You usually need an EIN to open a business bank account, but not always

Whether you need an Employer Identification Number (EIN) depends on your business structure and how the bank classifies you. A sole proprietor can sometimes open a business account using a Social Security Number instead. A partnership, corporation, or LLC almost always needs an EIN. Banks have different rules, and some will not open a business account without one, while others will accept an SSN for certain business types.

The safest approach: get an EIN before you try to open the account. It is free, takes about 15 minutes online, and removes the guesswork. If you already have one, bring it. If you do not, the bank will tell you whether you can proceed without it or need to get one first.

Key Takeaways

  • Sole proprietors can sometimes use their Social Security Number to open a business bank account, but many banks now require an EIN regardless of business structure.
  • Partnerships, LLCs, S-corps, and C-corps must have an EIN before opening a business account.
  • You can get an EIN free from the IRS online at irs.gov/ein, and it takes about 15 minutes.
  • Bring your EIN (or SSN if you are a sole proprietor without an EIN) and your business formation documents to the bank.
  • If a bank refuses to open an account without an EIN and you do not have one yet, get one before returning.

Which business structures require an EIN

If your business is structured as a partnership, LLC, S-corporation, or C-corporation, you must have an EIN. The IRS assigns these numbers to all business entities except sole proprietorships and single-member LLCs that have not hired employees.

A sole proprietor — someone running a business under their own name with no employees — does not legally need an EIN. You can use your Social Security Number instead. However, many banks now require an EIN even for sole proprietors, so check with your bank before assuming your SSN will work.

A single-member LLC (one owner) is treated like a sole proprietorship for tax purposes unless you elect otherwise. You do not need an EIN unless you have employees or want to keep your business finances completely separate from your personal taxes. Again, your bank may have its own rule.

How to get an EIN before opening your account

Go to irs.gov/ein and use the online application. You will need your Social Security Number, the legal name of your business, the business address, and the date you started or plan to start. The form takes about 15 minutes and you get your EIN immediately on screen.

If you cannot apply online — for example, if you are a non-US citizen — you can mail Form SS-4 to the IRS or fax it. Mail takes about four weeks; fax takes about two weeks. For a business bank account, online is fastest.

Write down your EIN as soon as you receive it. You will need it when you sit down with the bank. The IRS will also email you a confirmation, but the number on screen is valid right away.

What documents to bring to the bank

Bring your EIN (or SSN if you are a sole proprietor without an EIN) and at least one form of business identification. For an LLC or corporation, that means your Articles of Organization or Articles of Incorporation — the document you filed with your state to create the business. For a sole proprietor, a business license or DBA (Doing Business As) certificate works if you have one.

You will also need a personal ID (driver's license or passport) and proof of address (utility bill, lease, or bank statement). Some banks ask for a business address separate from your home; others do not. Call ahead and ask what they need so you do not make a second trip.

If you have not yet filed your business formation documents with your state, the bank may ask you to do that first. You cannot open a business account for an LLC or corporation that does not legally exist yet.

What happens if the bank will not open an account without an EIN

If you are a sole proprietor and the bank refuses to open an account with only your SSN, you have two options: get an EIN, or find a different bank. Some banks are stricter than others. Credit unions and smaller regional banks are sometimes more flexible than large national chains.

Getting an EIN takes 15 minutes online, so it is usually faster than bank-shopping. Once you have it, you can open the account at your first choice of bank.

EIN versus SSN: what the bank actually needs

Banks use your EIN (or SSN for sole proprietors) to report business account activity to the IRS and to run background checks. An EIN is a nine-digit number formatted as XX-XXXXXXX. An SSN is nine digits formatted as XXX-XX-XXXX. They serve the same purpose for the bank's paperwork, but an EIN keeps your business finances separate from your personal credit history.

Using your SSN for a business account means business debt and payment history can affect your personal credit score. Using an EIN keeps them separate. This is another reason many business owners get an EIN even if they do not legally need one.

Timeline: when to get your EIN before opening the account

Get your EIN before you go to the bank. It takes 15 minutes online and you have the number immediately. There is no reason to wait or to try opening the account first and then scrambling for an EIN if the bank asks for one.

If you are applying by mail or fax because you cannot use the online system, plan for two to four weeks. In that case, contact your bank now and ask whether they will hold a spot for you or whether you need the EIN in hand before they will even schedule an appointment.

Frequently Asked Questions

Can I open a business bank account with just my Social Security Number?

It depends on your business structure and your bank's policy. Sole proprietors can sometimes use an SSN, but many banks now require an EIN for all business accounts. Call your bank and ask before you go in.

What if I have not filed my LLC or corporation yet?

You need to file your business formation documents with your state first. The bank will ask to see them. You can get an EIN before filing, but you cannot open a business account for an entity that does not legally exist yet.

Do I need an EIN if I have not hired any employees yet?

Not legally, if you are a sole proprietor. But your bank may require one anyway. Check with them first. If you plan to hire employees later, getting an EIN now saves you a step.

How long does it take to get an EIN?

Online: 15 minutes, number issued immediately. Fax: about two weeks. Mail: about four weeks. For a business bank account, apply online.

What if I already have an EIN from a previous business?

You cannot reuse an old EIN for a new business. Each business entity gets its own EIN. You will need to get a new one for your current business.