Most banks will ask for an EIN, but some will let you open an account with just your Social Security number

Whether a bank requires an Employer Identification Number (EIN) for an LLC business checking account depends on the bank and how your LLC is structured for tax purposes. Many large banks—Chase, Bank of America, Wells Fargo—treat an EIN as standard, though they may accept a Social Security number if your LLC is taxed as a sole proprietorship. Smaller regional banks and online banks often have more flexibility. The real constraint is not the bank's requirement but what the IRS expects: if your LLC has multiple members, you must have an EIN. If it's a single-member LLC taxed as a sole proprietorship, an EIN is optional but recommended.

The practical difference matters because banks use the EIN to report account activity to the IRS under your business name, not your personal name. Without an EIN, the bank may report under your Social Security number, which can create confusion on your business tax return and make it harder to separate personal and business finances in the IRS's records.

Key Takeaways

  • Multi-member LLCs must have an EIN; single-member LLCs can use either an EIN or Social Security number, but an EIN is safer for tax reporting.
  • Large national banks typically require an EIN as a matter of policy, while some online and regional banks will open accounts with a Social Security number.
  • You can obtain an EIN for free from the IRS in minutes online, by phone, or by mail—you do not need a lawyer or paid service.
  • Bring your LLC formation documents (Articles of Organization) and a government-issued ID to the bank, along with whichever tax ID you have.
  • If you open an account without an EIN and later obtain one, you can update the account information with the bank, though this may require a visit in person.

When banks will and will not require an EIN

National banks and most credit unions have written policies that treat an EIN as required for any business account, including single-member LLCs. Chase, for example, lists an EIN as a standard requirement on their business checking process. Bank of America and Wells Fargo follow the same pattern. These banks treat the EIN as the legal identifier for the business, separate from the owner's personal tax ID.

Online banks and smaller regional institutions are more variable. Some, like Mercury and Brex, will open accounts for single-member LLCs using a Social Security number if you declare the LLC is taxed as a sole proprietorship. Others, like Stripe's business banking or some community banks, ask for an EIN but do not enforce it strictly if you cannot provide one when ready. The bank's underwriting team may approve the account pending receipt of the EIN within 30 days.

The IRS itself does not require an EIN for a single-member LLC unless the LLC has employees or files certain tax forms. But the bank's internal compliance rules often exceed the IRS minimum. If you are turned down for an account because you lack an EIN, the fastest path forward is to obtain one before reapplying—not to shop for a bank with looser standards, because you will eventually need the EIN anyway.

How to get an EIN if you do not have one

An EIN is free and takes minutes to obtain. The IRS offers three methods: online at irs.gov (fastest, when ready confirmation), by phone at 1-800-829-4933 (also when ready), or by mail using Form SS-4 (takes two to four weeks). You do not need a lawyer, accountant, or paid service—the IRS website walks you through the questions directly.

To explore online or by phone, you will need your LLC's legal name, the state where it was formed, your personal Social Security number, and the date your LLC was formed (from your Articles of Organization). The IRS will ask what type of business you operate and how many employees you have. Once approved, you receive the EIN when ready and can use it right away. The IRS will mail a formal confirmation letter within two weeks, but you do not need to wait for it to open a bank account.

If you explore by mail, send Form SS-4 to the IRS address listed on the form for your state. Processing takes two to four weeks. During that time, you can tell the bank you have applied and ask whether they will hold the account pending receipt of the EIN, or whether you need to reapply once you receive it.

What documents to bring to the bank

Bring your Articles of Organization (the state filing that created your LLC), a government-issued photo ID, and your EIN confirmation or Social Security number. Some banks also ask for a business license or DBA (Doing Business As) certificate if you operate under a name different from your LLC's legal name. A few banks request a resolution or authorization letter stating who is authorized to open and manage the account, though this is less common for single-member LLCs.

If you are opening the account in person, the bank will verify your identity and the LLC's existence by checking your documents. If you are opening online, you will upload images of these documents and may be asked to verify your identity through a video call or by answering security questions. The bank will then contact the state to confirm your LLC is in good standing, which usually takes one to three business days.

What happens if you open an account without an EIN

If the bank allows you to open an account using your Social Security number, the account will be reported to the IRS under your personal tax ID, not the business name. This creates a mismatch: your business tax return will show the LLC's name and (eventually) the EIN, but the bank's 1099 or other income reports will come under your Social Security number. The IRS can usually match these together, but it adds friction to your tax filing and increases the chance of a notice or request for clarification.

Once you obtain an EIN, contact the bank and ask to update the account. Most banks can do this over the phone or through online banking by providing the new EIN. Some banks require you to visit in person or to close the old account and open a new one under the EIN. Ask the bank which process they use before you obtain the EIN, so you know what to expect.

Single-member versus multi-member LLC tax structure

A single-member LLC can be taxed as a sole proprietorship (the default) or as an S-corporation or C-corporation. If you have chosen to be taxed as a corporation, you must have an EIN—the IRS requires it. If you are taxed as a sole proprietorship, an EIN is optional but recommended for the reasons above.

A multi-member LLC (two or more owners) is taxed as a partnership by default and must have an EIN. There is no exception. If you have a multi-member LLC and do not yet have an EIN, obtain one before approaching the bank—no bank will open a multi-member LLC account without one.

You can check your LLC's tax classification by reviewing the tax election form you filed (Form 8832 or Form 2553) or by asking your accountant. If you have not filed an election, your LLC is using the default classification for its structure.

Why banks ask for an EIN even when it is not required

Banks request an EIN because it simplifies their compliance and reporting. An EIN is the standard business identifier in the U.S. financial system, and using it reduces the risk of mixing personal and business finances in the bank's records. It also makes it easier for the bank to file Currency Transaction Reports (CTRs) and Suspicious Activity Reports (SARs) with the Financial Crimes Enforcement Network (FinCEN) if needed.

From the bank's perspective, asking for an EIN upfront is simpler than evaluating whether your specific LLC structure requires one. It is a blanket policy that applies to all business accounts, which reduces the chance of error or inconsistency.

Frequently Asked Questions

Can I use my Social Security number instead of an EIN if I have a single-member LLC?

Some banks will allow it, but most large banks will not. Even if a bank accepts your Social Security number, the IRS will eventually need the EIN for tax reporting purposes. It is simpler to obtain the EIN first and avoid having to update the account later.

How long does it take to get an EIN?

Online or by phone: when ready (you receive the number the same day). By mail: two to four weeks. You can use the EIN right away; you do not need to wait for the confirmation letter to arrive.

What if the bank says they will not open an account without an EIN and I do not have one yet?

explore for the EIN online or by phone (takes minutes), then return to the bank with the confirmation. Some banks will also let you explore for the account and provide the EIN within 30 days, but do not count on this—it is faster to obtain the EIN first.

Do I need an EIN if my LLC has no employees?

Not for tax purposes, unless your LLC is taxed as a corporation. But most banks require one anyway as a matter of policy. Even if the bank does not, obtaining one is free and takes minutes, so it is worth doing to avoid confusion later.

Can I change the account from my Social Security number to an EIN after opening it?

Yes, but the process varies by bank. Some allow you to update it online or by phone; others require a visit in person or closing and reopening the account. Ask your bank which process they use before you open the account.