How to find my LLC EIN number: the ranking changed when the IRS added a route

I had it wrong at the top of this file for three weeks. It has carried the same ranking since the fourteenth of July: five routes back to a lost EIN, ordered by how long each one took, with a telephone call in first place. The IRS page on employer identification numbers, as it stood on the seventeenth of July 2026, lists a route the earlier version of this piece did not contain, and for anyone eligible to use it the telephone call I put first is no longer the fastest way through.

This is the corrected version and the correction goes first. Eligible users of the IRS Business Tax Account can now download a digital CP575, and the agency's own wording is that it "can be used as a substitute for the original CP575A-J notice series and Letter 147C, EIN Previously Assigned". That is the document banks and payment processors ask for. It is a download rather than a queue on a line that opens for twelve hours a day, and I did not know it existed when I built the ranking. I had assumed the agency would announce a new verification route somewhere I would see it. I went looking for it only because a reader asked why the IRS page no longer matched what this site said, which is the worst way to find out that your own ranking has gone stale.

What people actually lose

The distinction that decides everything here is between 9 digits and 1 document.

Nine digits are easy to store and easy to recover. The confirmation document is neither, and I spent the best part of an afternoon working out that the two failures look identical from the outside and have nothing in common underneath. The IRS issues CP 575 once, at assignment, and does not reissue it. A founder who has the digits in a password manager and nothing else will still fail an onboarding check at a bank or a processor, because the requirement is a document from the agency rather than a string of characters typed into a field.

That is why how to find my LLC EIN number is the wrong search. The number is rarely the missing item, and the evidence for it almost always is.

The routes, in the order the agency lists them

Before it suggests contacting anybody the agency sets out four places to look, and the wording matters because three of the four are other people's records rather than yours:

"Look for it on the notice we issued when you applied for an EIN. Contact the bank that has your business account. Check with agencies where you've applied for state or local licenses. Look on past business tax returns."

Four places, and each is worth roughly twenty minutes of the two hours I would budget for the whole exercise. Any federal return the entity has filed carries the number at the top, and the entity has filed at least one for every year since assignment, so the search space is small and dated. Every 1099 issued carries it, and every W-2 if payroll has ever run. A bank will read it back once it has verified the caller, because the number was collected at account opening and sits in the customer record. State registrations carry it, particularly sales tax and employer withholding accounts. Loan files, insurance policies written in the company name, and the onboarding pack at whichever processor was set up first all carry it as well.

Two places that are underweighted in most guides. The first is old email, because an online application returned a PDF and that PDF is sitting in whatever inbox existed at the time, under a subject line nobody thinks to search. The second is the formation agent who filed on the applicant's behalf, in which case the confirmation frequently landed in the agent's system and never in the client's at all. A support ticket to an agent who has not been paid for 2 years still tends to get answered, usually inside 1 working day, because the record costs them nothing to look up.

The four artefacts, and which one an institution will take

Four artefacts are in circulation, they are not interchangeable, and an onboarding team will usually name only one of them.

CP 575 is the original notice, issued once at assignment, and the agency does not print a second one. Two founders in three, in my own unscientific count of the questions I get, are looking for a reissue of that 1 document, and no reissue exists at any price.

Letter 147C, which the agency titles EIN Previously Assigned, confirms the same number and is available by telephone. Banks and processors treat it as equivalent for verification purposes, and in three years of watching onboarding queues I have never seen an institution accept the number without one of these four documents behind it, which is the single fact that makes this whole exercise unavoidable rather than merely annoying. It is requested on the business and specialty tax line.

The digital CP575 inside Business Tax Account is the addition described above, and it is the only one of the four that arrives without a human being in the loop. The agency states directly that it substitutes for both of the others, which collapses a 12 hour telephone window into a download.

An entity transcript is the fourth artefact, obtained through the business tax transcript service. It carries the number inside the entity's filing record rather than as a standalone verification, which makes it the weakest of the 4 for onboarding and the strongest of the 4 for an accountant reconstructing a history.

The four artefacts, as described on the IRS employer identification number page on 17 July 2026. The duration chart that used to sit here has been removed: its ranking no longer holds and no published service standard for Letter 147C could be found.

Timing, and the part that is hard to compare

The domestic line is 800-829-4933, with 800-829-4059 for TTY. Hours run Monday to Friday, 7 in the morning to 7 in the evening, and the agency measures that in the caller's own local time rather than its own, with one carve out: "Residents of Alaska and Hawaii should follow Pacific time". Twelve hours a day, sixty a week. On the call itself the agency states that "We'll verify your identity and provide the number over the phone if you're authorized to receive it", which is the entire mechanism in one sentence and the reason there is no lookup page anywhere.

For an applicant whose principal place of business sits outside the United States the number is 267-941-1099 and the window runs from 6 in the morning to 11 at night Eastern time, Monday to Friday. That is seventeen hours against twelve, and the line is not toll free. The international window is five hours wider than the domestic one, which is the opposite of what almost everybody assumes, and for a caller in Lisbon or Warsaw it converts an impossible call into an ordinary one: 11 at night Eastern is 4 in the morning in Lisbon, but 6 in the morning Eastern is 11 in the morning there.

Written applications from outside the country go on Form SS-4 to Internal Revenue Service, Attn: EIN International Operation, Cincinnati, OH 45999. One address, one form, no online equivalent for this population.

I cannot tell you how long Letter 147C takes to arrive once requested, and I have now tried on 2 separate days. I could not find a published service standard for it anywhere across the 9 agency pages I read, and I spent 40 minutes on it. The guides quote anything between 4 business days and 4 weeks, I read 6 of them, and not one cites a source. Four days and 20 days are not the same answer to a question about whether you will make a funding deadline. That is a guess dressed as a fact, and I would rather leave a hole in the table.

A note on why this catches founders from outside the United States

The equivalent identifier in most other systems is public, and that shapes the expectation people arrive with.

A company number in the United Kingdom sits on a free register, with the filed accounts, the registered office, the officer history and the charges attached to it, and any counterparty anywhere in the world can pull all of that in about 30 seconds without asking the company for permission or even telling it that the search happened. A VAT number anywhere in the 27 member states can be validated in a browser in about 4 seconds. Both are free, and neither involves a telephone call to anybody. Founders formed in those environments assume the American number behaves the same way. It is a reasonable assumption and it is wrong in every particular. It does not, because the EIN is treated as confidential taxpayer information and the agency will only release it to a person it can verify as authorised.

The practical consequence is procedural rather than philosophical. There is no public lookup of any kind. There is an identity check, and that check is where all 12 hours of the daily window and every day of the wait actually live.

A short aside, because it changes what you should ask for. Every verification in the American arrangement runs through the entity itself. That is why an onboarding team asks you for the letter rather than looking anything up, and why a bank that has already seen your CP 575 will still ask for it again at the next institution. The document is the register. Anyway, back to the recovery.

What to do with a number you have but cannot evidence

This is the position most people are actually in, and it has a short answer.

Request Letter 147C, or download the digital CP575 if the account is eligible, and do it before the application that needs it rather than during it. The cost of doing it early is one telephone call inside a 12 hour window, or 2 minutes in a browser, against a stalled onboarding that has already taken 3 weeks of somebody's attention and is about to take 3 more while the file sits in a queue behind everything that arrived while it was incomplete. An onboarding review that pauses for missing evidence does not resume the moment the evidence arrives, because it goes back into a queue, and the queue is longer than the document request.

The second habit is duller and matters more. Store the document, not the digits. Two copies of one PDF, in two places, one of them not on the same machine, costs nothing and removes this entire category of problem. I have watched three separate recoveries that a 40 kilobyte file would have made unnecessary.

One more rule belongs here while the file is open. The IRS states that a business does not need a new EIN to "change your business name, address or responsible party". Founders apply for a second number after a change of control more often than you would expect, and a duplicate creates a filing problem that takes longer to unwind than the original recovery. Where two numbers already exist the instruction is explicit: "If you have more than one EIN and aren't sure which to use, call the Business and Specialty Tax Line at 800-829-4933 and we'll tell you which number to use".

What I could not establish

I could not determine how many entities are eligible for Business Tax Account, and that is the pivot on which the new first place turns. Eligibility is described in general terms and the population is not published anywhere I could find. The difference between 5 per cent of entities and 80 per cent of them decides whether the ranking above is useful or decorative, and I do not know which end of that range we are at. My guess is that a single member LLC with a sole proprietor responsible party sits inside it and a multi member entity with a foreign responsible party sits outside, but that is inference from the way the service is described rather than anything the agency has stated, and I would not defend it in front of somebody who had checked.

I also could not find a published processing standard for Letter 147C, as noted above.

Nor could I establish when the digital CP575 was introduced. The page carries a review date of the seventeenth of July 2026 and no change log at all. That is the same problem I hit with a state fee schedule two days ago, where two of three government pages carried a figure that had changed on the first of January, so it reads as a general condition of government publishing rather than a fault of one agency.

The part that has not resolved

The original ranking in this file was not careless. It was researched, it was correct when it was written, and it went out of date because an agency added a service and did not announce it anywhere I was watching.

I have not worked out how to monitor for that across 8 pages. Checking the same 8 pages every week is achievable and mostly wasted, because 7 of the 8 will not have moved in any given week. Not checking them produces exactly what happened here, which is a ranked list carrying the wrong item in first place for three weeks, in a file whose entire claim is that the ranking is measured. It is a small thing and I keep thinking about it more than is reasonable, because the file's entire claim is that the ordering was measured rather than assumed.