If you have two EINs for one business, the IRS sees two separate taxpayers rather than one, and your filings, payroll deposits, and wage reports get split between accounts that don’t talk to each other. The fix is to call the IRS Business and Specialty Tax Line, confirm which number to keep, deactivate the other in writing, and correct any returns or W-2s that went out under the wrong one. Having a duplicate isn’t itself a violation, but the mismatched records it produces can trigger real penalties if you leave them alone.
First, Make Sure It’s Actually a Duplicate
Some structural changes legitimately require a second EIN, and if yours was one of them, you don’t have a duplicate at all. You have two distinct tax entities, each filing under its own number.
The IRS requires a new EIN in specific situations:
- Sole proprietors who incorporate, form a partnership, or file for bankruptcy.
- Corporations that convert to a partnership or sole proprietorship, receive a new charter from the secretary of state, become a subsidiary, or merge to create a new corporation.
- Partnerships that incorporate, end and begin as a new partnership, or continue with one partner as a sole proprietor.
- LLCs where the existing LLC terminates and forms a new corporation or partnership, or where a single-member LLC hires employees or owes excise tax for the first time.
You generally don’t need a new EIN just for changing your business name, moving, or a corporate bankruptcy.1Internal Revenue Service. When to Get a New EIN The rest of this article assumes both numbers point to what should be one entity.
What Goes Wrong When Records Are Split
The core problem is that IRS systems can’t automatically connect filings made under different EINs. If your annual income tax return went in under one number but your Form 941 payroll returns went in under another, the agency sees one entity that earned income but never paid employees, and a second that ran payroll but had no revenue. That pattern is exactly what generates notices.
Employment credits are where this hurts most. If your W-2s were filed under one EIN but your business return was under another, it can look like you never paid qualified wages. The IRS has specifically flagged mismatched W-2 filings as a basis for disallowing the Employee Retention Credit, and the same logic reaches other employment-based credits like the Work Opportunity Tax Credit.2Internal Revenue Service. Understanding Letter 105-C, Disallowance of the Employee Retention Credit
Payroll cleanup is the other expensive piece. Each quarter you filed Form 941 under the wrong EIN needs its own Form 941-X. The IRS requires a specific explanation for each correction, including what the error was, when you discovered it, and the dollar amount. Generic explanations like “administrative error” get rejected and slow processing down.3Internal Revenue Service. Instructions for Form 941-X
Penalties You Could Face
Holding two EINs isn’t itself a violation. The penalties come from what the split records did to your reporting.
The most common exposure is the accuracy-related penalty, which adds 20% to any underpayment caused by negligence or a failure to follow tax rules. If split records led you to underreport income or miscalculate withholding, the penalty applies to the shortfall.4Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
If payroll taxes went unpaid because deposits were divided between two EINs, the person responsible for payroll can face the trust fund recovery penalty. That makes the individual personally liable for the full amount of unpaid employment taxes, not just the business. The statute requires willfulness, but the IRS interprets that broadly to include knowing taxes were due and failing to make sure they got paid.5Office of the Law Revision Counsel. 26 USC 6672 – Failure to Collect and Pay Over Tax, or Attempt to Evade or Defeat Tax
Deliberately using two EINs to hide income is a separate matter. Tax evasion carries fines up to $100,000 for individuals or $500,000 for corporations and up to five years in prison. This requires willful intent and doesn’t apply to honest mistakes.6Office of the Law Revision Counsel. 26 USC 7201 – Attempt to Evade or Defeat Tax
States can add their own penalties for inconsistent EIN reporting, from fines and interest to license suspension in regulated industries. Check with your state’s department of revenue if you’ve been using the wrong number on state filings.
Which EIN the IRS Will Keep
The direction of the fix depends on what you’ve already filed:
- If you haven’t filed returns under either EIN, you can pick. If you have no preference, the IRS defaults to whichever EIN has Form 941 filing requirements attached, and if both do, it keeps the one assigned first.
- If you’ve filed under only one EIN, that’s the one you keep. The other gets deactivated.
- If returns were filed under both, only the IRS’s BMF Entity function can consolidate the accounts. You can’t finish this by phone.
So if returns only exist under one number, the cleanup is fairly quick. If both numbers have filing history, plan for a longer process involving IRS specialists who merge the account records.
How to Fix It
Call the Business Tax Line
Start with the IRS Business and Specialty Tax Line at 800-829-4933, open Monday through Friday, 7 a.m. to 7 p.m. local time. Tell the agent your business was assigned two EINs and you need to resolve the duplicate. Have both CP 575 assignment notices ready if you kept them, along with recent tax filings. If a CP 575 is missing, request Letter 147C, which confirms the EIN previously assigned to your business.8Internal Revenue Service. Telephone Assistance Contacts for Business Customers9Internal Revenue Service. Employer Identification Number
The agent will look at both accounts and tell you which EIN to keep under the rules above. If returns were filed under both, the agent refers the case to BMF Entity for consolidation.7Internal Revenue Service. 21.7.13 Assigning Employer Identification Numbers (EINs)
Deactivate the Duplicate in Writing
The IRS cannot cancel an EIN, but it can deactivate one so the number no longer carries active filing obligations. After the call confirms which number to drop, send a deactivation letter. Include your entity’s legal name, the EIN to be deactivated, your business address, the CP 575 for that number if you have it, and the reason for deactivating. Mail it to one of these addresses:
- Internal Revenue Service, MS 6055, Kansas City, MO 64108
- Internal Revenue Service, MS 6273, Ogden, UT 84201
Correct Wage and Payroll Reports
Any W-2s issued under the wrong EIN need corrected forms. File Form W-2c for each affected employee along with Form W-3c under the correct EIN. The Social Security Administration requires a separate W-3c for each tax year corrected, and you should get corrected W-2c copies to employees as soon as possible.11Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing
For quarterly payroll returns filed under the wrong EIN, file a separate Form 941-X for each quarter. On line 43, list the affected lines, the date you discovered the error, the dollar amount, and the cause. If the correction produces additional tax owed, payment is due when the IRS receives the form.3Internal Revenue Service. Instructions for Form 941-X
Update State Agencies and Financial Institutions
Once the federal side is resolved, update the surviving EIN with your state’s department of revenue, secretary of state, and any industry licensing board where the business is registered. Many states let you amend online, and amendment fees typically run $25 to $60. If the responsible party on the surviving EIN also changed, file Form 8822-B with the IRS within 60 days.12Internal Revenue Service. Form 8822-B, Change of Address or Responsible Party
Contact every bank, lender, and payment processor holding the old EIN and give them the surviving number along with any confirmation letters the IRS sent. Financial institutions verify EINs against IRS records, and a deactivated number on file can freeze transactions or complicate a loan application.
When to Bring In a Tax Professional
If returns were filed under both EINs and the IRS has to consolidate accounts, a CPA or enrolled agent is worth the cost. A tax professional can file Form 2848, Power of Attorney, to handle the resolution for you. The form has to name the exact tax periods and issues involved; the IRS won’t accept a general reference like “all years.”13Internal Revenue Service. Instructions for Form 2848, Power of Attorney and Declaration of Representative
A professional can also decide whether amended returns are needed, calculate any underpayment penalties, and take on the 941-X work, which tends to be the slowest part of the cleanup. If the duplicate has been active for several years, the corrections stack up fast, and a second mistake at this stage only deepens the problem.