How to Recover a Lost EIN Number: 6 Practical Ways for Business Owners

Your Employer Identification Number, or EIN, is one of the most important identifiers tied to your business. You may need it to file taxes, open a business bank account, hire employees, apply for permits, or complete vendor paperwork. If you lose track of it, the result is usually not a crisis, but it can slow down important business tasks.

The good news is that an EIN is usually recoverable through records you already have or through the IRS. In this guide, you’ll learn six practical ways to find a lost EIN number, when to contact the IRS, and how to keep the number organized for the future.

What Is an EIN?

An EIN is a nine-digit federal tax identification number assigned by the IRS to many businesses operating in the United States. It is used to identify a business for tax and reporting purposes.

You may need an EIN if your business:

• Has employees
• Operates as a corporation or partnership
• Files certain excise, employment, or withholding tax returns
• Opens a business bank account
• Works with vendors, contractors, or payment processors that request tax information

Even sole proprietors sometimes use an EIN instead of a Social Security number for privacy and administrative reasons.

Why Losing an EIN Matters

Losing an EIN does not mean the number is gone forever. In most cases, the issue is simply that the business owner no longer has the original notice or records.

Still, the number matters because it appears on tax filings, payroll records, banking forms, and state documents. If you cannot locate it quickly, you may face delays with:

• Tax filings
• Payroll setup
• Banking and lending applications
• State registration updates
• IRS correspondence

The best approach is to search methodically and use the records most likely to contain the EIN before contacting the IRS.

1. Check the IRS Confirmation Letter

The fastest place to find a lost EIN number is usually the IRS confirmation notice, often referred to as the CP 575 letter. This is the official document the IRS sends when an EIN is issued.

Look through:

• Physical business files
• Digital document folders
• Email inboxes and attachments
• Tax preparation records

If you used a service provider, accountant, or formation platform to apply for the EIN, ask whether they retained a copy of the confirmation letter.

2. Review Old Tax Returns and Payroll Filings

Your EIN appears on many federal and state business tax forms. If your business has filed taxes before, you may already have the number in past records.

Check these documents:

• Prior-year business income tax returns
• Payroll tax returns
• Sales tax filings
• Estimated tax records
• W-2 and 1099 support files
• Copies of state registration forms that requested federal tax information

If you use accounting software, search the business profile, tax settings, or archived filings. Many systems store the EIN in company metadata or saved return templates.

3. Look at Bank, Lending, and Payment Records

Banks and payment platforms often ask for an EIN when you open an account or set up merchant services. These records can be especially useful if your business formation documents are scattered.

Check with:

• Business bank account applications
• Merchant service agreements
• Loan applications
• Credit card processor onboarding forms
• Payroll service setup records

If you worked with a bookkeeper, CFO, or outside administrator, they may also have the EIN in the company files they manage.

4. Search State Formation and Licensing Documents

While the EIN is a federal number, it is often linked to state filings and local registrations. If your business formed an LLC or corporation, the EIN may appear in the records associated with that entity.

Look through:

• Articles of organization or incorporation records
• Foreign qualification documents
• Business license applications
• Annual report forms
• State tax registrations
• Local permit filings

This is especially helpful if your business was formed recently and the EIN was gathered during the startup process.

5. Contact the IRS Business and Specialty Tax Line

If your records do not turn up the EIN, the next step is to contact the IRS directly. The IRS can sometimes confirm an EIN by phone to an authorized person associated with the business.

Before you call, gather basic information such as:

• The legal name of the business
• The business address on file
• The responsible party’s name and taxpayer identification details
• The entity type and formation date
• Any prior IRS notices or filings

Be prepared for identity verification. The IRS will not release business tax information to just anyone, so the caller must generally have authority to act for the business.

If you changed addresses, owners, or officers, make sure your records are current before contacting the IRS.

6. Ask the Person or Provider Who Applied for It

Many business owners never personally handled the EIN application. The number may have been obtained by:

• A CPA or tax preparer
• A formation service
• An attorney
• An internal admin team member
• A previous owner or manager

If that is the case, request the original EIN notice or confirmation from the person or firm that filed the application. This is often the simplest way to recover the number without a second round of government calls.

What to Do If You Still Cannot Find It

If all records fail, do not guess the number. Using the wrong EIN can create filing errors and banking problems.

Instead:

1. Recheck your business records, including archived emails and scanned documents.
2. Confirm whether the business ever received an EIN in the first place.
3. Call the IRS with the proper authorization.
4. Speak with your accountant or legal advisor if your business has changed ownership, structure, or tax status.

In some cases, a business may need a new EIN if the legal entity changes in a way that requires one. That is a separate issue from simply misplacing the number, so it is worth confirming before taking action.

How to Keep Your EIN Safe Going Forward

Once you recover the number, store it in more than one secure place. A simple organization system can prevent future delays.

Best practices include:

• Saving the IRS confirmation letter in a secure digital folder
• Keeping a printed copy in your corporate records book
• Recording the EIN in your accounting and payroll systems
• Limiting access to only authorized personnel
• Backing up key business documents in encrypted storage

If your business uses a formation and compliance workflow, make sure the EIN is captured alongside your formation records, tax notices, and state filings.

How Zenind Can Help Business Owners Stay Organized

Keeping formation and tax records organized is easier when your company setup is handled cleanly from the start. Zenind helps U.S. entrepreneurs manage formation tasks with a streamlined process that makes it easier to keep essential business documents in one place.

That kind of structure matters when you need quick access to identifiers like your EIN, state registration records, and compliance paperwork.

Final Thoughts

A lost EIN number is usually recoverable if you know where to look. Start with your IRS confirmation letter, then review tax filings, banking documents, and state records. If needed, contact the IRS or the person who originally filed the application.

The key is to treat your EIN like any other critical business record: store it securely, back it up, and make sure the right people can access it when needed.