Mass. Gen. Laws ch. 175M, § 2
(a)
(c)
(2)
(h)
(2) An employer may require that payment made pursuant to this chapter be made concurrently or otherwise coordinated with payment made or leave allowed under the terms of disability or family care leave under a collective bargaining agreement or employer policy such that the employee will receive the greater of the various benefits that are available for the covered reason. Any leave provided under a collective bargaining agreement or employer policy that is used by the employee for a covered reason and paid at the same or higher rate than leave available under this chapter shall count against the allotment of leave available under this chapter. The employer shall give employees written notice of this requirement.