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Tax return checklist: how to prepare your tax return properly

All the documents, steps and tips you need to submit your tax return completely, correctly and without stress.

19 January 2024 by Rodolfo Intaglietta
Last updated: 13 October 2026
10 min

Key facts about this article

Summary

This tax return checklist shows you step by step how to prepare your tax return in Switzerland properly. You will learn which documents are needed, how to proceed in a structured way and which mistakes you should avoid.

What you will learn:

  • Which documents are required for the tax return
  • Links to all cantonal tax offices
  • How to prepare your tax return efficiently and completely
  • Which typical mistakes often lead to queries or corrections
  • When it makes sense to have your tax return checked by a professional

Prerequisites

  • Tax liability in Switzerland
  • Income from employment, self-employment, assets or investments
  • Basic receipts and documents are available or can be obtained

Tools you need:

  • Salary certificates, pension or income statements
  • Bank and custody account statements
  • Insurance and pension records
  • Collection of receipts (digital or on paper)
  • Optional: tax software or a digital fiduciary app

Updated on 22 August 2026. We checked the submission deadlines in the canton of Zurich, the completeness of the document checklist and the references to official guides. What has changed since first publication: the linked Zurich guide has been updated from the 2025 to the 2026 edition. Newly added are the maximum deadline extension to 30 November, the deadline for legal entities of 30 September, and a note on the change of system in the taxation of residential property from the 2029 tax year. Still valid without change: the submission deadline of 31 March for individuals in the canton of Zurich, the entire structure of the document checklist, the option of electronic submission and the principle that deductions and detailed rules differ from canton to canton.

Tax return checklist: how to prepare your tax return properly

For your tax return in Switzerland, you need your salary certificate, bank and custody account statements as of 31 December, pension certificates (pillar 3a), a schedule of debts, receipts for professional, medical and continuing education costs, and property documents.
With a structured tax return checklist, you keep track of all the documents you need, avoid queries from the tax authorities and make sure that no deductions are forgotten.

The following checklist helps you prepare your tax return systematically, whether you submit it yourself or have it completed by a professional.

 

Tax return checklist: the documents you should have ready

This checklist is deliberately neutral for all of Switzerland. Deductions and detailed rules differ from canton to canton. The aim is for you to have all relevant documents complete and properly prepared before you fill in your tax return or have it submitted. Among other things, this checklist is based on the guide of the canton of Zurich (2026 edition).

Note on the change of system: For the years from 2029, the change of system in the taxation of residential property abolishes the imputed rental value and, for the most part, the deduction for debt interest. Up to and including the 2028 tax year, mortgage and maintenance documents remain relevant as before.

 

1) Personal details and household

  • Identity documents / AHV number (if required)
  • Marital status and changes during the tax year (marriage, separation, divorce)
  • Children / support payments: relevant proof (e.g. custody arrangement, alimony, childcare costs, depending on the situation)
  • Any moves away or moves in, or residence status (if relevant)

2) Income (all sources of income)

  • Salary certificate(s) and/or payslips (if you changed jobs: all employers)
  • Pensions / daily allowances / insurance benefits (if any)
  • Maintenance payments (alimony) and other recurring benefits (if relevant)
  • Interest income and dividends (bank and custody account statements, tax statements, annual statements)
  • Additional earnings / fees / commissions (if any)
  • Other tax-relevant income (depending on the situation)

3) Assets (as of the reference date)

  • Bank and postal accounts: balances as of the reference date (e.g. 31 December)
  • Securities/custody accounts: custody account statements, tax statement, year-end holdings
  • Receivables (e.g. loans to third parties, deposits, if relevant)
  • Cash (if relevant)
  • Surrender values of life and annuity insurance policies (if relevant)
  • Other assets (depending on the situation)

4) Debts and debt interest

  • Schedule of debts (mortgages, credits, loans, leasing, if relevant)
  • Interest statements / annual certificates on debt interest

5) Professional expenses (employment)

  • Details/receipts for work-related expenses (regulated by the canton)
  • If available: proof of (job-related) continuing education and its costs

6) Pensions and insurance

  • Certificate(s) of payments into pillar 3a
  • Proof of pension contributions, where relevant and not already covered otherwise
  • Insurance records (e.g. premium confirmations), where relevant in your canton or deduction category

7) Health, donations and other deductions

  • Receipts for medical and accident costs (where applicable; regulated by the canton)
  • Donation receipts (charitable contributions)
  • Proof of administration costs for movable private assets (if claimed)
  • Disability-related costs (if relevant)
  • Contributions to political parties (where applicable; regulated by the canton)

8) Real estate (if any)

For real estate, the detailed rules differ particularly widely from canton to canton. You should have these documents ready in any case:

  • Mortgage documents and interest certificates
  • Documents on ownership / basic data (if required)
  • If you rent out all or part of a property: documents on rental income and relevant statements (if applicable)
  • Other property-related proof according to cantonal practice (without prescribing cantonal details here)

 

For specific deduction rules, limits and forms, the cantonal guide and the responsible tax office always apply. Typical starting points are:

  • Website of the cantonal tax office (guide / information sheets / eTax portal)
  • Federal administration: overview and legal basis for taxes (ESTV)

 

Links to all cantonal tax offices

 

Pro tip: how to use the checklist without stress

  • Sort all documents according to the blocks above (PDF/folder structure).
  • Request missing proof early (bank, insurance, pension provider).
  • If anything is unclear, ask the responsible tax office or a fiduciary rather than making assumptions.

The more complete your documents are, the more efficiently your tax return can be prepared or checked.

Do you need help with your tax return?

Fast, accurate, digital and on time

 

Why does professional help with your tax return make sense?

Completing your tax return is time-consuming and prone to errors, especially if you have several sources of income, assets, securities or special cases. Tax regulations change regularly and are often hard for non-specialists to keep track of.

Professional support helps you save time, avoid mistakes and present your tax situation correctly and completely. At the same time, you make sure that all permitted deductions are taken into account.

 

Preparing your tax return: the typical process

A well-prepared tax return follows clear steps:

  • Collecting and organizing all relevant documents
  • Clarifying open questions about income, assets and deductions
  • Preparing or checking the tax return in line with current tax law
  • Submitting it to the responsible tax authority

Structured preparation reduces queries and speeds up the assessment.

 

Benefits of professional support with your tax return

Specialists know the current legal requirements and what matters when declaring income, assets and deductions. This helps avoid mistakes that can lead to corrections or delays.

You also benefit from an objective assessment of your tax situation and receive pointers to optimization options within the applicable law.

 

Tips for a smooth tax return

  • Collect documents throughout the year instead of searching for them just before the deadline
  • Keep receipts complete and traceable
  • Use digital filing to keep an overview
  • Check deadlines early and meet them
  • If in doubt, get professional support in good time

 

Tax return: employed or self-employed

The scope and complexity of the tax return differ depending on the form of employment. Employees usually declare their salary income and deductions, while the self-employed must also take into account a profit and loss statement and business assets.

With mixed forms of income in particular, a clean separation and correct declaration are essential.

 

Costs and benefits of professional tax help

The costs of professional support depend on the scope and complexity of the tax return.

In many cases, however, the effort is offset by a clear benefit: time saved, fewer queries and greater certainty in your declaration.

A correctly prepared tax return reduces the risk of additional claims or fines and gives you clarity about your own financial situation.

 

Why submitting on time is essential

If the tax return is not submitted on time, reminders, discretionary assessments or fines may follow. In more complex cases, this can lead to financial disadvantages.

If submitting on time is not possible, you should request a deadline extension in good time.

 

Digitalization and the tax return

Digital submission and electronic receipts make the tax return considerably easier. Documents can be filed in a structured way, data from the previous year can be carried over and processes can be made more efficient.

This leads to a better overview, fewer queries and smoother handling overall.

 

Special tax features and special cases

Certain life situations such as marriage, divorce, inheritance, property ownership, assets abroad or capital investments bring additional tax requirements.

In such cases, it is particularly important to look at the tax implications early and to record all relevant information correctly.

 

Tax planning beyond the current year

A good tax return does not only look at the past year; it also forms the basis for future tax decisions. If you plan early, you can make targeted use of deductions and avoid financial surprises.

 

Tax advice as part of your overall financial planning

Beyond the tax return, professional advice can help you classify financial decisions sensibly from a tax perspective. This includes pensions, asset structure, investments and long-term planning.

A holistic view ensures that tax aspects are not considered in isolation, but are sensibly integrated into your personal financial planning.

Frequently asked questions

What are the deadlines for submitting the tax return in Zurich?

The deadline for submitting the tax return in Zurich is 31 March of the year following the tax period. A deadline extension must be requested from the municipal tax office before the submission deadline expires and is granted until 30 November of the following year at the latest. Requests that go beyond this are rejected unless there are exceptional reasons. A deadline that has already expired can no longer be extended. Legal entities submit their tax return by 30 September.

Can I hire a tax advisor as a private individual?

Yes, as a private individual you can also hire a tax advisor to get professional support with your tax return.

How much does professional support with the tax return cost?

The cost of this service varies depending on the scope and complexity of your tax situation. Feel free to contact us by phone or email for a cost estimate.

Which documents are needed for the tax return?

Various documents are needed for the tax return, for example salary certificates, receipts for donations or special expenses, proof of capital gains or property ownership, and information on assets abroad.

How long does it take to receive a refund?

The time until the refund depends on various factors, such as when the tax office receives your tax return and how long it takes to process it.

Can I have a tax return completed retroactively?

Yes, it is possible to have a tax return completed retroactively. However, it is important to do this as soon as possible to avoid possible default interest or penalties.

What do I do if I have to make an additional tax payment?

If you have to make an additional tax payment, you will receive a notice from the tax office with information on the amount and the payment deadline.

Are donations or other special expenses tax-deductible?

Yes, donations and other special expenses can be deducted for tax purposes. It is important to find out about the specific rules and regulations for these expenses.

Can I submit my tax return electronically?

Yes, you can submit your tax return electronically and therefore without paper.

What happens if I make mistakes in my tax return?

If you make mistakes in your tax return, your tax liability may be calculated incorrectly. In this case, you should contact the tax office and clarify the situation as quickly as possible.

Key takeaways

  • Tax advisors save time and reduce mistakes
  • Professional help means more of the available deductions are used
  • Submitting on time avoids fines and estimated assessments
  • Digital processes make the tax return considerably easier
  • Tax advice also offers long-term planning benefits

The support of a professional tax advisor when completing your tax return in Zurich offers numerous benefits, including saving time, accuracy and taking all permissible deductions into account. Digitalization has simplified the process further and allows for efficient handling.

Planning, advice and long-term financial strategies also play an important role. A fully prepared collection of receipts shortens processing and reduces queries from the tax office. For cantonal details, the guide of your canton of residence always applies.

Sources

  1. Kanton Zürich, Finanzdirektion. (2026). Weisung über das Steuererklärungsverfahren (ZStB Nr. 132.1). Retrieved 22 August 2026 from zh.ch
  2. Kanton Zürich, Kantonales Steueramt. (2026). Wegleitung zur Steuererklärung 2026. Retrieved 22 August 2026 from zh.ch
  3. Eidgenössisches Finanzdepartement. (2026). Systemwechsel bei der Wohneigentumsbesteuerung. Retrieved 22 August 2026 from efd.admin.ch
A competent tax advisor stands in a modern fiduciary office, ready to provide client-focused advice.

Author

Rodolfo Intaglietta

Rodolfo Intaglietta is the founder and managing director of ONE! Treuhand GmbH. As a Treuhänder mit eidg. Fachausweis (Swiss fiduciary with Federal Diploma of Higher Education) and Diplomierter Experte in Rechnungslegung und Controlling (Expert in Accounting and Controlling with Advanced Federal Diploma of Higher Education), he supports entrepreneurs throughout Switzerland with clear figures, digital processes and personal advice on an equal footing.

The qualification “eidg. diplomierter Experte in Rechnungslegung und Controlling” corresponds to qualification level NQF 8 and is therefore at the highest level of education, comparable to a doctorate in terms of professional depth and responsibility.