Hawaii Child Support — Calculator, Laws & Guide (2026)

Understanding Hawaii child support laws helps both custodial and non-custodial parents know their rights and obligations. This comprehensive Hawaii child support guide covers how payments are calculated, what income counts, when support can be modified, and how orders are enforced. Whether you are going through a divorce, seeking a modification, or dealing with non-payment, this guide explains Hawaii’s child support system in plain language.

Verified against Hawaii statutes and federal OCSE guidelines as of April 2026.

Hawaii Child Support Overview

Hawaii uses the income shares model for calculating child support. This model is based on the principle that children should receive the same proportion of parental income they would have received if the family were intact. Both parents’ incomes are combined, and the support obligation is divided proportionally.

Hawaii uses the Income Shares model under HRS §576D-7. Both parents’ gross monthly incomes are determined and converted to net income by subtracting federal/state taxes, Social Security (7.65% up to FICA wage base), and Medicare (1.45%). Combined net income is matched to the child support schedule based on number of children. Each parent’s share is proportional to their percentage of combined income. Health insurance and childcare costs are added to the basic obligation. Minimum support is 83 per child per month.

How Hawaii Calculates Child Support

The Hawaii child support calculation considers multiple factors:

1. Determine each parent’s gross income — wages, salary, commissions, bonuses, self-employment income, investment income, and other sources.
2. Calculate combined parental income — add both parents’ adjusted gross incomes together.
3. Apply the guideline schedule — Hawaii’s guidelines provide a base support amount based on combined income and number of children.
4. Prorate between parents — each parent’s share is proportional to their percentage of the combined income.
5. Add healthcare and childcare costs — these are added to the base amount and divided proportionally.
6. Apply adjustments — parenting time credits, other child obligations, and special circumstances may adjust the final amount.

Online calculator: Use our child support estimator below to calculate your estimated obligation.

What Counts as Income in Hawaii

Gross income from all sources including wages, salaries, bonuses, commissions, self-employment income (net for self-employed), rental income, investment dividends, Social Security benefits, Veterans Affairs disability compensation, disability insurance payments, military base pay, special pay, and housing allowance. Non-taxable income is also included. Gross income is converted to net by subtracting federal and state income taxes (filing single, one exemption), Social Security tax, and Medicare tax.

Imputed income: YES. Courts may impute income to voluntarily unemployed or underemployed parents based on earning capacity considering employment history, education, health, age, and local job market. For custodial parents with school-age children who are mentally and physically able to work but remain at home, up to 30 hours of weekly earnings at minimum wage may be imputed. No income is imputed to a parent caring for a child aged 3 or younger.

Deviation factors: Exceptional circumstances required (case-by-case, burden on requesting party). Factors include: child support exceeds 70% of obligor’s net income; obligor pays support for other children by court order; child has extraordinary needs (special educational or medical); obligor has limited earning ability; calculated support exceeds reasonable financial needs of child; extraordinary medical or educational expenses; inter-island or mainland travel costs for visitation; child’s independent income; tax consequences; shared/joint custody arrangements; high cost of living in Hawaii; military deployment or unique military circumstances.

Healthcare & Childcare in Hawaii Child Support

Health insurance: The monthly cost of health insurance coverage for the child is added to the basic child support obligation in the worksheet calculation. The parent who pays the premium receives a credit. Where private health insurance is not available, not reasonable in cost, or not accessible to the children, the court may order cash medical support payments of 10% of the obligated parent’s net income.

Childcare costs: Monthly childcare expenses required to allow the custodial parent to work or attend vocational training are added to the basic child support obligation in the guidelines worksheet. The cost is shared proportionally between parents based on their respective share of combined income.

When Does Hawaii Child Support End?

In Hawaii, child support generally ends when the child reaches Child support ends at age 18 unless the child is still attending high school. Support continues past 18 if the child is enrolled as a full-time student (12+ credit hours per semester) at an accredited post-secondary university, college, or vocational school — until graduation or age 23, whichever occurs first. CSEA sends notice 3 months before the child’s 19th birthday requiring proof of enrollment; if proof is not provided, support is automatically suspended at age 19.. However, support may continue or end earlier based on:

• The child graduates from high school (if still a minor)
• The child becomes emancipated (marriage, military service, self-supporting)
• The child has special needs requiring ongoing support
• College support: YES. Hawaii requires continued child support (not a separate college contribution) until age 23 if the adult child is enrolled full-time (12+ credit hours) at a post-high school university, college, or vocational school. Custodial parent or adult child must provide regular verification of continued enrollment. If the child stops attending full-time or takes a break, support is suspended.

Modifying Hawaii Child Support

When to modify: A material change of circumstances is presumed if recalculated support is 10% or more higher or lower than the existing support order. Additionally, either parent may petition for review and adjustment once every 3 years without showing any change in circumstances. More frequent petitions require proof of substantial or material change (e.g., significant income change, change in custody, change in number of eligible children).

How to modify: Either parent may request modification through the Child Support Enforcement Agency (CSEA) administrative process or by filing a motion with the Family Court. The CSEA can administratively modify orders through the Office of Child Support Hearings (OCSH). The 3-year review right applies to both administrative and judicial processes. Modifications are retroactive only to the date of the request, not the date the change occurred.

Either parent can request a modification. Changes are typically not retroactive to before the date of filing the modification request.

Hawaii Child Support Enforcement

Hawaii has multiple tools to enforce child support orders when a parent fails to pay:

• Income withholding/wage garnishment (from first dollar
• automatic via KEIKI system); state and federal income tax refund intercept; driver’s license suspension; professional/occupational license suspension; passport denial (arrears over 2500); attachment of financial accounts/bank levies; property liens; credit bureau reporting; contempt of court proceedings. License suspension triggered automatically on quarterly basis for NCPs delinquent 3+ months. Most enforcement is auto-initiated by the KEIKI automated system.

Contact Child Support Enforcement Agency (CSEA), Department of the Attorney General, State of Hawaii at https://ag.hawaii.gov/csea/ for enforcement assistance.

Additional Hawaii rules: Hawaii explicitly recognizes high cost of living in Hawaii as a deviation factor. Military housing allowance (BAH) is counted as income. Inter-island and mainland travel costs for visitation are recognized exceptional circumstances. The automated KEIKI system initiates most enforcement actions without custodial parent request. Self-employed income uses net (not gross) on a separate worksheet (Appendix A-4). Guidelines are reviewed and updated at least every 4 years (most recent: 2024 effective April 1, 2024). Joint/equal custody timesharing has its own calculation methodology within the guidelines.

Official Sources & Resources

• Child Support Enforcement Agency (CSEA), Department of the Attorney General, State of Hawaii: https://ag.hawaii.gov/csea/
• Federal OCSE: acf.hhs.gov/css
• Cornell LII — Child Support: law.cornell.edu
• Hawaii Guidelines Statute: HRS §576D-7 (Guidelines in establishing amount of child support); HRS Chapter 576D (Child Support Enforcement); HRS Chapter 576E (Administrative Process for Child Support Enforcement); HRS §576E-14 (Modification, suspension, or termination of orders)

Last verified April 2026. Contact us if you notice outdated information.

Estimate Your Child Support

Use our free child support estimator to calculate estimated monthly payments. Enter both parents’ incomes, number of children, and custody arrangement to see a personalized breakdown based on your state’s formula.

Related Guides

• Hawaii Divorce Process Guide
• Hawaii Child Custody Guide
• Hawaii Alimony Guide
• All Child Support Guides