EIN, ITIN, or SSN: Which One Do I Need for My US Business?

Your company needs an EIN. You personally need an ITIN only if you have an obligation to file a US tax return or to be claimed on one. An SSN is generally unavailable to non-residents, because it requires work authorisation in the United States.

Almost all of the confusion here comes from treating these as three versions of the same thing. They identify different parties for different purposes.

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01What Is an EIN, and Does Every Company Need One?

An EIN identifies the business itself. It is what a bank asks for when you open a business account, what a payment processor asks for during underwriting, and what appears on the entity's filings. Practically speaking, if you have formed a US company and intend to do anything with it, you need one. A non-resident owner can obtain an EIN without holding any personal US tax number, which is the single most useful fact in this entire subject and the one most often misreported.

02Then What Is an ITIN For?

An ITIN identifies a person, not a company, and exists specifically for individuals who have a US tax obligation but are not eligible for an SSN. It is issued for tax administration and nothing else. It does not grant work authorisation, it is not immigration status, and it is not a form of identification for any purpose beyond filing. You apply for it when you actually need to file, and typically alongside the return itself.

03Do I Need an ITIN Just Because I Own a US Company?

Not automatically, and this is where owners spend money they did not need to spend. Ownership alone does not create a personal filing obligation. What creates one is having income the United States taxes, most commonly income effectively connected to a US trade or business, which would require you to file Form 1040-NR. If your company's activity does not produce that, you may hold a US entity for years with an EIN and no ITIN at all.

An EIN identifies your company. An ITIN identifies you, and only when you have an actual US filing obligation. Owning a US company does not by itself require an ITIN.

Tax ID

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The taxpayer ID for non-residents, handled end to end.

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04Can I Get an SSN Instead?

Generally no. An SSN is issued to citizens, permanent residents, and people holding a visa that carries work authorisation. If you are a non-resident owner directing your company from abroad, you will not qualify, and the ITIN exists precisely to fill that gap for tax purposes. If you already hold an SSN, you use it where an ITIN would otherwise apply. You never hold both.

05What Order Should I Do This In?

Form the company, then obtain the EIN, then open banking and payment processing, and address the ITIN only when a filing obligation actually arises. Owners who reverse this, pursuing a personal tax number first in the belief that nothing else can proceed without it, tend to delay the parts of the setup that genuinely do gate everything else, particularly the bank account.

06What Goes Wrong Most Often?

Three things, in our experience. An owner applies for an ITIN they do not yet need and waits on it before doing anything else. An owner assumes the company's EIN somehow covers their personal filing, and discovers otherwise at the deadline. Or an application is submitted with a mismatch between the name on the passport and the name on the entity documents, which is a slow, avoidable rejection that costs weeks rather than money.

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07How Prodezk Handles This

We determine which numbers your specific situation actually requires before anything is filed, secure the EIN as part of formation, and pursue an ITIN only where a real filing obligation makes it necessary. Getting the sequence right is usually worth more than getting any single application processed quickly. Speak with an advisor about which of these you genuinely need.