Blog, HR & Payroll: 27.10.26Onboarding a new employee in Switzerland: the legal obligations from day one

The logic of Swiss employment law is simple: the employer’s legal obligations arise when the contract is concluded, not with the first coffee at the office. Three areas need to be secured before the employee physically arrives.

The employment contract. The Swiss Code of Obligations imposes few formal requirements (art. 319 ff. CO), but a written contract is a sensible minimum for any SME. It sets the salary, working hours, probation period, holidays and notice period. It must include the provisions required by the Labour Act (maximum working hours, breaks, rest periods) and by any applicable sector-wide collective labour agreement. A contract signed the day before arrival is still better than one slipped onto the desk on Monday morning.

The work permit. The procedure depends on the employee’s nationality. EU or EFTA nationals: an online notification to the State Secretariat for Migration is enough for a short assignment (L permit up to three months), and an application for a B permit is filed for longer employment. Third-country nationals: prior authorisation from the competent cantonal office is mandatory. In Geneva, the foreign workforce department of the OCIRT decides whether to grant it, and the OCPM then issues the permit to the worker. Throughout the procedure, the employer may not let the employee start work, however urgent the operational need. Starting work without a valid permit exposes the company to criminal penalties under art. 117 of the Foreign Nationals and Integration Act (FNIA): a custodial sentence of up to one year or a monetary penalty, increased to three years in serious cases. The notion of employer is broad and covers the de facto employer, not only the employer in the civil-law sense.

Social insurance affiliations. Before arrival, the employer must make sure that the AVS compensation fund is informed of the new employment relationship (notification due when work actually starts), that affiliation to the LPP pension fund is ready (from an annual salary of CHF 22,680 in 2026, the LPP entry threshold), and that compulsory accident insurance (LAA) covers the employee from day one. Without LAA cover, an accident on the first afternoon becomes a direct financial exposure for the employer.

The first day is not strictly an administrative day, but four points must be settled for the employment relationship to start properly.

The contract signed in two copies, one for each party. The job description handed to the employee, separate from the contract itself, setting out the role and responsibilities. The company’s internal regulations (if any), in particular the rules on remote work, safety, confidentiality and data protection. The safety checks and mandatory training for the position (SUVA, hygiene, first aid where relevant to the sector).

The employee’s personal administrative documents, to be requested at the same time: a copy of the residence or settlement permit, a health insurance certificate, bank details for salary payments and the information needed for notification to the cantonal family allowance fund.

Some steps do not have to be completed before arrival but must be dealt with in the following days, otherwise they apply retroactively.

Withholding tax. For any employee holding a B, F, L or N permit, the employer becomes responsible for collecting withholding tax from the first payroll. Notification to the cantonal tax authority (in Geneva, the Cantonal Tax Administration) must be made within the month. The applicable rate depends on the canton of residence, family situation and activity rate. Applying the wrong rate leads to a correction that can go back up to three years.

Affiliation to the family allowance fund. Mandatory for every Swiss employer, it is specific to the canton where the company is located. It determines the employee’s entitlement to child and birth allowances.

Daily sickness allowance insurance. Not required by federal law, but often imposed by a sector-wide collective labour agreement or by internal regulations. It protects the employer against the risk of prolonged salary payments in case of incapacity due to illness.

The collective labour agreement (CLA). If the sector is covered by a CLA declared generally binding (cleaning, hospitality, construction, hairdressing and several others), its minimum conditions on pay, working hours and joint fund contributions apply automatically. A back-payment of contributions to the joint funds can go back several years if affiliation was not made.

Swiss law leaves little room for nuance when an employer obligation is not met. These are the most frequent scenarios in the mandates we handle.

Missing LAA cover discovered after an accident: the employer bears all the benefits that SUVA or the private insurer would have paid, plus civil liability towards the employee.

Starting work without a valid permit: cantonal administrative sanctions, criminal penalties under art. 117 FNIA (a custodial sentence of up to one year or a monetary penalty, increased to three years in serious cases), and criminal exposure for the business owner, including as de facto employer.

The wrong withholding tax rate applied for two years: a retroactive correction with late-payment interest, and sometimes direct recovery from the salary of an employee who has already left the company.

A forgotten LPP affiliation for an employee above the entry threshold: back-payment of employer and employee contributions over several years, plus interest and fees, plus the rebuilding of retirement savings.

These situations are not rare. They come up almost every time we take over a mandate and review the affiliations a new client already has in place.

At Synergix, every new hire automatically triggers our checklist of notifications and checks, precisely so that this kind of problem does not resurface three years later.

At Synergix, we take care of the administrative side of every new hire for the companies we work with. In practice, this covers the AVS notification and the adjustment of payroll-related accruals, the LPP notification and the employee’s affiliation, the withholding tax notification where applicable, coordination of permits and employment contracts, through to cantonal family allowances. Our services are described in detail on our HR and payroll page.

For a business owner, it comes down to one thing: sending us the employee’s personal documents and a copy of the signed contract. We handle the rest, on time, before the first payroll goes out. The general logic of what the fiduciary takes on and what remains with the employer is explained in our article on what outsourcing payroll really means in Switzerland.

What this changes for a business owner: an administrative HR task that drops off their radar. No more deadlines to track between the employee’s arrival and the first payroll, no more risk of discovering at year end that an affiliation was forgotten, no more coordination between funds, cantons and authorities. The time freed up goes back to what really matters for running the company.

A Swiss employment contract is not frozen on the day it is signed. It changes with adjustments to working hours, salary increases, changes of role and developments in federal and cantonal law. Each of these changes triggers parallel updates: recalculation of contributions, adjustment of the withholding tax rate, updating of affiliations. A well-managed onboarding is the starting point of an HR file that holds up over time. A rushed onboarding is a file that catches up with you three years later.

All the steps above have one thing in common: they happen behind the scenes, without the employee necessarily being aware of them. Good administrative onboarding is invisible to the employee and secure for the employer. The new hire discovers their role, their team and their working environment. They should not have to discover at the same time that a document is missing from their file, that their permit is not valid or that their withholding tax has not been reported. That invisibility is what makes the process work.