i just wanted to ask does anyone really submit their tax number or social security number in their application ? I actually have 4 China bank account , this year I had a new passport , so went to the 4 bank to update it . Out of the 4 banks i went to , only one , Construction Bank of China insist on having my Tax return number ( I am not an American so we don't have a social security number , furthermore i retired almost 15 years ago and their is no tax return number for me ). In the end I refused and they still updated my account with my new passport and only this bank asked for my home address and again none of the other 3 asked .