You cannot change the EIN linked to an existing bank account, but you can open a new account under a different EIN

The Employer Identification Number (EIN) on a bank account is tied to the legal entity that opened it. Once the account is established, the bank will not modify the EIN in their records because it is part of the account's legal foundation — changing it would mean changing who owns the account, which creates tax and liability problems neither the bank nor the IRS will allow mid-stream.

If you need to use a different EIN, your only option is to open a new account under that EIN. The old account remains open under its original EIN unless you close it. This matters because the IRS tracks deposits and withdrawals by EIN, and mixing them creates reconciliation headaches at tax time.

The reason this rule exists: your bank account is a legal contract between your business entity and the bank. The EIN identifies which entity holds the account. Changing the EIN would be like changing the name on a deed to a house — it requires closing the old agreement and starting a new one.

Key Takeaways

  • Banks will not change the EIN on an existing account because the EIN is part of the account's legal ownership structure.
  • If you need a different EIN, you must open a new bank account under that EIN and close or leave the old one.
  • The IRS ties all deposits and withdrawals to the EIN on file, so using the wrong EIN on transactions creates tax reporting problems.
  • If your business structure changed (sole proprietor to LLC, for example), you received a new EIN and will need a new account to match it.
  • Closing an old account does not erase its history — the bank keeps records, and the IRS has already received reports tied to that EIN.

When you actually need a new account with a different EIN

You need a new account when your business structure changes and the IRS issued you a new EIN. This happens when you convert a sole proprietorship to an LLC, form a partnership, incorporate, or change from one business entity type to another. Each structure gets its own EIN, and the IRS treats it as a different taxpayer.

You do not need a new account if you straightforward renamed your business. A name change does not trigger a new EIN — you keep the same EIN and update your Doing Business As (DBA) information with the bank. Call your bank's business services line and ask them to update your account name in their system. This takes a few days and costs nothing.

You also do not need a new account if you made a mistake writing the EIN when you opened the account. If the EIN in the bank's system is wrong but the account is still in your name and you control it, contact your bank when ready. Some banks can correct a typo in the EIN field before the account has been active for very long, though this depends on the bank's policies and how much activity has already posted. The sooner you catch it, the better your chances.

How to open a new account under a different EIN

Gather the documents the bank requires for a new business account: your EIN letter from the IRS (the notice you received when the EIN was issued), a government-issued ID, and your business formation documents (articles of incorporation, LLC operating agreement, or partnership agreement, depending on your structure). Some banks also ask for a business license or DBA certificate if you operate under a name different from your legal entity name.

Visit your bank in person or call their business services department to open the account. Tell them you are opening a new account under a new EIN because your business structure changed. They will run a background check and verify the EIN with the IRS database. This verification usually takes one to three business days.

Once the new account is open, you will have two separate accounts: the old one under the original EIN and the new one under the new EIN. You control both until you decide to close the old one. Do not close it when ready — wait until you have moved all recurring deposits and payments to the new account and confirmed everything is working. This usually takes two to four weeks.

What happens to the old account and its history

The old account remains open and active unless you close it. The bank keeps all transaction history tied to that account and that EIN indefinitely. The IRS also has a record of every deposit and withdrawal that posted to that account, matched to the EIN on file.

When you close the old account, the bank will ask what to do with any remaining balance. You can transfer it to the new account or request a check. Closing does not erase the account history — the bank and the IRS retain records for at least seven years for tax purposes. If you are ever audited, the IRS can pull up transactions from closed accounts.

This is why it matters to close the old account cleanly: if you leave it open and active, you will have two accounts reporting to the same business at tax time, which confuses your bookkeeper and can trigger IRS questions. Close it once you are certain all your business is running through the new account.

If your bank says they can change the EIN

Some smaller banks or credit unions may offer to update the EIN in their system, especially if the change is recent and the account has minimal activity. This is not the same as the bank officially changing the account's legal EIN — they are usually just updating a field in their internal notes while the account's legal structure remains unchanged.

If a bank tells you they can change the EIN, ask them in writing what they are actually doing. Specifically ask: "Will this change the EIN that appears on my 1099s and tax documents, or are you only updating internal notes?" If they are only updating notes, the IRS will still report the account under the original EIN, and you will have a mismatch between what the bank shows you and what the IRS sends to you at tax time.

The safest approach is still to open a new account. It takes a few days longer, but it eliminates confusion and ensures your tax documents match your bank records.

Moving money and payments to your new account

Before you close the old account, move all automatic deposits and payments to the new one. This includes payroll deposits, customer payments, vendor payments, loan payments, and any other recurring transactions. Contact each party separately — do not assume that updating your bank information in one place updates it everywhere.

For payroll, contact your payroll processor or HR department and provide them with the new account number and routing number. They will need to update their records and may require a voided check from the new account as proof. This change usually takes effect in the next pay cycle.

For customer payments, update your invoices and payment instructions. For vendor payments, log into each vendor's system and update your payment account. For loan payments, contact the lender directly. Each of these can take a few days to process, so plan ahead if you have a payment due soon.

Tax reporting and the EIN mismatch problem

If you use the wrong EIN on a transaction, the bank and the IRS will record it under that EIN. If you deposit a check made out to your new EIN into your old account (or vice versa), the deposit posts to the old account but the check was issued to the new EIN. This creates a mismatch in your tax records.

The IRS will send you a 1099 form for the old account under the old EIN and a separate 1099 for the new account under the new EIN. If you deposited money into the wrong account, the 1099 will not match your business records, and you will have to explain the discrepancy if you are audited.

To avoid this, do not deposit checks or transfers into the old account once you have opened the new one. If you accidentally do, contact the bank and ask if they can reverse the transaction and redeposit it into the new account. Most banks can do this if you catch it within a few days.

Frequently Asked Questions

Can I use my old account number with the new EIN?

No. The account number and the EIN are linked in the bank's system. A new EIN requires a new account number. If you try to use an old account number with a new EIN, the transaction will either be rejected or post to the old account under the old EIN, creating the mismatch problem.

Will closing my old account hurt my business credit?

Closing a bank account does not affect your business credit score. Business credit is based on payment history with vendors and lenders, not on bank accounts. However, if you have an outstanding loan tied to that account, contact the lender before closing to make sure the payment arrangement is not disrupted.

How long does it take to open a new account with a different EIN?

Most banks complete the verification and account setup within one to three business days. Some banks offer same-day or next-day accounts if you open in person. The IRS verification is the step that usually takes the longest, but most banks have automated systems that check the EIN database in real time.

What if I have a loan or line of credit tied to my old account?

Contact the lender before you close the old account. Some loans are tied to the account itself, and closing it could trigger a default clause. The lender may require you to move the loan to a new account or may allow you to keep the old account open specifically for loan payments while you move everything else to the new account.

Do I have to close the old account, or can I just leave it open?

You can leave it open, but it is not recommended. An open account under an old EIN that is no longer active in your business creates confusion at tax time and makes your bookkeeping harder. If the account is truly inactive, closing it is cleaner. If you still need it for a specific purpose (like a loan payment), keep it open but make sure all other activity is on the new account.