ITIN vs SSN vs EIN: I read 163 federal complaints and the real problem is not the bank

Someone posted a rejection screenshot in a Slack group I read, and 4 people answered it inside 20 minutes. The bank had written that the tax number supplied did not match the entity type. Four people replied with 4 explanations, 3 of them were wrong, and one of those 3 was the answer I had it wrong about myself a year ago and had given in writing.

Do not pay anybody for the EIN step. Never file the entity name from memory. Those 2 rules would have prevented most of what follows, and here is the flat version, because the confusion is not really about tax law. It is about three agencies issuing three nine digit numbers that everyone calls a tax ID.

A Social Security number belongs to a person. It comes from the Social Security Administration and from nobody else. An ITIN belongs to a person and comes from the IRS. It exists because some people have a United States filing obligation and cannot get an SSN. An EIN belongs to an entity, also from the IRS. It identifies a business rather than a human being.

Do not start with ITIN vs SSN. Almost everybody does, and it is the wrong place to start, because for a company the third number is the one that matters. The federal complaint file agrees, for what it is worth: of 163 complaints mentioning an ITIN between July 2024 and July 2026, only 10 are about opening an account at all, while 82 sit in credit reporting. But take them in order.

What I had wrong

Several things, and I am setting them out because I suspect they are common.

I thought an ITIN was a lesser Social Security number that would eventually build a credit file, and the complaint record is blunt about how that ends: 3 of the 4 companies most named in that file are credit bureaus, with TransUnion at 24, Experian at 22 and Equifax at 20 out of 163. It does not build one. Some lenders do underwrite against an ITIN. The market is smaller and the pricing is worse. It is not the same system wearing different letters.

I thought a single member LLC with no employees did not need an EIN, because the tax code says the owner's number can be used. That is true and also almost irrelevant. Try opening a business account that way and see how far you get. Every institution I have looked at asks for an EIN, marketplaces ask, processors ask, and the fact that filing does not compel it stops mattering the moment you want to receive money in the company's name.

And I thought the word Employer in Employer Identification Number meant something, which it has not since the 1970s. The word is historical and nothing more. The number is used as a general entity identifier far more often than it is used for payroll, which is why an LLC with no employees still needs one.

The order things actually happen in

The entity comes first. You file with a state and the certificate comes back. Until that exists there is nothing for the IRS to number. The EIN comes next, and it is the number the banks actually want. The ITIN comes last, and only if your own tax position requires one at all.

That last ordering saves people months and almost nobody gets told it. The belief that you need an ITIN before you can get an EIN is wrong, and acting on it adds a seven week wait to a chain that never required one. On the SS-4 there is a box for the responsible party's own taxpayer number, and a foreign responsible party without one writes the word Foreign in it and carries on.

How long, and why the honest answer is a range

With an SSN or ITIN already in hand, the online EIN application returns the number in the same session and you can save the confirmation before closing the tab. The application itself is free. Anything charging you for that step is charging you for form filling.

Without one the online route is shut. You are on paper. Form SS-4, by fax or post, with the IRS publishing something around four weeks for fax and longer for post, plus an international telephone line where the application can be completed on the call.

I would quote the published figures exactly rather than paraphrase them, because the 2 agencies phrase their waits very differently and I got that difference wrong for a year. For an ITIN the IRS says to "allow 7 weeks for us to notify you about your ITIN application status", and adds that "it can take 9-11 weeks if it's tax season (January 15 to April 30) or if you applied from overseas". Both of those conditions describe most foreign founders, and they stack rather than compete. Seven weeks is 49 days and eleven weeks is 77. The declared season covers 106 days of the year, which is 29 per cent of the calendar, before you add the overseas condition that applies to you in all 12 months.

For the EIN itself the international telephone line is 267-941-1099 and runs from 6 in the morning to 11 at night Eastern time, Monday to Friday, which is 17 hours a day against the 12 the domestic line offers. Written applications go on Form SS-4 to Internal Revenue Service, Attn: EIN International Operation, Cincinnati, OH 45999. What I cannot give you is a published service standard for the paper route. I went looking for one across 9 agency pages and 2 afternoons before giving up.

My guess, and I want it read as a guess, is that the paper route is not 1 queue but several, because an application that arrives complete and legible on a form where every box matches the state record is a different job from one that needs a person to resolve a discrepancy, and nothing in the published guidance distinguishes between the two. That is a guess with nothing behind it except the shape of the work, and I would drop it immediately if the agency published anything.

An aside about the paperwork industry

I got mildly annoyed writing the paragraph above about free applications, and it is worth explaining why rather than pretending to be neutral about it.

Take a formation package advertised at 349 dollars, suppose the state filing fee inside it is 90, and suppose the registered agent is quoted separately at 119 a year, which is roughly where the middle of this market sits. That leaves 259 dollars for a step the IRS performs in 1 online session at a price of 0, and I have never seen a package itemise that 259 anywhere on the invoice, which after a while stops looking like an oversight in invoice design and starts looking like the product.

Some of what these companies sell is worth paying for. A registered agent in a state where you do not live is a real service, with a real recurring cost, and I would pay it without complaining. The paperwork on a foreign owned entity is fiddly enough that outsourcing it is a reasonable decision, and I would not tell anybody not to.

What I object to, and I do object rather than merely observe, is the free step being bundled into the price and described as included. Included in the way tap water is included with a restaurant meal: a word on the page, a cost somewhere else. The confusion between three nine digit numbers is not an accident that the market is working to clear up. It is the gap the packages are priced into, and every company selling one has an interest in you continuing to find this difficult.

Anyway, back to the numbers themselves.

The ITIN, when you do need it

It opens 1 door and that door is tax. You file with it, you claim treaty benefits with it where a treaty applies, and you stop being a gap in the IRS's records. It does not authorise work. It is not general identity documentation either.

Getting one means proving who you are. That is the awkward part, not the form. A passport alone satisfies it, which is the same document that satisfies the bank identification rule in 31 CFR 1020.220, and the overlap is worth knowing because it means 1 certified copy can do 2 jobs. Without one you are into combinations of two documents from an approved list, and the combinations have rules, so read the list before you start rather than after.

Now the question of originals. The IRS does return them by post, internationally, after processing. Being without a passport for 2 months is not workable for most people. A Certifying Acceptance Agent verifies your documents so the originals never leave your hands, and charges for it, and everyone I know who has faced the choice has paid and thought it obvious.

One thing that catches people years later: an ITIN unused on a federal return for three consecutive years lapses, silently, and the discovery usually happens in April with a deadline attached.

What each number actually unlocks

Keeping them straight gets easier if you stop thinking about what they are and think about what door each one opens, because the doors barely overlap.

The SSN is the only one of the 3 attached to work authorisation and to the domestic credit system. It is what a lender wants, what an employer needs before payroll, and what builds a credit file.

The ITIN opens the tax door and nothing else, as above.

The EIN opens the business doors and I count more of them every time I look: bank onboarding, marketplace seller accounts, payment processors, state registrations, contractor paperwork, insurance. Nearly everything in the daily running of a company that asks for a tax number is asking for this one. That is the whole hierarchy in a sentence.

Which produces a corollary I have now had to state 3 times this year, and I suspect I will state it again before Christmas. An EIN gives you no liability protection whatsoever, and the IRS is clear that you do not even need a new one to "change your business name, address or responsible party". It is an identifier and nothing else. If somebody has told you that getting one puts a wall between the business and your personal assets, they have merged two unrelated things, and the actual wall comes from the entity and from how carefully you keep it separate from yourself.

You can also have one without an LLC, and I say so because the question arrives about once a fortnight. A sole trader can hold one. So can a partnership that never registered anywhere, an estate, a trust. The number identifies a tax filer. It does not identify a limited liability company.

There is a route printed on the form itself that I had been describing as unavailable, and I was wrong about that too. The SS-4 has a box for a third party designee: a named person who may receive the number on your behalf. An accountant who is already preparing your return can be named there, has a United States telephone line and a domestic time zone, and can complete the application on the call that is impossible for you at 4 in the morning.

That route is open to anybody who already has a United States accountant. It is printed on the form. I have never once seen it mentioned in a guide.

The two that catch everybody

Whatever legal name you file with the state becomes the name every later record has to match, character for character, suffix included. LLC against L.L.C., against the words Limited Liability Company written out in full, and a bank comparing 2 documents does not know that those are the same company. People file one version and type a tidier one on the tax application and then spend a year explaining to banks why two documents disagree. That screenshot at the top of this article was almost certainly one of these.

And none of this is advice on your own filing position, which may turn on a treaty, on how many members the LLC has, or on an election you have not made yet. A single member LLC owned by a non resident carries an information return obligation that surprises somebody every spring. That belongs with a CPA or an enrolled agent who works with foreign owned entities, and I do not know your position.

The thing I have tried twice and failed to establish is how often first attempts are rejected and why. The IRS does not publish it anywhere I can find. I cannot tell you what the rejection rate is, I cannot tell you whether it differs between the fax route and the telephone route, and I am not going to estimate it from the handful of cases that reach me, because a handful of cases that reach a website is the most biased sample in existence.