Alaska sets child support under Civil Rule 90.3, applying a percentage-of-income approach to each parent’s adjusted annual income up to a $138,000 cap. The rule uses one formula when one parent has primary physical custody and a different formula for shared custody arrangements, and it sets a $50/month floor for orders that would otherwise fall below that. This calculator’s output has been checked against the worked examples in the court system’s own DR-310 form.
Key facts
| Model | Percentage of adjusted income — Alaska Civil Rule 90.3 |
|---|---|
| Adjusted-income cap | $138,000/year |
| Minimum order | $50/month |
| Custody formulas | Separate primary-custody and shared-custody calculations |
Official source: https://webapp.state.ak.us/cssd/guidelinecalc/login
Custody arrangements covered
- Primary custody — one formula applies
- Shared custody — a separate Civil Rule 90.3 formula applies
Frequently asked questions
What rule governs child support in Alaska?
Alaska Civil Rule 90.3, which uses a percentage of each parent’s adjusted annual income, capped at $138,000, to set the presumptive support amount.
Does Alaska have a minimum child support order?
Yes — Civil Rule 90.3 sets a $50/month floor.
Does shared custody change the Alaska formula?
Yes. Alaska runs a different calculation for shared physical custody than it does for primary custody with one parent, rather than adjusting a single formula with a credit.
Is this an official Alaska calculation?
No — it’s an independent estimate checked against the Alaska court system’s own DR-310 worked examples, not a substitute for the court’s calculation or for advice from a family law attorney.
Update history
- — Shared-custody percentages entered for the two parents are now required to add up to 100%, preventing an invalid split from silently passing through the calculation.
- — Alaska went live under Civil Rule 90.3, with the primary and shared-custody formulas, a $138,000 adjusted-income cap, and a $50/month minimum order. Verified against the court system's DR-310 worked examples.