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| However, I was working in Switerland only 3 months in 2020, so my total gross income would be 24'000 CHF per year which would make the average tax rate just 9.2% for the canton Zurich.
Or did I make some mistake in my calculation? | |
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Typical rookie mistake. If you have been a Swiss resident for only part of the year the tax rate determining income is extrapolated to the full year.
If you have been a Swiss resident also for 3 months than the tax rate is correct.