The Tax Department is streamlining withholding tax and wage reporting forms and Web File applications. To ask your employer to withhold an additional amount each pay period, complete lines 3, 4, and 5 on Form IT-2104, as applicable.Give Form W8 BEN to the withholding agent or payer if you are a foreign person and you are the beneficial owner of an amount subject to withholding. These instructions provide guidance to QDDs regarding the proper withholding agent status code to use when filing Form 1042 (and Form 1042-S). From I see so far, it looks like I have to file form 1042 (or 1042-S?) instead of 1099. The IT2104 form is an essential document for New York employers when it comes to payroll administration. Could you confirm whether the question is regarding withholding taxes in the US for contractors based outside US? Anonymous's headshot. If you hire a U.S. citizen as an employee he or she will complete a Form W-4 for federal income tax withholding. Independent contractors fill out Form W-9.