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 kind of account do I need to open for my independent consultant business (e.g. Mary Kay, Pampered Chef)? What kind of identification do I need to open a new account?