Life in Switzerland

• Three levels of tax
  Income is taxed at the federal, cantonal, and municipal levels. Total tax varies a lot depending on where you live (e.g. Zug and Schwyz are generally lower, while Geneva and Vaud are higher).
• Withholding at source
  If you hold a B permit (and aren't yet a C permit holder or Swiss citizen), tax is typically deducted directly from your salary. The rate depends on your canton, marital status, children, and sometimes religion.
• When you file a return
  Higher earners (roughly above CHF 120,000 gross per year) are usually required to file an ordinary tax return even if taxed at source. Others may be able to request one, which can be worthwhile if they have deductions to claim. C permit holders and citizens file annually.
• Filing deadlines
  The tax year is the calendar year, and returns are commonly due around 31 March, though this varies by canton, and extensions are usually available.
• Wealth tax
  Unlike Singapore, Switzerland levies an annual cantonal tax on net wealth, and you generally need to declare worldwide assets, including Singapore bank accounts, investments, and property.
• Church tax
  In many cantons, this applies if you register as a member of a recognised church. Singaporeans of other or no religion typically aren't affected, but make sure your registration is accurate.
• Deductions
  Contributions to the Pillar 3a private pension, certain pension fund buy-ins, health insurance premiums (within limits), and commuting costs are commonly deductible.
• Capital gains
  Gains on private investments are generally not taxed, though dividends, interest, and rental income are.
• Double taxation
  Singapore and Switzerland have a double taxation agreement, which helps avoid being taxed twice on the same income. It's also worth checking your Singapore tax residency status with IRAS when you move.