The core documents almost every institution asks for
Expect to provide the LLC's formation document, called Articles of Organization or a Certificate of Formation depending on the state, stamped or confirmed by the state; the EIN confirmation letter from the IRS, known as the CP 575, or the later 147C letter; and an operating agreement showing members and ownership percentages. Many institutions also ask for a certificate of good standing if the company is more than a few months old.
For every beneficial owner, which under US rules generally means each person owning 25 per cent or more plus one person with significant control, the institution will want identification, usually a passport for non-US persons, a residential address and proof of address, date of birth, and a US taxpayer number if the person has one. The institution will also ask what the business does, where its customers are, how money will come in and go out, and expected monthly volumes.