Form 1001 or similar statement should be filed with an employer prior to commencing employment in order to avoid the withholding of taxes. Forms in the W8 series are used to certify for eign status for withholding purposes. Forms.Our IR335 Employer's guide explains your obligations if you need to withhold tax from a payment made to a nonresident contractor. To accurately determine the correct amount of Massachusetts withholding, employers will rely on Massachusetts Form M4. If you are hiring a foreign contractor, you will need to have them complete IRS Form W8BEN. State or local tax withholding forms must also be filled out in the same manner as the Form W-4. The state of Maryland imposes an additional county tax. The MTC proposal sets a 20work day threshold for nonresident employee withholding and filing requirements. A Massachusetts resident is taxed on foreign earned income even if such income is earned during a temporary or protracted absence from Massachusetts. These 2letter codes are used to identify countries.