Hawaii Child Support Calculator (2026)
Hawaii calculates child support under guideline-formula guidelines (Haw. Rev. Stat. §§ 571-52.5, 576D-7(c), 576E-15, 580-47(a); 2024 Hawai'i Child Support Guidelines). Estimate the guideline amount below.
Hawaii's guideline formula needs more than a dozen inputs (tax filing status, timeshare percentage, deductions) — a two-field shortcut would mislead you. The state's official calculator implements the full formula:
Open the official Hawaii calculator →Your Case Details
Answer a few questions to see your estimated range.
Approximate gap between higher-earner and lower-earner.
Estimated Monthly Support
$840 — $1,560
State formulas vary significantly. This estimate uses national averages — your state's guidelines may produce a different number.
Editorially Reviewed — Content reviewed for accuracy using published legal research, government data, and verified court records. See our methodology
Reviewed by Leonard Goldberg, Editor · Last updated
Hawaii calculates child support with the multi-step Melson formula rather than a simple lookup table (Haw. Rev. Stat. §§ 571-52.5, 576D-7(c), 576E-15, 580-47(a); 2024 Hawai'i Child Support Guidelines): each parent first keeps a self-support allowance, the children's primary needs are covered next, and a standard-of-living percentage applies to remaining income. Use the official calculator or worksheet linked above for your figure; this page explains each step.
How Hawaii Calculates Child Support
Hawaii is one of only three states (with Delaware and Montana) using a modified Melson formula rather than an income-shares table or a flat percentage-of-income model. The Child Support Guidelines Worksheet (Appendix A-1 of the 2024 Hawai'i Child Support Guidelines, effective April 1, 2024, reviewed at least once every four years under HRS §576D-7(c)) first converts each parent's monthly gross income to Net Income via the official 'Table of Incomes' (deducting state/federal taxes, FICA, and a $1,693 Self-Support Reserve), then computes a 'Primary Child Support Need' (number of children × $455 poverty-based base amount, plus actual child care and health insurance costs), and finally adds a Standard of Living Adjustment (SOLA) — 10% per child up to a 30% cap for 3+ children — applied to the parents' combined income remaining above that need. There is no printed obligation-by-income table; every case runs through this formula on the CSG Worksheet or the Judiciary's automated Excel version.
Statutory basis: Haw. Rev. Stat. §§ 571-52.5, 576D-7(c), 576E-15, 580-47(a); 2024 Hawai'i Child Support Guidelines. Exact figure: official Hawaii calculator.
Worked Example
Illustrative example, 2 children, sole physical custody with Parent B (Parent A has 143 or fewer overnights/year): Parent A's monthly gross income is $5,000 and Parent B's is $3,000. Using the Table of Incomes, assume Net Income of roughly $3,500 for Parent A and $2,300 for Parent B (combined $5,800) — Parent A carries 60% of the obligation. Primary Child Support Need = (2 children × $455 base) + $300 child care + $150 health insurance = $1,360. SOLA Income = gross income minus the $1,303 self-support threshold for each parent: $3,697 (A) + $1,697 (B) = $5,394 combined; remaining SOLA income after the Primary Need = $4,034; SOLA percentage for 2 children = 20% → SOLA amount ≈ $807. Total Child Support Calculation = $1,360 + $807 = $2,167. Parent A's Total Support Obligation = 60% ≈ $1,300/month owed to Parent B. (Net Income figures are illustrative; Hawai'i's official Table of Incomes/automated worksheet gives the exact number.)
When Courts Deviate From the Guideline
- Presumptive child support would exceed 70% of the obligor's net income (per the Table of Incomes)
- The payor is also legally supporting other, non-subject children
- Extraordinary needs of a child or a parent, e.g., special educational or housing needs for a disabled child
- The child attends private school, creating Private Education Expenses (PEX) — tuition, books, and required fees
- A parent has zero net income due to disability, incapacitation, incarceration, or involuntary unemployment
- The parents agree by stipulation to a higher or lower amount, subject to Court/CSEA/OCSH review
Frequently Asked Questions
Is there a cap on child support for high-income parents in Hawaii?
There's no flat statutory dollar cap. Hawai'i's Melson-formula worksheet keeps scaling with income — the Judiciary's automated version runs on combined monthly gross income up to $999,999 — but a 'Maximum Child Support' rule (2024 CSG §V.K) prevents any parent's total obligation from exceeding their own monthly Net Income, so support can never mathematically exceed what a parent nets after taxes and the self-support reserve.
What counts as income under Hawaii's child support formula?
Gross income is defined broadly (2024 CSG §V.J.1): wages, tips, bonuses, overtime, self-employment and business income, rental income (net of expenses), investment income, pensions, trusts, annuities, most Social Security benefits (except SSI), VA benefits, military BAH/BAS/COLA and drill pay, unemployment and workers' comp, and even monetary gifts, lottery, and gambling winnings. Excluded: TANF, SSI, SNAP, Section 8 allowances, general assistance, Pell Grants, WIC, and adoption assistance payments.
How does shared or joint custody change the Hawaii child support amount?
Hawai'i calculates purely by annual overnights, not the custody label. A parent with 143 or fewer overnights gets no time-sharing credit; 144–182 overnights triggers the Extensive Time-Sharing Worksheet, crediting the paying parent for every overnight above 143; and about 183 overnights is treated as Equal Time-Sharing — the worksheet runs for both parents and whichever owes more pays the other the yearly difference divided by 12.
Until what age does child support run in Hawaii, and is there a college provision?
Support runs to the age of majority by default, but Hawai'i's Family Court can establish support for an unmarried adult child through about age 23 while the child is continuously enrolled full-time in an accredited college, university, or vocational program (2024 CSG §III.A.2), and support can continue indefinitely for an incompetent or disabled adult child.