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Checklist
Key dates in Switzerland
30 Sep Usual deadline to cancel or change your supplementary insurance (varies by insurer).
30 Nov Last day to change your basic health insurance, its model or deductible for next year (notifying the insurer).
Nov–Dec Pillar 3a contribution: the legal deadline is 31 December, but some banks close earlier (in November).
Feb–Apr Tax return deadline: varies by canton (some as early as February), extension possible.
Monthly Most bills are paid monthly, sometimes in advance. Keep them organised.