What Is an ITIN and How to Apply (2026): Guide for Non-US Founders

Published: June 23, 2026

A Message from Slava

I'm Slava, founder of Jupid. Before this, I built Anna Money, where we worked with more than 60,000 small businesses and grew to $40M ARR. A surprising number of those owners were not US citizens or residents. They were founders in Lagos, Berlin, and São Paulo who had spun up a US LLC to take Stripe payments, sell on Amazon, or land American clients, and then hit the same wall: the US tax system wanted a number for them, and they did not have a Social Security number.

That number is the ITIN. In conversations with non-resident founders, I see the same confusion constantly. People mix up the ITIN with the EIN, assume it lets them work in the US, or apply at the wrong time and wait three months for a rejection. None of that is the founder's fault. The rules are scattered across IRS pages, and most of the advice online is written for someone else's situation.

This guide fixes that. An ITIN is a federal tax processing number for people who have a US filing obligation but cannot get an SSN. It is not a work permit, it is not immigration status, and it is not the same thing as your company's EIN. I'll walk through exactly who needs one, how the Form W-7 application works, the documents the IRS accepts, what an ITIN does and does not let you do, and a full worked path for a non-resident who owns a US LLC.

Here's what we'll cover:

• What an ITIN is and who actually needs one
• ITIN vs SSN vs EIN, side by side
• How to apply with Form W-7 (three routes)
• The identity documents the IRS accepts
• Renewal, expiration, and the mistakes that cost weeks

What an ITIN Actually Is

An Individual Taxpayer Identification Number (ITIN) is a 9-digit number the IRS issues to people who need a US taxpayer identification number for federal tax purposes but are not eligible for a Social Security number. It has the same format as an SSN (XXX-XX-XXXX) and always starts with the digit 9.

The IRS created the ITIN so that anyone with a US tax obligation can file a return and be tracked in the system, regardless of immigration status. That is the whole point: it exists purely for tax administration. It lets a non-resident report income, claim a refund or a treaty benefit, or be listed as a spouse or dependent on someone else's return.

Here's the part that trips people up. An ITIN is tied to a person. It is not a business number, and it is not interchangeable with the EIN your LLC uses. If you run a US business as a foreign owner, you may end up needing both: an EIN for the company and an ITIN for yourself. More on that distinction below.

Who Needs an ITIN

You need an ITIN if you have a federal tax purpose and you cannot get an SSN. The most common situations:

• Non-resident founders who owe US tax or want a refund. If you earn income effectively connected with a US trade or business, or you have US-source income with withholding you want refunded, you file a US return and need a taxpayer number on it.
• Foreign owners of US LLCs who have a personal filing requirement, want to claim a tax treaty benefit, or need a number for a partnership return (Schedule K-1).
• Spouses and dependents of US citizens or residents who are claimed on a return for a tax benefit but are not eligible for an SSN.
• Resident aliens filing a US return based on the substantial presence test (generally present in the US more than 183 days under the day-count rule) who have not yet received an SSN.
• Foreign students, professors, and researchers with a US filing obligation who cannot get an SSN.

You are not eligible for an ITIN if you can get an SSN. That includes US citizens, green card holders, and anyone with work authorization. If you fall into that group, apply for an SSN through the Social Security Administration instead. The IRS will reject a W-7 from someone who qualifies for an SSN.

One nuance for LLC owners: forming a US LLC does not, by itself, require you to have an ITIN. Whether you need one depends on your personal filing requirements. A foreign owner of a US single-member LLC with no US-connected income may need an EIN for the company and a Form 5472 filing, but not necessarily a personal ITIN. We work through that exact case later in this guide.

ITIN vs SSN vs EIN

These three numbers get blurred together constantly, and using the wrong one slows down everything from opening a bank account to filing a return. Here is the clean version.

The short rule: an SSN is for a person who can work in the US, an ITIN is for a person who has a US tax obligation but cannot get an SSN, and an EIN is for a business, not a person. Your LLC has an EIN. You, the owner, may have an ITIN.

If you are setting up the business side, our guide on Form SS-4 and the EIN application covers how a foreign owner gets a company EIN, and how to find your EIN number helps if you already have one buried in your paperwork. The two numbers serve different jobs, and you may genuinely need both.

What an ITIN Does NOT Grant

This is the most important section for non-resident founders, because the misunderstandings here are expensive. The IRS is explicit that an ITIN does not:

• Authorize you to work in the US. It is a tax number, not a work permit.
• Provide or change immigration status. Getting an ITIN has no effect on a visa, green card, or residency claim.
• Qualify you for Social Security benefits or the Earned Income Tax Credit. Those are tied to an SSN.
• Serve as identification outside the federal tax system. It is not a national ID. Some banks accept it for account opening, but it is not designed as general-purpose ID.

What an ITIN does let you do is file a federal return and claim the tax benefits you are legally entitled to. With a valid ITIN, you can file jointly with a spouse, claim head of household status, and claim certain credits where you otherwise qualify, including the Child and Dependent Care Credit, the Premium Tax Credit, the Credit for Other Dependents (up to $500), and the American Opportunity Tax Credit (up to $2,500). It does not, however, open the door to the EITC.

How to Apply: Form W-7

You apply for an ITIN with Form W-7, Application for IRS Individual Taxpayer Identification Number. The application has three parts that travel together:

1. The completed Form W-7 itself
2. A US federal tax return (in most cases — exceptions below)
3. Original or certified identity and foreign-status documents (or copies certified by a Certified Acceptance Agent)

Pick your reason for applying

The top of Form W-7 asks you to check a box for why you need an ITIN. Choosing the right one matters because it determines whether you need to attach a return and which documents you supply. The reason codes:

Most non-resident founders filing a US return land on box b. A founder claiming only a reduced-withholding treaty benefit without filing a return uses box a under an exception.

Attach a federal tax return

The general rule is that Form W-7 must be submitted with a completed US federal tax return. You mail the return and the W-7 together to the ITIN unit — you do not file the return separately first. This is the rule people get wrong most often: they apply for the ITIN, wait, and only then file. That is backwards. The return and the application go in the same envelope.

There are exceptions that let you apply without attaching a return — for example, passive income subject to third-party withholding or treaty benefits, certain mortgage-interest reporting, dispositions of US real property, and a few others. If you qualify for an exception, you check box h and attach the documentation that supports it instead of a return.

The Documents the IRS Accepts

The IRS needs to verify two things: your identity and your foreign status. There is exactly one document that proves both on its own.

The passport is the only stand-alone document. A valid, unexpired passport satisfies both the identity and foreign-status requirements by itself. This is why almost every clean ITIN application leads with a passport.

If you do not submit a passport, you need two documents from the IRS list, and together they must establish both identity and foreign status, with at least one showing your photograph. Accepted documents include:

• National identification card (must show name, photo, address, date of birth, and expiration date)
• US or foreign driver's license
• US state identification card
• Foreign voter's registration card
• US or foreign military ID card
• USCIS photo identification
• Visa issued by the US Department of State
• Civil birth certificate (required for dependents under 18 if no passport)

For dependents, school records (under 24) or medical records (under 6) can be used. The photo requirement is waived for dependents under 14 (under 18 if a student).

A critical detail: if you mail original documents to the IRS, you are sending your actual passport, and it can be gone for weeks. That risk is the main reason most non-resident founders use a Certified Acceptance Agent instead, which we cover next.

Three Ways to Submit

You have three routes to get a W-7 packet to the IRS. They differ mostly in whether you have to part with your original passport.

1. By mail to the IRS ITIN unit. You send the W-7, your tax return, and your original or agency-certified documents to:

Internal Revenue Service
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342

This works, but it means mailing your original passport internationally and waiting for the IRS to return it. For most founders abroad, that is a non-starter.

2. Through a Certified Acceptance Agent (CAA). A CAA is an individual or firm the IRS has authorized to verify your identity documents and certify them. The CAA reviews your originals, certifies the copies, and returns your passport to you on the spot — you never mail it to the IRS. CAAs operate both inside and outside the US, which makes this the standard route for non-residents. You'll pay a fee, but you keep your passport.

3. In person at an IRS Taxpayer Assistance Center (TAC). Some IRS TACs verify ITIN documents in person, by appointment only (schedule by calling 844-545-5640). They authenticate your passport and return it immediately, so this is a good option if you are physically in the US and near a participating center.

Processing Time

Once a complete packet reaches the IRS, plan on a wait. The IRS asks you to allow 7 weeks to be notified of your application status in writing. During peak season — January 15 through April 30 — or if you apply from overseas, it can take 9 to 11 weeks.

The practical implication: do not wait until April to start. If you have a return due and no ITIN yet, file Form 4868 for an automatic extension (you can request an extension without an ITIN) so you are not racing the clock while your W-7 sits in the queue.

Worked Example: Non-Resident LLC Owner

Here is the path most non-resident founders actually walk. Maria lives in Spain, has no US ties, and forms a US single-member LLC to bill American SaaS clients through Stripe.

STEP 1 — Form the LLC and get a company EIN
  Maria's LLC needs an EIN to open a US bank account and file.
  No SSN or ITIN? She can't apply online — she files Form SS-4
  by fax or mail (foreign applicants can also call the IRS
  international line). EIN belongs to the COMPANY, not to Maria.

STEP 2 — Figure out her personal filing requirement
  A single-member LLC is a "disregarded entity." Because the
  owner is foreign, the LLC files Form 5472 + a pro forma
  Form 1120 each year — even with no US tax due. (Missing this
  filing carries a $25,000 penalty.) This filing uses the
  COMPANY's EIN, not a personal ITIN.

STEP 3 — Does Maria need a personal ITIN?
  - If her income is NOT effectively connected to a US trade or
    business and she has no personal US return to file, she may
    NOT need an ITIN at all — only the EIN + Form 5472.
  - If she HAS a personal US filing obligation (e.g., income
    effectively connected to a US business, or she wants to
    claim a treaty benefit on a 1040-NR), she needs an ITIN.

STEP 4 — Apply for the ITIN (if needed)
  - Complete Form W-7, check box "b" (nonresident filing a return).
  - Attach her Form 1040-NR for the year.
  - Use a CAA in Spain so she keeps her passport.
  - Mail timeline: budget ~9-11 weeks from abroad.

STEP 5 — File on time
  If the ITIN won't arrive before the deadline, file Form 4868
  for an extension first, then submit the W-7 + return together.

The headline lesson: an EIN and an ITIN solve different problems. Many foreign LLC owners need the EIN and the Form 5472 filing, but only some need a personal ITIN. Figure out your personal filing requirement before you mail a W-7. Our single-member LLC tax guide goes deeper on the disregarded-entity rules, and if a US client ever asks you to fill out a W-9 form, note that non-residents use Form W-8BEN instead — your ITIN or EIN goes on that.

Renewal and Expiration

An ITIN is not permanent. It expires if it is not used on a US federal tax return for three consecutive tax years — at which point it lapses on December 31 of that third year. To use it again, you renew it.

You renew with the same Form W-7, this time checking the box "Renew an existing ITIN." A few rules worth knowing:

• You must renew if the ITIN will appear on a US federal return you are filing. Filing with an expired ITIN means processing delays and the loss of certain credits until it is renewed.
• If your ITIN appears only on information returns (like a Form 1099 reporting payments to you), you do not need to renew it. Expired ITINs can still be used on information returns.
• Spouses and dependents renewing their ITINs must be listed on an attached US federal tax return claiming a tax benefit — renewal isn't done in a vacuum.

The takeaway for founders: if you file a US return every year, your ITIN stays active automatically. The expiration trap catches people who get an ITIN, file once, and then go several years without a US return.

Common Mistakes to Avoid

Confusing the ITIN with the EIN. The single most common error. The EIN is for your company; the ITIN is for you. Foreign LLC owners often need the EIN and may not need a personal ITIN at all. Sort out which number solves which problem before applying.

Filing the return separately from the W-7. The federal return and the W-7 are supposed to go to the IRS together, in one packet. Filing the return on its own first creates a mismatch and delays.

Mailing your only passport overseas. If you mail originals to the IRS, your passport is out of your hands for weeks. Use a CAA, who certifies your documents and hands the passport back the same day.

Applying at the busiest time. Submitting between January 15 and April 30 pushes you into the 9-to-11-week window. If you can, apply earlier — or file Form 4868 for an extension so a slow W-7 does not make your return late.

Assuming an ITIN lets you work. It does not. It is a tax-processing number only, with no bearing on work authorization or immigration status.

Letting it lapse. Skip US returns for three straight years and your ITIN expires on December 31 of the third year. If you'll keep filing, this never bites you; if you won't, know that you'll have to renew before using it again.

ITIN, EIN, and Your Books in One Place: How Jupid Helps

Getting the ITIN is a one-time slog. Keeping your US business compliant afterward is the recurring work — and that is where most non-resident founders lose time and sleep. You're running a US entity across time zones, with US tax deadlines, US-dollar bookkeeping, and filings like Form 5472 that carry real penalties if you miss them.

Jupid is an AI accountant that lives in WhatsApp and iMessage. Connect your US business bank account, and Jupid pulls in every transaction and auto-categorizes it with 95.9% accuracy, so your books stay clean without a spreadsheet you have to babysit from another continent. When something is ambiguous, you settle it in a quick chat message, and Jupid learns how you categorize so the right treatment sticks going forward.

Because the categorization stays accurate in the background, your numbers are always current and your tax filing is built on data that already lines up. You can ask for a real-time read — "how much US revenue did I book this quarter?" — right in chat and get an answer in seconds, instead of reconstructing it at year-end. Jupid handles the tax compliance side too, which matters when you're managing a US company's obligations from abroad.

The ITIN and EIN get you into the system. Jupid keeps you in good standing once you're there. Try Jupid and let the bookkeeping run itself while you build.

Action Checklist

• Confirm you are not eligible for an SSN (if you are, apply for that instead)
• Decide whether you need an ITIN, an EIN, or both
• Get your company's EIN first if you own a US LLC (Form SS-4)
• Identify your personal US filing requirement before applying for an ITIN
• Complete Form W-7 and check the correct reason box
• Prepare your passport (the only stand-alone document) or two alternate documents
• Attach your US federal tax return, unless you qualify for an exception
• Use a Certified Acceptance Agent so you keep your passport
• Apply outside peak season (Jan 15–Apr 30) when possible; budget 7–11 weeks
• File Form 4868 for an extension if the ITIN won't arrive before your deadline
• Renew the ITIN if it has gone three years without appearing on a return

Sources

• IRS — Individual Taxpayer Identification Number (ITIN)
• IRS — About Form W-7, Application for IRS Individual Taxpayer Identification Number
• IRS — Instructions for Form W-7 (12/2024)
• IRS — How to renew an ITIN
• IRS — About Form 5472 (foreign-owned US disregarded entities)

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This guide is for general educational purposes and does not constitute tax, legal, or immigration advice. ITIN eligibility, filing requirements, and document rules vary by individual situation and change over time. Verify current rules on IRS.gov and consult a qualified tax professional or Certified Acceptance Agent before filing Form W-7 or a US tax return.