Bought a Home in Switzerland? What You Need for Your First Tax Return

What changes after you buy your home?

Your first Swiss tax return as a homeowner needs a small property file alongside your usual salary, bank and pension documents. This guide covers a home you own privately and live in yourself. Tell your preparer if any part was rented out, used for a business or owned with someone who files separately.

Under the rules currently in force, an owner-occupied home has two distinct entries: its tax value as an asset and its imputed rental value as income. The mortgage also has two separate figures: the outstanding debt and the interest for the year. The official Swiss overview of property taxation explains these categories. Keeping them separate avoids treating your monthly mortgage payment as one tax deduction.

Your first homeowner tax return checklist

Create one folder for the property and gather the following. Send complete documents with their dates and reference pages; a screenshot showing one total often leaves out the detail needed to check it.

• Purchase and ownership: the signed purchase deed or contract, completion statement, property address and ownership shares. Include any agreement explaining a different split of financing between co-owners.
• Dates and use: the ownership transfer date, move-in date and a short note about any vacant, uninhabitable or rented period.
• Official property values: the latest cantonal or municipal valuation notice showing the property tax value and imputed rental value, plus any revised assessment.
• Mortgage certificates: each lender's annual statement showing the debt outstanding at year-end and the interest charged during the tax year. Include private loan agreements where relevant.
• Work on the property: itemised invoices, payment evidence and a short description of what was repaired, replaced or added. Include grants and reimbursements.
• Apartment ownership: the owners' association's annual statement, your allocated costs and renewal-fund information, as well as invoices you paid directly.
• Purchase funding: pension or pillar 3a withdrawal certificates, relevant tax notices, and documents for gifts or family loans used towards the purchase.

Keep the purchase papers in a permanent folder too. Your annual tax file should make them easy to find without requiring you to assemble the entire purchase history again.

Use the tax valuation for the correct year

The purchase price, the bank's mortgage valuation and the official tax value serve different purposes. Give your preparer the valuation notice instead of assuming that the price you paid belongs in the wealth section.

Check the year on the notice. For example, Zurich's 2026 property revaluation guidance says the new valuations will generally be sent in January 2027 for the 2026 tax period. It also explains transitional treatment of imputed rental values. A neighbour's figure or the seller's old return may therefore be a poor substitute for the notice relevant to your property and tax year.

If you bought with a partner, include both the ownership and financing documents. The amount each person paid from their bank account does not by itself settle how the property, debt and income should be allocated. Bern's guidance on shared ownership illustrates why the legal ownership arrangement and debt responsibility matter.

Separate mortgage interest from repayments

Mortgage interest can qualify for a deduction under the current debt-interest rules, subject to the applicable limits. Direct repayment of the mortgage principal, also called amortisation, is not an income-tax deduction. It reduces the outstanding debt instead. This distinction is explicit in the Zurich tax return instructions, under debt interest.

If your regular bank payment includes both, send the annual mortgage certificate. If you use a pillar 3a arrangement for indirect amortisation, include the separate 3a contribution certificate and explain the arrangement. Your preparer needs to identify each amount and avoid counting the same payment twice.

Keep repair bills separate from improvements

Preserving an existing property's condition can qualify as maintenance; adding lasting value generally does not qualify as an ordinary maintenance deduction. A project can contain both. Zurich's property-cost guidance explains this distinction and the need for details of the condition before and after the work.

For example, “kitchen renovation” on a single invoice gives your preparer little to work with. An itemised bill, the contractor's scope and a few before-and-after photographs make it easier to assess replacement work and any upgrade. Send energy-saving work and associated subsidies separately for review under the relevant rules.

For an apartment, provide the association's breakdown rather than treating every payment to the building manager as deductible. Keep improvement invoices even where no current income-tax deduction is available: they may be relevant to the property-gains calculation when you sell.

Imputed rental value has not disappeared yet

On 1 April 2026, the Federal Council set 1 January 2029 as the start date for the home-ownership tax reform. Imputed rental value therefore still matters for tax periods through 2028. Do not remove it from an earlier return because you have read that its abolition was approved.

The reform also changes deductions: the maintenance deduction for owner-occupied homes ends, and debt-interest deductions become more restricted, with a limited first-buyer provision. The official announcement of the 2029 start date sets out these linked changes. Prepare the documents for the tax year being filed rather than applying the future system early.

Two common first-year questions

I bought late in the year. Do I still send the property documents?

Yes. Send the purchase and move-in dates, annual mortgage statement and official valuation. Note any renovation period before moving in so your preparer can check the correct treatment for that period.

What if my valuation notice has not arrived?

Tell your preparer it is missing and send the purchase documents and any correspondence with the tax office. Do not silently substitute the purchase price or delay sharing the rest of your tax file.

Official sources

Checked on 29 September 2026. Canton-specific examples illustrate points to check; your preparer should apply your own canton's rules.

• ch.ch: taxation of real estate
• Federal Tax Administration: reform starts on 1 January 2029
• Canton Zurich: property valuations for 2026
• Canton Zurich: maintenance and improvement costs
• Canton Zurich: 2025 tax return instructions
• Canton Bern: shared property ownership