significantly increase the amount of child support. Alaska courts operating under Alaska R.

Civ. P.

90.3 have discretion to deviate upward from the guideline amount when a child requires therapies, specialized schooling, or ongoing medical treatment that exceeds ordinary expenses. Similarly, extracurricular activities and private school tuition may be considered, though courts vary in how they treat these costs.

High-income cases present unique challenges. Where Alaska's schedule under Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three sets a maximum combined income threshold, courts exercise independent discretion above that cap rather than applying the standard table.

When a parent is voluntarily unemployed or underemployed, Alaska courts may impute income — assigning an earning capacity based on the parent's education, work history, job market conditions, and prior earnings — to prevent artificially lowering the child support amount by choosing not to work or accepting a lower-paying job without justification.

Alaska's child support obligation generally continues until the child reaches the age of majority under state law — check Alaska R. Civ.

P. 90.3 for the specific cutoff age, which may extend beyond 18 in certain circumstances such as a child still in high school or college.

Support may also end earlier if the child becomes emancipated through marriage, military service, or court order.

Either parent may petition the court under Alaska R. Civ. P. 90.3 to modify a child support order when there has been a material change in circumstances. Common triggers include:

• A significant income change for either parent (a material change in circumstances — such as a significant income shift, change in custody arrangement, or change in the child's needs — is generally required to modify the existing order; the exact threshold under Alaska R. Civ. P. 90.3 controls for Alaska)
• Loss of employment or onset of a disability
• A significant change in the child's medical, educational, or developmental needs
• A substantial change in the custody or parenting-time arrangement

The parent seeking modification bears the burden of proving that circumstances have genuinely changed since the last order.

Modifications in Alaska under Alaska R. Civ.

P. 90.3 are not automatic — even when circumstances change, the existing order remains in effect until a court enters a new one.

Filing promptly matters because modifications typically take effect from the date of the petition, not retroactively to when the change occurred. Parents who delay filing risk accumulating arrears under the original order that cannot be forgiven, since federal law prohibits retroactive reduction of child support arrears.

Families navigating this process should contact a Alaska family law attorney to confirm the specific modification threshold and filing procedures that apply to their order.

Alaska has multiple enforcement mechanisms under Alaska R. Civ.

P. 90.3 to ensure child support is paid.

The most common tool is income withholding (wage garnishment), which is now mandatory for most new and modified child support orders. Under an income withholding order, the obligor's employer deducts the support amount directly from their paycheck and sends it to the state disbursement unit.

This approach removes the obligation from the paying parent's discretion and provides the custodial parent with reliable, timely payments.

When wage garnishment is insufficient or the obligor is self-employed, Alaska can pursue additional enforcement actions:

• Intercepting federal and state tax refunds
• Placing liens on real and personal property
• Suspending driver's licenses and professional or occupational licenses
• Denying or revoking passport applications for arrears exceeding $2,500
• Reporting delinquent obligors to credit bureaus

Each tool creates significant practical consequences that apply without a separate court hearing.

In severe cases, Alaska courts may hold a non-paying parent in contempt of court, which can result in fines, community service, or incarceration. Repeated willful failure to pay can lead to criminal prosecution under both state and federal law.

The Deadbeat Parents Punishment Act makes it a federal crime to willfully fail to pay child support for a child living in another state when the arrearage exceeds $5,000 or has been unpaid for more than one year. The federal Office of Child Support Services (OCSE) can assist custodial parents with enforcement at no cost.

To contact the Alaska child support program directly, use the OCSE state programs directory.

The amount of parenting time each parent exercises directly affects the child support calculation in Alaska. When the non-custodial parent has the child for a significant number of overnights — typically 25% or more of the year (approximately 92 overnights in many jurisdictions) — Alaska's guidelines under Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three apply a shared-custody or parenting-time adjustment that reduces the non-custodial parent's obligation.

A parent who has the child more often incurs more direct expenses for housing, food, and daily needs, so the transfer payment to the other parent reflects that shared financial responsibility.

In cases where parents share custody equally (50/50), Alaska courts typically still calculate support based on the income differential between the parents. The higher-earning parent generally pays support to the lower-earning parent, even in a true 50/50 arrangement, because the child's standard of living should be roughly comparable in both households.

The amount is usually significantly lower than in a traditional custody arrangement as calculated under Percentage of adjusted income of non-custodial parent: 20% for one child, 27% for two, 33% for three. Even small changes in the overnight count — such as moving from 120 to 128 overnights — can cross a threshold that triggers a meaningful change in the support calculation.

Use the Alaska Custody Time Calculator to track overnights precisely and determine which parenting time threshold applies to your schedule.