Learn the Department of Revenue's (DOR's) registration requirements when working as an outofstate contractor or subcontractor in Massachusetts. In general, you aren't obliged to withhold taxes from independent contractors.However, you may still need to report taxes. You need FormW8BEN, which is a Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting. Who is require to withhold? • Withholding Agent. 4. assachusetts State tax withholding allowance form used to adjust state tax withholding on salary or wages. Companies with Employees or Independent Contractors in Massachusetts Subject to New Tax on July 1. If you are a new employee, you need to fill out the IRS W-4 Form when you are hired so that MIT can withhold the correct federal income tax from your pay. Who is require to withhold?