12- 172 C.M.R. ch. 11, § 10
A monetary redetermination authorized under subsection 10 of Section 1194 of the Employment Security Law may be based on an investigation initiated at the time the initial claim was filed or upon new or additional information discovered during the one-year period for which such redetermination is authorized. If the weekly benefit amount is increased, and the claimant has not been paid his or her maximum benefit amount, supplemental benefit checks will be issued. If the weekly benefit amount is reduced, and the claimant has not been paid his or her redetermined maximum benefit amount, no overpayments will be established for weeks which have already been paid. However, when the maximum total amount of benefits in the redetermination is less than the total amount of benefits which the claimant has been paid in that benefit year, the benefits which were paid in excess of the redetermined maximum total amount of benefits will constitute an overpayment subject to recovery under Section 1051 of the Employment Security Law.
12- 172 C.M.R. ch. 11, § 10