Filing Your Swiss Tax Return: A Step-by-Step Guide 2026

The envelope that's been sitting on your desk since March

It's early June. Somewhere between an electricity bill and a postcard sits that one envelope from the tax office. Back in March you dutifully extended the deadline – in the canton of Zurich that's easy until the end of September, in Bern free of charge until mid-July. So there it sits. Looking at you a little reproachfully every evening.

I know the feeling. The tax return has a reputation like the dentist: you know you have to, and you put it off anyway. Yet it's no rocket science. If you work through it systematically and have your documents together, you'll be done in two to three hours – and the best part: every time you forget a deduction, you're giving away real money. For most working people, it's a few hundred to a few thousand francs you overpay simply because a field stays blank.

In this article I'll show you step by step how to file your tax return yourself – which documents you need, which tool to use, and above all: which deductions actually pay off in 2025. You don't need a fiduciary for CHF 250 if your situation is normal (salary, maybe a little wealth, pillar 3a). Save that for the day things get complicated.

Step 1: Gather your documents – half the battle

90% of people who despair over their tax return don't fail at the filling-in. They fail because halfway through they realise: "Wait, where's the interest statement from my savings account?" Then they give up and the envelope sits for another three weeks.

Do it differently. Collect everything in one pile (or one folder on your laptop) before you even open the tool. Here's what you need:

Income

Salary statement (Lohnausweis) from every employer you had in 2025
Statements for secondary income (board memberships, freelance work, taxable tips)
For unemployment / illness: statements from ALV, IV, daily-allowance insurance

Assets & earnings

Account and interest statement as of 31 December 2025 from every bank (including the old account you never use)
Tax or portfolio statement for your securities (shares, ETFs, funds)
For crypto: year-end balance in CHF (price as of 31 December)
Pillar 3a certificate from VIAC, finpension, frankly or your bank
For homeowners: latest tax value, mortgage interest statement

Deductions

Certificate of your pillar 3a contributions
Receipt for a pension fund buy-in (if you made one)
Health insurance premium statement + receipts for medical costs you paid yourself
Continuing-education and course invoices
Donation receipts from charitable organisations
Debt interest statements (consumer loan, credit card, mortgage)
Receipts for third-party childcare (daycare, childminder)

Once that pile is ready, the unpleasant part is over. The rest is typing.

Step 2: The right tool – and it costs nothing

You don't need to buy software. Practically every canton offers a free, official online tax return. In the canton of Bern it's called TaxMe-Online, in Zurich you fill it in directly in the tax portal, other cantons have their own portals or a free program to download. You log in with the code from your envelope – done.

The big advantage of the official tools: they calculate automatically. You type in the numbers, the program adds them up, applies the deductions and shows you at the end what you'll likely pay or get back. And on request they carry over last year's data – name, address, bank details, often even the securities. That makes you noticeably faster in year two.

My tip: use the official cantonal tool, not a commercial program. For a normal situation there's no reason to pay for one. The paid tools only become worthwhile once you own several properties, are self-employed or have international income.

Step 3: Enter your income

Now it begins. Income first, because everything else builds on it.

The salary statement is your most important document. Most tools number the fields exactly like the statement – so you simply transfer them line by line. If you changed jobs in 2025, you have two salary statements and enter both.

Then come the other earnings: interest on your accounts (shown in the interest statement), dividends and distributions from your securities, any rental income, side jobs. Even if the amount is small – CHF 12 of savings-account interest belongs in there. The tax office receives these figures too, and gaps stand out.

If you're married or in a registered partnership, you file one joint return together. Both incomes, both assets, one form. In an unmarried partnership (Konkubinat), by contrast, each person files their own return.

Step 4: Assets and securities

In Switzerland you pay tax not only on your income but also a (usually modest) wealth tax on what you own. The reference date is always 31 December.

The securities schedule includes:

All bank accounts with balance as of 31.12.2025
Shares, ETFs, funds (number and market value at year-end)
Crypto holdings, converted to CHF
Pillar 3a and vested-benefits assets (often listed separately, depending on the canton)
Life insurance policies with a surrender value
Car (Eurotax value), larger valuables

It sounds like a lot, but it's only half as bad: the bank gives you a tax statement that already compiles exactly these values. In the tool you type them in or import the file.

One detail many people give away: if you paid foreign withholding tax on dividends (for example on US shares), you can reclaim part of it via form DA-1. With a broadly diversified ETF portfolio that's quickly a few dozen to a hundred francs a year. How you build such a portfolio in the first place is something I covered in ETF Investing for Beginners.

Step 5: Deductions – this is where you get your money back

This is the part that decides your bill. Every deduction lowers your taxable income, and depending on your tax rate you keep 20 to 40 centimes per deducted franc. Go through this list as if money were on the line – because it is.

Pillar 3a – the biggest lever for employees

Anyone affiliated with a pension fund was allowed to pay up to CHF 7,258 into pillar 3a in 2025 and deduct the full amount from taxable income. The same maximum applies for 2026. If you're self-employed without a pension fund, it's 20% of net earned income, up to a maximum of CHF 36,288.

This is by far the most effective legal tax deduction most employees have. On a middle income, the full 3a contribution quickly saves you CHF 1,500 to CHF 2,000 in tax – year after year. Which provider pays off is covered in the Pillar 3a comparison: VIAC vs. finpension vs. frankly.

There are several deductions for the costs around your job (amounts for direct federal tax 2025, sometimes differing by canton):

Deduction	Amount 2025 (federal)
Other work expenses (flat rate)	3% of net salary, min. CHF 2,000, max. CHF 4,000
Commute / travel costs	up to CHF 3,300
Meals away from home	CHF 15/day, max. CHF 3,200 (with canteen CHF 7.50/day, max. CHF 1,600)
Continuing education (job-related)	actual costs

You get the flat rate for other work expenses automatically, without a receipt. If your actual costs are higher (specialist literature, home office, tools), you can claim those instead – but then you need receipts.

Insurance and medical costs

The insurance deduction for your health, accident and life insurance premiums is a flat amount: at federal level CHF 1,800 for singles, CHF 3,700 for married couples, plus a supplement per child. Most people hit this flat amount with their health insurance premium alone.

Medical costs you pay yourself (dentist, glasses, deductible, franchise) can be deducted on top – but only the part that exceeds 5% of your net income. On CHF 70,000 of net income the threshold is CHF 3,500. If you were hit harder (a big dental treatment, a hospital stay), collecting the receipts really pays off.

Other deductions people often forget

Pension fund buy-in: voluntary payments into the 2nd pillar are fully deductible – one of the strongest levers in the consolidation phase from about age 45.
Donations: gifts to charitable organisations are deductible at federal level up to 20% of net income.
Debt interest: interest on consumer loans, credit cards and mortgages is deductible (not the repayment, only the interest).
Childcare: costs for daycare or a childminder are deductible; the maximum differs strongly at federal level and by canton – check the guide (Wegleitung).
Two-earner deduction: married couples where both work get an extra deduction (federally 50% of the lower income, capped).

A more detailed list of the most worthwhile levers is in the 10 legal tax-saving tips.

Step 6: Check, submit, keep

Before you click "Submit", go through the return once from top to bottom and ask yourself three questions:

Is every account in there? Including the old savings account with CHF 80 on it.
Have I checked every deduction? Better to look at the list one time too many.
Are the bank details for a possible refund correct? A typo here delays your money by weeks.

At the end the tool shows you a provisional calculation. Don't panic if it shows a payment due – or enjoy a credit balance. Then you submit electronically. In most cantons you no longer need to print anything; only a few still require a signed receipt sheet by post.

One last important point: keep your receipts for ten years. You don't send them in (unless the tax office asks), but if there's a query you need to be able to show them. A folder or a scan folder on your laptop is enough.

Practical tip: start planning for next year now

The best tax optimisation doesn't happen while filling in the form, but during the year. Two things you can set in motion this week:

First: set up a standing order into pillar 3a instead of scraping the maximum together in panic in December. CHF 605 a month adds up to exactly CHF 7,258 over the year – and you bank the tax deduction without thinking about it.

Second, new from 2026: you'll be able to pay missed 3a contributions retroactively. Anyone who couldn't pay the full amount in a given year may close the gap later (up to ten years back) and also deduct that retroactive payment from income. Important restriction: only gaps that arose from 2025 onward count – you can't make up earlier years. And you must first pay the regular maximum for the current year before a back-payment is possible. So if you're short this year, note the gap carefully.

Frequently asked questions

By when do I have to file the 2025 tax return?

In most cantons the ordinary deadline is 31 March 2026. Almost everywhere, though, you can extend it online – in Bern free of charge until 15 July, in Zurich until 30 September (with a second request until 30 November). Important: the request must be made before the deadline expires. If you're reading this in June and haven't applied for anything, check your canton immediately.

Is a fiduciary worth it, or should I do it myself?

For a normal situation – salary, some assets, pillar 3a, maybe a few ETFs – you can easily do it yourself. The official tools guide you through. A fiduciary (from roughly CHF 150 to 400) is worth it if you're self-employed, own several properties, have international income or went through a major change (inheritance, divorce, retirement).

What happens if I miss the deadline?

If you don't react at all, the tax office sends a reminder and ultimately assesses you at its discretion – usually to your disadvantage, plus reminder and penalty fees. Correcting a discretionary assessment is a hassle. So: better to request an extension today (if still possible) or submit the return than to keep letting it sit.

I'm taxed at source – do I even have to file a return?

If you're taxed at source (e.g. as a foreign employee without a settlement permit) and earn over CHF 120,000, you're subsequently assessed under ordinary rules and file a return. Even below that threshold, a voluntary assessment (application for "subsequent ordinary assessment") can be worthwhile if you want to claim deductions such as pillar 3a or a pension fund buy-in. The deadline for this is 31 March.

Which deductions do most people forget?

From experience: foreign withholding tax (form DA-1), self-paid dental and medical costs above the 5% threshold, continuing-education costs, credit-card debt interest and donations. Small individually, together quickly a few hundred francs.

The most important thing in one sentence

The tax return isn't an opponent but an opportunity: two to three hours of work at the end of which, thanks to a few well-placed deductions, you pay several hundred to a thousand francs less or get it back.

Grab the envelope off your desk, gather your pile, open the cantonal tool – and get it done this weekend. Your June self, walking past that envelope every evening, will thank you.

And if you want to see exactly how much pillar 3a saves you in tax: run it through the Pillar 3a calculator. Input: your income and your 3a contribution. Result: your tax saving per year, in black and white.