Can i use my personal Tax ID number to build credit? As far as i know, i can open bank account apply for secure credit cards, credit cards and get phone services. But every time that i try to get information about my credit score i can't browse it cause the information that i enter is not valid for the websites such as experidian, equifax, etc. Sometimes i apply for credit cards and when they ask for my SSN i entered my tax id number and it went thru. Do i actually will appear in their database in the future or i can only have certain kind of credit?