Some links on this website may be affiliate links. If you purchase through them, we may earn a commission at no extra cost to you.
Short answer: An ITIN (Individual Taxpayer Identification Number) is a 9-digit US tax ID the IRS issues to people who need a US tax number but don’t qualify for a Social Security number. You apply on Form W-7, prove your identity with a passport, and wait about 7 weeks (9–11 in peak season). But here’s what most guides bury: you do not need an ITIN to form a US LLC, get an EIN, open most US business bank accounts, or activate Stripe. For most single-member LLC owners, the EIN does the day-to-day work. An ITIN only becomes necessary when you personally must file a US tax return, claim tax treaty benefits, or a specific bank or processor asks for one. This guide shows you how to decide — and exactly how to apply if you do.
Table of Contents
- ITIN vs EIN vs SSN
- Do You Actually Need an ITIN? A Checklist for LLC Owners
- Who Can Apply: Eligibility Categories in Plain English
- Documents You Need
- Step by Step: Completing Form W-7
- Three Ways to Submit Your Application
- How Long Does It Take?
- Common Rejection Reasons and How to Avoid Them
- ITIN Expiration and Renewal
- What to Do After Your ITIN Arrives
- FAQ
- Conclusion
ITIN vs EIN vs SSN
Three different numbers, three different jobs — and mixing them up is the biggest source of confusion for foreign founders.
| ITIN | EIN | SSN | |
|---|---|---|---|
| Issued by | IRS | IRS | Social Security Administration |
| Who it’s for | An individual who needs a US tax ID but can’t get an SSN | A business or entity (your LLC) | US citizens and non-citizens authorized to work in the US |
| Format | 9 digits, always starting with 9 | 9 digits (XX-XXXXXXX) | 9 digits |
| What it does | Lets you file personal US tax returns | Identifies your business for taxes, banking, and Stripe | Work authorization, employment, benefits, and taxes |
| Can a non-resident get one? | Yes — that’s who it’s designed for | Yes — no SSN, ITIN, or US address required | No, not without work authorization |
Two rules worth memorizing:
- The ITIN is personal; the EIN belongs to the LLC. Your LLC’s filings, bank accounts, and Stripe account run on the EIN. Your personal returns run on the ITIN.
- An ITIN is for federal tax purposes only. It doesn’t authorize work in the US, change your immigration status, or entitle you to Social Security benefits — and it’s not a general-purpose ID.
If you later become eligible for an SSN, apply for one and ask the IRS to combine your records under it.
Do You Actually Need an ITIN? A Checklist for LLC Owners
You do NOT need an ITIN to:
- Form an LLC in any US state. No state asks the owner for an ITIN or SSN. A formation service such as Registered Agents Inc handles the filing for $100 + state fee, and no personal US tax ID is requested at any step.
- Get an EIN for your LLC. Foreign owners apply on Form SS-4 by fax; where the form asks for the responsible party’s tax ID, you simply write “foreign.” The IRS issues EINs to foreign-owned LLCs every day this way.
- Open most online US business bank accounts. The fintech platforms foreign founders typically use verify your passport and your LLC’s EIN, not a personal ITIN.
- Activate Stripe on a US LLC. Stripe verifies your identity with your passport and the business with its EIN.
- File Form 5472 and the pro-forma Form 1120 for a foreign-owned single-member LLC. That annual filing is made under the LLC’s EIN — no owner ITIN required.
You DO (or soon will) need an ITIN if:
- You personally must file a US tax return — for example, Form 1040-NR for US-source income, or a claim for a refund of over-withheld tax.
- You want to claim tax treaty benefits on a US return.
- A traditional US bank asks for one. Some brick-and-mortar banks require a US tax ID from foreign owners; if yours does, an ITIN is usually the answer.
- A payment processor, marketplace, or client requires a personal US taxpayer ID from you for information reporting — for instance, before releasing certain payouts.
- You receive US-source income subject to withholding in your own name — such as selling US real estate — where a personal taxpayer number is required on the paperwork.
If none of that applies yet, the honest advice is: form the LLC, run it on the EIN, and apply for the ITIN when a real trigger appears. There’s no penalty for waiting — and applying “just in case” is itself a rejection risk (see below).
Who Can Apply: Eligibility Categories in Plain English
The IRS does not issue ITINs on request. You qualify only if you are filing a US federal tax return without an SSN, or you meet one of the IRS’s listed exceptions — documented situations where a tax ID is needed even without a return. Form W-7 asks you to tick a reason box (a–h). In plain English, the ones that matter to non-US founders:
- Filing a US tax return as a non-resident (box b) — the most common route for LLC owners with personal US filing duties.
- Claiming a tax treaty benefit (box a) — claiming reduced withholding or an exemption under your country’s treaty with the US.
- “Other” / exception cases (box h) — third-party reporting situations, such as income subject to IRS reporting or withholding where the payer requires your taxpayer number.
The remaining boxes cover dependents and spouses of US citizens, residents, and visa holders — rarely relevant to a solo foreign founder.
Critical detail: if you’re not attaching a tax return, you must attach documentation proving your exception — for example, paperwork from the bank, broker, or payer requiring the number. An unsupported claim is one of the fastest paths to rejection.
Documents You Need
You must prove two things: your identity and your foreign status. The IRS accepts 13 types of supporting documents, including a foreign national ID card, foreign driver’s license, civil birth certificate, foreign voter registration card, and a US visa. In practice:
- A current, valid passport is the only document that proves both on its own. If you have one, it’s all you need as an applicant.
- Without a passport, you must combine two or more documents from the list — the combinations have fiddly rules, so a passport is strongly recommended.
- Documents must be originals or copies certified by the issuing agency. Plain photocopies and notarized copies are not accepted. The exception: apply through a Certified Acceptance Agent or an IRS Taxpayer Assistance Center and they verify your originals in person, so your passport never goes in the mail.
- Documents must be unexpired, show your name and photo, and support your foreign status.
- Applying for a dependent? Expect extra requirements (proof of residency; school or medical records for children), and note that acceptance agents can only certify passports and birth certificates for dependents — other documents still have to be mailed.
Step by Step: Completing Form W-7
- Download the current Form W-7 and instructions from IRS.gov on the week you apply — an outdated revision is an avoidable rejection.
- Tick exactly one reason box (a–h) matching your situation — for most LLC owners filing a personal return, that’s the non-resident filing box; treaty claims use the treaty box, with country and treaty article filled in.
- Enter your name exactly as on your passport, plus mailing address, foreign (non-US) address, date and country of birth, and country of citizenship. Every field must match your document exactly.
- Fill in your identification document details — passport number, issuing country, expiration date.
- Sign and date the form. An unsigned W-7 is rejected automatically — one of the most avoidable mistakes there is.
- Attach the W-7 to the front of your federal tax return if you’re filing one. Claiming an exception instead? Attach the documentation proving it. (Renewals need no return attached.)
- Choose a submission route (next section) and send the package with originals or certified copies, as the route requires.
Three Ways to Submit Your Application
| Route | Cost | Do your originals leave your hands? | Best for |
|---|---|---|---|
| Mail to the IRS in Austin | Free (no IRS fee) | Yes — returned after processing | Applicants comfortable mailing tracked documents |
| IRS Taxpayer Assistance Center (TAC) | Free | No — verified and handed back on the spot | People in the US or traveling there |
| Certified Acceptance Agent (CAA) | Fee-based (check current pricing) | No — the agent certifies your documents | Most non-residents applying from abroad |
Route 1 — Mail. Send the W-7, your tax return (or exception documentation), and original documents or certified copies to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Using a private courier (FedEx, UPS)? Send to: Internal Revenue Service, ITIN Operation, 3651 S. Interregional Hwy 35, Austin, TX 78741-0000. Use a trackable service — you’re mailing a passport. The IRS returns originals by mail after processing.
Route 2 — Taxpayer Assistance Center. Only designated TACs offer in-person ITIN document review, by appointment only (call 844-545-5640). An IRS employee verifies your originals, hands them straight back, and forwards the application. Free, and your passport never leaves your sight — but you must physically be in the US.
Route 3 — Certified Acceptance Agent. CAAs are IRS-authorized agents — accountants, tax firms, financial institutions — who review and certify your documents, then submit the application for you. The IRS lists authorized agents in many countries, so you can often complete everything without leaving home. Your passport stays in your drawer and a professional checks the form first; agents charge their own fees, so check current pricing before engaging one.
How Long Does It Take?
Allow about 7 weeks from the date the IRS receives your W-7. That stretches to roughly 9–11 weeks during peak season (January 15–April 30) and for applications from abroad — which covers most non-US founders.
No word after that window? Check your status at 1-800-829-1040 (from the US) or 1-267-941-1000 (from outside the US). Your ITIN arrives on an IRS notice (CP 565) — keep it safe — and original documents come back separately by mail. There is no online option: Form W-7 is paper-only via the three routes above.
Common Rejection Reasons and How to Avoid Them
Most rejections are paperwork errors, and each one resets your clock:
- Applying “just in case.” No tax return and no documented exception means no ITIN. Wait for a real trigger.
- Photocopies instead of originals or certified copies (mail route). Get certified copies from the issuing agency, or use a CAA/TAC to have originals verified in person.
- Name or date-of-birth mismatch with your passport. Copy details exactly, including middle names and transliteration.
- Missing signature. Sign and date — every time.
- Outdated form revision. Download the current W-7 from IRS.gov the week you apply.
- Expired documents. Your passport must be valid the day you apply.
- Undocumented exception claims. Ticked the treaty or “other” box? Attach the proof — a letter or form from the payer, bank, or broker requiring your number.
If the IRS suspends your application, it sends a notice explaining what’s missing. Respond within the stated timeframe with the corrected documents and the application usually continues rather than starting over.
ITIN Expiration and Renewal
An ITIN is not necessarily yours forever. If it hasn’t been used on a US federal tax return for three consecutive years, it expires on December 31 of the third year. This catches out founders who got one early, didn’t use it for years, and then had credits denied because the number had lapsed.
Renewal is simple:
- File Form W-7 again, ticking the “renew an existing ITIN” box, with the usual supporting documents.
- No tax return needs to be attached to a renewal.
- You keep the same number — the IRS reactivates your original ITIN.
Filing US returns intermittently? Put the renewal on the same calendar as your LLC’s annual filings so the number never lapses mid-season.
What to Do After Your ITIN Arrives
- Keep the CP 565 notice safe — scan and back it up. The notice is your proof of the number.
- Use it only where it belongs: your personal US tax filings, and anywhere a US institution legitimately requires your personal taxpayer ID. Your LLC keeps running on its EIN — banks, Stripe, and Form 5472 never switch to your ITIN.
- Don’t oversell it to yourself. It grants no work authorization, visa, or right to live in the US, and guarantees no bank approval. It’s a tax-processing number, nothing more.
- If you later become eligible for an SSN, apply for it and notify the IRS so your records move over — then stop using the ITIN.
FAQ
Can I form a US LLC without an ITIN?
Yes. No state requires an owner ITIN or SSN, and formation services like Registered Agents Inc file everything for $100 + state fee without asking for one. The LLC operates on its own EIN.
Do I need an ITIN to get an EIN for my LLC?
No. Complete Form SS-4 and write “foreign” where the responsible party’s tax ID is requested; the IRS issues the EIN to your LLC.
Does the Form 5472 for my single-member LLC require me to have an ITIN?
No — it’s filed under the LLC’s EIN. Many foreign owners file it for years without ever holding an ITIN.
How much does an ITIN cost?
The IRS charges nothing. The mail and Taxpayer Assistance Center routes are free; a Certified Acceptance Agent charges a professional fee that varies by agent and country — check current pricing before committing.
Can I apply for an ITIN online?
No. Form W-7 is paper-only: by mail to the IRS in Austin, in person at a designated Taxpayer Assistance Center, or through a Certified Acceptance Agent.
Does having an ITIN let me work in the US or guarantee a bank account?
No. It’s strictly a federal tax-processing number: no work authorization, no immigration status, and each bank still applies its own onboarding rules. It does satisfy the banks and processors that specifically ask foreign owners for a US tax ID.
Conclusion
For a non-US founder, the ITIN question has a reassuring answer: it’s a later problem, not a first step. Form the LLC, get the EIN, open your accounts, and start trading — the ITIN enters the picture only when you personally owe the IRS a return, claim treaty benefits, or meet a bank that insists on one. When that day comes, the process is mechanical: current Form W-7, your passport, one of three submission routes, and 7–11 weeks of patience. Still at the starting line? Registered Agents Inc can form your LLC for $100 + state fee with the registered agent included — no ITIN required at any point. Apply for one only when your business actually needs it.
This article is general information about the ITIN application process, not legal or tax advice. ITIN eligibility, treaty benefits, and US filing obligations depend on your country, immigration status, and income sources — consult a qualified cross-border tax professional about your situation before filing.