What Swiss Law Actually Says About the 13th Salary
No single article of the Swiss Code of Obligations mandates a 13th salary for all employers. Articles 322, 322a and 322d govern remuneration, profit participation and gratifications respectively - but none requires an extra month of pay. The source of entitlement is always the employment contract, the applicable collective labour agreement (CLA), or company policy.
The distinction matters enormously in practice. The moment a 13th salary is defined in the contract as a fixed component of the annual remuneration, it becomes legally owed pro-rata for any months worked. The employer cannot unilaterally reduce or suppress it. This is the critical difference from a discretionary gratification - which can be adjusted freely unless contractual practice has converted it into an acquired right through consistent payment over several years.
Our view at Fed Group is clear: when negotiating a package, push for explicit written confirmation of the 13th salary in the contract - not just in a verbal offer or job description. Negotiating your salary in Switzerland requires knowing exactly what is contractually locked in.
13th Salary vs. Gratification vs. Bonus: Legal Differences
| Component | Legally required | Pro-rata on departure | Employer can reduce |
| 13th salary (defined in contract/CLA) | Yes, once contracted | Yes - owed pro-rata | No |
| Discretionary gratification | No | Yes, pro-rata if habitually paid | Yes - can be reduced or cancelled |
| Performance bonus | No (unless targets are met) | Depends on the contract | Yes - subject to results |
The 13th AVS Pension vs. the 13th Salary: Do Not Confuse the Two
Since 2026, Switzerland introduced a 13th AVS pension for retirees, following a popular initiative accepted in 2024. This measure is entirely separate from the 13th salary for active employees. Retirees receive an additional pension equivalent to one month's AVS benefit. Working employees are not affected by this reform in their salary calculations.
How to Calculate Your 13th Salary in 2026
The base principle is straightforward: the 13th salary equals one additional month of gross pay. Complexity arises with pro-rata situations, absences, or part-time arrangements.
Standard Case: Full Year of Employment
13th salary (gross) = Monthly gross salary
Marc is an engineer at a Zurich manufacturer earning CHF 9,000 gross per month. His 13th salary gross is CHF 9,000, typically paid in December or split into two tranches (June and December, depending on the CLA). What reaches his bank account is the question that follows.
Pro-Rata Case: Joining or Leaving During the Year
The formula:
13th salary (gross) = (Monthly gross salary × months worked) ÷ 12
Example: Sophie joined on 1 April 2026 at CHF 7,200 per month. She has worked 9 months. Her 13th salary gross: (7,200 × 9) ÷ 12 = CHF 5,400.
Important nuance: some CLAs count in twelfths per complete month worked. If Sophie joined on 15 April, whether April counts depends on the specific CLA provision.
Part-Time Employment
Part-time work does not change the logic - the 13th is calculated from the actual monthly salary received. A 60% position paying CHF 5,400 per month generates a 13th salary of CHF 5,400 for a full year, or the pro-rata equivalent.
Deductions on the 13th Salary in 2026
The 13th salary is subject to the same social contributions and taxes as regular monthly salary. There is no special exemption or preferential treatment - it is ordinary salary in an extra month.
AVS, AC and Accident Insurance
The 2026 employee rates are:
- AVS/AI/APG: 5.3% of gross salary, with no ceiling
- Unemployment insurance (AC): 1.1% up to CHF 148,200 annual salary
- AC solidarity contribution: 0.5% on the tranche CHF 148,200–370,500
- AANP (non-occupational accident): approximately 1–1.5% depending on employer and sector
LPP (Occupational Pension)
The 13th salary forms part of the LPP-determining salary (Art. 7 LPP). In 2026, affiliation is mandatory from CHF 22,680 in annual salary. The coordination deduction stands at CHF 26,460. The coordinated salary - the basis for LPP contributions - is therefore the annual salary (including the 13th month) minus CHF 26,460. Contribution rates vary by age and the pension fund plan.
Withholding Tax
For employees subject to withholding tax (impôt à la source), the 13th salary is included in the annualised income. Most cantons smooth the tax impact by annualising the income of the payment month, preventing an artificially elevated rate in December alone. Geneva's withholding tax schedule already accounts for the 13th salary in the monthly calculation.
Full Simulation: Marc, Engineer in Zurich
Monthly gross salary: CHF 9,000 / Full year / Age 35
| Component | Amount (CHF) |
| 13th salary gross | 9,000 |
| AVS/AI/APG (5.3%) | − 477 |
| AC (1.1%) | − 99 |
| AANP (~1.2%) | − 108 |
| LPP (estimate ~4% based on plan) | − 230 |
| 13th salary net (before tax) | ~8,086 |
| Withholding tax (Zurich, varies by family tariff) | Variable |
LPP amounts vary by pension fund and age. Withholding tax depends on canton and family situation. These figures are illustrative estimates.
What Companies and Employees Frequently Get Wrong
The classic employer mistake is paying a 13th salary without defining its legal nature clearly in the contract. If the wording reads "discretionary year-end bonus" but payment has been consistent for three or more years, Swiss case law frequently holds that an acquired right has formed and the employer can no longer suppress it unilaterally. The employer who then tries to eliminate it faces a labour dispute.
The employee error runs in the opposite direction: accepting an offer without verifying whether the 13th salary is included in the advertised monthly amount or added on top. A role advertised at CHF 8,000 per month could represent CHF 96,000 annually without a 13th, or CHF 104,000 with - a gap of CHF 8,000 gross. To assess whether a salary matches what counts as a good salary in Switzerland, always benchmark on a 13-month annual basis.
Overtime and the 13th Salary
Some employers - particularly in construction and industrial CLAs - include the 13th salary within the hourly rate, resulting in a slightly higher advertised rate with no separate December payment. Check whether your contract states "13th salary included in hourly rate" before negotiating a raise, or the comparison will not be like-for-like.
Financial Planning Around the 13th Salary
Receiving an extra month's salary is a planning opportunity. The three highest-return uses, roughly ranked:
- Voluntary LPP buy-in - contributions are deductible from taxable income and generate an immediate tax return that typically exceeds standard investment yields in Switzerland
- Pillar 3a contribution - the 2026 deductible ceiling for employees is CHF 7,258 (confirm with your tax authority); this reduces the current year's taxable income directly
- Emergency fund - building or restoring 3–6 months of fixed expenses in liquid savings remains the foundation before any other allocation
The 13th salary also increases the year's taxable income and may push marginal rates higher if income sits near a significant bracket threshold. Review the timing with a tax adviser before year-end, particularly if a voluntary LPP purchase can offset the income increase. For a comprehensive view of how gross converts to net in Switzerland and how deductions work across cantons, our reference guide covers the full picture.
Frequently Asked Questions
Is the 13th salary mandatory in Switzerland?
Not under federal law alone. It becomes mandatory the moment it is established in the employment contract, the applicable CLA, or consistently paid company practice. For 80–90% of Swiss employees, one of these conditions applies.
When is the 13th salary paid?
Timing varies by CLA and contract. December is the most common schedule. Some CLAs split it: half in June alongside the holiday period, half in December.
What happens to the 13th salary if I resign mid-year?
If your contract or CLA establishes a 13th salary entitlement, you are owed the pro-rata share for months worked. This must appear in your final payslip. If the employer refuses, it constitutes a salary claim recoverable before the cantonal conciliation authority under the Code of Obligations.
Does the 13th salary affect my unemployment insurance (AC) calculation?
Yes. The 13th salary is included in the insured earnings for AC purposes, within the CHF 148,200 annual ceiling. This means a higher 13th salary does increase the AC benefit base, up to that limit.
Does the 13th salary apply during the trial period?
The pro-rata for months worked during the trial period is included in the entitlement. If the contract is terminated during the trial period, the pro-rata 13th should appear in the final settlement. For questions about salary payment deadlines in Switzerland, the legal rules are clear about the employer's obligations at termination.
Read Also
- Gross and Net Salary in Switzerland: How to Calculate What You Actually Take Home
- Salary in Switzerland in 2026: What You Really Need to Know Before Signing
- Negotiating and Renegotiating Your Salary in Switzerland
- Salary Payment Date in Switzerland: What the Law Says
- Financial Controller Salary in Switzerland: 2026 Guide
