Whether you need an EIN depends on your business structure and how the bank will hold the account
You need an Employer Identification Number (EIN) if your business is a corporation, partnership, LLC with multiple members, or S-corporation. You do not need one if you are a sole proprietor operating under your own name, though you may want one anyway. Some banks will open a business account under a sole proprietorship using only your Social Security Number (SSN), while others require an EIN regardless of structure. The requirement varies by bank and by what you tell them about your business setup.
An EIN is a nine-digit number issued by the Internal Revenue Service. It functions as a tax ID for your business, separate from your personal SSN. The IRS uses it to track business income, employment taxes, and other filings. Banks use it to verify that a business entity actually exists and to set up the account in the correct legal name.
Key Takeaways
- Corporations, partnerships, and multi-member LLCs must have an EIN before opening a business bank account; sole proprietors may use their SSN instead.
- You can obtain an EIN free from the IRS online, by phone, or by mail, and the online process is processed when ready.
- Banks vary in their requirements — some accept SSN for sole proprietors, others demand an EIN for any business account.
- You will need your EIN (or SSN) plus your business formation documents, such as articles of incorporation or an operating agreement, to open the account.
- If you do not yet have an EIN but your business structure requires one, you must obtain it before the bank will open the account.
Business structures that require an EIN
If your business is organized as a corporation (C-corp or S-corp), you must have an EIN. The IRS treats a corporation as a separate legal entity from its owners, and the bank will require proof of that entity — which is the EIN. You cannot open a corporate account using only your personal SSN.
A partnership — whether general or limited — also requires an EIN. The partnership itself is the account holder, not the individual partners. The bank needs an EIN to distinguish the partnership's money from each partner's personal funds.
An LLC with more than one member requires an EIN for the same reason: the LLC is the legal entity, and the bank account belongs to the LLC, not to the owners individually. If you are the sole owner of an LLC, you have a choice — you can use your SSN or obtain an EIN — but many banks prefer the EIN to keep business and personal finances clearly separated.
When sole proprietors can use their SSN instead
A sole proprietorship is not a separate legal entity. You and your business are the same for tax and legal purposes. Because of this, some banks will allow you to open a business account using your Social Security Number, with the account registered under your personal name or your business name (if you have registered a DBA — "doing business as" — with your state or county).
However, not all banks follow this rule. Some require an EIN even for sole proprietors, either as a blanket policy or because they want to reduce fraud risk. Before you go to the bank, call and ask whether they will open a business account for a sole proprietor using only an SSN. If they say no, you will need to obtain an EIN first.
Many sole proprietors obtain an EIN anyway, even when not required, because it keeps business and personal finances more clearly separated on tax forms and makes it easier to hire employees later without explore for a new number.
How to obtain an EIN before opening your account
The IRS offers three ways to obtain an EIN, all free. The fastest is the online process at irs.gov/ein. You answer questions about your business structure, location, and the type of work you do. The system issues your EIN when ready, and you can print a confirmation letter right away. This takes about 15 minutes.
You can also explore by phone by calling the IRS Business and Specialty Tax Line at 1-800-829-4933. You will need the same information as the online form. Processing takes a few minutes, and the IRS will mail you a formal letter with your EIN within two weeks.
A third option is to mail Form SS-4 to the IRS. This is slower — allow four to six weeks for processing — but it works if you do not have internet access or prefer a paper record. You can read the form from irs.gov.
Whichever method you use, have your business formation documents ready. You will need to provide your business structure, the date you started or plan to start, your business address, and the reason you are requesting an EIN (in this case, to open a bank account).
What documents the bank will ask for
When you arrive to open the account, bring your EIN (or SSN if you are a sole proprietor using that instead), a government-issued photo ID, and your business formation documents. For a corporation, this means your articles of incorporation and a certificate of good standing from your state. For an LLC, bring your operating agreement and a certificate of good standing. For a partnership, bring your partnership agreement and any state registration documents.
If you registered a DBA, bring that registration as well. The bank uses these documents to verify that the business exists, that you have the authority to open an account on its behalf, and that the account name matches your legal business name.
Some banks also ask for a resolution — a document signed by the business owners or board authorizing you to open the account. This is more common for corporations and larger LLCs. Ask the bank in advance whether they require one; if they do, you can draft a straightforward resolution or use a template from your state's Secretary of State office.
Timing: when to get your EIN relative to opening the account
You must have your EIN before you walk into the bank, not after. The bank will not hold an account open while you wait for the IRS to issue a number. If you explore online, you can have an EIN the same day and open the account when ready. If you explore by phone, you can open the account the same day or the next day once you have the confirmation number. If you mail Form SS-4, plan for four to six weeks.
Do not wait until you are ready to open the account to explore for an EIN. explore as soon as you have finalized your business structure and registered your business with the state (if required). This way, the EIN is ready when you are.
Why banks have different EIN requirements
Banks set their own account-opening policies within regulatory limits. Some treat any business account as requiring an EIN, regardless of structure, because it simplifies their verification process and reduces the risk of personal and business funds being mixed. Others follow the IRS rule more closely and accept an SSN for sole proprietors.
Larger banks and national chains often have stricter policies than smaller regional or community banks. If one bank turns you down because you do not have an EIN, another bank may accept your SSN. It is worth calling a few banks to compare their requirements before you decide whether to obtain an EIN.
Frequently Asked Questions
Can I open a business account with just my SSN if I have an LLC?
It depends on the bank and whether your LLC has one member or more than one. Single-member LLCs can sometimes use an SSN, but most banks prefer an EIN. Multi-member LLCs require an EIN. Call the bank first to ask their specific policy.
How long does it take to get an EIN?
The online process at irs.gov/ein issues an EIN when ready. Phone applications take a few minutes and you receive a confirmation number on the call. Mail applications take four to six weeks. The online method is fastest if you need the number before opening your account.
Do I need an EIN if I am a sole proprietor with no employees?
No, the IRS does not require it. However, your bank may require one to open a business account. Call your bank first. Many sole proprietors obtain an EIN anyway to keep business and personal finances separate, even when not required.
What if I explore for an EIN but the bank rejects my process anyway?
Banks can decline an account for reasons beyond the EIN — such as your personal credit history, the nature of your business, or their internal risk policies. If this happens, ask the bank in writing why they declined and whether you can reapply. You may also try a different bank with less restrictive policies.
Can I use someone else's EIN or SSN to open a business account?
No. The account must be opened in the name of the actual business owner or entity. Using another person's number is fraud and will result in the account being closed and reported to authorities.