EIN for Swiss LLC Owners: Complete 2026 Guide

With an EIN in hand, Mercury and Relay both currently accept Switzerland-based applicants for remote US business bank account opening without country-level restrictions. From there, EIN plus bank account is what unlocks Stripe, PayPal, and most US payment processors. Given how unsettled the transparent-versus-opaque question remains, it's worth getting your specific cantonal tax authority's position confirmed in writing (a tax ruling request is common practice in Switzerland) rather than assuming either classification by default.

If a live call doesn't suit your schedule, fax your completed SS-4 to 304-707-9471 (the line for applicants outside the US) and expect your EIN confirmation in 4 to 6 weeks. Mail to the IRS's Cincinnati processing center is also available but adds international transit time on top of the same 4-6 week window.

Once your EIN arrives, a foreign-owned single-member LLC that's disregarded for US federal tax purposes must file an annual pro-forma Form 1120 together with Form 5472, disclosing transactions between the LLC and its Swiss owner. This is purely informational when there's no US-source income, but the penalty for a missed Form 5472 starts at $25,000 minimum, regardless of whether any tax was owed - and it applies no matter how Switzerland ultimately classifies your LLC.

The fastest EIN route is the IRS's international applicant line, 267-941-1099, open Monday through Friday, 6:00 AM to 11:00 PM Eastern Time - corresponding to Swiss afternoon and evening hours given the roughly 6-hour time difference. Have your completed Form SS-4 ready: LLC legal name, formation state and date, responsible party's name and passport number (no US SSN or ITIN needed), and a short business-purpose description. Budget 45 to 60 minutes for the full call including hold time and the live SS-4 walkthrough with the IRS agent.

A US LLC gives Swiss founders a fast, globally recognized entity for billing international clients, selling through US marketplaces, or running a SaaS product - without the cost and formality of a Swiss GmbH or AG. But the LLC only becomes functional once it has an Employer Identification Number (EIN): without one, you can't open a US bank account, can't onboard Stripe or PayPal, and can't file the annual US paperwork the LLC owes regardless of US-source income.

Switzerland is one of the very few developed economies with no controlled foreign company legislation whatsoever. Undistributed income of a foreign entity is simply not attributed back to a Swiss owner under any CFC-style mechanism, regardless of how low the entity's effective tax rate is. For a Swiss founder holding a US LLC that pays 0% federal tax by default, this removes an entire category of tax exposure that founders in most other European countries have to model carefully.

The absence of CFC rules doesn't mean the LLC's income is invisible to Swiss tax authorities - it means the timing depends on classification rather than automatic attribution. Ordinary Swiss income tax still applies to distributions or draws you actually take from the LLC. What genuinely differs from a CFC-heavy jurisdiction is that there's no separate mechanism forcing you to report the LLC's retained, undistributed profits as deemed income before you've taken the money out.

Where Switzerland gets genuinely complicated is entity classification. Swiss tax law, under Article 49 paragraph 3 of the Federal Direct Tax Act, requires foreign entities to be qualified as either transparent (like a partnership) or opaque (like a corporation) for Swiss tax purposes - and a US LLC's hybrid nature makes this a famously unsettled question. The LLC combines liability protection like a corporation with, by default, US tax transparency like a partnership. Swiss cantonal tax authorities (through SSK practice notes), individual cantons, and the Swiss Federal Court have all weighed in over the years without producing one clean, universally applied rule - a 2016 Federal Court ruling notably went against treating a specific LLC as hybrid, but the classification still depends heavily on the LLC's actual operating agreement and the specific canton involved.

If your US LLC is treated as transparent for Swiss purposes, its income is attributed to you as it's earned, similar to a partnership - taxed whether or not you've distributed anything. If it's treated as opaque, you're generally only taxed on amounts actually distributed as dividends, much like owning shares in a foreign corporation. Because Switzerland has no CFC rules to fall back on for undistributed income either way, getting this classification right with your specific canton determines the actual timing of your Swiss tax liability - not a small detail.