Your Social Security Number (SSN) is a 9-digit number used for identification and tax purposes. You can usually find it on your Social Security card, on tax documents like a W-2 or 1040, or on a pay stub or government form. Related ArticlesHow can I verify my address?How can I protect myself from fraud and scams?How do I open a MAJORITY account?Why does MAJORITY ask for my SSN or ITIN when I register?Can I add my SSN after registering with MAJORITY?