How To Find An Employer Identification Number | IRS Records

An EIN is easiest to find on old tax forms, IRS letters, payroll filings, bank records, or through the IRS business help line.

Losing track of an EIN can stop work cold. You may need it to open payroll, file a return, send a W-9, update a bank account, or finish a state form. The snag is that many owners know they have one, yet can’t recall where it was stored.

The good news is that an employer identification number usually leaves a long paper trail. Once a business has used it for taxes, hiring, banking, or licensing, that nine-digit number tends to show up in more places than people expect. You do not need to guess, pay a lookup site, or file a brand-new application right away.

This article walks through the places most likely to have your EIN, what to try if you still can’t find it, and when you should ask the IRS for help. It also points out the common mistake that causes extra trouble: applying for a second EIN when the old one was already there.

Start With The Places You Already Control

Before you call anyone, search the records already tied to your business. That saves time and cuts the chance of reading the wrong number from a third-party file.

Check Your IRS Notice Or EIN Confirmation

The cleanest source is your original IRS confirmation notice. Many owners still call it the “EIN letter.” If you applied online, by fax, or by mail, the IRS sent a formal notice with the assigned number. If you keep tax papers in one folder each year, start there first.

Search old mail, scanned PDFs, cloud drives, and any bookkeeping folder your accountant uses. Try terms like “EIN,” “CP 575,” “IRS notice,” your legal business name, and your trade name. A lot of people save the document under the company name, not under “tax ID.”

Look At Prior Tax Returns

Your EIN should appear on federal business tax returns and many payroll forms. If you filed as a corporation, partnership, nonprofit, or estate, the number is usually near the top of the return. If you ran payroll, it should also appear on forms filed with the IRS and Social Security.

If you use tax software, open the prior-year file rather than just the PDF copy. The software record may include the number even if a printed copy is missing pages. If an accountant prepared the return, ask for the client copy from the last filed year.

Review Payroll And Hiring Records

Any business that has issued W-2s, filed quarterly payroll returns, or set up a payroll platform probably has the EIN stored in its payroll account. Check your payroll dashboard, employee setup area, year-end filing section, and employer profile.

Social Security wage filings also rely on the employer EIN. The Social Security Administration’s employer filing pages make clear that the EIN on W-2 reporting is the number used to post wage data, which is why old payroll records can be such a solid place to look.

Search Bank, Loan, And Merchant Account Files

Banks often collect an EIN when you open a business checking account, apply for a loan, add treasury services, or set up card processing. Your business account opening packet, loan application, and merchant processor profile may all show the number.

Don’t stop at the bank statement itself. Open the original account documents, signature cards, KYC forms, underwriting files, and any secure message archive inside online banking. These files often hold more detail than monthly statements.

Check State And Local Registration Packets

Your state may have asked for the EIN when you registered for payroll withholding, sales tax, workers’ compensation, or a local business license. If you have a state tax portal, sign in and review the registration summary. Many portals display the federal EIN in the account profile or registration history.

This route helps most when the business has been active for a while and the federal number has already been used across several agencies.

How To Find An Employer Identification Number In Existing Records

If you want the shortest path, work through the records in order of reliability. Start with the source that came from the IRS, then move outward to returns, payroll, and banking files. That makes it easier to trust the number once you spot it.

Use This Search Order

1. IRS EIN confirmation notice or later IRS correspondence
2. Federal business tax returns
3. Quarterly payroll filings and W-2 records
4. Business bank opening documents and loan files
5. Bookkeeping software, payroll software, and accountant copies
6. State tax registration records
7. Insurance, vendor onboarding, and licensing files

If you find two different numbers, stop and verify which one belongs to the entity in question. Mix-ups happen when an owner has more than one business, changed entity type, or kept both a sole proprietorship and an LLC running at the same time.

One clean way to reduce that risk is to match three items together: the legal business name, mailing address used at the time, and the tax form on which the number appears. If all three line up, you’re probably looking at the right EIN.

The IRS explains on its Employer identification number page that an EIN is the federal tax ID used to identify a business entity. That page is also a useful check against paid lookup services that promise special access. The IRS issues EINs for free.

That point matters because many owners panic, search the web, and land on a fee-based site. If your business already has an EIN, you usually do not need a paid service. You need your own records, or the IRS, or the professional who filed your returns.

Where To Look	What You May Find	Why It Works
IRS confirmation notice	Original assigned EIN	Direct source from the agency that issued it
Corporate or partnership tax return	EIN near the top of the return	Filed federal return tied to the entity
Form 941 records	Employer EIN on quarterly payroll filings	Used for payroll tax reporting
W-2 or W-3 files	Employer EIN used for wage reporting	Payroll systems keep it on file year after year
Business bank opening packet	Tax ID entered during onboarding	Most banks collect it for business accounts
Loan or credit application	EIN in underwriting documents	Lenders use it to identify the business
Accounting software	Company tax profile	Often copied from the return setup
Payroll platform profile	Employer tax ID in account settings	Needed to process tax filings and year-end forms
State tax registration	Federal EIN listed in registration details	States often ask for it during setup

What To Do If Your Business Has Employees

If you’ve hired staff, your odds of finding the EIN are even better. Payroll creates repeated touchpoints. The number appears on quarterly tax filings, year-end wage statements, payroll vendor records, and state withholding accounts.

Start with your last Form 941 filing, then move to W-2 and W-3 records. If you used an outside payroll company, log in to the employer portal and review the company profile or tax setup section. If you switched payroll providers, check both the current system and the one you left behind.

The Social Security Administration’s employer filing material states that the employer EIN used on W-2 reporting is the number used to post wage data. That is why old wage filing records often settle the issue when bank files or inbox searches come up empty. You can review the SSA’s employer filing instructions on Employer W-2 Filing Instructions & Information.

If a payroll provider entered the wrong number by mistake, compare it against your IRS notice or filed return before reusing it on a new form. One wrong digit can snowball into rejected filings and messy correction work.

When To Call The IRS

If your own records are dry and your accountant can’t find the file, call the IRS Business and Specialty Tax Line. The IRS can help locate a lost EIN for people who are authorized to receive it. That usually means the sole proprietor, partner, corporate officer, trustee, estate executor, or another person the IRS recognizes as the responsible party.

Before you call, have your legal business name, trade name, mailing address, and entity type ready. The IRS may ask questions to confirm your identity and link you to the account.

The IRS also states on its Get an employer identification number page that you never have to pay a fee to get an EIN directly from the agency. That page also helps if your search turns into a new application because the business never had an EIN at all.

Do Not Apply Again Too Soon

This is where many people get trapped. They can’t find the number, assume it’s gone, and apply for a new EIN. Then they end up with two numbers, mismatched filings, bank confusion, and old tax records under the first account.

Only file a new application when you’re sure the business never received one, or when the IRS rules say a new EIN is required due to a change in entity structure. A forgotten number and a new legal entity are not the same problem.

Know Who Can Receive The Number

The IRS will not hand an EIN to just anyone who calls. If you’re a bookkeeper, office manager, or family member helping out, you may need the owner or officer to handle the call. That can save a lot of back-and-forth.

Situation	Best Next Step	Common Trap
You have old tax returns	Check the top section of the latest filed return	Using a return from a different entity
You ran payroll before	Review Form 941, W-2, and payroll account settings	Pulling a number from the payroll provider’s own account
You opened a business bank account	Read the account opening packet or loan file	Looking only at monthly statements
Your accountant filed taxes	Ask for the client copy and setup details	Relying on memory instead of the filed record
You still cannot find it	Call the IRS as an authorized person	Applying for a second EIN too early

How To Find An Employer Identification Number Without Making A Mess

The smartest move is a controlled search, not a frantic one. Pick one business entity, one file set, and one year range at a time. That matters when an owner has more than one company, old dissolved entities, or a mix of DBA names.

Match The Number To The Exact Entity

An EIN belongs to a specific taxpayer. If you changed from a sole proprietorship to an LLC taxed as a corporation, the right number may depend on when that change happened and how the entity is treated for tax purposes. Your bank may still store the old sole proprietor file while payroll uses the newer company record.

To stay organized, write down the legal name, trade name, address, and tax year beside every number you find. That tiny bit of discipline can stop hours of cleanup later.

Use Your Business Formation File

If you used a lawyer, registered agent, formation service, or CPA when the business started, ask for the original formation packet. Those files often include the EIN notice or a tax organizer with the number typed into it. You do not need a fancy vendor. You need the person or service that handled the opening paperwork.

Check Insurance And Vendor Files

General liability policies, workers’ compensation applications, wholesale account forms, and supplier onboarding packets may all include the EIN. These are not your first stop, though they’re handy when tax records are boxed up or stuck with a former preparer.

If You Never Had An EIN In The First Place

Some business owners only need an EIN after the business grows, hires staff, opens a separate bank account, or changes tax treatment. If your search turns up nothing and you are sure the entity never received one, then the answer is not “find it.” The answer is “apply once, the right way, and keep the record where you can grab it later.”

Form SS-4 is the IRS application for an EIN, and the IRS instructions spell out who needs one and how to apply. Save the confirmation notice in three places: your tax folder, your cloud storage, and your password manager or secure admin vault. Future you will be glad you did.

Build A Simple Record Habit So You Don’t Hunt Again

Once you locate the number, don’t close the browser and move on. Save a clean copy of the source document. Then note where it lives. A one-minute filing habit beats a two-hour search every single year.

A Good Storage Setup

• Keep one PDF copy of the IRS notice in a “Tax ID” folder
• Store a second copy with annual tax returns
• Give your accountant and payroll admin the same verified number
• Label entities clearly if you run more than one business
• Update records when your address or responsible party changes

If you do that, the next time a bank, vendor, or payroll service asks for the EIN, you won’t be digging through inboxes, scanning old mail, or guessing which company file has the right number.

Most EIN searches come down to one simple truth: the number is usually not lost. It is buried in plain sight inside tax, payroll, bank, or registration records. Work from the most reliable source outward, verify the entity details, and call the IRS only after your own files have had a proper sweep.