Joseph

I'm currently setting up an Adobe Stock Contributor account in which I have been asked to fill in a W-8 BEN form which requires my foreign tax identification number (which I presume is my UK tax code). I'm unsure how to get this as I have not started to earn yet and therefore have no need to do a self-assessment form, I also am not setting up a business as I don't think I need to? And have only got tax codes from previous employment which I believe expire (this was 4 years ago).