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Tax
Steuererklärung
Tax Declaration
Simple Definition
The annual tax return form you must file (if C-Permit or >120k income).
Why this matters to Expats.
Due by March 31st (but extensions to Sept are easy/free in most cantons). Switzerland allows massive deductions (Lunch, Commute, 3a, Debt Interest, Medical, Education). If you don't claim them, you lose money.
Actionable Intelligence
Deadline Extension: You can usually extend the deadline online in 2 minutes. Do it if you are late to avoid fines.
Software: Use the official cantonal software (e.g. ZHprivateTax, eTax). It guides you well.
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