ITIN applications: who actually needs one
The ITIN is widely over-prescribed. A large share of non-resident founders are advised to obtain one, spend months on it, and never actually need it.
What it is for
An Individual Taxpayer Identification Number is issued to individuals who have a US tax filing or reporting requirement but are not eligible for a Social Security number.
The operative words are filing or reporting requirement. The ITIN does not create access to anything; it exists so that someone who must appear in the US tax system can be identified in it.
Who genuinely needs one
Typically:
- An individual required to file a US federal return in their own name.
- A person who must be identified on a return filed by someone else — certain partners, beneficiaries or dependants.
- Someone claiming a treaty benefit that requires individual identification.
Who generally does not need one: the owner of a foreign-owned single-member LLC whose filings are made under the entity's EIN. That is the largest group being told otherwise.
We prepare the schedules and bookkeeping, and a licensed US professional signs where the law requires it.
Avail our US tax desk servicesDocumentation is where applications fail
The identity and foreign status standard is strict and it is not the same as ordinary certification.
The IRS generally wants original documents or copies certified by the issuing agency. A passport copy notarised by a local notary — which feels like the obvious solution and is what most applicants send — is frequently not sufficient.
Sending an original passport abroad is understandably unattractive. The alternatives are a certified copy obtained from the passport issuing authority, or applying through an authorised acceptance agent who can verify documents without them leaving your possession. Both routes take planning; neither is instant.
It usually travels with a return
Because the ITIN exists to enable a filing, the application is normally submitted alongside the return that creates the need, rather than in advance. Standalone applications are available only in specific exception categories.
That has a practical consequence worth planning around: you cannot generally obtain the number first and file later. The two move together.
What it is not
It is not work authorisation. It is not immigration status. It is not evidence of residence. It does not entitle you to benefits.
Anyone marketing an ITIN as a route to any of those is misrepresenting it, and acting on that advice creates problems considerably larger than the tax question you started with.
Ask the question first
Before applying, establish exactly which filing or reporting requirement makes the number necessary. If nobody can identify one, you probably do not need it.
Sources
This guide is written against the official and clearly labelled professional references below. Rates, thresholds and portal procedures change between reviews, so open the primary source before relying on a figure.
Questions people also ask
What is the difference between an ITIN and an EIN?
An EIN identifies an entity; an ITIN identifies an individual who is not eligible for a Social Security number but has a US tax reporting requirement. They are not interchangeable and most non-resident founders need only the EIN.
Does an ITIN give me the right to work in the US?
No. It is a tax processing number only. It confers no immigration status, no work authorisation and no entitlement to benefits, and it should never be presented as evidence of any of those.
Do I need an ITIN to open a US bank account?
Usually not for a business account, where the EIN identifies the entity. Requirements vary by institution, so confirm with the specific bank rather than obtaining a number speculatively.
What documentation does the application need?
Identity and foreign status evidence to a strict standard — typically a passport, either original or certified by the issuing agency. Ordinary notarised copies are frequently rejected, which is the most common cause of failure.
Does the application travel with a tax return?
In most cases yes. The ITIN exists to enable a filing, so the application is generally submitted with the return that creates the need. Standalone applications are possible only in defined exception categories.
Send the tax year and the transaction or filing involved, and we will tell you what is actually required.
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