Forming your Arizona LLC is step one. Funding it properly is step two. But before any money can flow in or out of the LLC, you need a dedicated business bank account — and banks have specific requirements you must satisfy before they will open one.

This article answers every question a member or manager is likely to have about opening an LLC bank account in Arizona. Read all the way through, then gather your documents before you walk into the bank. The process is straightforward if you are prepared and frustrating if you are not.

The LLC Bank Account Document Checklist

  1. Arizona Articles of Organization — or a certified copy from the Arizona Corporation Commission
  2. Employer Identification Number (EIN) — the IRS confirmation letter (CP 575) or Form SS-4 approval
  3. LLC Operating Agreement — signed by all members
  4. Bank Resolution — authorizing the signer(s) to open and manage the account
  5. Government-issued photo ID — for every person who will be an authorized signer
  6. Beneficial ownership information — name, date of birth, address, and ID for any owner with 25%+ interest and the person with primary management control
  7. Opening deposit — amount varies by bank; confirm in advance

Frequently Asked Questions

Why does my Arizona LLC need its own bank account?

Every Arizona LLC should have a dedicated business bank account because it is the single most important operational step you can take to protect the personal liability shield the LLC provides.

Commingling personal and business money destroys the legal separation between you and the LLC. If a creditor sues your LLC and a court finds that you routinely mixed funds, it can "pierce the corporate veil" and hold you personally liable for the LLC's debts — defeating the entire purpose of forming the LLC in the first place.

A separate account also makes bookkeeping, tax preparation, and profit distribution far simpler, and gives you a clean paper trail if you are ever audited.

Who can open a bank account on behalf of an Arizona LLC?

The person who opens the account must be authorized to act on the LLC's behalf under the operating agreement or a formal resolution.

For a member-managed LLC, any member who is authorized in the operating agreement may open the account. For a manager-managed LLC, the manager (or a member who has been specifically authorized by the manager) does so. Most banks will ask to see written proof of that authority in the form of a signed resolution or a clear authorization provision in the operating agreement.

What documents does a bank require to open an LLC bank account?

Requirements vary slightly from bank to bank, but the standard package is:

  • Arizona Articles of Organization (or a certified copy)
  • The LLC's EIN from the IRS
  • A signed LLC Operating Agreement
  • A bank resolution authorizing the account opener
  • Government-issued photo ID for each signer
  • Beneficial ownership information (see below)

Some banks also request an assumed name (DBA) certificate if the LLC transacts business under a trade name different from its legal name.

What is an EIN and does my LLC need one to open a bank account?

An Employer Identification Number (EIN) is a nine-digit federal tax identification number the IRS assigns to businesses. Think of it as your LLC's Social Security Number for tax and banking purposes.

Without an EIN, virtually no bank will open a business checking account for your LLC. The good news is that the IRS issues EINs for free and you can apply online at irs.gov in about five minutes. You receive the EIN immediately upon completing the online application. Print or save the confirmation — the bank will want to see it.

What is a bank resolution and do I need one?

A bank resolution is a written document — signed by the LLC's members or manager — that formally authorizes a specific person (or persons) to open and manage bank accounts on behalf of the LLC. It identifies the LLC by its legal name, names the authorized signers, and specifies what banking actions they may take.

Most banks require a resolution before they will open an account. Many banks have their own printed resolution form they ask you to execute at the branch. Your LLC can also use a custom resolution prepared by your attorney. KEYTLaw prepares a bank resolution for every LLC we form, so our clients arrive at the bank ready to go.

Will the bank want to see the LLC's operating agreement?

Yes. Most banks review the operating agreement to confirm who is authorized to act for the LLC, how the LLC is managed, and that the entity is legitimate.

If your LLC does not have a written, signed operating agreement, you will likely be turned away. Arizona law allows LLCs to operate without a written agreement, but no serious bank or business partner will work with an LLC that lacks one. An operating agreement is not optional — it is essential.

What personal identification does the bank require from the account signer?

Under federal Bank Secrecy Act and anti-money-laundering regulations, every bank must verify the identity of the individuals who own and control the LLC. The account opener must present a valid, unexpired government-issued photo ID — a driver's license or passport is standard. The bank will also collect the signer's Social Security Number (or ITIN), date of birth, and current residential address.

Do I need to deposit money to open the account?

Most banks require a minimum opening deposit, which can range from $0 to $100 or more depending on the account type and institution. Some business checking accounts at credit unions or online banks have no minimum deposit requirement.

Ask about the minimum deposit, monthly maintenance fees, and transaction limits before choosing a bank. Critically, any initial deposit should come from the LLC's funds — for example, from the capital contributions the members made when the LLC was formed — not from your personal account. Using personal funds to fund the new business account defeats the separation you are trying to establish.

Can a single-member LLC open a business bank account?

Yes, and it absolutely should. A single-member LLC can and must open a separate business bank account to preserve its liability protection. Being the sole member does not reduce the need for separation — if anything, it makes it more important. The IRS and creditors are more likely to scrutinize single-member LLCs for commingling, so a clean dedicated account is essential.

Bring the same documents: Articles of Organization, EIN, signed operating agreement, bank resolution, and your photo ID.

⚠️ Warning: Using a personal bank account for LLC business is one of the most damaging mistakes an LLC owner can make. It destroys the liability protection the LLC is designed to provide, creates a tax nightmare, and makes your LLC nearly impossible to audit or value. The fix is simple — open an LLC account and keep all business money completely separate from your personal finances.

Which banks are best for small Arizona LLCs?

There is no single best bank for every LLC. Here is a quick comparison of your main options:

  • Local Arizona community banks and credit unions — frequently lower fees, personal service, and relationship lending if you ever need a business loan.
  • Online business banks (Relay, Mercury, Bluevine) — few or no fees, no branch visits required, and strong integrations with accounting software like QuickBooks and Xero. Well-suited for LLCs that do most business online.

Compare monthly fees, minimum balance requirements, transaction limits, and accounting software integration before deciding.

How long does it take to open an LLC bank account?

If you have all required documents assembled in advance, opening an account at a physical bank branch typically takes 30 to 60 minutes. Online business banks can approve and open accounts in as little as 10 minutes with no in-person visit required.

The most common cause of delays is a missing document — especially the EIN or a signed operating agreement. Gather everything on the checklist above before you go.

Can a foreign national who is a member or manager of an Arizona LLC open a bank account?

Yes, but the process involves additional steps. A foreign national without a U.S. Social Security Number must obtain an Individual Taxpayer Identification Number (ITIN) from the IRS. The LLC itself needs an EIN, which a foreign national can obtain by calling the IRS Business & Specialty Tax Line or by faxing Form SS-4.

Not every bank is comfortable working with foreign nationals. Some require an in-person visit with a passport and additional documentation. It often helps to work with a bank experienced in serving international clients, and to consult with an attorney who has formed LLCs for foreign nationals before you begin the banking process.

Need Help Forming Your Arizona LLC?

KEYTLaw has formed over 10,000 Arizona LLCs. We prepare your Articles of Organization, operating agreement, bank resolution, and EIN application — everything you need to walk into any bank ready to open your account.

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About the Author: Richard Keyt, Arizona LLC Attorney
Richard Keyt has practiced Arizona law since 1979 and has formed more than 10,000 Arizona LLCs. He is a founding member of KEYTLaw, LLC, where he works alongside his son and law partner Richard C. Keyt, a licensed attorney and CPA. Richard is one of Arizona's most experienced LLC formation attorneys. Read Richard's full biography.