Swiss withholding tax: employer duties and 2026 changes

As soon as you employ people who hold no Swiss permanent residence permit, you take on a second role alongside being their employer: you collect tax for the canton. Quellensteuer, the Swiss tax deducted at source, comes off the salary before it is paid out, you remit it to the cantonal tax authority, and you are liable if the deduction is wrong. It sounds technical. The rules behind it are clear. This guide explains them in plain English and shows why 2026 deserves a close look from every company with cross-border commuters on the payroll.

Who is liable for withholding tax

Withholding tax applies to two groups. The first group is employees who live in Switzerland without a C permit, the Swiss settlement permit. In practice these are holders of a B permit (residence) or an L permit (short-term residence). The second group is people who are not resident in Switzerland at all: cross-border commuters, weekly residents who keep their family home abroad, and board members living outside Switzerland.

One exception matters. Anyone who is married to a Swiss citizen or to a C permit holder and is not legally separated goes through the ordinary tax assessment and pays no withholding tax. Liability also ends once the reason for it no longer applies. Marriage to a Swiss citizen, naturalisation and being granted a C permit all stop the deduction from the following month. This is where mistakes happen most often, because payroll often hears about the change weeks later.

Your duties as an employer

You have three tasks, and each one comes with a deadline.

Register within 8 days. You register every new employee subject to withholding tax with the cantonal tax authority within 8 days of their first working day and give their AHV number (the Swiss social security number), nationality, permit type and marital status. In the canton of Zurich you can do this on a paper form, through the web portal or directly from swissdec-certified payroll software. swissdec is the Swiss standard for electronic payroll reporting. If you are still building your Swiss entity, this registration sits alongside the other employer registrations covered in our guide to hiring in Switzerland.

File monthly in most cantons. You account for the deducted tax to the canton and pay it over. Zurich requires monthly filing within 30 days of the end of the period. Quarterly filing is open there to employers with fewer than 10 people subject to withholding tax. Late payment attracts default interest. Each canton sets its own rules here, so what counts is the practice in the canton where the salary is taxed.

Apply changes from the following month. Marriage, divorce, the birth of a child, a spouse taking up work: each of these events moves the employee into a different tariff code, effective from the month after it happens.

In return for this work you keep a commission of 1 to 2 per cent of the amount you remit. The canton of Zurich pays a flat 2 per cent. Some cantons, Basel-Stadt among them, pay the full 2 per cent for electronic filing and 1 per cent for paper. Filing electronically therefore pays twice over: less admin work and a higher commission.

The tariff codes, made simple

The tariff code decides how much tax you deduct. Four codes cover most situations:

• Tariff A: single people (unmarried, separated, divorced, widowed)
• Tariff B: married couples with one income
• Tariff C: married couples where both partners earn
• Tariff H: single parents with children in the same household

The full code adds the number of children and a Y or N for church tax. B2Y, for example, stands for married, sole earner, two children, church tax included. Special codes exist alongside these: code G covers daily benefits that an insurer pays out directly, for example sickness or accident benefits, and separate code families apply to German cross-border commuters and to the newer group of Italian cross-border commuters.

The CHF 120'000 threshold and the 31 March deadline

Two points are worth explaining to your employees as well, because their own money is at stake.

Above CHF 120'000 gross per year, an employee who lives in Switzerland and is taxed at source also goes through a subsequent ordinary assessment. They file a full tax return, and the withholding tax already paid is credited against the result. One detail catches people out: once the threshold has been crossed, the obligation stays in place in the following years even when the salary drops again. You carry on deducting withholding tax all the same.

Below CHF 120'000, an employee can apply for the ordinary assessment voluntarily, for example to claim deductions for contributions to pillar 3a (the tax-privileged private pension), further training or commuting costs. The deadline is 31 March of the following year, and it cannot be extended. The decision deserves thought: once the application is made, the ordinary assessment applies in every subsequent year as well, and depending on the municipality it can work out more expensive than the withholding tariff.

New in 2026: all three cross-border regimes were adjusted

Companies with cross-border commuters need to look closely this year. Within a few months, Switzerland reset its agreements with Germany, France and Italy.

France: the supplementary agreement has applied on a permanent basis since 1 January 2026. Working from home up to 40 per cent of annual working time stays taxable in the employer's state. The condition attached to it: Swiss employers must keep accurate records of the days worked from home and the travel days of their employees resident in France, because the first automatic exchange of data with France takes place at the beginning of 2027. If you do not document the days, you cannot support your filing.

Italy: the permanent telework rule has been in force since 9 February 2026, with retroactive effect from 2024. Working from home for up to 25 per cent of the time does not affect cross-border status or taxation. Cross-border commuters who took up work after mid-2023 have their own tariff codes, and Switzerland levies 80 per cent of the normal withholding tax on them.

Germany: the amended double taxation agreement has applied since 1 January 2026. It clarifies, among other points, how non-return days are treated, meaning working days when a cross-border commuter cannot return home after work, and how salary that continues to be paid during garden leave is taxed. One rule stays central: the reduced deduction of 4.5 per cent for genuine cross-border commuters applies only when the certificate of tax residence stamped by the German tax office is on file. If it is missing, you deduct tax at the full rate.

Good news for everyone else: employers without cross-border commuters file domestically in 2026 the way they always have. The 2026 tariff tables are published, and the domestic procedure has changed little in substance.

Why getting this right saves real money

The employer owes the withholding tax to the canton and is liable for deducting it correctly, whether or not the deduction was actually taken from the salary. The tax authority can reclaim under-deducted amounts from you, and recovering that money from a former employee becomes your problem. Using deducted withholding tax for your own purposes is a criminal offence. Late payment adds default interest on top.

The pitfalls we see most often in practice: the missed 8-day registration for a company's first foreign employee, tariff codes left unchanged after a marriage or a birth, missing certificates of tax residence for German cross-border commuters, and, from this year, undocumented days worked from home.

Withholding tax, handled for you

At clever hr, withholding tax is a fixed part of payroll. We register your employees on time, file every month with the correct tariff code and keep tariff codes up to date after a marriage or a birth. Filing runs electronically through the swissdec standard and its ELM channel for uniform electronic salary reporting, which also secures the full commission in several cantons. All of it at a published fixed price: CHF 250 per month plus CHF 25 to 40 per employee, as set out on our pricing page. Our guide to outsourcing payroll describes how the full payroll cycle runs once an external team takes it over.

If you employ people on a B permit or cross-border commuters and want certainty that 2026 runs correctly, let us talk it through in 30 minutes with no obligation. Book an intro call.