Example. Say the other parent makes $100/week before taxes, and he pays $25/week in support for another child. Subtract $25 from $100, and you get $75. Write $75 on the line for the father's weekly income when you use the Child Support Guidelines Worksheet to figure out how much support he must pay for your child.Massachusetts has  Child Support Guidelines  that judges must use to figure out how much child support the parent without custody has to pay each week.he court will look at the Child Support Guidelines Worksheet to decide how much support the other parent will pay. In some rare cases, the court might order a different amount. Usually, the court will order the other parent to pay at least $80.00/month.