You must use these forms when you prepare your US federal and state income tax return. For more information, see Tax Filing section.Massachusetts State tax withholding allowance form used to adjust state tax withholding on salary or wages. 2.1 explains the requirements of employers and other persons to withhold the Massachusetts income tax on wages and payments. While MIT is exempt from many taxes in the US, that is not necessarily the case if the funding, collaborator, or activity is not in the US. 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. You need FormW8BEN, which is a Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting. Withholding agent doesn't know the tax residency. In general, if a withholding agent cannot reliably associate a payment with valid documentation (e.g. Form. If you do not live or physically work in MA, you are not subject to MA tax and your employer should not be withholding MA tax.