Who is require to withhold? • Withholding Agent.The Tax Department is streamlining withholding tax and wage reporting forms and Web File applications. If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042. This form is for general instructions that apply to all corporation tax forms. It includes a variety of topics about how to fill out your form. Several areas have an additional regional or local tax as outlined below. This page provides a graph of the current tax rates in Massachusetts. Please note the terms Offeror, Consultant, Contractor, and Provider are used interchangeably in this RFP. Us with the RFP number and title in the subject line.