How to Get an ITIN as a Non-Resident Founder (W-7 via CAA)

I've processed 50+ ITINs for European founders. The number unlocks $100k+ in US credit lines, but 20 to 35% of direct mail W-7 applications get rejected. The route you pick (Certified Acceptance Agent vs IRS direct mail) decides whether you have your ITIN in 8 weeks or whether you sit without a passport for 4 months and get a rejection letter.

What an ITIN Actually Unlocks

An ITIN (Individual Taxpayer Identification Number) is the IRS's tax ID for people who need to file or be reported on US returns but don't qualify for a Social Security Number. For a European founder with a US LLC, here's what changes the day it arrives:

• You can file Form 1040-NR. Required if you have any US-effectively-connected income, or if you want to claim a treaty refund on withheld dividends or royalties.
• You can apply for credit cards as the principal applicant. Most US issuers (Amex, Capital One, Bank of America, Citi, Wells Fargo) accept ITIN in place of an SSN on the application.
• You can open certain personal bank accounts. Not all banks accept ITIN, but Chase, BoA, and Wells Fargo do at branches with international desks.
• You start building a personal US FICO history. This is the single biggest unlock. Without FICO, you cannot graduate from secured to unsecured business credit cards.
• Treaty withholding gets reduced. Foreign owners receiving US-source dividends or royalties default to 30% withholding. With an ITIN and a properly filed W-8BEN, treaty rates (often 5 to 15%) apply.

What the ITIN does not do: it doesn't authorize you to work in the US, it isn't an SSN, and it doesn't establish residency. It's a tax ID, nothing more.

The Three Submission Routes Compared

There are exactly three legal ways to submit a Form W-7 to the IRS. The choice matters more than founders realize.

For European founders the in-person IRS route is usually impractical (you'd need to fly to the US and book a TAC appointment, which is its own bottleneck). That leaves direct mail or CAA.

Why CAA Is Almost Always Worth It

The cost premium looks ugly on paper. $400 vs $0. Then you do the math.

If you mail your passport directly, you're without it for 11 to 16 weeks. Four months. No travel, no ID for opening bank accounts in your home country, no in-person identity verification anywhere. For a founder who's mobile, that's a non-starter.

Then there's the rejection rate. Roughly 20 to 35% of direct mail W-7 applications come back rejected for fixable but time-expensive errors (name mismatches, missing reason codes, notarized copies the IRS won't accept). When a CAA submits, the rejection rate drops to 5 to 10% because they verify everything before it leaves their office.

Reject from direct mail = restart the whole timeline. So $400 buys you: keep your passport, 4 weeks faster on average, and roughly a 4x lower rejection probability. For anyone running a business, the math isn't close.

Step-by-Step: W-7 Application Process

1. Determine eligibility. You need a US tax filing requirement or a qualifying Exception. Most foreign-owned single-member LLC owners file under Exception 1 (third-party reporting) or alongside a Form 1040-NR plus the mandatory Form 5472 and pro-forma Form 1120 package.
2. Complete Form W-7. The form asks for the reason for applying (check the right box, most LLC owners need "a" plus the relevant Exception number), legal name as it appears on your passport, foreign address, country of citizenship, date of birth, and passport details.
3. Gather supporting documents. Passport is the only single document that proves both identity and foreign status. Every other path requires two documents (see next section).
4. Attach the federal return or Exception documentation. For LLC owners filing under Exception 1, this is typically the partnership operating agreement plus EIN confirmation letter. For founders with actual US-source income, this is the completed Form 1040-NR.
5. Submit via your chosen route. CAA verifies in person or via video and files the Certificate of Accuracy with the IRS on your behalf.

Required Documents

The IRS accepts 13 different documents, but in practice there are two paths.

Passport-only path (recommended). A valid, unexpired passport is the only single document that satisfies both identity and foreign status. If you have a passport, use this path.

Two-document path. Without a passport, you submit two documents from the IRS's accepted list. National ID with photo, US or foreign driver's license, civil birth certificate, foreign voter's ID card, or USCIS photo ID. One must prove foreign status; one must establish identity.

The CAA route sidesteps this entirely. The agent verifies your passport in person or on a video call, then submits a Certificate of Accuracy to the IRS confirming they've seen the original. You never mail your passport anywhere.

Top 7 Rejection Reasons

The June 1, 2026 Rule Change for LLC Owners

Effective June 1, 2026, the IRS tightened CAA submissions under Exception 1(a) (partnership and multi-member LLC reporting). CAAs must now attach the portion of the partnership or LLC operating agreement that shows both the EIN and the applicant's name and signature.

What this means practically: your operating agreement needs to be properly drafted, signed, and dated before the W-7 goes in. A blank template or unsigned draft will trigger rejection under the new rule. If you formed your LLC quickly and skipped the operating agreement step, fix that first.

This doesn't affect single-member LLCs filing with a 1040-NR plus 5472, but it does affect the streamlined Exception 1 path that a lot of CAAs were using to skip the return requirement. Make sure your CAA knows which path they're filing under and has your operating agreement on file.

ITIN Renewal: When and How

An ITIN expires if it isn't used on a federal tax return for three consecutive years. If you let it lapse, you can't use it on a 1040-NR until you renew.

Renewal uses the same Form W-7, marked "Renew an existing ITIN." No tax return is required for renewal. Timeline through a CAA is roughly 7 to 11 weeks, same as a new application.

If you file Form 5472 plus pro-forma 1120 every year (which every foreign-owned single-member LLC must do, regardless of revenue), your ITIN doesn't lapse because the 5472 package counts as use. This is one more reason not to skip the 5472 filing.

How CAA Service Works (What You Pay For)

If you've never used a Certified Acceptance Agent, here's what the $400 to $500 buys you.

• Video or in-person passport verification. The CAA inspects your passport, confirms it's authentic and unexpired, and records the verification.
• W-7 preparation. They fill the form with the correct reason code, Exception number, and supporting documentation references. This is where most direct-mail applications fail.
• Certificate of Accuracy (COA). The CAA signs and submits a Form W-7 COA, a formal IRS document certifying they verified your identity and supporting documents. The IRS treats COA-backed applications differently from direct-mail submissions.
• IRS submission and tracking. They mail the package to the ITIN Operation in Austin, Texas, and track the application.
• Follow-up on issues. If the IRS sends a CP-566 (request for more information) or any notice, the CAA handles the response. This is the part founders underestimate. Solo founders responding to IRS notices in English about complex tax forms while running a business is where 20%+ of direct-mail applications die.