Alaska Child Support Calculator

Estimate Alaska child support for 2026 using the Percentage of Income (Flat) guideline model under Alaska R. Civ. P. 90.3. Enter both parents' incomes and the parenting-time split to see what you may owe or receive.

Alaska uses a flat Percentage of Income model under Civil Rule 90.3. Support is calculated as a fixed percentage of the non-custodial parent's adjusted income, 20% of adjusted income for one child, 27% for two, 33% for three. The custodial parent's income is generally not factored into the base obligation.

Alaska's base formula is built around one parent paying a flat percentage of adjusted income, so for most schedules the obligor's parenting time does not lower the number. The big shift happens at shared physical custody, defined as the obligor having the child for at least 30% of overnights, which triggers a separate shared-custody formula under Civil Rule 90.3 that accounts for both parents' incomes and time. Hybrid arrangements with multiple children split between homes are also addressed in Rule 90.3. The calculator on this page is only an estimate, so run your real overnight count through the official worksheet.

The cost of providing the child's health insurance is treated as a child-support add-on under Civil Rule 90.3 rather than being baked into the base percentage. A court order will typically state which parent carries coverage, and the premium attributable to the child is factored in and shared between the parents. Out-of-pocket and uninsured medical costs are also commonly allocated by the court. Because exact figures depend on your order, confirm health insurance handling on the official Alaska worksheet or with the Alaska Child Support Services Division (CSSD).

Work-related and education-related child care, such as daycare that lets a parent earn income, is handled as an add-on under Alaska's Civil Rule 90.3 and is not part of the flat base percentage. These reasonable care costs are generally divided between the parents and added to the support figure. The exact split depends on the parents' circumstances and what the court approves. This page's tool gives a rough estimate only, so list your actual child care costs on the official worksheet so the controlling number reflects them.

Alaska judges start from the guideline number produced by Civil Rule 90.3, but the rule lets a court deviate when applying the standard formula would be unjust or would not serve the child's best interests, for reasons such as extraordinary expenses or unusual income situations. The parent asking for a deviation carries the burden of showing good cause, and the court must put its reasons in writing. Deviations are the exception, not the norm. Treat any figure from this calculator as an estimate, and let the official worksheet and a licensed Alaska attorney control the final result.

Frequently asked questions

How is child support calculated in Alaska?

Alaska uses a flat Percentage of Income model under Civil Rule 90.3. Instead of blending both parents' incomes for a basic schedule, the base obligation is a fixed percentage of the paying parent's adjusted income, set at 20% for one child, 27% for two, and 33% for three children. The custodial parent's income generally does not change this base figure. Adjusted income means total income from all sources minus allowable deductions like taxes and certain other items. The estimate shown on this page follows that structure, but the official Alaska worksheet and a licensed attorney control the actual order.

Is there an official Alaska child support worksheet I have to use?

Yes. Alaska's Civil Rule 90.3 worksheet, used alongside the Alaska Child Support Services Division (CSSD) calculator, is the controlling form for setting support, and the court relies on it rather than any informal estimate. You can reach the official CSSD calculator at childsupport.alaska.gov and the rule itself in the Alaska Rules of Civil Procedure. The self-represented help materials at the Alaska Court System site walk you through completing it. The tool on this page is only a quick estimate to help you prepare, so always verify your figures on the official worksheet before filing or relying on a number.

How does a 30% or more overnight schedule change support in Alaska?

Alaska treats shared physical custody as a real turning point. Once the paying parent has the child for at least 30% of overnights in the year, the case moves out of the standard flat-percentage calculation and into a separate shared-custody formula under Civil Rule 90.3. That formula considers both parents' incomes and the division of time, which usually changes the result compared with a primary-custody order. Below the 30% overnight mark, the flat percentage still governs. Because overnight counts drive this, run your actual schedule through the official Alaska worksheet rather than relying only on this page's estimate.

What income counts when Alaska sets adjusted income?

Under Civil Rule 90.3, Alaska starts with total income from all sources and subtracts allowable deductions such as federal, state, and local taxes, mandatory retirement contributions, union dues, and any child or spousal support a parent is actually paying. A distinctive Alaska point is that the Permanent Fund Dividend is included as income. Bonuses, overtime, and self-employment earnings generally count too, since the rule reaches all sources. The Alaska Child Support Services Division (CSSD) and the court use this adjusted figure to apply the percentages. This calculator approximates that math, but the official worksheet controls.

When can an Alaska child support order be modified?

Either parent or the Alaska Child Support Services Division (CSSD) can ask to change an order, but Alaska uses a clear yardstick: a roughly 15% difference between your existing order and a fresh Civil Rule 90.3 calculation is the standard threshold for modification. A meaningful change in income, custody, or other circumstances often produces that gap. You file the request in the court that issued the order, or CSSD can handle a review administratively. Use this page's estimate to see whether your numbers have shifted enough, then confirm with the official worksheet and, if needed, an attorney.

When does child support end in Alaska?

In Alaska, a support obligation generally ends when the child turns 18. It can extend to age 19 if the child is unmarried, actively pursuing a high school diploma or its equivalent, and still living as a dependent with a parent or guardian. The obligation does not automatically stretch into typical college years beyond that. Because the cutoff depends on the child's specific situation, check your order and the Civil Rule 90.3 provisions carefully. The estimate here does not decide an end date, so rely on your court order and a licensed Alaska attorney for that determination.

How does Alaska enforce a child support order if a parent stops paying?

The Alaska Child Support Services Division (CSSD) has strong collection tools. It enforces orders through immediate wage withholding, interception of the Permanent Fund Dividend, license suspension, federal and state tax refund interception, and referrals to court for civil contempt. Past-due amounts, or arrears, remain owed and continue to be collected through these methods even after the current obligation changes. If a paying parent moves out of state, interstate rules help Alaska keep enforcing the order. This page's calculator only estimates ongoing support and does not calculate arrears or enforcement actions, which CSSD and the court handle.