US citizens in Switzerland: the complete money guide

Almost every country taxes on residence. The United States is one of the very few that taxes on citizenship. That single difference is the root of everything in this guide: from the day you land in Zurich you are a Swiss taxpayer and you remain a US taxpayer, filing two returns, reconciling two currencies and two tax years, and navigating rules that were not designed to work together.

The good news is that double taxation is largely avoidable through the foreign tax credit and the US-Swiss treaty network. Double filing is not. And several perfectly ordinary Swiss financial products - the local ETF, the fund-based pillar 3a, the employer pension - carry US tax consequences that a Swiss adviser without US expertise will not flag.

Our US persons page covers how we work alongside your US tax adviser on the Swiss side.

Two details cause most of the trouble. The automatic two-month extension to 15 June for Americans abroad postpones the filing, not the payment: interest still runs on any tax owed from 15 April (irs.gov). And the FBAR goes to FinCEN, not the IRS, so it is easy to file a perfect 1040 and still miss a reporting obligation entirely.

Note also what counts as an account. Swiss pillar 3a accounts and vested benefits accounts are foreign financial accounts for FBAR purposes (indicative), and they count towards the USD 10,000 aggregate together with your everyday salary account. Most US persons in Switzerland cross that line in their first year.

The foreign earned income exclusion (Form 2555) excludes up to USD 130,000 of foreign earned income for 2025, rising to USD 132,900 for 2026 (Rev. Proc. 2024-40 and 2025-32; irs.gov). It is simple and effective at modest income levels, but it excludes income rather than offsetting tax, which has side effects.

The foreign tax credit (Form 1116) instead credits the Swiss income tax you actually paid against your US liability. For many US persons in Switzerland this works better: Swiss federal, cantonal and communal tax on a higher income frequently exceeds the US tax on the same income, leaving nothing to pay and excess credits to carry forward. Because the income is not excluded, it also remains eligible income for IRA contributions.

It is not automatic, though. In a genuinely low-tax canton such as Zug, Swiss tax may not fully cover the US liability, and the calculation turns on your commune, income level and family situation. Two warnings: revoking the FEIE generally locks you out of it for five years without IRS consent, and mixing the two methods on the same income requires care. Model both before choosing, ideally once, properly, in your first Swiss tax year.

UCITS ETFs, Swiss-domiciled funds and Luxembourg SICAVs are all Passive Foreign Investment Companies for US tax purposes. The default regime taxes excess distributions and gains at top ordinary income rates and adds an interest charge as if the income had been earned over the holding period, plus a separate Form 8621 for every single fund you hold (irs.gov). The elections that soften this - QEF or mark-to-market - usually require reporting most European funds simply do not provide.

The trap is easy to fall into because Swiss banks recommend Swiss products. It also reaches into retirement saving: fund-based pillar 3a solutions at banks and fintech providers invest through exactly these vehicles (indicative), so a US person who signs up for a securities-based 3a can acquire a portfolio of PFICs without ever seeing the word.

The practical answer most US persons in Switzerland use is straightforward: US-domiciled ETFs held through a brokerage that accepts US persons resident in Switzerland, and cash-based rather than fund-based pillar 3a. See our ETF investing guide and pillar 3a guide, and check any product with your US adviser before funding it.

Unlike some other treaties, the US-Swiss agreement gives no unambiguous answer on occupational and private pensions, and positions vary between advisers (indicative). The common conservative approach treats employer pillar 2 contributions, and sometimes the growth inside the fund, as currently taxable US income rather than deferred. On pillar 3a, the conservative position is that it receives no US deduction and is treated as an ordinary taxable investment account - with additional PFIC complications if it is fund-based.

What this means in practice is that the Swiss tax deduction you earn on a 3a contribution or a pension buy-in may not carry over to the US side at all. That does not make them bad decisions, since the Swiss saving is real, but it does mean the net benefit is smaller for you than for your Swiss colleagues, and it should be calculated rather than assumed.

Social security is clearer. The US-Switzerland totalization agreement prevents double social security contributions, with a certificate of coverage covering postings of up to about five years (indicative), and allows credits earned in both systems to be combined when testing eligibility for benefits (ssa.gov). You still only receive each country's own pro-rata benefit.

FATCA obliges foreign financial institutions to identify and report US account holders, and a large number of Swiss banks decided the compliance burden was not worth the business. As of 2025/26 the practical picture is (all indicative, because policies change without notice): PostFinance and UBS routinely open everyday accounts for US persons resident in Switzerland; some cantonal banks such as ZKB accept them with conditions or additional fees; and many retail banks and most private banks decline.

Always confirm directly, and confirm the specific service. A bank may open a salary account while refusing a securities account, a mortgage or a 3a solution to the same client. Ask about all four up front rather than discovering the limits when you need a mortgage.

One structural change is coming: Switzerland is expected to move from FATCA Model 2 to Model 1, so that data flows through the Swiss Federal Tax Administration rather than directly from each bank, indicatively from 2027. That should reduce the per-bank burden over time, and may gradually widen access for US clients.

Federal filing is only half the story. Certain states - California, Virginia, South Carolina and New Mexico are the usual examples (indicative) - continue to treat you as a resident after you move abroad unless you have clearly severed your ties. The test is factual, not a form you tick.

What tends to matter: your driver's licence, voter registration, property you retain and how it is used, where your family lives, and whether you kept a permanent address available to you. A clean exit means addressing these deliberately, ideally before or shortly after the move, and keeping the evidence.

Get this wrong and you can end up filing a state return, and paying state tax, on Swiss income for years - a bill no foreign tax credit will help with. Our cross-border guidance for US persons sets out how we coordinate the Swiss side with your US adviser.