Alaska Child Support Calculator

At $6,000 per month in obligor's monthly gross income, Alaska's guidelines produce roughly $991/month for 1 child, $1,338/month for 2 children, $1,636/month for 3 children, $1,784/month for 4 children. These figures come from running Alaska's own guideline formula, but they hold several things constant -- assumes the figure shown is the obligor's own adjusted annual income (12x the monthly figure), with 60 of 365 overnights (below the 30% shared-custody threshold, so the primary-custody percentage formula applies) and no deductions entered. Your actual number depends on both parents' incomes, your parenting-time schedule, and add-on costs like childcare and health insurance, so run the calculator for your own case.

Alaska uses the Percentage of Obligor's Adjusted Annual Income model. Alaska applies a flat percentage to the paying parent's adjusted annual income, set by the number of children -- 20% for one child up to 42% for six. Shared custody, where both parents have between 30% and 70% of the year, cross-calculates each parent's theoretical obligation and applies a 1.5× multiplier to the difference.

Alaska's guideline runs on adjusted annual income (obligor in sole custody; both parents in shared custody). That distinction matters: entering gross income into a formula built on net income (or the reverse) produces a materially wrong figure. Most states count income from essentially any regular source -- wages, self-employment, bonuses, commissions, rental and investment income, and many benefits -- not just salary.

Not necessarily. In Alaska: applies when each parent has between 30% and 70% of the year (110-255 of 365 overnights); the larger of each parent's cross-calculated share, times 1.5, sets the obligor's payment. Because the guideline also weighs each parent's share of income, a significantly higher earner can still owe support at an even time split.

This calculator's core formula has been verified against the primary source, with any unimplemented rules listed openly rather than hidden. It implements the guideline in effect as of 2018-09-13, and a human last checked it against the primary source on 2026-08-26. Sources: Alaska Civil Rule 90.3 — Child Support Awards (current as of 2023-10-16); Form DR-310 — How to Calculate Child Support Under Civil Rule 90.3. It is still an estimate, not a court order -- a judge can order a different amount, and this is not legal advice.

The Alaska guideline this calculator implements took legal effect on 2018-09-13. States revise their guidelines periodically -- federal rules require each state to review its guidelines at least once every four years -- so a figure from an older calculator or article may reflect a superseded rule.

Shared custody rounds each parent's custody-time percentage (form DR-306, Lines 3-4) to the nearest whole point before multiplying, matching the official filled-out DR-306 example (30%/70% from a 110/255-overnight split, not the exact 30.137%/69.863%) exactly. This is inferred from the example's precision rather than stated as an explicit rounding rule in Rule 90.3's text, the same kind of judgment call this codebase already documents for Pennsylvania's obligor income share. Pending verification: a 2025 Child Support Guidelines Review Committee has proposed raising Rule 90.3(c)(2)'s income cap from $138,000 to $155,000 and eliminating the $50/month minimum order under 90.3(c)(3), with public comments due 2026-10-02. Neither change is adopted as of this calculator's last verification date; this calculator implements the current, in-force figures ($138,000 cap, $50 minimum). Net income is estimated from gross using 2026 federal tax brackets and FICA (shared/ak-tax.ts) rather than requiring the sworn, documented figures Rule 90.3(e)(1) contemplates (form DR-305, with attached tax returns and pay stubs). Alaska has no state income tax, so no state-tax estimate is needed. An exact adjusted annual income can be entered directly, bypassing the estimator. The net-income estimator models only the single-filer status and the standard deduction; head-of-household and married-filing-jointly are not modeled, nor are the federal Child Tax Credit or Earned Income Tax Credit. Divided custody (90.3(b)(2)) and hybrid custody (90.3(b)(3)) are not implemented — the calculator collects a single overnight split for all children, which cannot express either arrangement. Both additionally require a mandatory judicial variance analysis under 90.3(c)(1) that this calculator does not perform. The extended visitation credit (90.3(a)(3), up to a 75% reduction for visitation periods over 27 consecutive days) is not calculated, only disclosed — it is explicitly discretionary and order-specific. Potential/imputed income for a voluntarily and unreasonably unemployed or underemployed parent (90.3(a)(4)) is not calculated — the rule sets out three threshold factors and eight amount factors, all fact-intensive. The (a)(1)(D) deduction for in-kind support of prior children in the parent's own custody is not implemented — it requires running a nested Rule 90.3 calculation for those children. The (c)(1) "manifest injustice" variance, grandparent support orders (90.3(c)(4)), seasonal-income unequal payments (90.3(c)(5)), and third-party custody (90.3(i)) are not calculated, only disclosed. If any of these apply to your case, treat the estimate as a starting point and confirm the figure with an attorney, a mediator, or Alaska's official worksheet.

Yes. The figure produced by Alaska's Percentage of Obligor's Adjusted Annual Income guideline is presumptive, not mandatory: a court can order a different amount when applying the guideline would be unjust or inappropriate for the specific case, and generally must state its reason on the record. Common grounds include extraordinary medical or educational expenses, a child's special needs, or costs the formula does not capture. Alaska's guideline is set out in Alaska Civil Rule 90.3 — Child Support Awards (current as of 2023-10-16).

You have to file for a modification -- a change in your circumstances does not change what you owe on its own. Alaska, like most states, requires a substantial change in circumstances: a significant involuntary income change, a change in the parenting schedule, or a material change in the child's needs. Until a court or the state child support agency issues a new order, the existing amount stays fully enforceable and arrears keep accruing, and a modification is generally not applied retroactively before the date you filed -- so filing promptly matters. In Alaska, modifications are handled through Alaska Child Support Services Division (CSSD).