How to Look Up Your US LLC's EIN

The IRS issues an Employer Identification Number once per entity and it never expires, yet a surprising share of founders lose track of theirs within the first year. An EIN lookup is rarely hard, but it goes wrong in predictable ways: people call the wrong line, paste the number into the wrong form, or assume a third party can read it back when only the IRS can. This guide covers how to find your US LLC's EIN safely, and the mistakes that turn a five-minute task into a multi-week delay.

Where is my LLC's EIN already written down?

Your LLC's EIN is almost always recorded somewhere you already have access to, so an EIN lookup usually starts with your own paperwork rather than a phone call. The single most authoritative copy is the CP 575 notice, the confirmation letter the IRS sends when the number is first assigned. If you filed by fax, the IRS faxes back a confirmation showing the assigned EIN, and that page is just as valid as the mailed CP 575.

Before you contact anyone, check these places in order:

One common mistake here is confusing the EIN with a state filing number or a registered agent reference. The EIN is a nine-digit federal number formatted as two digits, a hyphen, then seven digits. If the number you found is formatted differently, it is probably not your EIN.

How do I do an EIN lookup if I have lost the paperwork?

If you have lost every copy, the surest EIN lookup for a private LLC is to call the IRS Business and Specialty Tax Line and ask them to read the number back to an authorized person. The IRS verifies your identity first, which is why this only works for someone tied to the entity, such as an owner, a partner, or a corporate officer of record.

To make that call go smoothly, have the following ready before you dial:

  1. The exact legal name of the LLC as it was filed, including spelling and any commas.
  2. The business mailing address the IRS has on file.
  3. The name of the person listed as the responsible party on the original SS-4.
  4. Any tax document or filing reference you can read out to confirm the entity.

The big mistake non-resident founders make is assuming this is a fast call from outside the US. The line keeps US business hours, callers without a US number may face long international hold times, and the IRS will not hand the EIN to anyone it cannot tie to the entity. A single mismatch on the legal name can end the call without an answer, so call inside IRS hours with your details exact.

Can I look up another company's EIN, or only my own?

You can sometimes find another company's EIN, but only when that company has made it public, and a private LLC's EIN is not in any free government directory you can search by name. Public companies that file with the SEC disclose their EIN inside filings, and registered nonprofits expose theirs through IRS tax-exempt organization records. A privately held US LLC has none of those disclosure requirements.

This is the mistake that wastes the most time: founders search for a magic "free EIN lookup tool" expecting a national registry of every business number. No such public search exists for private LLCs. An EIN legitimately appears only in SEC filings for public companies, IRS records for tax-exempt organizations, and documents the business itself shared with you, such as a W-9 a vendor sent. Sites promising instant lookups of any private company's EIN are usually scraping or guessing, so do not trust or pay them.

Why does the wrong EIN cause bank and tax problems?

An incorrect EIN, or one that does not match the legal name the IRS holds, causes problems because banks and the IRS both run an automated name-and-number match. When a US bank opens a business account, it checks the EIN against IRS records, and a mismatch can freeze the application or trigger backup withholding later. The fix is to use the EIN exactly as the IRS assigned it, paired with the exact legal name on the SS-4.

Three avoidable mistakes account for most of this:

Consider a founder in Madrid who set up a Wyoming LLC and typed her EIN from memory into a payment processor's onboarding form. One digit was off, verification failed, and the account sat in review for days. A two-minute check against her CP 575, with a human confirming the digits out loud, would have prevented the stall.

How do I get an EIN without an SSN, and recover it later?

Getting an EIN without an SSN is possible for non-resident founders, and the cleanest way to keep an EIN lookup easy later is to store the original confirmation the day it arrives. The EIN itself is free from the IRS; you only ever pay to prepare and file the application, never for the number. Because non-resident founders cannot use the IRS online tool, the application goes in on Form SS-4 by fax or mail, the IRS controls the timing, and no provider can promise a specific date.

Having one party handle both the entity and the EIN reduces the chance of losing track of either. CORPBOLT is a U.S. business formation service for non-resident founders that sets up a US (Wyoming) LLC entirely remotely, with no SSN required. Plans start from $349/year, with the EIN included from $599. (corpbolt.com)

Setting up the Wyoming LLC, the EIN, a registered agent, and a US business address through one service means the confirmation documents live in one place, so a future EIN lookup is a matter of opening your file rather than calling the IRS.

What is the safe order of steps for an EIN lookup?

The safe order for an EIN lookup is to exhaust your own records first, then go to the IRS directly, and never pay a third party to "find" a number you alone are entitled to retrieve for free. This keeps your federal tax ID out of the hands of services that have no legitimate way to access it.

  1. Search your own files: CP 575 or fax confirmation, prior tax returns, bank and processor records.
  2. Check any document where you previously wrote the EIN, such as a W-9 you issued.
  3. If still missing, call the IRS Business and Specialty Tax Line as an authorized person, with the legal name and address exact.
  4. For a public company or nonprofit, use SEC filings or IRS tax-exempt records instead.
  5. Once recovered, store the confirmation in one durable place so the next lookup takes seconds.

Frequently asked questions

Is there a free EIN lookup for any private US LLC?

No. There is no free public directory that lets you search a private US LLC's EIN by name. The number is available through your own records, or through the IRS to an authorized person tied to the entity. Free lookups only exist for public companies via SEC filings and tax-exempt organizations via IRS records.

Does an EIN ever expire or need renewing?

An EIN does not expire and is never reissued or renewed. The IRS assigns it once to an entity and it stays valid for the life of that entity. If you think you "lost" it, the number still exists; you are recovering it, not reapplying.

Can a non-resident founder get an EIN without an SSN?

Yes. A non-resident founder with no SSN applies on Form SS-4 and files it by fax or mail rather than through the IRS online tool. The EIN is free, and the IRS controls the timing, so no provider can promise a specific date.

What if my EIN and legal name do not match at the bank?

A mismatch usually means a typo in the EIN or the wrong legal name, not a real problem with the number. Pull your CP 575, confirm the nine digits and the exact legal entity name, and give the bank both as the IRS recorded them. Correcting the entry almost always clears the match.

Can CORPBOLT just tell me my EIN?

If CORPBOLT handled your formation and EIN filing, the confirmation lives in your records from that process, so you retrieve it from your own file. CORPBOLT prepares and files the application; the EIN is issued by the IRS, and only the IRS can confirm it to an authorized person.