The IRS has issued guidance in Notice 2017-46 (the “Notice”) relaxing the rules applicable to U.S. financial institutions that require the collection of foreign taxpayer identification numbers (Foreign TINs) from U.S. nonresident aliens. Under anticipated amendments to temporary regulations that are described in the Notice, withholding agents will be required to collect a Foreign TIN and date of birth (in the case of an individual account holder) on a foreign person’s beneficial owner withholding certificate (e.g., a…