Employment Contract Template: Part-Time with Pensum
A part-time employment contract in Switzerland must specify the Pensum (percentage of full-time hours) to avoid wage and overtime disputes. Swiss law allows flexible arrangements, but the contract must clearly state weekly/monthly hours, salary per Pensum, and how additional work is compensated. Common errors include vague hour definitions and failure to document actual versus contracted time.
Part-time work in Switzerland represents roughly 37% of employment. Yet many SMEs write vague Pensum clauses, leading to disputes over hours, pay, and overtime. This guide shows you what Swiss law permits and what a clear clause looks like.
The Obligationenrecht (OR, Articles 319–330) does not prescribe a standard working week; it requires only that terms be 'clear' and 'reasonable'. Pensum percentage is your anchor. The mistake: defining Pensum without stating actual hours or salary impact.
What Pensum Is and Why It Matters
Pensum (from Latin 'pensus', weighed) is the percentage of a standard full-time role. In Switzerland, full-time typically means 42–44 hours weekly (varies by canton and sector). A 50% Pensum employee works roughly 21–22 hours per week. It is the foundation of salary, benefits eligibility, and legal compliance.
Swiss law does not define 'full-time' nationally. Instead, collective bargaining agreements (GAV) or your canton's norms set the standard. When you hire, your contract must reference this baseline—otherwise your part-timer's rights and obligations remain ambiguous.
- Pensum is always expressed as a percentage (50%, 60%, 80%) or as absolute hours (20h/week).
- Salary scales proportionally: if full-time is CHF 60,000 and Pensum is 50%, monthly salary is CHF 2,500 (before deductions).
- Part-timers are entitled to proportional vacation (20 days full-time → 10 days at 50%), sickness, and accident leave.
- Pensum affects social insurance contributions (AHV, IV, EL, ALV) and Quellensteuer withholding.
- Your canton may have sectoral GAV minimums; check your industry association.
- Pensum does not equal 'on-call' or 'flexible hours unless expressly agreed in writing.
Core Contract Clauses for Part-Time Pensum
A robust part-time clause specifies: (1) Pensum as percentage or hours, (2) weekly schedule (e.g. 'Mon–Wed, 08:00–17:00'), (3) salary calculation tied to Pensum, (4) how extra hours are treated, and (5) notice periods. Vague wording ('flexible hours as needed') invites disagreement when the employee works 25 hours one month and 35 the next.
Swiss courts expect contracts to be binding, unambiguous, and in writing. A handshake agreement on part-time terms is risky. Even a one-page letter of engagement should include the Pensum clause and reference your standard terms.
- Template clause: 'Employee is engaged at 60% Pensum, equivalent to 25.2 hours per week, based on a standard 42-hour week in [Canton]. Schedule: [specify days/times].'
- Salary clause: 'Monthly gross salary CHF [amount] for 60% Pensum. Salary is calculated as [full-time salary] × 60% ÷ 12 months.'
- Overtime clause: 'Hours exceeding 60% Pensum are overtime and require written approval. Overtime is compensated at [time-off / 1.25× rate / as agreed].'
- If schedules vary, define a minimum and maximum band (e.g. '20–25 hours weekly') and state how variance is recorded and paid.
- Probation period: state explicitly (standard is 14 days for part-time; some contracts use 1 month).
- Notice period: 'Each party may terminate with one week notice to end of a calendar week,' or per your canton default (often 10 days).
Common Pitfalls and How to Avoid Them
Dispute #1: Creeping hours. You hire someone at 50% but they gradually work 70%. Without a written record and explicit overtime clause, they may claim back pay or overtime compensation. Always track actual hours in payroll or timekeeping software and review monthly.
Dispute #2: Salary confusion. Part-timers sometimes think they earn the same as full-timers for fewer hours. Your contract must state the proportional salary and explain deduction of social insurance. Use a written pay slip to reinforce this.
- Document Pensum in absolute hours AND as a percentage so there is no ambiguity.
- Use a timesheet or punch-clock system; do not rely on memory or informal tracking.
- State clearly: 'Salary is calculated on a proportional basis and reflects [X]% of the standard full-time salary.'
- If your part-timer can choose shifts from a roster, define the roster and approval process in writing.
- Clarify whether Pensum can change: if yes, require written consent and state notice period (e.g. 'one month in advance').
- Annual review: check whether actual vs. contracted hours match; if not, amend the contract or the schedule.
Frequently asked questions
- Can I hire a part-timer without a written Pensum clause?
- Legally, yes—an oral contract is binding under Swiss law (OR 320). Practically, no. Without writing, disputes over hours and pay are difficult to prove. Use at least a brief confirmation email stating 'Pensum 50%, CHF [amount] monthly' and keep it in your files.
- Do part-timers at 50% Pensum get half the vacation days?
- Yes, broadly. If full-time is 20 days, 50% Pensum is 10 days. However, Swiss law guarantees a minimum of 4 weeks per year if the role is deemed 'full employment' (this is rare for part-time). Check your canton and sector GAV; some set higher minimums.
- What if a part-timer regularly exceeds their Pensum—do they have to be paid extra?
- If they work beyond contracted hours with your knowledge and without explicit approval, courts may view it as a tacit agreement to pay. To avoid this: require written overtime approval, track hours rigorously, and pay extra promptly. If hours creep persistently, renegotiate the Pensum.
General information for Swiss employers, not legal advice. Have a lawyer confirm anything with legal consequences.