How is tax at source calculated for a part-time?

The tax at source is withheld by the employer in Switzerland on the basis of the gross income received. Rates are set by federal and cantonal laws. For frontier workers, this tax is the only withholding on labour income, while in Italy the tax credit is applied to avoid double taxation.

Are part-time workers entitled to LPP occupational pension?

Yes, if your annual income exceeds the statutory minimum occupational pension threshold. The obligation to join the LPP/BVG is triggered for workers who have reached the age of 25, with contributions paid by the employer and the employee in percentages varying between 7% and 18% depending on age.

What insurance is mandatory for a frontier worker?

In addition to social contributions (AVS/AI/IPG/AD), the worker must be covered against accidents (LAINF, usually paid by the employer) and has the obligation of health insurance (LAMal/KVG), for which G border workers can exercise the right of option.

Part-time work in Switzerland: rights and contract (cross-border guide)

Di Redazione Frontaliere Ticino · Published on 29 July 2026

Modern office with a view of a Swiss city

Practical guide on contract rights, social security contributions and taxation for part-time workers in Switzerland.

Context

In a nutshell

Part-time work provides for rights proportional to full-time work.
AVS/AI/IPG/AD contributions are mandatory in proportion to salary.
Tax at source is only withheld in Switzerland for frontier workers.
Switzerland is not an EU/EEA member, influencing contractual dynamics.

Key facts

What: Contractual rights for part-time work.
When: In force with current legislation.
Where: Swiss Confederation.
Who: SECO, AFC/ESTV, BFS.
Contributions: AVS/AI/IPG 5.3% employee, AD 1.1%.

Part-time work in Switzerland is governed by a regulatory framework that guarantees equal treatment with full-time employees. According to the SECO directives, the employment contract must clearly specify the employment rate and the expected tasks. For frontier workers, it is essential to remember that income tax at source is withheld only in Switzerland, while Italy avoids double taxation through the tax credit in the EC framework of model 730. The new Frontier Agreement, signed on 23 December 2020 and entered into force on 1 January 2024, defines the current framework. It is essential to point out that Switzerland is not an EU/EEA member, which implies an autonomous management of employment relations. Reference bodies for social security and taxes, such as the AFC/ESTV for taxation and the FOPH/BAG for health, operate according to federal and cantonal laws

Operational details

Contractual and Pension Implications

Working part-time in Switzerland allows you to benefit from paid leaves and permits in proportion to your level of employment. A part-time employee with a 50% contract will enjoy the same rights in percentage terms as a full-time colleague. In the area of pension insurance, the second pillar (LPP/BVG) follows age bands and contributions that vary from 7% to 18%. It is crucial to monitor the payment of contributions, as these directly affect future income. Regarding the tax regime, frontalieri must manage their tax declaration in Italy using the tax credit to avoid double taxation, in accordance with the Convention against Double Taxation signed on December 9, 1976. For 'old' frontalieri, active before July 17, 2023, a 7,500 euro exemption is provided in the transitional regime 2024–2033, while for 'new' frontalieri the franchise is set at 10,000 euros. The calculation of net salary must consider mandatory deductions such as LAINF (accident insurance), which ranges from 0.7% to 1.5%. Those residing in Italy and working in Switzerland have the right to opt for LAMal (health insurance), with franchise rates varying between 300 and 2,500 CHF. It is not uncommon for the employer to request proof of insurance coverage. The difference between the regime before 2024 and the current one requires a careful review of the individual tax position with the Revenue Agency. Using calculation tools net salary allows for a precise estimate of pension and tax deductions, avoiding surprises in the pay slip. The transparency of the contract is guaranteed by federal laws that require the employer to provide a detailed breakdown at each payment. The correct management of the second pillar is equally important for those planning a long-term career in the…

Key points

Operational Procedure for Part-Time Employees

For those starting a part-time employment relationship, the procedure requires first signing a written contract that specifies the level of employment and the hourly or monthly salary. It is necessary to request the datore di lavoro to count the deductions AVS/AI, LPP and LAINF, ensuring they comply with the current tables. For the frontaliers, the key step is the correct management of the tax withholding form, which must be submitted to the cantonal tax authority of reference. In the case of opting for the LAMal, the procedure involves communicating the option within the terms established by law to avoid penalties or the imposition of force. Regarding the pension, it is advisable to request an AVS/AHV statement to verify that the contributions paid are correctly registered. In case of doubts about one's fiscal or contributory position, it is possible to refer to the official guides of the AFC/ESTV or the Federal Office of Taxes. Financial planning should not be limited to the net salary; it is advisable to also consider the advantages of a third pillar to optimize the overall tax burden, especially for those with a higher income that falls into the Italian IRPEF brackets (23%, 35% or 43%). The documentation related to the contributions paid in Switzerland must be kept carefully, as it will be necessary for the tax return in Italy, where the MEF establishes the modalities of applying the tax credit. Remember that any modification to the employment contract, such as an increase in the level of employment, must be formalized for record to ensure the correct application of social charges. For a complete overview of one's pay slip and the sustainability of the cost of living, it is recommended to use regularly the salary…

Frequently Asked Questions

How is tax at source calculated for a part-time?: The tax at source is withheld by the employer in Switzerland on the basis of the gross income received. Rates are set by federal and cantonal laws. For frontier workers, this tax is the only withholding on labour income, while in Italy the tax credit is applied to avoid double taxation.
Are part-time workers entitled to LPP occupational pension?: Yes, if your annual income exceeds the statutory minimum occupational pension threshold. The obligation to join the LPP/BVG is triggered for workers who have reached the age of 25, with contributions paid by the employer and the employee in percentages varying between 7% and 18% depending on age.
What insurance is mandatory for a frontier worker?: In addition to social contributions (AVS/AI/IPG/AD), the worker must be covered against accidents (LAINF, usually paid by the employer) and has the obligation of health insurance (LAMal/KVG), for which G border workers can exercise the right of option.