What documentation do I need to open accounts for a Sole Proprietorship? Two forms of identification for each signer on the account Certificate of assumed business name Assignment of Tax ID/EIN or 1st two pages of recent tax return Have more questions? Submit a request 0 Comments Article is closed for comments. Related articles What documentation do I need to open accounts for a Partnership? What are your current loan rates? Why is my 3Rivers debit or credit card being declined? How do I wire money to a 3Rivers member? What kind of account do I need to open for my independent consultant business (e.g. Mary Kay, Pampered Chef)?