ITIN vs SSN vs EIN

Three nine-digit numbers cause more confusion for non-resident Wyoming LLC owners than almost anything else in the formation process. They all look identical on paper. They are all issued by the United States. They all get described, loosely, as a "tax ID." And yet they serve completely different functions, are issued by different agencies, and follow completely different application paths. Picking the wrong one, or assuming you need all three, is one of the most common and most expensive mistakes a foreign founder makes. The short version: your LLC almost certainly needs an EIN, you almost certainly cannot get an SSN, and you probably do not need an ITIN at all. The longer version is below, because the exceptions matter and the failure modes are costly.

The one-sentence answer, then the nuance

An SSN identifies a person who is authorized to live and work in the United States. An ITIN identifies a person who must deal with the US tax system but cannot get an SSN. An EIN identifies a business entity. For a non-resident who owns a Wyoming LLC, the entity is the thing that needs a number, so the EIN does almost all the work: it opens bank accounts, connects to payment processors, and goes on every federal form your disregarded entity files.

The nuance is that the EIN belongs to the LLC, not to you. It is the LLC's identifier, the way a passport number identifies you and not your company. When a personal obligation arises, such as actually filing a US personal income tax return, the EIN cannot stand in for you. That is the narrow gap an ITIN fills, and it is narrow on purpose. Most non-resident owners who sell digital products, run an agency from abroad, or dropship to US customers never touch that gap, because they have no US personal filing obligation in the first place.

Hold onto one distinction as you read: a number that identifies the company versus a number that identifies the human. Almost every wrong answer in this area comes from blurring those two together.

SSN: the one you cannot get (and do not need)

The Social Security Number is issued by the Social Security Administration, not the IRS, and it exists primarily to track earnings for Social Security benefits. By extension it became the de facto personal identifier in the US for credit, employment, and tax filing. Its format is XXX-XX-XXXX, and it is reserved for US citizens, permanent residents, and non-citizens who hold specific work authorization, such as certain visa holders permitted to be employed in the US.

If you are a non-resident living abroad with no US work authorization, you are not eligible for an SSN, full stop. There is no application path that produces one for a foreign founder who simply owns a company. This is not a bureaucratic inconvenience to be worked around; it is a categorical exclusion, and that is genuinely good news. You do not need an SSN to form a Wyoming LLC, to get the LLC an EIN, to open a fintech account, or to connect Stripe. Anyone who tells you that you must "get an SSN first" has misunderstood how non-resident formation works.

The only scenario in which an SSN re-enters the picture is if your immigration status changes and you become an authorized US worker, for instance by moving to the US on a work visa. At that point you obtain an SSN through the SSA in connection with that status, not because of your LLC. For the entirety of an ordinary non-resident ownership situation, you can treat the SSN as a number that simply does not apply to you.

ITIN: the personal-filing number you probably will not use

The Individual Taxpayer Identification Number is the IRS's answer to a specific problem: some people have to interact with the US tax system but are not eligible for an SSN. The ITIN closes that gap. Its format always begins with a 9, and the middle two digits fall in specific ranges the IRS controls, so an ITIN reads like 9XX-7X-XXXX or 9XX-8X-XXXX. It is purely a tax-processing number. It conveys no work authorization, no immigration benefit, and no eligibility for Social Security. It exists so the IRS can match a personal tax filing to a person.

You apply for an ITIN with Form W-7, and you must attach proof of identity and foreign status, which in practice means a passport, submitted either as a certified copy or verified through an IRS-authorized Certifying Acceptance Agent so you are not mailing your only passport across the world. Crucially, the IRS generally will not issue a standalone ITIN just because you would like to have one. You normally must attach the W-7 to a US tax return that requires the number, or qualify under one of the narrow exceptions (such as certain third-party reporting or withholding situations). The processing time is long compared to an EIN, on the order of roughly 8 to 12 weeks, and longer during peak filing season.

For a non-resident Wyoming LLC owner, the practical question is simply: do you have a US personal filing obligation, or a third party that demands a personal US tax ID? Most do not. If your LLC's income is not effectively connected to a US trade or business, and you have no US-source FDAP income flowing to you personally, you generally have no Form 1040-NR to file, and therefore no reason to obtain an ITIN. The two situations that most often pull a non-resident into ITIN territory are filing a personal Form 1040-NR (which only happens when you actually have a US personal filing requirement) and verifying a personal account with a provider like PayPal that insists on a US taxpayer ID for the responsible person. Outside of those, an ITIN is usually an unnecessary detour that costs weeks and accomplishes nothing.

EIN: the number your LLC actually runs on

The Employer Identification Number is the workhorse. It is issued by the IRS to identify a business entity, and despite the word "Employer" in its name, you do not need a single employee to require one. Its format is XX-XXXXXXX, two digits then seven, which is how you can tell an EIN apart from an SSN or ITIN at a glance. The EIN is permanent: it does not expire, does not need renewal, and stays attached to the entity for the life of the company.

For a non-resident's Wyoming LLC, the EIN is what makes the company operational in the US financial system. You need it to open an account with Mercury, Relay, or Wise; to connect Stripe; to register as an Amazon seller; and to put on top of the LLC's annual federal filings. A foreign-owned single-member LLC is treated as a disregarded entity and must file Form 5472 together with a pro forma Form 1120 each year, and the EIN is the identifier on those forms. So even an owner with zero US tax liability still needs the EIN purely to satisfy that information-reporting obligation, where the penalty for non-filing under IRC 6038A is $25,000.

The part that surprises people is that you can get an EIN with no SSN and no ITIN. The IRS issues EINs to entities regardless of the owner's nationality or whether the owner has any US personal tax ID. The catch is purely procedural: the IRS online EIN application requires the responsible party to enter an SSN or ITIN, so non-residents without one simply cannot use the online tool. Instead you file Form SS-4 by fax (or mail), the IRS processes it manually, and the EIN comes back in roughly 8 to 10 business days. This is a well-worn path, not an exotic one, and it is exactly what a proper formation service handles for you.

Side-by-side: the three numbers at a glance

The table below collapses the distinctions into a single view. Read it as "who or what is being identified," because that is the axis that actually determines which number you need.

One row deserves a footnote: ITINs can deactivate. The IRS will deactivate an ITIN that has not appeared on a US tax return for several consecutive years, and it has periodically deactivated older ITINs in batches. If you obtained an ITIN years ago for some one-off reason and now need it again, confirm it is still active before relying on it. EINs do not have this problem; once issued, an EIN stays valid.

A worked example: Sofia in Argentina

Sofia lives in Buenos Aires and runs a Shopify store selling print-on-demand apparel to US customers. She forms a Wyoming LLC and wants to know which numbers she needs. Walk through her actual tasks, one at a time, and the answer falls out cleanly.

She needs to open a Mercury account to receive customer payments: that uses the LLC's EIN. She needs to connect Stripe so her store can charge cards: Stripe wants the LLC, the EIN, a US bank account, and a W-8BEN-E on file, then approves the account, typically within roughly 1 to 14 days; no personal SSN or ITIN involved. She has to file Form 5472 with a pro forma 1120 next April for her disregarded single-member LLC: again the LLC's EIN, due April 15, extendable with Form 7004.

Now the personal side. All of Sofia's work happens in Argentina; she has no US office, employees, or dependent agents, so her income is generally not effectively connected to a US trade or business, and she has no US-source FDAP income coming to her personally. That means no Form 1040-NR, which means no ITIN. The single number that runs her entire operation is the EIN. The only thing that would change this picture is if a provider like PayPal demanded a US taxpayer ID for her as the responsible individual, in which case she would file Form W-7 for an ITIN, or if her facts shifted and she genuinely created effectively connected income, which would create a personal filing obligation. Absent that, she correctly gets one number and ignores the other two. Whether your facts create a US trade or business or ECI is a judgment call worth confirming with a CPA.

Which ID for which task

People learn this best as a lookup table of real tasks rather than abstract definitions. Here is the mapping non-resident owners actually use:

• Open Mercury, Relay, or Wise for the LLC: the LLC's EIN.
• Connect Stripe to your store: the LLC's EIN (plus a US bank account and W-8BEN-E).
• Register an Amazon seller account for the LLC: the LLC's EIN.
• File Form 5472 and the pro forma 1120: the LLC's EIN.
• File the LLC's Wyoming annual report: no federal tax ID needed; it is a state filing.
• File your personal Form 1040-NR, only if you actually have a US personal filing obligation: your ITIN.
• Verify a personal PayPal account that demands a US taxpayer ID for the responsible person: your ITIN.
• Work as a US employee on payroll: an SSN, which a non-resident generally cannot obtain.

Notice that the EIN appears on nearly every business task and the ITIN appears only on genuinely personal ones. If a task involves the company, reach for the EIN. If a task involves you, the human, filing or verifying personally, that is the rare moment an ITIN might be relevant.

Common mistakes that cost real money and time

The first and most expensive mistake is applying for an ITIN you do not need before forming the company. Founders read that "non-residents need a US tax ID" and assume that means an ITIN. It usually does not. They lose 8 to 12 weeks waiting for a number that was never on the critical path, when an EIN, the number they actually needed, takes about 8 to 10 business days. Form the LLC, get the EIN, and only pursue an ITIN if a concrete filing or a specific provider forces the issue.

The second mistake is trying to put a personal ID on a business form, or vice versa. The LLC's EIN goes on Form 5472, on bank applications, and on Stripe; your personal ITIN never substitutes for it there. Conversely, you cannot file a personal Form 1040-NR using the LLC's EIN, because the 1040-NR identifies you, not your company. Mixing these up produces rejected filings and processing delays. Keep the mental model strict: entity number on entity forms, personal number on personal forms.

A few more traps worth naming. Some founders try the IRS online EIN tool, hit the SSN/ITIN requirement, and conclude they cannot get an EIN at all; the real answer is to file SS-4 by fax. Others assume a tax ID from their home country can be entered wherever a US form asks for a taxpayer ID; it cannot, because foreign tax IDs are not US tax IDs and are not interchangeable. And some treat the EIN as if it expires and reapply needlessly, creating duplicate records; an EIN is permanent, so apply once and keep it.

Edge cases: where the simple rule bends

Multi-member foreign-owned LLCs change the personal-side math. A foreign-owned LLC with two or more members is treated as a partnership, not a disregarded entity. It files Form 1065 and issues each partner a Schedule K-1, generally due March 15. If the partnership has income effectively connected to a US trade or business, Section 1446 withholding kicks in, the partnership files Form 8805, and each foreign partner files a personal Form 1040-NR, which requires a personal taxpayer ID. In that situation the foreign partners genuinely do need ITINs, because they each have a personal US return to file. The partnership itself still uses its own EIN. So a multi-member structure with ECI is one of the clearest cases where the ITIN moves from "probably not" to "yes."

There are smaller edge cases too. If you elect to have your LLC taxed as a corporation, the entity files its own corporate return under its EIN, which can shift the personal picture. If you ever take a salary as a genuine US employee, that is the SSN/work-authorization world, not the LLC-owner world. And if you obtained an ITIN years ago, remember it may have deactivated through disuse and may need to be renewed via Form W-7 before a current filing will accept it. None of these change the core hierarchy; they just determine whether the personal-side number ever comes into play. The throughline remains: the EIN is the entity's number and is nearly always required, while the SSN and ITIN are personal numbers that most non-resident owners will never need.

When in doubt about whether your specific facts create a US personal filing obligation, confirm with a US CPA before spending weeks on an ITIN application, because the answer turns on whether you have effectively connected income or US-source FDAP income, and that is a judgment that depends on the details of how and where you operate.

If you are ready to get the one number that actually matters, forming your Wyoming LLC with us includes the EIN obtained for non-residents via Form SS-4 (no SSN required), a registered agent, and the full setup for $397, all-inclusive. The LLC is typically formed in about 24 hours and the EIN follows in roughly 8 to 10 business days, with no US visit, US address, or visa needed, so you can move straight to opening accounts and connecting Stripe instead of chasing IDs you do not need.