Calculate Now →

Child Support in Massachusetts

Free calculator, modification rules, arrears interest, and 50/50 custody guide for Massachusetts — 2026.

📊
Child Support Calculator
Estimate payments using Massachusetts's Income Shares
📝
Modification Checker
Does your income change qualify?
💰
Arrears Calculator
Past-due support with 12% interest
⚖️
50/50 Custody Guide
Does equal custody eliminate support?

Massachusetts Child Support Facts — 2026

Formula modelIncome Shares
Income basisBoth parents' income
Support ends at age18
Modification threshold20% income change
Arrears interest rate12% per year
Official agencyMassachusetts Child Support Agency ↗
Massachusetts uses Income Shares. Courts have discretion to order support through college.

Other States

AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming