The Massachusetts Child Support Guidelines Chart is a document used by courts in the Commonwealth of Massachusetts to calculate the amount of child support owed by one parent to the other. The Chart is based on the income of the parents and the number of children in the family, and is updated each year to reflect changes in the cost of living. The Chart is used to determine the amount of child support each parent must pay, as well as the amount of child care expenses to be shared. There are two versions of the Massachusetts Child Support Guidelines Chart: one for married parents and one for unmarried parents. The married parents Chart is used when both parents are married, while the unmarried parents Chart is used when one or both parents are unmarried.