Reasons for deviation include:
the parent paying support has other minor children and there are insufficient financial resources available;
the parent paying support has extraordinary expenses (travel-related visitation expenses, uninsured medical expenses); and
other unusual circumstances.
The court may deviate from the support obligation based on the support worksheet by address the following issues:
tax exemptions for the children
minimum and maximum levels of payment
custody and visitation order
age of the children
health insurance obligations
attribution of income
prior orders of support
and expenses of subsequent families.
(Massachusetts General Laws - Chapter 208 - Sections: 28)