Tax preparation · Source-backed planning

Swiss tax return: prepare your documents and questions

Prepare a clean evidence folder and a short list of unresolved questions before opening the cantonal filing tool. This checklist organises information; it does not determine whether you must file or which deductions you qualify for.

Your working checklist

Tick items for this visit or print a copy. This public checklist does not save your answers.

1. Identify the correct process and yearKeep the authority's notice and access instructions. If you are unsure whether a return or another procedure applies, ask the cantonal tax authority before treating this list as your filing obligation.
2. Collect income evidenceGather relevant salary certificates and statements for other income. Use the official guidance to check what is relevant to your situation and tax year.
3. Collect asset and account statementsPrepare bank, investment and other applicable asset evidence. Reconcile missing statements before filing rather than estimating from a current account balance.
4. Keep possible-deduction evidence separateOrganise pension contribution confirmations and evidence for relevant work, childcare, training, donation or other expenses. Having a receipt does not by itself establish deductibility; apply the cantonal instructions.
5. Review, submit and retain the acknowledgementResolve uncertain items with the authority or a qualified adviser. Save the submitted version, receipt and any follow-up request in your own secure records.

A document inventory without uploading documents

Mark which evidence is ready, requested or still unclear. CH/OS can keep your administration actions and reminders locally; original tax documents should remain in your own secure storage.

One calendar date is not a Swiss-wide rule

Do not reuse a deadline from a friend, an old return or a different canton. Confirm the date and any extension process for the specific notice and procedure that applies to you.

Evidence and scope

Check the official source

Sources consulted on 23 October 2026. Follow the responsible authority for current requirements and individual decisions. CH/OS provides educational planning support, not legal, tax, insurance or investment advice.

ch.ch: preparing a tax return (opens a new tab)

Swiss tax return: prepare your documents and questions

Your working checklist

A document inventory without uploading documents

One calendar date is not a Swiss-wide rule

Check the official source

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