Withholding tax at source: a guide for employers and employees

Not all employees in Switzerland pay their taxes the same way. For some workers, income tax on employment is not settled through the annual return but is withheld directly by the employer from each salary payment. This is withholding tax at source, a mechanism that creates precise obligations for the company and raises frequent questions for those subject to it. Here is how it works for both sides.

Who is liable

Withholding tax at source applies in particular to foreign workers without a C settlement permit who reside or stay in Switzerland for work, and to cross-border commuters and other persons resident abroad who earn Swiss-source income. In short, the typical profiles are:

foreign-national employees holding a B permit (or other residence permits), without a C permit;
cross-border commuters who work in Switzerland and reside abroad;
certain recipients of benefits and income of Swiss source.

Swiss citizens and foreigners holding a C permit, by contrast, are taxed under the ordinary procedure by means of a return. Even someone liable to withholding tax, if married to a person who is not liable, may fall under the ordinary procedure: family circumstances matter.

How the deduction works

The employer withholds the tax at each salary payment, applying the rates set by the competent canton. The rates take account of factors such as marital status, the number of children and the spouse’s activity, summarised in tariff codes that must be correctly assigned to each employee.

The amount withheld replaces, within certain limits, the ordinary tax: the employee receives the net pay and, in principle, does not have to file a return for that income. Territorial competence (the canton whose rates apply) depends on the worker’s situation, an aspect often underestimated in the case of cross-border commuters or relocations.

The employer’s obligations

For the company, withholding tax at source is a direct responsibility. In short, the employer must:

correctly identify the employees who are liable and assign the right tariff code;
calculate and withhold the tax at each salary payment according to the cantonal rates;
pay over the withheld amounts to the competent authority within the prescribed deadlines;
account for and report periodically to the administration;
update the data when the employee’s situation changes (marriage, children, obtaining a C permit, end of the employment relationship).

An employer that withholds incorrectly or fails to pay over the tax is liable for it. The most common errors are assigning the wrong tariff code, failing to update after a change in family circumstances and mishandling cross-border commuters.

Reassessment: the withholding is not always final

An essential point for the employee: the deduction at source does not necessarily settle the account. In various situations the worker may or must move to an assessment with the administration:

when a given income threshold is exceeded, subsequent ordinary assessment is triggered, in which a return is filed anyway and the withholding tax already paid is credited;
the employee may request an adjustment to claim deductions not taken into account in the rates (for example pension contributions, specific expenses or deductible charges);
in the event of an incorrect deduction, a recalculation may be requested.

These steps have deadlines to be met: anyone wishing to recover deductions or correct errors must act within the time limits, otherwise the withholding stands as applied.

Mistakes to avoid

Employer side: underestimating the obligation, getting the tariff code wrong, failing to update the data, missing the payment deadlines.
Employee side: believing that withholding is always final and thereby losing deductions to which one would be entitled, or ignoring the threshold that requires ordinary assessment.

Both sides share the same risk: treating withholding tax at source as an automatism, when in fact it requires attention to codes, thresholds and deadlines.

How we handle it

At SIH ONE we manage withholding tax at source within the payroll: we identify those who are liable, assign the correct tariff codes, handle deductions, payments and accounting within the deadlines and keep personal situations up to date. For employees we check whether an adjustment is worthwhile or whether ordinary assessment is triggered, so that no deduction is lost.

Want error-proof salary management? Let’s talk about your payroll.