Where Can I Find My EIN Number: Best Ways to Locate Your Business Tax ID

Starting and managing a business involves keeping track of important financial and tax information. One of the most essential identifiers is your Employer Identification Number (EIN), a unique number issued by the Internal Revenue Service to identify business entities for federal tax purposes.

But what happens when you cannot remember your number or locate the original confirmation letter?

If you are asking, “where can I find my EIN number?”, the good news is that several reliable recovery methods are available. You may find it on previously filed tax returns, original IRS documents, business banking records, or certain government applications.

The IRS also provides official assistance for authorized business owners who cannot recover their EIN through existing paperwork.

Losing access to the number can create difficulties when opening a business bank account, filing tax returns, applying for licenses, or verifying business information.

However, recovering an existing EIN is usually much simpler than applying for another one.

This guide explains where to locate your business tax ID, how to request official confirmation, what documents to review, and how to protect your EIN records in the future.

What Is an EIN Number?

An Employer Identification Number is a unique nine-digit federal tax identification number assigned by the IRS.

It is commonly used by corporations, partnerships, employers, tax-exempt organizations, and other qualifying entities.

An EIN follows a nine-digit format, commonly written as XX-XXXXXXX.

The number identifies a business for various federal reporting and administrative purposes.

According to the IRS, businesses may need an EIN to employ workers, file certain tax returns, and complete other business-related requirements.

Internal Revenue Service

EIN vs. Social Security Number

An EIN identifies a business entity, while a Social Security number primarily identifies an individual for Social Security and tax purposes.

Some sole proprietors can use their SSN for certain federal tax filings, but businesses required to use an EIN must use their assigned number.

The two identifiers are not interchangeable in every situation.

Where Can I Find My EIN Number? 7 Reliable Methods

If your EIN has been misplaced, begin with records that are already available to you.

The following methods can help recover the number without submitting a new application.

1. Check Your Original IRS EIN Confirmation

When the IRS assigns an EIN, it provides confirmation of the number.

Look for the original assignment notice, commonly known as the CP575A–J notice series, or the confirmation saved after your online application.

Original EIN Confirmation

Search your business files, scanned documents, and downloaded PDFs for the original IRS confirmation. It is often the fastest way to recover an existing EIN.

The IRS does not recreate the original CP575A–J notice, but other official verification documents are available.

Internal Revenue Service

2. Review Previously Filed Business Tax Returns

Business tax returns commonly contain the EIN near the taxpayer identification section.

Depending on your business structure, you may find it on Form 1120, Form 1120-S, Form 1065, or applicable employment tax forms.

Previous Business Tax Returns

Review copies of filed returns rather than blank forms. The number used on prior federal business filings may be the EIN you need.

If you worked with an accountant, they may also have copies of documents previously prepared for your business.

3. Contact Your Business Bank

Many financial institutions request an EIN when a business opens an account.

If you provided your EIN during account setup, the bank may have it in its records.

Contact your bank through its official customer support channel and ask whether authorized account holders can obtain the recorded business tax ID.

You may need to complete identity verification.

4. Search Business Licensing Documents

Some state and local government agencies request federal tax identification information during licensing or registration.

Review any existing business license applications, agency correspondence, or saved registration documents.

If you cannot access the original paperwork, contact the agency where the application was submitted.

The IRS specifically lists banks and licensing agencies among the places business owners should check for a forgotten EIN.

Internal Revenue Service

5. Check Your IRS Business Tax Account

The IRS offers an online Business Tax Account for eligible businesses and authorized users.

In 2026, the IRS expanded its digital EIN verification features.

Eligible account users can now download a digital CP575 EIN Verification Notice, which can substitute for the original notice series or Letter 147C for supported verification purposes.

Internal Revenue Service

IRS Business Tax Account

Eligible business owners can access tax records and verification documents using the official IRS online service. Features depend on business type and authorized role.

Visit the official IRS Business Tax Account page to review eligibility.

6. Call the IRS Business and Specialty Tax Line

When existing records are unavailable, contact the IRS directly.

The official number is 800-829-4933.

The business assistance line operates Monday through Friday, from 7 a.m. to 7 p.m. local time. Alaska and Hawaii residents follow Pacific time.

The IRS verifies the caller’s identity and authority before providing an EIN.

Internal Revenue Service

Have your business name, address, entity type, and other identifying information available.

Only authorized individuals can receive protected business tax information.

7. Request an Official EIN Verification Document

Sometimes you need more than the nine-digit number.

A bank, lender, or business service provider may request written confirmation.

In that situation, ask the IRS about Letter 147C or another available verification document.

EIN Verification Letter

Letter 147C confirms a previously assigned EIN. Eligible businesses may instead obtain the newer digital CP575 verification notice or an applicable IRS entity transcript.

The IRS confirms these options in its current EIN guidance.

Internal Revenue Service

How to Find Your EIN Number Online

Business owners often search for an online EIN lookup tool.

However, there is no universal public IRS search system that reveals every private company’s EIN.

Certain tax-exempt organization information and publicly disclosed business records may be searchable, but availability depends on the entity and filing requirements.

For your own business, the official IRS Business Tax Account is generally the most appropriate online starting point if you are eligible.

You can also search your securely stored documents, bookkeeping system, and previous tax records.

Avoid entering sensitive information into unfamiliar websites claiming to provide guaranteed EIN recovery.

How to Find an EIN for an LLC

Limited liability companies may need EINs for employment taxes, federal tax classification, banking, or other business purposes.

If you operate an LLC, check the original EIN confirmation, previously filed returns, business banking documents, and records maintained by your accountant.

Keep in mind that IRS Business Tax Account eligibility differs by entity structure.

For example, certain single-member LLCs reporting business activity through Schedule C or Schedule F are not currently eligible for Business Tax Account access.

Internal Revenue Service

If online access is unavailable, use the IRS telephone recovery process.

The answer to “where can I find my EIN number?” therefore depends partly on your business structure and available records.

What If You Cannot Find Your EIN Anywhere?

If all recovery methods fail, do not immediately submit another EIN application.

The IRS generally expects a business entity to use its existing assigned EIN unless a change in ownership or structure requires a new one.

Applying again unnecessarily can create confusion involving business records and tax reporting.

Instead, contact the IRS and explain that you previously received an EIN but cannot locate it.

The IRS can search its records after confirming your identity and authorization.

If you have accidentally obtained multiple EINs, the agency can help determine which number should be used.

Internal Revenue Service

You can also review this guide on where to find your EIN number for additional background. The referenced webpage could not be independently accessed during this review, so the recovery instructions in this article are based on official IRS sources.

EIN Confirmation Letter vs. EIN Number

Knowing your EIN and proving it belongs to your business are two different things.

Your bank may accept the number for some purposes but request formal documentation for others.

Document	Primary purpose
Original CP575A–J notice	Confirms the original EIN assignment
Digital CP575 notice	Provides current electronic EIN verification for eligible users
IRS Letter 147C	Confirms a previously assigned EIN
Business entity transcript	Displays EIN and related IRS entity information
Previously filed tax return	Helps locate the EIN used in earlier filings

An IRS business entity transcript may also provide the business name, address, and other entity details.

Internal Revenue Service

Ask the requesting institution which verification documents it accepts before obtaining additional paperwork.

Common EIN Recovery Mistakes to Avoid

Losing an EIN can be inconvenient, but rushing the recovery process may create additional problems.

One common mistake is applying for another EIN without first checking whether the business already has one.

Another is confusing an EIN with a state tax account number. These identifiers can serve different purposes and may not be interchangeable.

Some business owners also rely on unofficial lookup websites or share sensitive identifying information without confirming the recipient’s legitimacy.

Protect Your EIN Information

Store business tax documents securely and verify requests for sensitive information. Use official IRS channels when recovering or confirming your number.

The IRS provides EIN applications directly at no charge, so avoid assuming that a paid intermediary is necessary.

Internal Revenue Service

How to Prevent Losing Your EIN Again

Once you recover the number, create a reliable system for storing business records.

Keep a copy of your confirmation notice in a secure digital folder and maintain a protected physical backup when appropriate.

Use encrypted storage or another secure document-management system with access limited to authorized individuals.

Make sure your accountant or designated business administrator knows where approved records are maintained.

Review stored information periodically, especially when changing financial institutions or accounting software.

A simple filing system can make future tax preparation, banking applications, and business verification much easier.

Frequently Asked Questions About Finding an EIN Number

Where can I find my EIN number if I lost it?

Check your original IRS confirmation, previously filed business tax returns, business bank records, and licensing applications. If necessary, contact the IRS at 800-829-4933.

Can I look up my EIN number online for free?

Eligible business owners may access EIN verification information through the IRS Business Tax Account. You can also check previously saved digital tax documents.

Is my EIN on my business tax return?

Usually, yes. Federal business tax returns commonly display the EIN in the taxpayer identification area.

Can my bank tell me my EIN?

A financial institution may have your EIN if you supplied it when opening a business account. Availability depends on the bank’s records and verification procedures.

Can I get another EIN if I lose mine?

Normally, you should recover the existing number rather than apply again. A new EIN may be required for certain ownership or structural changes, not simply because the original number was lost.

What is IRS Letter 147C?

Letter 147C is an IRS document confirming an EIN that was previously assigned to a business or other entity.

Is an EIN the same as a federal tax ID?

An EIN is a type of federal taxpayer identification number used to identify businesses and certain other entities.

How can I find my EIN without calling the IRS?

Start with saved tax returns, original confirmation documents, bank records, licensing paperwork, or an eligible IRS Business Tax Account.

Conclusion

If you have been wondering “where can I find my EIN number?”, there are several dependable ways to recover it without submitting a new application.

Start with your original IRS confirmation letter, previously filed tax returns, business banking records, and licensing documents. Eligible business owners can also use the IRS Business Tax Account to obtain verification information.

If these options are unsuccessful, the IRS Business and Specialty Tax Line can assist after verifying your identity and authorization.

Remember that losing your EIN does not normally mean you need a replacement number. Recovering the existing identifier is usually the correct approach.

Once located, store your EIN and supporting documents securely so future banking, licensing, and tax-related tasks can be completed more efficiently.