Estimate Massachusetts child support using the Income Shares Model. Free, private, and updated for 2026.
Legal Disclaimer
These calculators provide estimates for educational purposes only. Child support and family law calculations vary significantly by state, judge, and individual circumstances. Results are not legal advice and do not create an attorney-client relationship. Consult a licensed family law attorney in Massachusetts for advice specific to your situation.
Massachusetts uses the Income Shares Model to determine child support obligations. Massachusetts uses the Income Shares model with its own Child Support Guidelines (revised 2021). Support is based on both parents' gross income (up to a combined income cap of $400,000/year for guideline purposes). Massachusetts courts have discretion above the cap. Support ends at age 18 or 21 if still living at home and financially dependent.
Massachusetts extends support to age 21 in many circumstances when the child lives at home and is financially dependent. The extended support obligation is a unique feature of Massachusetts law. Above the $400,000 combined income cap, courts use discretion.
Massachusetts provides an online Child Support Guidelines Calculator through the Massachusetts Court System website (mass.gov/courts).
Alex earns $5,500/month gross income. Jordan earns $3,200/month. They have 2 children in Massachusetts. Alex has primary custody; Jordan has standard visitation (every other weekend, approximately 73 overnights/year).
This example uses approximate calculations. Actual Massachusetts child support requires the official Income Shares Model worksheet or software and should be verified with a licensed family law attorney or the court.
Both Parents' Income
Massachusetts's Income Shares Model combines both parents' incomes to determine the total family resources available for the children. A higher combined income results in higher support — reflecting the idea that children should benefit from the family's overall financial resources regardless of which parent they primarily reside with.
Custody and Parenting Time
Massachusetts adjusts child support based on the amount of parenting time each parent has. More overnight time with the paying parent generally reduces the support obligation — reflecting that the paying parent directly absorbs the children's costs during their parenting time. Massachusetts extends support to age 21 in many circumstances when the child lives at home and is financially dependent.
Health Insurance and Childcare
Health insurance premiums for the children and work-related childcare costs are added to the basic child support obligation in Massachusetts. The cost is typically split proportionally based on each parent's share of combined income. These add-ons can significantly increase the total support obligation, particularly in cases with high childcare or health insurance costs.
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Massachusetts uses the Income Shares Model to calculate child support. Massachusetts uses the Income Shares model with its own Child Support Guidelines (revised 2021). The guideline amount is the starting point, but courts may deviate based on special circumstances such as a child's extraordinary medical needs, travel costs for visitation, or significantly different financial situations from the guideline assumptions. Always confirm your specific calculation with a Massachusetts family law attorney.
Massachusetts uses both parents' gross monthly income as the starting point for child support calculations, combining them into a total family income figure. Courts may also impute income to a parent who is voluntarily underemployed or unemployed without good cause — meaning they may be held to what they could earn rather than what they actually earn.
No. In Massachusetts, shared custody reduces but does not eliminate child support in most cases. When both parents share custody equally, Massachusetts typically uses an offset method where each parent's guideline support is calculated and the higher earner pays the difference. The goal is to ensure the children maintain a similar standard of living in both households. If incomes are nearly equal, the resulting payment may be very small, but it rarely drops to zero unless incomes are identical.
In Massachusetts, child support generally continues until the child reaches the age of majority (potentially age 21 in Massachusetts), graduates from high school, or is otherwise emancipated — whichever occurs later up to the state maximum. Courts may also continue support for adult disabled children who cannot support themselves. Support does not automatically end — the paying parent must file for termination when the child ages out or becomes emancipated.
Yes. Massachusetts child support can be modified when there is a substantial change in circumstances. Most states, including Massachusetts, require that the new calculated amount differ from the existing order by at least 15% — or that three years have passed since the order was entered, triggering an automatic review. Changes that typically qualify include significant income changes for either parent, a change in custody arrangement, a child's new medical needs, or loss of health insurance coverage. Modifications require filing a motion with the family court — the original order remains in effect until a new order is entered.