Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 152, § 50

Whenever payments of any kind are not made within sixty days of being claimed by an employee, dependent or other party, and an order or decision requires that such payments be made, interest at the rate of ten percent per annum of all sums due from the date of the receipt of the notice of the claim by the department to the date of payment shall be required by such order or decision.  Whenever such sums include weekly payments, interest shall be computed on each unpaid weekly payment.