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Guide

Deductions

Deductions reduce your taxable income and thus your tax burden. Which deductions are permitted and how you document them is regulated partly differently by the Confederation and the cantons.

In brief

Deductions include in particular professional expenses, expenses for education and further training, childcare costs, debt interest, donations and medical and insurance costs you bear yourself. The current guidelines of your canton and federal law are always decisive. Collect all receipts during the year so that you can fully substantiate the information in your tax return.

What matters

  • Actual versus lump-sum deductions

    For many items you can choose between a lump-sum deduction and the actual, documented costs. Which option is more favourable depends on your personal situation and is worth calculating.

  • Note cantonal differences

    Uniform rules apply to the direct federal tax, whereas for cantonal and communal taxes the rates and maximum amounts can vary from canton to canton. Therefore always check the current guidelines of your canton.

  • Receipts are mandatory

    Without proof, deductions are generally not accepted. Keep receipts, invoices and confirmations for as long as the retention periods require.

  • Timing of the costs

    As a rule, what matters is the tax year in which the costs were incurred. Where possible, plan larger expenses such as further training or renovations with the tax period in mind.

  • Individual review in case of uncertainty

    In more complex situations, for example self-employment or cross-border circumstances, a review by a specialist is recommended.

Articles on Deductions

5 articles with explanations, checklists and sources.

What you should have ready

  • Salary certificate with details of expenses and fringe benefits
  • Receipts for travel costs between home and place of work
  • Invoices for education and further training
  • Proof of childcare costs paid to third parties
  • Donation confirmations from charitable organisations
  • Summary of debt interest
  • Receipts for medical and dental costs you paid yourself
  • Premium invoices from your health insurer

Frequently asked questions – Deductions

Sources and related topics

Sources

Updated: August 2026 · General information, not individual tax advice.

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