What Is an ITIN? (And Whether You Actually Need One)

The ITIN is one of the most over-requested numbers in the whole non-resident founder toolkit. It is one of the most common mix-ups founders bring to us: they are convinced they need an ITIN before they can register a company or get a tax ID for it. Almost every time, the honest answer is that they do not. Part of the trouble is the name. "Taxpayer identification number" sounds like the thing every business must have, when it is really a personal number for a narrow situation. This page is the plain version of what the IRS actually says an ITIN is, what it is firmly not, and where it sits next to the EIN your company genuinely does use. If your real question is whether your own situation requires one, that decision lives in our guide to whether you need an ITIN; here we define the thing itself.

An ITIN is a tax-processing number the IRS issues to an individual who needs a US taxpayer identification number but cannot get a Social Security Number. The IRS defines it as a nine-digit number issued "for federal tax purposes only," and issues it regardless of immigration status, because plenty of people who are not eligible for an SSN still have a US tax filing to make. It is always nine digits, it begins with a 9 and is formatted like a Social Security Number, as NNN-NN-NNNN, which is exactly why it gets confused for one.

That format is the whole source of the confusion. An ITIN looks like an SSN, so people assume it carries the same weight. It does not. It is a number whose only function is to let a tax return or a withholding document be matched to a specific person the IRS would otherwise have no way to identify.

An ITIN exists so the IRS can process federal tax tied to an individual who has no SSN. That is the entire purpose. In practice that covers a short list of situations: filing a US individual tax return you are required to file, claiming a reduced rate under a tax treaty between your country and the US, or being listed on someone else's US return. Every one of them is a tax reason, and none of them is starting or running a company. The more important half, and the half that saves founders the most wasted effort, is the list of things an ITIN deliberately does not do. In the IRS's own words, an ITIN does not authorize you to work in the US, does not provide or change immigration status, and does not qualify you for Social Security benefits or the Earned Income Tax Credit. Tax Topic 857 adds that an ITIN "creates no inference concerning your immigration status or your right to work in the United States."

The fastest way to place an ITIN is against the two numbers it gets mistaken for. The IRS issues every one of these except the SSN, which comes from the Social Security Administration.

The IRS draws this line cleanly. Its guidance for international taxpayers states that an individual who is not eligible for an SSN applies for an ITIN on Form W-7. But "any person other than an individual," and any individual acting as an employer or running a US trade or business as a sole proprietor, must instead have an EIN. Your LLC falls on the EIN side of that line. For the full side-by-side, including where a generic "tax ID" fits, see EIN vs ITIN vs SSN vs Tax ID.

Here is the part that matters most for a founder forming a US company from abroad. Your company is identified to the IRS and to banks by its EIN, not by any number attached to you personally. When you apply for that EIN on Form SS-4, a foreign responsible party with no SSN or ITIN simply writes "Foreign" in the tax-ID box, and the application still goes through. The whole point of that rule is that the company's number does not wait on you having a personal one. The mechanics of doing exactly that are in our guide to getting an EIN without an SSN.

So forming the LLC, obtaining its EIN, and starting the bank-account process are all things you do without an ITIN. An ITIN only enters the picture when a US tax rule lands on you as an individual, separately from the company. Whether that applies to you is a personal-circumstances question, and it is the one our guide to whether you need an ITIN is built to answer.

When a US tax obligation does fall on you personally, and you have no SSN, the ITIN is how the IRS identifies you on that filing. You apply for it on Form W-7, and the IRS generally expects it to come attached to the federal tax return that creates the requirement, unless you meet a specific exception. We keep the detail of that process on its own page on purpose, so this one stays a definition; the actual how-to-apply steps and the question of whether your situation qualifies are covered separately. The point to take from here is simply that an ITIN is purpose-driven: no qualifying federal tax purpose, no ITIN.

An ITIN is not necessarily permanent, which is a detail most definitions skip. Under a 2015 law, an ITIN expires if it is not used on a US federal tax return for three consecutive years. An older group of ITINs issued before 2013 was retired on a staggered schedule that has since finished, and the IRS ITIN page carries the current rules. In practice this is narrow: it matters only once you actually hold an ITIN and are about to file. If you are not required to file, there is nothing to renew; if you are, you renew before that filing, using the same Form W-7 marked as a renewal, with no tax return attached. The step-by-step of applying or renewing is a separate process from what the number is, so we keep it off this definition.

Almost every ITIN question we field is really one of these four misunderstandings:

• "I need an ITIN to start my US company." You do not. Formation and the company's EIN run without it.

• "An ITIN is my business's tax number." No. The business uses an EIN. An ITIN is a personal number that never identifies a company.

• "An ITIN lets me work in the US or affects my visa." It does neither. The IRS is explicit that an ITIN carries no work authorization and no immigration effect.

• "I can get one now, just in case." You cannot. Without a qualifying federal tax purpose, the application is turned down.

What is an ITIN in simple terms?

It is a nine-digit IRS number for an individual who has to deal with US federal tax but cannot get a Social Security Number. It identifies a person on a tax filing and does nothing else; it is not a business number and not a work or immigration document.

What does an ITIN look like?

It is nine digits, begins with the number 9, and is formatted like a Social Security Number, as NNN-NN-NNNN. That resemblance is why ITINs and SSNs are so often confused, even though they do very different jobs.

Do I need an ITIN to form a US LLC or get its EIN?

No. Forming the LLC and getting its EIN do not require you to have an ITIN. The company runs on its EIN, and a foreign applicant can request that EIN by writing "Foreign" in place of a personal tax ID on Form SS-4.

Is an ITIN the same as an EIN?

No. An ITIN identifies an individual; an EIN identifies a business. Your LLC needs an EIN, while an ITIN would only ever be for you personally. The full comparison is in EIN vs ITIN vs SSN vs Tax ID.

Does an ITIN let me work in the US or change my immigration status?

No. The IRS states plainly that an ITIN does not authorize work in the US, does not provide or change immigration status, and does not qualify you for Social Security benefits or the Earned Income Tax Credit. It is strictly a tax-processing number.

Can I get an ITIN without a US tax reason?

Generally no. The IRS issues an ITIN only when you have a qualifying federal tax purpose, usually a return you must file, with a narrow set of exceptions. You cannot obtain one simply to form a company or open an account.

CORPBOLT prepared this explainer for non-US founders trying to work out where the ITIN fits, if at all. The definition and nine-digit format, the rule that an ITIN is for federal tax purposes only, the explicit list of what it does not do, and the EIN-for-the-business versus ITIN-for-the-individual split are taken directly from the IRS pages on the ITIN, on Taxpayer Identification Numbers, on Tax Topic 857, and on the US taxpayer identification number requirement for international taxpayers, all linked below, and reflect Form W-7 as revised December 2024. The recurring real-world pattern we add from forming LLCs for founders abroad is the one this page leads with: the ITIN is asked about far more often than it is actually needed. Whether you personally need one depends on your own tax situation, and this is general information, not legal or tax advice. CORPBOLT is a formation service, not a law firm or tax advisor. Last reviewed June 2026.

Tax IDs with CORPBOLT: CORPBOLT forms your Wyoming LLC with a registered agent and US business address from $349/year (Foundation) and prepares the company's EIN application, which needs no ITIN; the EIN is included from $599/year (Launch) or as a $199 add-on. The IRS never charges for the EIN. Form your Wyoming LLC →

• IRS: Individual Taxpayer Identification Number (ITIN)

• IRS: Taxpayer Identification Numbers (TIN)

• IRS: Tax Topic 857 - Individual Taxpayer Identification Number (ITIN)

• IRS: US Taxpayer Identification Number Requirement (international taxpayers)

• IRS: About Form W-7 (Application for ITIN)

Approval note: Eligibility and approval decisions are made by each bank, fintech, and payment processor. Requirements can vary by provider, country, business model, and account history.