Filing Your Tax Return in Geneva: Step-by-Step Guide 2026

2026 tax calendar in Geneva

Your 2025 tax return (covering income earned in 2025) must be filed with the Geneva Cantonal Tax Administration (AFC) according to the following schedule:

• Forms sent out by the AFC: January 2026
• Standard filing deadline: 31 March 2026
• Extension available: request it online at ge.ch before 31 March. Fee of CHF 20 to CHF 40. Extensions are usually granted until 30 June or 30 September.
• Default assessment: if you don't file, the AFC issues a default assessment (an estimate), generally unfavourable to the taxpayer, along with a fine of up to CHF 1,000 (up to CHF 10,000 for repeat offences or serious fault).

You file through the GeTax software, available online at ge.ch/getax. You can enter your data online or download the application, then submit either electronically (e-démarches) or by mailing the signed summary sheet.

Klear tip: always request an extension if you're not sure you can file by 31 March. The fee is minimal and it spares you the stress of a default assessment.

Documents to gather before you start

Before opening GeTax, pull together everything you'll need:

Income:
• Salary certificate (provided by your employer in January)
• Statements for additional income (freelance work, rental income, etc.)
• Bank and securities statements (interest, dividends)
• Pension statements (AVS, AI, occupational pension/LPP, pillar 3a)

Deductions:
• Pillar 3a contribution certificate
• LPP buy-in certificate
• Receipts for continuing education costs
• Invoices for unreimbursed medical expenses
• Donation receipts
• Childcare invoices
• Proof of alimony paid
• Invoices for property maintenance work

Assets (wealth):
• Bank statements as of 31 December (all accounts, including those held abroad)
• Securities: value as of 31 December (the official price list, the Kursliste, is published by the Swiss Federal Tax Administration (FTA), the federal body, which is distinct from the cantonal AFC)
• Tax valuation of any real estate
• Surrender value of life insurance policies as of 31 December
• Vehicles: residual value (purchase price less 40% annual depreciation)

Filling in your return: the key sections

GeTax walks you through the return section by section. The most important ones:

Personal situation: marital status as of 31 December, number of dependent children, religious affiliation (for the church tax).

Employment income: carry over the figures from your salary certificate. Watch out for benefits in kind (company car, housing), which must be declared.

Income from movable assets: bank interest (even small amounts), share dividends, gains from investment funds. Interest from accounts held abroad must be declared (under international tax-transparency rules — the Automatic Exchange of Information, or AEOI).

Real estate income: the imputed rental value of your main residence, plus rental income from any properties you let out. You can deduct mortgage interest and maintenance costs.

Deductions: this is the most strategic part. Check every deduction you might be entitled to. The most commonly missed: training costs, professional association fees, medical expenses, and donations.

Assets: declare all of your wealth as of 31 December (bank accounts, securities, property, vehicles, valuables). Wealth tax is levied by the cantons only (there is no federal wealth tax).

The most common mistakes

The mistakes that cost Geneva taxpayers the most:

1. Missing deductions: pillar 3a is the most frequently overlooked deduction. Every year, thousands of taxpayers pay too much tax simply because they forget to declare their 3a contribution.

2. Not declaring foreign accounts: through the Automatic Exchange of Information (AEOI), the AFC receives data from more than 100 countries. Undeclared accounts lead to back taxes, fines, and potentially prosecution for tax evasion.

3. Confusing maintenance costs with value-adding work: only maintenance costs (those that preserve the property's value) are deductible. Improvements that increase the property's value are not. For example: repairing a roof is maintenance (deductible); adding a sunroom adds value (not deductible now, but deductible when you sell, in calculating the capital gains tax on the property).

4. Not reviewing the flat-rate vs. actual-cost choice: many taxpayers stick with the default flat rate without checking whether claiming actual costs would work out better.

5. Forgetting inherited assets: if you received an inheritance during the year, the inherited assets must be included in your wealth from the date you received them.

Filing online vs. using a fiduciary

Should you file your return yourself or hand it to a professional?

Filing online (GeTax on your own):
• Suitable for simple situations: salaried employee, no real estate, no self-employment
• Cost: free (apart from the extension fee)
• Risk: missed deductions, data-entry errors

A fiduciary (like Klear Conseils):
• Essential for complex situations: self-employed individuals, property ownership, multiple income sources, assets held abroad
• Proactive optimisation: the fiduciary identifies every deduction you're entitled to
• Representation in the event of an objection or a request for information from the AFC
• Cost: from CHF 250 for a straightforward personal tax return at Klear Conseils

The return on hiring a fiduciary is often positive: the deductions a professional finds usually more than cover the fee. At Klear Conseils, we estimate that our clients save an average of CHF 1,500 to CHF 3,000 in tax compared with filing on their own.

Get in touch for a free estimate.

Further reading: flat-rate vs. actual expenses · the imputed rental value · challenging your tax assessment · inheritance and gifts · the 2026 tax deadlines