Single Member LLC SSN vs EIN… When to use which

I just started a single-member LLC and have yet to receive the TR-570 form, but will be remaining a disregarded entity. I do have an EIN for the business that I attached to the LLC when I registered with NYSDOS. I understand that for my W-9, it will have my SSN/Name.



My Questions:



If I want to open a business bank account, does that need to have my SSN as well? Or the LLC's EIN?

Do I need to formally attach my SSN to the LLC through the NYSDOS through some form so they know it's being used with the LLC, or is this accomplished by the W-9/tax return?





Thanks



Ryan