How to Find an EIN for a Business | Records That Work

Start with old tax returns, bank records, licenses, or payroll forms; if it’s still missing, call the IRS business line.

An EIN is a business tax ID issued by the IRS. If you’re trying to track one down, the first thing to sort out is whose number you need. Your own business EIN is often sitting in paperwork you already have. Another company’s EIN is a different story. Many businesses don’t publish it at all, so the hunt depends on whether the business files public records.

That split matters because it saves time. If the EIN belongs to your company, you can usually pull it from tax forms, bank files, payroll records, or the original IRS notice. If the number belongs to a vendor, client, nonprofit, or public company, you may need to ask the business directly or pull it from a filing that’s open to the public.

What An EIN Can Tell You

An EIN works like a federal ID number for a business entity. Banks ask for it. Payroll systems ask for it. Tax returns, W-2s, 1099 forms, and many license applications use it too. That wide use is good news for you: the number often shows up in places owners already touch during normal operations.

Still, an EIN isn’t meant to be an open directory number. The IRS can confirm or reissue it only to people who are allowed to receive it. That means an owner, officer, partner, trustee, or someone with authority on file. If you’re trying to find an EIN for another business, privacy rules shape what you can and can’t pull.

Finding A Business EIN In Your Own Records

If the number belongs to your company, start with records that were created near the time the business opened. The oldest paperwork is often the cleanest. Newer files can work too, though older onboarding documents tend to have the full legal name and EIN together.

• IRS notice: Check the original EIN assignment notice or any later IRS letter tied to the business account.
• Past tax returns: Federal returns, payroll returns, and state filings often list the EIN near the top.
• Bank paperwork: Business account applications and loan files usually store the tax ID used at setup.
• Payroll records: W-2s, quarterly payroll returns, and payroll software dashboards often show it.
• Licenses and permits: City, county, and state applications may include the number.
• Old W-9s: If you gave one to a client, your EIN may be on the copy you kept.
• Bookkeeper files: Accounting software, scanned PDFs, and closing binders from formation work can be gold.

If you formed an LLC or corporation and handed the EIN to a bank, payroll provider, or tax preparer, that trail is usually enough. The IRS page on Employer identification number points to the same recovery trail: the original notice, past returns, bank records, licenses, and the IRS business line if the paper trail goes cold.

What Usually Turns Up First

Most owners find the number in one of three spots: a prior tax return, bank onboarding paperwork, or an old payroll form. Start there before you dig through every folder you own. A fifteen-minute pass through those files often beats an hour of random searching.

Record Source	What You’ll Usually See	Best Time To Check
IRS EIN notice	Exact legal name and the full EIN	First stop if you keep tax mail
Business tax return	EIN near the top of the return	Fast if you use a tax folder or portal
Payroll return	EIN used for wage reporting	Useful for employers with staff
W-2 or 1099 records	Employer or payer tax ID	Handy during year-end filing season
Business bank file	Tax ID entered at account opening	Good when tax papers are missing
License or permit file	EIN used on local or state forms	Good for regulated trades
Old W-9 copy	EIN shared with a client or payer	Useful for contractors and vendors
Accounting or formation binder	Formation records and tax setup notes	Good if you worked with a pro at launch

How To Find An EIN For A Business When The Number Isn’t Yours

This is where people lose time. There is no universal public EIN lookup for every private business. If the company is privately held, your cleanest move is often the plain one: ask the business for a W-9, invoice, onboarding packet, or tax form that lists the number. If you already have a business relationship, that step is normal.

Public records can help in a narrower set of cases. Public companies may show tax IDs in filings you can search through the SEC EDGAR Full Text Search. Nonprofits may show their EIN in filings and status records available through the IRS Tax Exempt Organization Search. Some state or local records may list a federal tax ID, though that varies a lot by filing type and office.

What usually won’t work? Calling a bank, payroll company, or tax office and asking them to hand over another business’s EIN. They won’t do it. Nor should they. Those files sit behind privacy and account-access rules.

Good Sources For Someone Else’s EIN

If you’re searching outside your own files, match the source to the type of business. A nonprofit has a better shot of being found in IRS records. A public company has a better shot in SEC filings. A local private company may only give it to you directly.

Business Type	Best Place To Start	What To Expect
Your own business	Past returns, bank file, payroll records	Highest chance of a same-day find
Public company	SEC filings	EIN may appear in public documents
Nonprofit	IRS exempt-organization records	EIN often appears in filings
Private vendor or client	Ask for a W-9 or invoice packet	Fastest clean route in many cases
State-licensed business	License or permit records	May work, though it varies by office

When The EIN Is Missing From Every File

If you’ve checked your own records and still come up empty, use the IRS route. The IRS says you can recover a missing EIN by checking the notice issued when you applied, calling your bank, checking licenses, or reviewing past returns. If that still fails, call the IRS business line. The same IRS page also points to EIN confirmation options such as an entity transcript or Letter 147C.

For business customers, the IRS business and specialty tax line is 800-829-4933. The IRS lists regular hours as Monday through Friday, 7 a.m. to 7 p.m. local time, with Alaska and Hawaii following Pacific time. Be ready to prove you’re allowed to receive the number. If your name isn’t tied to the entity, the call can stall out right there.

If Letter 147C Comes Up

Letter 147C is the IRS confirmation letter for an EIN that was already assigned. You may hear it mentioned when you call about a missing number. If the IRS can match your authority to the account, that letter can help you lock the EIN back into your records and stop the same scramble next tax season.

Have These Details Ready Before You Call

• Legal business name
• Trade name, if you use one
• Business address on file
• Your role with the entity
• Any old return, bank letter, or state filing that helps match the account

If the IRS can verify who you are, you may be given the number over the phone or directed to a confirmation letter. That’s the cleanest fix when records have gone missing after a move, a software switch, or a change in bookkeepers.

Common Mistakes That Slow The Search

A few wrong turns show up again and again:

• Applying for a new EIN too soon. One entity should have one EIN. A second number can create a filing mess.
• Paying a lookup site. The IRS says getting an EIN from the IRS is free. Third-party lookup pages often add little or nothing.
• Mixing up IDs. A state tax number, sales tax permit, DUNS number, or SSN is not the same thing.
• Using the wrong legal name. The EIN may sit under the full registered entity name, not the name on the storefront.
• Assuming every EIN is public. Many are not, and no search trick changes that.

The cleanest play is to start narrow, then widen the search. Check records you control. Ask the business directly if it isn’t yours. Use public filings only when the business type makes that route sensible. That order keeps the search short and cuts out dead ends.