Swiss tax residency: when you become (and stop being) tax-resident

You become tax-resident in Switzerland when you take up a Swiss tax domicile, meaning you live here with the intention of staying permanently, or when you stay here for at least 30 days while working or 90 days without working. There is no Swiss 183-day rule. You stop being tax-resident when both your domicile and your stay here end, although your former home country, or a treaty, may still have a say.

Key facts (as of September 2026)

How Swiss tax residency works

Swiss law talks about "unlimited tax liability" rather than "tax residency", but the idea is the same: once it applies, Switzerland taxes you on your worldwide income and wealth, subject to its double tax treaties. It arises in one of two ways (art. 3 DBG, mirrored for cantonal and communal tax in art. 3 StHG).

Tax domicile

You have a Swiss tax domicile when you live in Switzerland with the intention of staying permanently. It is about where your life is really centred, not about counting days. A family that moves here, rents or buys a home, enrols the children in school and brings the cars is typically domiciled from the start, even in the first week.

Authorities look at the facts. Swiss property law gives a useful picture of how they think: under Lex Koller, actual domicile must be proven, and a residence permit plus commune registration alone is not enough. Indicators include where the family household is, where cars are registered, where you are fully taxed and where you belong to clubs.

Tax stay

Without a domicile, you can still become fully taxable through a stay. The thresholds are:

• 30 days if you carry on a gainful activity in Switzerland
• 90 days without gainful activity

Short interruptions, such as a trip abroad, do not reset the count. Presence only to attend school or for treatment in a clinic does not create a tax stay (art. 3 para. 4 DBG).

Why the 183-day rule does not apply

Many people arrive expecting a "183-day rule". It is not part of Swiss domestic law. The number appears in double tax treaties, mainly in the article on employment income, and in the domestic rules of other countries. Relying on it in Switzerland can lead to an unpleasant surprise: a family that spends four months here each year in a home it treats as its own may be domiciled here, whatever the day count.

When two countries claim you

It is common for your old country to still treat you as resident in the year you move, or longer. Where both Switzerland and another state consider you resident, the tie-breaker in article 4 of the applicable double tax treaty decides. The usual order, based on the OECD model, is:

1. Permanent home. Where do you have a home available to you at all times?
2. Centre of vital interests. If you have a home in both, where are your personal and economic ties closer?
3. Habitual abode. Where do you spend more of your time?
4. Nationality. And, failing that, agreement between the two tax authorities.

This is the principle only. Each treaty has its own wording and protocols, so check the treaty that applies to you with an adviser in both countries.

The arrival year

The arrival year is usually a part year: before the move you were taxed elsewhere, after it in Switzerland. How income and wealth for a part year are assessed is set by federal and cantonal rules, and it is worth confirming with your canton in advance.

A few points are worth settling before you arrive:

• Lump-sum taxation. It is available only if you become subject to unlimited Swiss tax liability for the first time or after at least 10 years' absence (art. 14 DBG). Both spouses must meet the conditions, and neither may work in Switzerland. The amount is agreed with the canton before or on arrival. See Swiss lump-sum taxation.
• A ruling. A written ruling from the cantonal tax authority on your concrete situation gives you certainty before you commit. Our guide to getting a tax ruling before you move explains how.
• Your old country's exit rules. Some countries tax you on leaving or keep a claim afterwards. Germany's exit tax (§ 6 AStG) applies after at least 7 of the last 12 years of unlimited German liability for holdings of 1% or more. France's exit tax (art. 167 bis CGI) applies after 6 of the last 10 years of French tax domicile, for holdings of at least 50% of a company's profits or worth over €800,000. In the UK, long-term residents keep an inheritance tax tail of 3 to 10 years after leaving.

What changes once you are resident

Becoming Swiss-resident brings a set of new obligations and a few advantages:

• Worldwide income and wealth are declared in Switzerland (or covered by the lump-sum base if you are taxed that way).
• Wealth tax is cantonal and communal only; there is no federal wealth tax.
• Capital gains on private movable assets, such as securities, are tax-free at federal and cantonal level. Real-estate gains are taxed separately by the cantons.
• Swiss withholding tax of 35% on Swiss dividends and interest is refundable to residents who declare the income.
• Inheritance and gift tax are cantonal. Spouses are exempt everywhere and direct descendants in most cantons, with exceptions. See our guide to inheritance and gift tax.
• Social security. Non-employed residents generally pay AHV/AVS contributions based on wealth and pension income, until the reference age of 65.
• Health insurance. With a B or C permit you must take out basic cover within three months of registering with the commune (art. 7 para. 1 KVV).

Tax residency and your residence permit

A residence permit and tax residency are separate. The permit governs your right to live here; tax residency follows domicile or stay under tax law. In practice they usually go together, because people who move here on a permit take up a domicile. But a permit holder who keeps their real centre of life elsewhere may face questions both on renewal of the permit and on their tax position. For non-EU nationals on the retiree route, the centre of life must be in Switzerland or renewal is refused. The Swiss permits explained guide covers the permit side.

When you stop being tax-resident

Swiss unlimited liability ends when you give up your Swiss domicile and no longer have a qualifying stay. In practice, that means actually moving your life elsewhere: the home, the family household, the cars and the day-to-day ties. Deregistering from the commune is part of it, but on its own it is not the test.

Points to keep in mind when leaving:

• Returning later to a lump sum. People who were taxed on a lump sum before and come back may use it again, even within 10 years.
• Your new country's rules decide when you become resident there. Plan the departure date with advisers on both sides.

How we help

We look at your situation before you move, confirm when your Swiss tax liability will start, and help you secure a ruling so the arrival year holds no surprises. If you would like a first view of your options, start with the eligibility check, or see our tax ruling service.

This guide is general information as of 30 September 2026 and is not legal or tax advice; your tax residency and any ruling should be confirmed for your specific situation.