If you have two EINs for the same business, the fix is to figure out which number is the real one, call the IRS to deactivate the duplicate, follow up with a short written request, and then correct any tax filings that went out under the wrong number. The IRS will not cancel an EIN because the number is permanent, but it will close the account tied to the duplicate so your business operates under a single identifier going forward.
First, Confirm the Duplicate Is Actually a Duplicate
Some second EINs are supposed to exist. The IRS requires a new number when a business changes ownership or legal structure in specific ways: a sole proprietor who incorporates, forms a partnership, or declares bankruptcy; a corporation that receives a new charter from the secretary of state, becomes a subsidiary, converts to a partnership or sole proprietorship, or merges to create an entirely new corporation; a partnership that incorporates, dissolves so one partner continues alone, or ends and starts a new partnership; and an LLC that terminates and forms a new corporation or partnership, or a single-member LLC that must begin filing employment or excise taxes.1Internal Revenue Service. When to Get a New EIN
In those situations, both numbers are legitimate and each stays tied to its own entity. What does not require a new EIN: changing your business name, moving, electing S corporation status, or surviving a corporate merger. An LLC that switches from partnership classification to a corporation tax election also keeps its existing number. If your second EIN came from one of these situations, from losing the original and reapplying, from a formation service that ran a fresh application as part of its standard process, or from a mix-up during an acquisition or change in responsible party, you have an unnecessary duplicate.
Decide which number is the keeper before you call. It is almost always the one issued first and used on prior filings.
What Happens if You Leave Both Numbers Active
The IRS matches every electronically filed return against its database to confirm the EIN and business name correspond. File under the wrong EIN and the return rejects.2Internal Revenue Service. Using the Correct Name Control in E-Filing Corporate Tax Returns Meanwhile the other EIN sits in the system looking like an active business that never filed. The IRS generates automated notices for the missing returns on that account, and those can escalate into proposed assessments, penalties, and interest on returns you never actually owed.
Information returns are where the money adds up fastest. W-2s or 1099s issued under the wrong EIN are treated as filed with an incorrect taxpayer identification number. For returns due in 2026, the penalty per form is $60 if corrected within 30 days, $130 if corrected by August 1, and $340 if not corrected at all. Intentional disregard pushes it to $680 per form with no cap. Each incorrect return and each incorrect payee statement counts separately, so even a small employer can be looking at thousands of dollars.3Internal Revenue Service. Information Return Penalties
Banks verify EINs when you open accounts, apply for credit, or process transactions. Two EINs produce two separate business profiles in credit reporting systems, splitting your payment history. Payroll providers run into similar trouble when tax deposits reference an EIN that does not match IRS records, which can bounce the deposit or create mismatches that take weeks to clear up.
How to Deactivate the Extra EIN
Call the IRS Business and Specialty Tax Line
Dial 800-829-4933 and have the following ready: the full legal name and mailing address of your business, both EINs, and the address that was on file for each EIN when it was assigned. The agent will confirm which number to keep and tell you whether the deactivation can be handled on the call or whether you need to send a letter.4Internal Revenue Service. Telephone Assistance Contacts for Business Customers
Send the Deactivation Letter
The IRS cannot cancel an EIN, but it will close the account linked to the unwanted number. The written request should include your business’s legal name, address, the EIN you want deactivated, and a brief explanation of why the duplicate exists. Attach the original EIN assignment notice (CP 575) if you still have it.
Mail the letter to:
Internal Revenue Service
MS 6055
Kansas City, MO 64108
or
Internal Revenue Service
MS 6273
Ogden, UT 84201
You can also fax the request to 855-214-7520. Tax-exempt organizations should use the Ogden address with “Attn: EO Entity” on the envelope.5Internal Revenue Service. If You No Longer Need Your EIN Keep the IRS response in your permanent business files. The deactivated number never disappears from the IRS database entirely, and documentation protects you if an automated mismatch notice surfaces later.
Fix Any Returns Filed Under the Wrong Number
Employment Tax Returns
Quarterly or annual employment tax returns filed under the duplicate need corrected versions filed under the right EIN. Use Form 941-X to correct a quarterly Form 941, Form 943-X for agricultural employment returns, Form 944-X for annual employment returns, and Form 945-X for withheld federal income tax returns. Form 940 (federal unemployment tax) has no separate correction form; check the “amended return” box on a new Form 940. File the corrections as soon as you catch the error.6Internal Revenue Service. Correcting Employment Taxes
W-2s Already Issued to Employees
Employees whose W-2 shows the wrong EIN need a corrected form. File Form W-2c (Corrected Wage and Tax Statement) with Form W-3c (Transmittal of Corrected Wage and Tax Statements) for each year affected, using the correct EIN on the replacement forms. Give each employee their W-2c promptly so they can amend their personal return if they need to.7Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing
1099s Already Issued to Contractors
Contractors who received a 1099-NEC or other 1099 with the incorrect EIN should get a corrected form directly from you. If a contractor has already filed a personal return using the bad number, they may need to file Form 1040-X to amend. Speed matters because the per-form penalties for incorrect information returns climb the longer the error sits.8Internal Revenue Service. What to Do When a W-2 or Form 1099 Is Missing or Incorrect
Update Everyone Else Who Has the Old Number
Once the IRS confirms the deactivation, walk through every place the EIN appears and replace the duplicate with the correct number.
- Bank accounts and credit lines. Notify every financial institution where the business holds an account; some banks will ask for a new W-9 reflecting the correct EIN.
- State tax agencies. Your state revenue department and state labor or unemployment insurance agency likely reference your federal EIN, and both need updating.
- Payroll providers. Give any third-party payroll service the correct EIN before the next deposit or filing cycle so nothing routes to the closed account.
- Vendors and clients. Anyone who holds your EIN for 1099 reporting needs the right number before the next filing season.
- Business licenses and registrations. State and local permitting agencies may be referencing the duplicate as well.
Done thoroughly, this one-time cleanup prevents the automated notices, split credit history, and payroll mismatches that keep the problem alive long after the IRS has closed the duplicate account.5Internal Revenue Service. If You No Longer Need Your EIN