Child support calculators / Massachusetts
Massachusetts child support
calculator
Free guideline estimate under Massachusetts's official child support guidelines (controlling authority: Mass. Child Support Guidelines (Trial Court)). Built for family law attorneys and their staff. No account required, and nothing you enter is stored.
Overnights always total 365, so changing one side updates the other.
Get the line-by-line worksheet free for 14 days, with the guideline edition and citation (Mass. Child Support Guidelines (Trial Court))
- Printable worksheet with the full line-by-line calculation
- Guideline edition and controlling-authority citation on the printout
- Adjustments detail: parenting-time credit, add-on allocation, deductions
- Save calculations to matters, plus spousal support and property division
14-day free trial · credit card required · every feature included · see pricing
Informational estimate for licensed attorneys and their staff — not legal advice, not a guarantee of any court outcome. Verify against your jurisdiction’s official guidelines worksheet before relying on it.
How Massachusetts calculates child support
Massachusetts's child support guidelines are established by Mass. Child Support Guidelines (Trial Court). Massachusetts uses the income shares model, which combines both parents’ incomes and allocates the basic support obligation between them in proportion to each parent’s share of the combined income.
This calculator applies the current guideline edition: 2025 Guidelines, eff. 12/1/2025 (as amended 10/30/2025).
The result is the presumptive guideline amount, the starting point a Massachusetts court uses before considering deviation factors. The full line-by-line worksheet, guideline edition, and statutory citation are available in Aequis with a 14-day free trial (credit card required).
Massachusetts child support FAQ
How is child support calculated in Massachusetts?
Massachusetts sets child support under its official guidelines (Mass. Child Support Guidelines (Trial Court)), which follow the income shares model. The guideline produces a presumptive monthly amount from the parents' incomes, the number of children, and inputs such as parenting time, childcare, and health insurance costs.
Is this the exact amount a Massachusetts court will order?
No. This is an informational estimate of the presumptive guideline amount. Courts can deviate based on statutory factors, and official worksheets may require inputs this calculator does not collect. Always verify against the official guidelines worksheet before relying on any number.
What income counts for child support in Massachusetts?
Guidelines generally start from each parent's gross income from most sources, with their own definitions, exclusions, and deductions. This calculator uses gross monthly income; consult Mass. Child Support Guidelines (Trial Court) for what Massachusetts includes.
Do overnights affect child support in Massachusetts?
Many jurisdictions adjust the obligation for parenting time once overnights pass a threshold, and this calculator applies Massachusetts's guideline treatment of overnights where the guideline provides one. The exact effect depends on Massachusetts's formula and the parents' incomes.
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CaseForward is a self-help document-preparation service, not a law firm, and does not provide legal advice.
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