ITIN for non-residents: do you need one for your LLC?

It's one of the questions that confuses non-residents with an LLC the most: do I need an ITIN to open or run my company? The short answer, for most digital operators with a single-member LLC, is no. But there are specific cases where you do need one, and mixing them up costs weeks of paperwork and IRS rejections.

Let's separate myth from reality: what the ITIN is, when you actually need it, when it's a waste of time, and how to apply for it if you fall into one of the real cases.

What the ITIN is (and what it isn't)

The ITIN (Individual Taxpayer Identification Number) is a tax number the IRS issues to individuals who have a US tax obligation but cannot get a Social Security Number (SSN). It starts with the digit 9 and uses the same format as an SSN (9XX-XX-XXXX).

The key word is individual: the ITIN identifies a person, not a company. Your LLC already has its own tax ID — the EIN. If you're not yet clear on that one, first review what the EIN is and how to get it, because the confusion between the two is exactly what triggers most of the mistakes.

The three numbers people mix up

• EIN: tax ID for the COMPANY (your LLC). You need it no matter what to operate.
• ITIN: tax ID for a non-resident INDIVIDUAL who has something to report in the US.
• SSN: Social Security Number, only for US citizens and residents.

The typical mistake: believing you need an ITIN to form the LLC or to get the EIN. That's not the case. The SS-4 form to apply for a non-resident's EIN is filled in by leaving the SSN/ITIN box blank and writing "Foreign" on line 7a. You don't need an ITIN beforehand for any of it.

When you do NOT need an ITIN

The most common case at Devil Club: a non-resident single-member LLC selling services (software, consulting, e-commerce, marketing) with no physical presence or employees in the US.

In that scenario, your LLC is a disregarded entity that only files an informational return — the pro-forma Form 1120 + 5472 — and you, as a person, have no personal income tax return in the US. If there's no effectively connected income (ECI) and no 1040-NR to file, there's nothing to attach to an ITIN. The LLC's EIN covers everything: bank, Stripe, contracts, filing.

Rule of thumb: if your only relationship with the IRS is your LLC's informational 5472, you don't need an ITIN. The number that matters is the company's EIN.

In practice you also don't need one to open an account at Mercury, Wise or Relay: those banks identify the LLC by its EIN and you by your passport, not by an ITIN.

When you DO need an ITIN

There are specific situations where the ITIN stops being optional:

1. You have to file a personal return (1040-NR)

If you generate US-source income effectively connected with a US business (for example, physical presence, dependents or certain US-source income), you'll have to file a 1040-NR as an individual. That return needs an ITIN.

2. You sell US real estate (FIRPTA)

If your structure holds real property, FIRPTA withholding kicks in on the sale, and as a foreign seller you need an ITIN to file the 1040-NR and recover what was withheld. We cover this in the guide to your LLC buying US real estate.

3. You want to claim tax treaty benefits

To reduce withholding on certain US-source income via a W-8BEN backed by a double-taxation treaty, the withholding agent may require an ITIN to support the form.

4. Your LLC is multi-member (taxed as a partnership)

If the LLC has more than one member, it files a Form 1065 and issues a K-1 to each member. Non-resident members usually need an ITIN so those K-1s and the associated withholding can be attributed to them correctly.

How to apply: Form W-7

The ITIN is requested with Form W-7, and it's almost never filed on its own: it goes with the document that justifies why you need it (usually the tax return it's attached to, or an exception document).

You need to prove identity and foreign status. The star document is your passport: on its own it covers both requirements. You have three routes to submit it:

• By mail to the IRS with your original passport or a copy certified by the issuing authority. (Mailing your original passport internationally is scary, with good reason.)
• Through a CAA (Certifying Acceptance Agent): an authorized agent verifies your passport and sends the application without you losing sight of the document. It's the route most used by non-residents.
• In person at an IRS Taxpayer Assistance Center (only if you're in the US).

The usual turnaround is around 7 to 11 weeks from when the IRS receives the complete application. If you file outside peak season (January–April), it tends to go faster.

The mistake that costs the most time

Requesting the ITIN "just in case", without a real tax obligation behind it. The IRS rejects W-7s with no valid reason (no return attached and no exception document to justify it). The result: weeks lost and a passport bouncing around for nothing.

The correct sequence for the typical non-resident is the reverse of what many believe: first you form the LLC and get the EIN, you operate normally, and you only apply for the ITIN when the specific obligation that requires it appears. As long as that obligation doesn't exist, the ITIN adds nothing. And if your LLC is still waiting on the EIN, check what you can get done without the EIN while it arrives instead of getting stuck on an ITIN you probably don't need.

The ITIN is not an entry requirement to have an LLC. It's a tool for a specific personal obligation. If you don't have that obligation, you don't need it — and requesting it early only adds friction.