Quarterly reports made by mail shall be deemed to have been made timely if postmarked not later than midnight of the due date. If the due date falls on a Saturday, Sunday or a legal holiday, the report shall be deemed to have been made timely if postmarked not later than midnight of the next business day.
Employers, payroll service providers and group account agents are required to file reports electronically as directed by the Bureau unless they obtain a waiver from the Bureau. Waivers shall only be issued upon a determination that it is not possible for the reporting employer, payroll service provider, or group account agent to file reports electronically.
12- 172 C.M.R. ch. 2, § 7