If you have two EINs for the same business, the fix is usually straightforward: confirm that a structural change didn’t legitimately require the second number, then ask the IRS to deactivate the duplicate and correct any filings that went out under the wrong one. The IRS cannot cancel an EIN — every number it issues is permanent — but it can close the account tied to the extra number so your business operates under a single EIN going forward.
First, Check Whether the Second EIN Was Actually Required
Some business changes require a new EIN, and in those cases both numbers should stay active because each belongs to a different entity in the eyes of the IRS. You need a new EIN if you’re a sole proprietor who incorporates, forms a partnership, or declares bankruptcy; a corporation that receives a new charter, becomes a subsidiary, converts to a partnership or sole proprietorship, or merges to form a new corporation; a partnership that incorporates, dissolves down to a sole proprietor, or ends and restarts as a new partnership; or an LLC that terminates and forms a new corporation or partnership, or a single-member LLC that begins filing employment or excise taxes.
You do not need a new EIN for a name change, a move, an S corporation election, or surviving a corporate merger. An LLC changing only its tax classification also keeps its existing number. If your second EIN traces back to one of these non-triggering events, it’s a duplicate that should be deactivated.1Internal Revenue Service. When to Get a New EIN
How Businesses End Up With Two EINs
The most common cause is a lost original. An owner who can’t locate the EIN often applies for a new one online, where the IRS issues a number in minutes, when the fix was really to retrieve the existing one from an old tax return, a bank record, or the CP 575 confirmation notice.
Structural changes cause the rest. A sole proprietor who forms a single-member LLC may apply for a new number without realizing the original could carry over. Mergers, acquisitions, and changes in responsible party create administrative mix-ups. Third-party formation services sometimes apply for a fresh EIN as part of their standard process, even when the business already has one.
Why It Matters If You Do Nothing
Rejected Returns and Automated Notices
The IRS matches every e-filed return against its database, checking that the EIN and the business name control line up. File under the wrong EIN and the return rejects outright.2Internal Revenue Service. Using the Correct Name Control in E-Filing Corporate Tax Returns
At the same time, the unused EIN looks to the IRS like an active business that never filed. Automated notices go out for the missing filings, which can escalate into proposed assessments, penalties, and interest on returns you never actually owed. Cleaning that up after the notices land takes far more work than heading it off.
Penalties on W-2s and 1099s Filed Under the Wrong Number
Information returns filed with an incorrect taxpayer identification number carry per-form penalties. For returns due in 2026, the penalty is $60 per form if corrected within 30 days, $130 if corrected by August 1, and $340 if not corrected at all. Intentional disregard runs $680 per form with no cap. Those amounts apply separately to each incorrect return and each incorrect payee statement, so even a small business can face thousands in combined penalties.3Internal Revenue Service. Information Return Penalties
Banking, Credit, and Payroll Fallout
Banks verify EINs when you open accounts, apply for credit, or process transactions. Two numbers create two business profiles in credit reporting systems, which can split your payment history and make the business look thinner than it is. Payroll providers hit the same wall: tax deposits and wage reports that reference the wrong EIN can bounce or generate mismatches that take weeks to resolve with the IRS.
How to Deactivate the Duplicate
Call the IRS First
Start with the Business and Specialty Tax Line at 800-829-4933. Before you dial, have your business’s full legal name and mailing address, both EINs, and the address associated with each number when it was assigned. The agent will help you decide which EIN to keep — almost always the one issued first and used on prior filings — and will tell you whether a follow-up letter is needed or whether the account can be closed on the call.4Internal Revenue Service. Telephone Assistance Contacts for Business Customers
Send the Written Request
Because EINs are permanent, the IRS closes the account rather than cancels the number. The written request should include your business’s legal name and address, the EIN you want deactivated, and a brief reason for the duplicate. Attach the original CP 575 assignment notice if you still have it.
Mail to one of these addresses:
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 send the letter to the Ogden address with “Attn: EO Entity” on the envelope.5Internal Revenue Service. If You No Longer Need Your EIN
Fix the Filings That Went Out Under the Wrong EIN
Employment Tax Returns
Employment tax returns filed under the duplicate need to be refiled under the correct number using the matching “X” correction form: Form 941-X for quarterly Form 941, Form 943-X for agricultural returns, Form 944-X for annual employment returns, and Form 945-X for withheld federal income tax. Form 940 has no separate correction form; check the “amended return” box on a new 940 instead. File the corrections as soon as you catch the error.6Internal Revenue Service. Correcting Employment Taxes
W-2s to Employees
Employees whose W-2s show the wrong EIN need a corrected form. File Form W-2c and Form W-3c for each affected year using the correct EIN, and give each employee their W-2c promptly so they can amend their own returns if they need to.7Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing
1099s to Contractors
Contractors who received a 1099 with the wrong EIN should get a corrected form as soon as possible. If the contractor already filed a personal return using the bad information, they may need to file Form 1040-X to amend it. The per-form penalties climb the longer the error sits, so speed matters.8Internal Revenue Service. What to Do When a W-2 or Form 1099 Is Missing or Incorrect
Update Every Record That Shows the Wrong Number
Once the IRS confirms the deactivation, walk through every place your EIN appears and make sure only the correct one is on file:
- Notify every bank where the business holds accounts or credit lines. Some will ask for a new W-9.
- Update your state revenue department and state labor or unemployment insurance agency, both of which reference your federal EIN.
- Give your payroll provider the correct EIN immediately so future deposits and filings hit the right account.
- Send the corrected number to vendors and clients who have you on file for 1099 reporting.
- Check state and local business licenses and permits for the old number.
Keep the IRS confirmation letter in your permanent files. The deactivated EIN never fully disappears from IRS records, and having documentation that the duplicate was resolved protects you if the issue resurfaces in an audit or triggers a mismatch notice on a future filing.5Internal Revenue Service. If You No Longer Need Your EIN