Reviewed & Updated September 2026
EIN for Portuguese LLC Owners: Complete 2026 Application Guide
How Portuguese founders get a US tax ID, and the passive-income threshold that decides whether Portugal's CFC rules apply
Quick Summary
- Country
- Portugal
Fax and mail if you can't call
Fax reaches 855-215-1627 (from the US) or 304-707-9471 (from outside); mail routes through the Cincinnati service center. Both now typically run 4-6 weeks. The phone route remains dramatically faster in almost every case.
What an EIN unlocks for your LLC
An EIN (Employer Identification Number) is the nine-digit federal tax ID the IRS assigns to your US LLC. Without it, no US bank will open a business account, no payment processor will verify your business, and no annual return can be filed. This has nothing to do with your Portuguese NIF — it identifies the company, not you.
The phone application from Portugal
Call the IRS International EIN line at 267-941-1099, open 6am-11pm US Eastern Time. This line accepts calls from Portugal without issue — it exists precisely for foreign applicants without a US SSN or ITIN. Budget 45-60 minutes for the full call including hold time. You'll confirm your entity's legal name, formation state and date, a short business purpose, and your name and Portuguese address as the responsible party, receiving your EIN verbally before the call ends.
The ownership threshold for individuals
The minimum participation threshold is 10% of share capital or voting rights for Portuguese resident taxpayers, when at least 50% of the entity's capital is held collectively by Portuguese residents. A single-member LLC owner clears this threshold automatically at 100% ownership.
The two conditions that must both be met
A foreign entity only counts as a CFC under Portuguese rules if two things are true: its home jurisdiction is on Portugal's tax haven blacklist, or its effective tax rate is below 50% of the Portuguese corporate rate (currently under roughly 10.5%, since the standard Portuguese corporate rate is 21%) — and separately, its passive income (royalties, dividends, financial leasing income, gains from share sales, interest, and similar low-value-add income) exceeds 25% of its total income. If passive income stays under that 25% threshold, the CFC rules don't apply even if the tax-rate condition is met.
Line 7b: what to write instead of your NIF
Form SS-4's Line 7b asks for the responsible party's SSN, ITIN, or EIN. As a Portuguese applicant, you write "Foreign" or "N/A" — the standard, expected entry that won't delay your application.
Protecting your CP 575 confirmation letter
A CP 575 letter arrives by mail a few weeks after your call. If lost, the IRS won't reissue the original, but calling the same EIN line gets you a 147C verification letter, accepted everywhere a CP 575 would be.
The passive-income test as your most useful check
Given the ambiguity around the tax-rate condition, the passive-income threshold is often the more reliable thing to check first: if your LLC runs an active business — consulting, e-commerce, software, agency services — rather than holding investments or licensing IP, its passive income is likely well under 25% of total revenue, which would rule out CFC treatment regardless of how the tax-rate question resolves.
Why the disregarded-entity question matters here too
The United States isn't on Portugal's tax haven blacklist, so the alternative trigger — the effective-tax-rate test — is what typically matters for a US LLC. A single-member disregarded LLC generally pays no US corporate-level tax itself, since income passes through to the owner. Whether Portuguese authorities would treat this 0% entity-level rate as satisfying the below-10.5% condition, given the pass-through structure, isn't consistently addressed in public guidance and is worth confirming directly with a Portuguese tax advisor rather than assuming either way.
Portugal's CFC rules (Article 66 CITC) and who they cover
Portugal's CFC regime, set out in Article 66 of the Corporate Income Tax Code and aligned with the EU's Anti-Tax Avoidance Directive, explicitly extends to individual resident shareholders, not just corporate ones. Income or gains from a qualifying non-resident entity are treated as belonging directly to the Portuguese resident and are taxable regardless of whether any distribution actually occurs.
The $25,000 US filing requirement, separate from your Portuguese CFC analysis
Regardless of how the CFC question resolves for your LLC, US rules independently require an annual Form 5472 alongside a pro forma Form 1120 for any foreign-owned single-member LLC, generally due April 15 (or October 15 with an extension). Missing this filing triggers a minimum $25,000 penalty per year regardless of profitability, and it requires the EIN to already be issued.
Requirements
| Requirement | Needed |
|---|---|
| US Social Security Number | |
| ITIN | |
| LLC formation documents | |
| Responsible party's Portuguese address | |
| US registered agent address |
Costs
| Item | Cost |
|---|---|
| EIN Priority (bundled with Global Launch formation) | $99 |
| EIN Follow-up (LLC already formed) | $129 |
| DIY phone application | $0 (your time only) |
Who Should Choose
DIY phone application
Free, and manageable if you're comfortable with a 45-60 minute international call.
EasyBrise EIN Follow-up ($129)
For founders whose LLC is already formed and want the IRS call handled for them.
EasyBrise EIN Priority ($99, bundled)
For founders forming their LLC now who want the EIN done in the same workflow.
Comparison
| Method | Who Can Use It | Typical Time |
|---|---|---|
| Phone (267-941-1099) | Any foreign responsible party | 45-60 minutes |
| Fax | Foreign or US applicants | 4-6 weeks |
| Foreign or US applicants | 4-6 weeks | |
| Online IRS tool | US-based SSN/ITIN holders only | Not available to most Portuguese founders |
Banking
Mercury
Popular with non-resident founders; requires US LLC + EIN; no US visit needed
Relay
Remote-friendly for non-residents; requires formed US entity
Frequently Asked Questions
More guides for founders in Portugal
Or browse all formation guides by country.
Reviewed by EasyBrise Research Team · Updated September 2026
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