Tax residence in Switzerland for U.S. citizens and green card holders

Switzerland treats you as a tax resident if you have your tax domicile there or stay at least 30 days while working (90 days without work). Federal, cantonal and communal taxes apply. U.S. citizens remain taxable in the United States; the U.S.–Switzerland treaty settles dual residence.

Check your status: United States and Switzerland

Free, no sign-up, about 3 minutes. Conclusion under U.S. law, compared with the law of Switzerland and the tax treaty.

When Switzerland treats you as a tax resident

Switzerland treats you as resident if you have a tax domicile there (Wohnsitz: a home with the intention of staying, the centre of your life) or, already, if you stay 30 days while working or 90 days without working.

A home and family in Switzerland establish a tax domicile (Wohnsitz): you are a Swiss resident with unlimited tax liability (federal, cantonal and communal income taxes on worldwide income).
You stayed in Switzerland at least 30 days while working (or 90 days without working) — a tax stay (Aufenthalt): you are a Swiss resident from the first day of your stay.

When you are a nonresident

A stay solely for study or medical treatment does not create Swiss residence (Art. 3(4) DBG).
The 30/90-day thresholds are not met and you have no Wohnsitz — you are not a Swiss resident. Salary for work physically performed in Switzerland is taxed there if a Swiss employer or a Swiss permanent establishment pays it (tax at source). With a non-Swiss employer, Art. 15(2) of the U.S.–Switzerland Convention applies (183 days in any twelve-month period).

Where the rules of Switzerland clash with U.S. tax rules

Dual residence: Switzerland and the United States both tax you as a resident. Switzerland taxes you on worldwide income as a resident, and the United States taxes you as a U.S. person. The tie-breaker in Art. 4(3) of the Convention (permanent home → centre of vital interests → habitual abode → nationality → mutual agreement) decides treaty residence. If you are a U.S. citizen, the saving clause (Art. 1(2)) lets the U.S. keep taxing you as if there were no treaty, even if the tie-breaker points to Switzerland; double tax is relieved under Art. 23(3): Switzerland relieves only the U.S. tax a non-citizen would pay on U.S.-source income, and the U.S. credits the remaining Swiss tax, treating the income as Swiss-source to the extent needed. If you are a green-card holder or substantial-presence resident (not a citizen) and the tie-breaker assigns you to Switzerland, the saving clause does not apply to you as a resident (Art. 1(2) carve-out); the U.S.-law consequences of claiming this are covered in the U.S. section.
Switzerland treats you as resident after 30 or 90 days. Switzerland needs only 30 days of presence while working (90 without), even with temporary interruptions — far below the U.S. 183-day logic. Under Art. 4(3) of the Convention a hotel or other temporary accommodation is not a permanent home: if your only permanent home is in the United States, you remain a U.S. resident for treaty purposes, and Switzerland may then tax your Swiss-workday salary only under Art. 15 (more than 183 days in any twelve-month period, or a Swiss employer / permanent establishment).
Family in Switzerland. For Switzerland, married persons have their Wohnsitz where the joint family home is. If you have a permanent home in both countries, Art. 4(3)(a) of the Convention looks to the centre of vital interests — and a family living in Switzerland pulls it there. For U.S. citizens this changes treaty residence, not U.S. tax liability (saving clause, Art. 1(2)).

What else to know

Year of arrival or departure: Switzerland taxes from the day you arrive. Swiss liability runs from the day you acquire Wohnsitz or Aufenthalt until you leave (pro rata), with the rate set on annualised income. The United States taxes citizens for the full calendar year regardless of where they live.
Tax at source (Quellensteuer) for B- and L-permit holders. As a U.S. national you will normally hold a B (residence) or L (short-term) permit rather than a C (settlement) permit, so a Swiss employer withholds income tax at source from your salary. With gross income of CHF 120,000 or more an ordinary assessment (tax return) is mandatory; below that you can request one by 31 March of the following year, irrevocably. If your employer has no seat or permanent establishment in Switzerland (e.g. a U.S. employer while you work remotely from Switzerland) and no Swiss establishment bears the salary, nothing is withheld and you are taxed by ordinary assessment. Keep Swiss tax assessments and payment records: you need them to claim the U.S. foreign tax credit.
Salary for work in Switzerland while you are a U.S. treaty resident. If the tie-breaker makes you a U.S. resident, Switzerland may tax salary for work physically performed in Switzerland only if you are present there more than 183 days in any twelve-month period, or the employer is Swiss-resident, or a Swiss permanent establishment bears the cost (Art. 15(2)). The United States then credits the Swiss tax.
Swiss lump-sum taxation (Pauschalbesteuerung) and the U.S. treaty. Non-Swiss nationals moving to Switzerland for the first time (or after 10 years away) who do not work in Switzerland can, in most cantons, be taxed on their living expenses instead of income and wealth (federal minimum base CHF 434,700 for 2025, or seven times annual rent if higher). Zurich, Basel-Stadt, Schaffhausen and Appenzell Ausserrhoden do not offer it. Under Art. 4(5) of the U.S.–Switzerland Convention, a person who elects not to be subject to the generally imposed Swiss income taxes on all U.S.-source income is not a Swiss resident for treaty purposes — so no treaty benefits; to keep them, the U.S.-source income must be included in the Swiss base (Art. 14(5) DBG). Lump-sum taxation does not change U.S. taxation of a U.S. citizen's worldwide income; whether and how much of the Swiss lump-sum tax is creditable in the U.S. was not verified here — take advice before choosing it.
Social security: U.S.–Swiss totalization agreement. A U.S.–Swiss social security agreement (signed 3 December 2012, effective 1 August 2014) prevents paying into both AHV/IV and U.S. Social Security for the same work. Self-employed persons are covered in the country where they reside. To be exempt from one system you need a certificate of coverage (for Swiss employers: form CH/USA 10 from the Swiss compensation fund). Social security contributions are outside the income tax treaty.
Cantonal and communal tax dominate. Swiss residence is determined by the same criteria for federal, cantonal and communal tax, but most of the income tax burden is cantonal and communal, and rates differ widely between cantons and municipalities.

How dual residence is resolved

If both countries treat you as a resident, Art. 4(3) of the treaty applies: Convention between the United States of America and the Swiss Confederation for the avoidance of double taxation with respect to taxes on income (signed 2 October 1996). The tests are applied in order — permanent home, center of vital interests, habitual abode, nationality, and finally mutual agreement between the tax authorities. U.S. citizens remain taxable in the United States under the saving clause.

Terms you will come across in Switzerland

steuerrechtlicher Wohnsitz: tax domicile — where you live with the intention of staying
Aufenthalt: tax stay — 30 days with work or 90 days without
Quellensteuer: tax withheld at source from wages of foreign workers without a C permit
Pauschalbesteuerung: lump-sum (expenditure-based) taxation for certain foreign nationals not working in Switzerland
Ansässigkeitsbescheinigung: certificate of tax residence
ESTV: Swiss Federal Tax Administration

Questions

I am a U.S. citizen — do I still pay U.S. tax if I live in Switzerland?

Yes. The United States taxes its citizens on worldwide income wherever they live, and the treaty keeps that right through the saving clause (Art. 1(2)–(3)). You file Form 1040 every year; double taxation is relieved mainly by the foreign tax credit (Form 1116) or the foreign earned income exclusion (Form 2555), plus the treaty's relief article (Art. 23).

Which treaty applies between the U.S. and Switzerland?

The Convention signed on 2 October 1996 (in force 19 December 1997), with the 2009 Protocol in force since 20 September 2019. The tie-breaker is in Art. 4(3).

Can an American use Swiss lump-sum taxation?

Lump-sum (expenditure-based) taxation is available to foreign nationals who do not work in Switzerland, but not in every canton. Under Art. 4(5) of the treaty a person who is not taxed in Switzerland on U.S.-source income in the ordinary way is not treated as a Swiss resident for the treaty.

Sources

Legislation and official guidance

Art. 3 DBG (SR 642.11) — Unlimited tax liability applies to anyone with a Swiss tax domicile (Wohnsitz: staying with the intention of settling permanently) or tax stay (Aufenthalt): at least 30 days with gainful activity or 90 days without, regardless of temporary interruptions. A stay solely for study or medical treatment does not create residence.
Art. 3 StHG (SR 642.14) — Cantons and municipalities apply the same criteria (Wohnsitz; 30/90 days). Most of the income tax burden is cantonal and communal tax.
Art. 83, 89, 91 DBG — Foreign employees without a settlement permit (C permit) — e.g. holders of B or L permits — who have Wohnsitz or Aufenthalt in Switzerland pay tax withheld at source (Quellensteuer). With gross income of CHF 120,000 or more, or income not subject to withholding, an ordinary assessment follows.
Art. 15(2) U.S.–Switzerland Convention (1996) — Employment income of a resident of one state for work in the other state is taxable only in the residence state if the employee is present in the other state not more than 183 days in aggregate in any twelve-month period, the employer is not a resident of the other state, and the pay is not borne by a permanent establishment or fixed base there.
Art. 4(3) U.S.–Switzerland Convention (1996) — Dual-resident individuals: permanent home → centre of vital interests (closer personal and economic relations) → habitual abode → nationality → mutual agreement of the competent authorities.
Art. 1(2), (3) U.S.–Switzerland Convention (1996) — Saving clause: the United States may tax its citizens (including former citizens) as if the Convention had not come into effect. It may also tax persons treated as U.S. residents under U.S. law, except where such a person is determined to be a resident of Switzerland under Art. 4(3) or (4). Exceptions in para. 3 preserve, among others, Art. 23 (relief), 24 (non-discrimination) and 25 (mutual agreement).
Art. 23(1)(a), (2), (3) U.S.–Switzerland Convention (1996) — Switzerland generally exempts income the U.S. may tax under the Convention, with progression. The U.S. credits Swiss income tax for its citizens and residents. For a U.S. citizen resident in Switzerland (para. 3): Switzerland gives relief only for the U.S. tax a non-citizen would pay on U.S.-source income; the U.S. credits the Swiss tax paid after that relief, without going below that amount; the income is deemed to arise in Switzerland to the extent needed (re-sourcing).
Art. 8, 40 DBG — Liability begins on the day Wohnsitz or Aufenthalt is acquired and ends on departure; in a partial year only income for that period is taxed (pro rata).
ESTV, Circular No. 45 (12.06.2019) — Tax at source is withheld only by a payer with its seat or a permanent establishment in Switzerland; where there is no such payer, nothing is withheld and the income is taxed by ordinary assessment (sections 2.2.1, 3.2.1).
Art. 4, 9, 10 QStV (SR 642.118.2) — Salary from an employer not resident in Switzerland is taxed by ordinary assessment, not at source, unless a Swiss permanent establishment bears it (Art. 4). Ordinary assessment is mandatory from CHF 120,000 of income (Art. 9); below that it can be requested by 31 March of the following year, irrevocably (Art. 10).
Art. 14 DBG; ESTV Steuermäppchen 2025 «Besteuerung nach dem Aufwand» — Lump-sum taxation (taxation according to expenditure) is available only to persons who are not Swiss citizens, become subject to unlimited Swiss tax liability for the first time or after at least ten years' absence, and have no gainful activity in Switzerland (spouses must both qualify). Federal minimum base for 2025: CHF 434,700 or seven times the annual rent/rental value, whichever is higher; a control calculation applies. Zurich, Basel-Stadt, Schaffhausen and Appenzell Ausserrhoden do not offer it; Basel-Landschaft only transitionally. Where a treaty requires it, the base is extended to treaty-state income (Art. 14(5) DBG).
Art. 4(5) U.S.–Switzerland Convention (1996) — An individual who would be a Swiss resident but elects not to be subject to the generally imposed Swiss income taxes on all income from U.S. sources is not considered a resident of Switzerland for the purposes of the Convention.
SSA — Status of totalization agreements — Switzerland: Agreement on Social Security of 3 December 2012, effective 1 August 2014, replacing the 1979 agreement and its 1988 supplement.
U.S.–Switzerland Social Security Agreement (signed 3 Dec 2012, effective 1 Aug 2014) — Totalization agreement replacing the 1979/1988 agreements (SSA status table). Self-employed persons are covered where they reside; an exemption from one country's contributions requires a certificate of coverage (form CH/USA 10 from the Swiss compensation fund for U.S. coverage exemption).
Art. 4(3)(a) of the Convention — A dual-resident individual is deemed a resident of the state in which he has a permanent home available to him; if he has a permanent home in both states, of the state with which his personal and economic relations are closer (centre of vital interests).
Art. 4(1)(a) U.S.–Switzerland Convention (1996) — A U.S. citizen or green-card holder who is not a Swiss resident is a U.S. resident for treaty purposes only if he or she has a substantial presence, permanent home or habitual abode in the United States; if also a Swiss resident, status is decided under Art. 4(3).
Art. 4(3)(b) of the Convention — If the centre of vital interests cannot be determined, or there is no permanent home in either state, the individual is a resident of the state in which he has an habitual abode.
Art. 4(3)(c), (d) of the Convention — Habitual abode in both states or in neither: resident of the state of which he is a national; national of both or neither: the competent authorities settle the question by mutual agreement.

Case law

Federal Supreme Court of Switzerland (Bundesgericht), 2C_480/2019, 2020-02-12 — Tax domicile (Wohnsitz) is where a person stays with the intention of remaining permanently and which has become the centre of their life interests; a flat abroad without evidence of actual living there and a postal address do not prove a move of that centre; Wohnsitz normally requires a horizon of at least one year.
Federal Supreme Court of Switzerland (Bundesgericht), 9C_496/2023 (BGE 150 II 244), 2024-02-29 — A transfer of Wohnsitz is recognised if, overall, the ties to the new place are more important, even if a Swiss home is kept. Wohnsitz normally requires an intended stay of at least one year, and an intention to move on later does not exclude it. In international cases the family's place of residence does not automatically prevail.
Federal Supreme Court of Switzerland (Bundesgericht), 9C_702/2024, 2026-01-13 — Tax domicile follows the objective centre of life interests, not registration: a room without a signed lease, rent paid in cash and no evidence of moving while the former home is kept point to a fictitious residence; refusal to produce documents may be held against the taxpayer. (Inter-cantonal dispute; same criteria as Art. 3 DBG.)
Federal Supreme Court of Switzerland (Bundesgericht), 2C_398/2021, 2021-12-23 — Married taxpayers normally have their Wohnsitz at the place of the joint family home (Familienort).
Federal Supreme Court of Switzerland (Bundesgericht), 2C_186/2020, 2020-12-28 — The tax stay (Aufenthalt) ended on departure, so liability applied pro rata for part of the year, not for the whole year.
Federal Supreme Court of Switzerland (Bundesgericht), 2C_128/2016, 2C_130/2016, 2017-04-07 — In a dual-residence situation with homes in both states, the burden of proving a transfer of Wohnsitz lies with the taxpayer.

Updated 2026-11-04. The result is for information only and is not tax or legal advice. Tax authorities and courts may interpret the rules differently, including because of circumstances not covered here, and the law changes. Consult a qualified adviser before making decisions.

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