Taxes in Switzerland

Tax at source (Quellensteuer / impôt à la source)

If you hold a B or L permit and are a salaried employee, you generally don't file a traditional tax return: your employer withholds tax directly from your paycheck each month, at a rate combining federal, cantonal and municipal tax, depending on your canton of residence, your salary, your marital status, and the number of children you have.

When you switch to ordinary taxation

• If you obtain a Permit C (settlement)
• If your gross annual salary exceeds a threshold (varies by canton, roughly around CHF 120,000–140,000)
• If you marry someone with Swiss nationality or a Permit C
• If you have other significant income sources (property, substantial self-employment activity)

Can you deduct expenses even under tax at source?

Yes. If you have significant deductible expenses the standard withholding doesn't account for (voluntary contributions to your private pension — pillar 3a, education costs, alimony, dependents living outside Switzerland, etc.), you can request a "correction" or "taxation ordinaire ultérieure" within the annual deadline (usually before March 31 of the following year) to recalculate your actual tax burden.

Why the canton changes your final bill so much

Switzerland has a very decentralized tax system: each canton (and each municipality within it) sets its own rates. The same salary can be taxed substantially differently between, say, Zug or Schwyz (low taxation) and Geneva or Vaud (higher taxation). Check the cantons comparison before deciding where to settle if your take-home pay is a priority.