Do Non-Residents Need an ITIN to Run a US LLC?

One of the most confusing topics for non-resident founders is whether they need an ITIN (Individual Taxpayer Identification Number) to operate their US LLC. The confusion is understandable — there are multiple types of US tax identification numbers, and it's not always clear which ones apply to you.

This guide gives you a clear, definitive answer: when you need an ITIN, when you don't, how it differs from an EIN, and how to apply if you do need one.

ITIN vs EIN: Understanding the Difference

First, let's clear up the most common confusion: an ITIN and an EIN are completely different numbers for completely different purposes.

Key takeaway: Your LLC needs an EIN. Whether you need an ITIN depends on your personal tax situation.

Do You Need an ITIN? The Decision Tree

Answer these questions to determine if you need an ITIN:

Question 1: Is your LLC a single-member LLC treated as a disregarded entity?

If yes (which is the most common structure for non-residents), your LLC doesn't file a separate income tax return. Instead, it files Form 5472 with a pro forma Form 1120 — and this filing uses the LLC's EIN, not your personal ITIN.

If your LLC has elected to be taxed as a C-Corporation or S-Corporation, you may need an ITIN for personal tax obligations. Consult a CPA.

Question 2: Do you have US-source income outside the LLC?

If you receive income directly (not through the LLC) from US sources — such as rental income from US property, dividends from US stocks, or wages from a US employer — you may need to file a personal US tax return, which requires an ITIN.

If all your US business income flows through the LLC, this typically doesn't apply.

Question 3: Do you want to claim US tax treaty benefits?

If your home country has a tax treaty with the US and you want to claim reduced withholding rates on certain types of income, you'll need an ITIN to file the appropriate forms.

Question 4: Are you required to file a US personal tax return for any other reason?

Certain situations trigger a personal US tax filing requirement even for non-residents — for example, selling US real estate or having certain types of US investments. If you need to file a personal return, you need an ITIN.

The Bottom Line

For the typical non-resident founder with a single-member LLC treated as a disregarded entity, you do not need an ITIN. Your LLC's EIN handles all business-related tax identification. The LLC files Form 5472 (using the EIN), and you have no personal US tax filing obligation.

When an ITIN IS Required

While most non-resident LLC owners don't need an ITIN, here are the specific situations where you would:

1. Your LLC elected C-Corp or S-Corp tax treatment — If your LLC is taxed as a corporation, you may have personal tax obligations that require an ITIN (e.g., receiving salary or dividends from the corporation).
2. You have US rental income — If you own US real property and receive rental income, you need to file a personal tax return with an ITIN.
3. You sell US real estate — Capital gains from US real property require a personal tax filing.
4. You have US investment income — Dividends, interest, or capital gains from US investments may require filing.
5. You want tax treaty benefits — Claiming reduced withholding rates under a US tax treaty requires an ITIN and filing Form 8833.
6. A bank or platform requires it — Some traditional US banks require an SSN or ITIN for account opening, even for business accounts. If your bank requires one and you can't switch to a bank that doesn't (like Mercury), you'll need to apply.

How to Apply for an ITIN

If you do need an ITIN, here's how to get one:

Method 1: Mail Application (DIY)

1. Complete IRS Form W-7 — Available at irs.gov. Fill in your personal information, the reason you're applying (check the appropriate box), and your foreign address.
2. Prepare your supporting documents — You must include either your original passport or a certified copy from the issuing agency (not a notarized copy — the IRS only accepts copies certified by the passport-issuing government).
3. Attach a federal tax return — Form W-7 must generally be submitted with the federal tax return that requires the ITIN (e.g., Form 1040-NR). There are exceptions for certain treaty benefits.
4. Mail to the IRS — Send the package to: IRS ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342.
5. Wait 7-11 weeks — The IRS will mail your ITIN assignment letter to the address on the W-7.

The major downside: You must mail your original passport to the IRS, and it takes 7-11 weeks to get it back. During this time, you cannot travel internationally.

Method 2: Certifying Acceptance Agent (Recommended)

A Certifying Acceptance Agent (CAA) is an individual or organization authorized by the IRS to verify your identity documents and submit the ITIN application on your behalf. The advantage: you don't have to mail your passport to the IRS.

1. Find a CAA — The IRS maintains a list at irs.gov. Many international tax firms and accounting firms are CAAs. Some operate remotely and can verify your documents via video call.
2. Provide your documents — The CAA verifies your passport and identity in person or via secure video.
3. The CAA submits Form W-7 — They attach a Certificate of Accuracy instead of your original passport.
4. Processing time — Same 7-11 weeks, but you keep your passport.

CAA fees typically range from $150-400, depending on the provider and whether additional tax return preparation is needed.

Method 3: In-Person at IRS Office

If you're visiting the US, you can apply in person at an IRS Taxpayer Assistance Center (TAC). Bring your passport, completed Form W-7, and the associated tax return. The advantage is that the IRS verifies your identity on the spot and you keep your passport. However, TAC appointments can be difficult to schedule and are only available at IRS offices in the US.

ITIN Myths and Misconceptions

Myth: "I need an ITIN before I can get an EIN"

False. You can apply for an EIN without having an ITIN or SSN. On Form SS-4 (the EIN application), there is a field for the "responsible party's" SSN or ITIN, but non-residents can apply by fax or phone without one. The IRS assigns the EIN to the LLC based on the entity's information, not the owner's personal tax ID.

Myth: "I need an ITIN to open a US bank account"

Mostly false. For LLC business bank accounts, the bank primarily needs the LLC's EIN. Neobanks like Mercury and Wise Business do not require the owner to have an ITIN. Some traditional banks do ask for an SSN or ITIN, but these are generally not the best options for non-residents anyway.

Myth: "An ITIN lets me work in the US"

False. An ITIN is a tax processing number only. It does not authorize employment in the United States, provide immigration status, or grant any legal rights beyond tax filing. Only a Social Security Number (SSN) authorizes US employment, and SSNs are only available to US citizens, permanent residents, and certain visa holders.

Myth: "I need an ITIN to file Form 5472"

False. Form 5472 is filed with a pro forma Form 1120 using the LLC's EIN. The form includes information about the foreign owner (your name and address), but it does not require you to have an ITIN. Your CPA files it using the LLC's EIN as the primary identifier.

Myth: "An ITIN expires and then I lose it"

Partially true. ITINs do expire if not used on a federal tax return for three consecutive years, or if issued before 2013 (under a rolling expiration schedule). However, expired ITINs can be renewed by filing a new Form W-7. You don't lose the number — you just need to renew it before using it again.

ITIN Costs Summary

Practical Recommendation for Non-Resident Founders

If you're a non-resident with a single-member US LLC treated as a disregarded entity, here's the practical advice:

1. Don't apply for an ITIN proactively. Wait until you actually need one. Most non-resident LLC owners never need one.
2. Get your LLC's EIN first. This is the number that matters for business operations — banking, Stripe, PayPal, invoicing, and Form 5472 filing.
3. Use Mercury or Wise Business for banking. These platforms don't require an ITIN for non-resident LLC owners.
4. Consult a CPA if your situation changes. If you start earning US income outside the LLC, invest in US assets, or want to elect corporate tax treatment, ask your CPA if you need an ITIN at that point.
5. If you do need one, use a CAA. Spending $150-400 on a Certifying Acceptance Agent is worth it to avoid mailing your passport to the IRS for 11 weeks.

Conclusion: Most Non-Residents Don't Need an ITIN

The answer for most non-resident US LLC owners is simple: you don't need an ITIN. Your LLC's EIN handles all business tax identification. The ITIN is a personal tax number that's only relevant if you have personal US tax filing obligations beyond the LLC's Form 5472. Don't let confusion about tax identification numbers delay your LLC setup. Get the EIN, open your bank account, set up your payment processors, and start invoicing. If an ITIN becomes necessary later, you can apply at that point.