Hawaii uses the Melson Formula — a three-tier calculation. This tool provides an estimate only. Updated for 2026 — covers 50/50 custody, arrears, modifications and Hawaii child support laws.
MelsonFormula
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18Age Support Ends
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🌺 Hawaii Melson Formula Model
Hawaii Child Support Calculator 2026
Hawaii uses the Melson Formula — a three-tier calculation. This tool provides an estimate only.
⚠Hawaii uses the Melson Formula — one of the most complex child support models in the US. This calculator provides an estimate only. For exact figures, consult a Hawaii family law attorney.
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$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official Hawaii melson formula. Courts may deviate based on special circumstances. Consult a Hawaii family law attorney for your specific situation. The Melson Formula requires professional calculation.
🌺 How Hawaii Calculates Child Support
ModelMelson Formula — three-tier calculation
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest10% annual interest on unpaid arrears
Hawaii Key RuleHawaii uses the Melson Formula — a modified version of the Income Shares model
Additional InfoHawaii courts may order post-secondary educational support beyond age 18
⚖ 50/50 Custody in Hawaii
Does Child Support Apply With 50/50 Custody in Hawaii?
In most cases, yes. Hawaii does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
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$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a Hawaii family law attorney for exact figures.
📋 Hawaii Arrears Calculator
Hawaii Child Support Arrears Calculator
Calculate total back child support including 10% annual interest Hawaii applies to unpaid arrears.
⚠Hawaii charges 10% annual interest on all unpaid child support arrears.
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$
$
Total Arrears Owed (with 10% Interest)
$0
including Hawaii 10% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* Hawaii applies 10% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
Hawaii Child Support Modification
Estimate your new payment and check if you qualify for a modification in Hawaii.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
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36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
—
Time Since Order
—
* Qualification estimate only. Consult a Hawaii family law attorney before filing.
📜 Updated 2026
Hawaii Child Support Laws 2026
Key rules, age cutoffs and what you need to know in Hawaii.
FORMULA How Hawaii Calculates Child Support
Hawaii Revised Statutes Section 576D-7 governs child support. Hawaii’s Melson Formula considers each parent’s primary support need and child support need before calculating the final obligation.
AGE When Does Child Support End in Hawaii?
Child support in Hawaii ends when the child turns 18 — Courts may order support beyond 18 for college. Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in Hawaii
Hawaii charges 10% annual interest on unpaid child support arrears. Hawaii’s rate of 10% is among the higher rates in the country. There is generally no statute of limitations on child support debt.
ENFORCEMENT Hawaii Child Support Enforcement
Hawaii has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in Hawaii
Child support can be modified in Hawaii when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 Hawaii Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
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Days Until Due
—
Payments Remaining
—
Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a Hawaii Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.