No, a US TIN is not required to complete Form W-8. However, the shareholder must provide their foreign TIN, if one is available. If a foreign TIN is not available, the shareholder must list their date of birth in order to successfully complete the form. However, to claim certain treaty benefits, you must complete line 5 by submitting an SSN or ITIN, or line 6 by providing a foreign tax identification number. Please refer to IRS Instructions for Form W-8BEN for more information.