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Free Massachusetts child support calculator. Calculate child support obligations based on Massachusetts state guidelines, custody arrangements, and combined income. Our calculator uses Massachusetts Child Support Guidelines income shares model to determine accurate child support estimates with parenting time adjustments and additional expense calculations.
Last updated: February 2, 2026
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Parent 2: 65% custody time
Monthly Child Support
$2,214
per month
Based on Massachusetts child support guidelines with 2 children. Combined monthly income of $10,500 results in a basic obligation of $3,045. Custody adjustment applied for 35% parenting time.
Legal Disclaimer: This calculator provides estimates based on Massachusetts child support guidelines. Actual court orders may vary based on additional factors and judicial discretion. Consult a Massachusetts family law attorney for official calculations.
Calculation Method
Combined Income
Both parents' incomes combined
Threshold
30% or more
Substantial parenting time credit
Ranges
20% - 42%
Varies by income level
Included
Insurance + Care
Added to basic obligation
Division
Fair Share
Based on earning capacity
Standard
MA Guidelines
Court-recognized calculations
Parents earning $6,000 and $4,500/month with 2 children (35% custody Parent 1)
Monthly Child Support
$2,214
Based on Massachusetts guidelines with parenting time adjustment
Massachusetts child support is a court-guideline estimate of how much financial support should be paid for a child after separation or divorce. The underlying idea is that children should continue receiving a fair share of both parents' income. This calculator helps parents, mediators, and attorneys quickly model support outcomes using income, custody percentage, and key child-related expenses.
1) Combined Income
Combined Income = Parent 1 Income + Parent 2 Income2) Basic Obligation (Tiered by Income + Child Count)
Basic Obligation = Combined Income × Guideline Percentage1 child: 20-22% · 2: 27-29% · 3: 32-34% · 4: 36-38% · 5+: 40-42%
3) Proportional Parent Share
Parent Share = Basic Obligation × (Parent Income / Combined Income)4) Custody Adjustment
If Parent 1 custody ≥30%, adjustment reduces support using guideline factors5) Extra Expenses
Add Health Insurance + Childcare proportionally, then subtract custody adjustmentThese quick scenarios use the same logic implemented in this calculator to show how child count and custody affect outcomes.
| Scenario | Combined Income | Children | Parent 1 Custody | Estimated Support |
|---|---|---|---|---|
| Low-income single child | $1,800/mo | 1 | 20% | Lower bracket (~20%) baseline |
| Mid-income two children | $4,800/mo | 2 | 35% | Mid bracket + custody credit |
| High-income shared custody | $11,000/mo | 3 | 50% | High bracket with larger adjustment |
This model scales percentages by income range and child count, then allocates responsibility proportionally by each parent's income. It also accounts for practical parenting costs through custody adjustments and add-on expenses.
Need help with other state child support calculations? Check our Florida calculator, Illinois calculator, and Louisiana calculator.
Get Custom Legal Calculator for Your PlatformKey Insight: Tiered income brackets for fairness
Massachusetts uses different percentage rates based on combined income levels, ensuring fair support obligations across economic circumstances. Higher combined incomes result in slightly higher percentage rates.
Combined ≤ $2,000/month
20% for 1 child, 27% for 2 children
Combined $2,001-$6,000/month
21% for 1 child, 28% for 2 children
Combined >$6,000/month
22% for 1 child, 29% for 2 children
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