Switzerland Tax Residency (30-day and 90-day rules)

Key parameters
Threshold	30 days
Period / Window	Per visit
Counting	Any part of a day
Alternative	90 days, domicile

Switzerland has 2 separate routes into tax residency, and the day counts are only one of them.

The first is a qualified stay. You become resident by being in Switzerland for 30 days or more while carrying on gainful activity there, or 90 days or more without any. Gainful activity is read broadly — employment, self-employment, and remote work done from Switzerland for a foreign employer all count, which is what catches most people who assumed a foreign payroll kept them outside the system.

The second is domicile. Settling in Switzerland with the intention of staying makes you resident from the start, with no threshold to cross. This turns on your circumstances rather than a count, and it is the route that applies to anyone genuinely moving there.

Which threshold applies to you is decided by what you were doing, not by how you were paid. A stay of 40 days that includes any work is caught by the 30-day rule, while the same 40 days spent purely on holiday falls well short of 90.

• Remote work from a Swiss address counts as working there. The employer being foreign and the pay landing in a foreign account changes nothing, so a month of laptop work from a chalet can trigger the 30-day rule.
• Stays purely for study or medical treatment are excluded. Someone domiciled abroad who is in Switzerland only to attend an educational institution or receive treatment is not treated as resident on that basis.
• Cantons tax alongside the federal government. Residency is determined federally, but each canton levies its own income tax at its own rates, so where in Switzerland you stay affects the bill even though it doesn't change the test.
• Weekend trips out don't buy you a fresh count. Because temporary interruptions are disregarded, a pattern of leaving every few weeks accumulates rather than resetting.
• A lump-sum taxation regime exists for some new arrivals, agreed with a canton and based on living expenses rather than actual income. It changes how a resident is taxed, not whether the residency tests are met.

Residents are taxed on worldwide income and wealth, while nonresidents pay only on Swiss-source items, so an incorrect position usually surfaces as foreign income or assets left undeclared. Tax evasion under Swiss federal law is penalised with a fine calculated as a multiple of the tax evaded — normally around the amount of the tax itself, reduced to as little as a third where the fault is slight, and rising to as much as 3 times it in serious cases. Cantonal penalties apply alongside the federal ones. Professional tax advice is strongly recommended in situations like this.

A short assignment that still counts

You spend 5 weeks in Zurich working on a client project, paid throughout by your employer at home. That is 35 days with gainful activity, past the 30-day threshold, so you become a Swiss tax resident despite never intending to move.

A long holiday that stays outside

You rent a place in Verbier for the winter and are in Switzerland for 80 days, skiing and doing nothing else. With no gainful activity the 30-day rule doesn't apply, and 80 days falls short of 90, so you remain a nonresident.

Short trips out that don't reset anything

You spend 3 months in Geneva, leaving for a long weekend roughly every 3 weeks and assuming each return starts a fresh stay. Temporary interruptions are disregarded, so the days accumulate into one qualified stay well past both thresholds.

• OECD — Switzerland: information on residency for tax purposes
• Fedlex — Federal Act on Direct Federal Taxation (DBG)
• Swiss Federal Tax Administration — Individual taxation