The Massachusetts Child Support Charts are a set of legal guidelines used to determine the amount of financial support that a non-custodial parent must provide for their children. The Massachusetts Child Support Charts are based on the income of the non-custodial parent, the number of children, and the amount of time the non-custodial parent spends with the children. There are two types of Massachusetts Child Support Charts: the Basic Child Support Chart and the Modified Child Support Chart. The Basic Child Support Chart is used when both parents share custody of the children, while the Modified Child Support Chart is used when one parent has primary custody of the children.