Withholding Tax

Withholding Tax on Income of Foreign Workers in Switzerland

Switzerland applies a withholding tax system on the income of foreign workers, a tax specificity that affects more than 25% of the country's workforce. This mechanism allows the state to levy tax directly on the salary before it is paid to workers who do not hold a C permit or Swiss nationality. This system, distinct from ordinary taxation, has technical particularities, specific rate schedules and administrative procedures that every foreign worker must master. Our law firm assists these taxpayers daily in understanding their tax obligations and legally optimising their situation, taking into account recent legislative developments that have modified certain aspects of this tax regime.

Fundamental Principles of Withholding Tax in Switzerland

The Swiss withholding tax system rests on a simple principle: levying tax directly on the salary of the foreign worker before they receive their remuneration. This method applies to natural persons who, without being domiciled or resident in Switzerland for tax law purposes, exercise a gainful activity there. It mainly concerns holders of B, L and G permits, as well as cross-border workers.

The Swiss withholding tax system pursues several objectives:

• Guaranteeing the payment of tax for persons who might leave Swiss territory
• Simplifying administrative procedures for foreign taxpayers
• Ensuring regular and immediate collection of tax revenues

The legal basis for withholding tax is found in the Federal Direct Tax Act (FDTA) as well as in cantonal legislation. Art. 83 FDTA precisely defines the conditions for withholding tax liability.

Persons Subject to Withholding Tax

The following are subject to withholding tax:

• Foreign workers holding a B permit who do not hold a settlement authorisation (C permit)
• Foreign workers residing abroad but exercising a gainful activity in Switzerland (cross-border workers)
• Persons domiciled abroad who receive income from an activity exercised in Switzerland
• Foreign artists, athletes and lecturers who perform in Switzerland

It is notable that even directors of Swiss companies residing abroad are subject to withholding tax on their fees and attendance allowances. This system therefore extends beyond simple employment relationships.

Change of status, notably obtaining the C permit or acquiring Swiss nationality, leads to the end of withholding tax liability and the transition to the ordinary taxation system, with an annual tax declaration.

Calculation and Rate Schedules for Withholding Tax

The calculation of withholding tax is based on predefined rate schedules that vary according to the personal situation of the taxpayer. These schedules take into account several determining criteria for establishing the applicable tax rate.

Determining Criteria for Calculation

The following factors directly influence the withholding tax rate:

• The taxpayer's marital status (single, married, separated, divorced, widowed)
• The number of dependent children
• Whether the spouse exercises a gainful activity
• The amount of gross income
• The canton of residence or work

Cantonal rate schedules differ considerably from one canton to another, reflecting the fiscal disparities that characterise Swiss federalism. For example, the tax rate can vary by several percentage points between Geneva and Zug for the same income level.

The most common rate schedule codes are:

• Schedule A: single, divorced, separated or widowed persons
• Schedule B: married couples with one income (spouse without gainful activity)
• Schedule C: married couples with two incomes (both spouses work)
• Schedules H and G: specific to persons taxed at source working for several employers

Standard deductions are directly integrated into the rate schedules to take account of usual charges (professional expenses, insurance premiums, etc.). This administrative simplification constitutes both an advantage and a limitation, as it does not always make it possible to reflect the actual situation of the taxpayer.

It is essential to note that withholding tax encompasses federal, cantonal and municipal taxes. The rate applied therefore represents the total tax burden, which explains the sometimes high percentages seen on payslips.

Employer Obligations and Employee Rights

In the withholding tax system, the employer plays a central role as tax collection agent. This position confers specific responsibilities and exposes them to sanctions in the event of non-compliance.

Employer Responsibilities

The Swiss employer who engages workers subject to withholding tax must assume several tax obligations:

• Register with the cantonal tax administration
• Correctly determine the applicable rate schedule for each employee
• Deduct tax from each payment made
• Remit the amounts deducted to the tax administration
• Draw up and provide employees with annual withholding tax certificates
• Inform the administration of any significant change in employees' situations

The employer generally receives a collection commission (between 1% and 4% depending on the canton) on the tax amounts deducted, in compensation for the administrative work performed.

The joint and several liability of the employer constitutes a major legal aspect: in the event of non-deduction or insufficient deduction, the tax administration may turn to the employer to recover the amounts due, even if the employee has already received the full salary.

Employee Rights and Remedies

Workers subject to withholding tax have specific rights to assert their particular situation:

• Right to information on the rate schedule applied
• Possibility of requesting a correction in the event of an error in the tax calculation
• Right to contest the assessment with the tax administration

Objection deadlines are generally short (30 days in most cantons) and must be strictly observed. Our law firm regularly assists taxpayers in these contestation procedures, particularly when errors in applying rate schedules are identified.

It is essential for employees to systematically check their payslips to ensure that the deduction correctly reflects their personal and family situation. Particular vigilance is required during changes in situation (marriage, birth, divorce) that may modify the applicable rate schedule.

Subsequent Ordinary Tax Assessment (SATO) and Corrections

The withholding tax reform that entered into force on 1 January 2021 considerably modified the possibilities for correcting tax levied at source. The Subsequent Ordinary Tax Assessment (SATO) now represents the main mechanism for adjusting the taxation of foreign workers.

Conditions for Access to SATO

The SATO allows taxpayers subject to withholding tax to benefit from the same deductions as taxpayers subject to ordinary procedure. It applies according to two modalities:

• Mandatory SATO: for Swiss tax residents whose annual gross income reaches or exceeds CHF 120,000
• SATO on request: for Swiss tax residents whose income is below CHF 120,000, or for non-residents who meet the conditions of quasi-resident status

The SATO request must be filed before 31 March of the year following the relevant tax year. This deadline is mandatory, meaning that no refund is possible in the event of a late request.

Advantages and Disadvantages of SATO

SATO offers several potential advantages:

• Possibility of claiming deductions not included in the rate schedules (OPA buybacks, continuing education expenses, significant medical expenses)
• Taking account of the taxpayer's actual situation
• Possibility of deducting actual rather than standard expenses

However, it has certain disadvantages:

• Obligation to complete a full tax declaration
• Risk of higher taxation if actual deductions are below the standard amounts
• Irrevocable nature of the option for the duration of withholding tax liability

For non-resident taxpayers, quasi-resident status is particularly significant. It makes it possible to access SATO when at least 90% of the taxpayer's worldwide income is taxable in Switzerland, or when their non-Swiss income is too low to be taken into account by the state of residence.

Our law firm systematically carries out comparative simulations to determine whether SATO is advantageous in each individual situation, thus avoiding procedures that could prove financially unfavourable.

International Aspects and Special Cases

The withholding taxation of foreign workers in Switzerland is part of a complex international context, marked by double taxation treaties (DTT) and specific agreements with neighbouring countries.

Tax Treaties and Cross-Border Agreements

Switzerland has concluded double taxation treaties with more than 80 countries, the main objective of which is to prevent the same income from being taxed twice. These treaties determine which state has the right to tax the various categories of income.

Cross-border agreements constitute a particular area of international tax law:

• French cross-border workers: withholding tax in Switzerland for workers from the cantons of Berne, Solothurn, Basel-City, Basel-Country, Vaud, Valais, Neuchâtel and Jura, with financial compensation paid by Switzerland to France. For cross-border workers working in Geneva, exclusive taxation in Switzerland with payment of financial compensation to the departments of Ain and Haute-Savoie.
• German cross-border workers: shared taxation, with source deduction limited to 4.5% in Switzerland and additional taxation in Germany.
• Italian cross-border workers: exclusive taxation in Switzerland for the cantons of Ticino, Graubünden and Valais, with restitution of 40% of the tax levied to Italy.
• Austrian cross-border workers: exclusive taxation in Switzerland.

G permits are issued to cross-border workers who return at least once a week to their domicile abroad. Their tax treatment varies considerably depending on the country of residence and the canton of activity.

Special Taxation Cases

Certain categories of foreign workers are subject to specific rules:

• Artists, athletes and lecturers: application of special rate schedules with generally higher rates, calculated on gross income reduced by acquisition costs.
• Company directors: withholding tax on fees paid to non-resident members of boards of directors.
• Cross-border teleworkers: subject to constant evolution since the pandemic, with temporary tolerances tending to become permanent in certain bilateral agreements.

International mobility of workers raises specific questions, particularly concerning employees who divide their working time between several countries. In these situations, rules for allocating taxing rights apply, often requiring a case-by-case analysis.

Our law firm frequently intervenes in these complex cross-border situations, coordinating if necessary our action with colleagues from the countries concerned to guarantee a coherent approach to the client's international taxation.

Recent Developments and Current Challenges

The Swiss withholding tax system has undergone significant transformations in recent years, notably with the major reform that entered into force in 2021. This modernisation has brought welcome harmonisation but raises new practical questions.

Harmonisation and Digitalisation of Procedures

The formal harmonisation of rate schedules between cantons constitutes a major step forward, although tax rates remain variable. The digitalisation of procedures is accelerating, with electronic declaration and payment platforms that simplify administrative procedures for both employers and taxpayers.

Cantonal tax administrations are progressively developing online tools allowing:

• Electronic transmission of withholding tax statements
• Automated calculation of deductions
• Paperless management of SATO requests
• Secure communication between employers and tax authorities

This digital transition, although uneven across cantons, is profoundly changing administrative practices and reducing file processing times.

Practical Challenges and Strategic Advice

Several challenges characterise withholding taxation in the current context:

• The growing complexity of professional situations (multiple employment, international activity)
• The impact of teleworking on the determination of the place of taxation
• Coordination between national tax systems
• Access to relevant information for foreign taxpayers

Faced with these challenges, our law firm develops strategic approaches adapted to the profiles of foreign workers:

• Systematic cost-benefit analysis before any SATO request
• Tax planning for international mobility situations
• Assistance in tax correction procedures
• Advice on the optimisation of legal tax deductions

The recent jurisprudence of the Federal Supreme Court progressively clarifies certain contested points, notably concerning access to SATO for quasi-residents or the taxation of capital benefits from the second pillar. This jurisprudential evolution requires constant legal monitoring that our law firm ensures in order to guarantee our clients the most up-to-date advice.

The balance between administrative simplification and tax equity remains a permanent challenge of the withholding tax system. Foreign workers must be particularly vigilant as to their rights and obligations in this evolving context. A proactive approach, supported by specialised legal advice, makes it possible to avoid tax pitfalls while benefiting from the legal optimisation opportunities that the Swiss system continues to offer despite its progressive tightening.

Main Withholding Tax Rate Schedule Codes

Subsequent Ordinary Tax Assessment (SATO): Who May Benefit?

Frequently Asked Questions on Withholding Tax in Switzerland