Swiss Telework Compliance Guide

Cross-Border Telework 2026: The Comparative Guide (FR/DE/IT) HR Guide

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Author: Brice DELHOME

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📌 In short: cross-border telework rules in Switzerland in 2026
  • One social security threshold for everyone: in 2026, whether a cross-border worker lives in France, Germany or Italy, the multilateral framework agreement on telework (in force since 1 July 2023) sets the same telework limit of 49.9%. Working 50% or more of their time in the country of residence switches them to that country's social security system (URSSAF, Deutsche Rentenversicherung, INPS).
  • Tax rules that differ by country: for residents of France, the 2023 additional agreement to the Franco-Swiss tax treaty, applicable since 1 January 2026, allows up to 40% telework per calendar year; Germany has no such "40% shield": cross-border workers under Art. 15a of the Germany–Switzerland treaty are taxed in Germany anyway, with Swiss withholding capped at 4.5%; in Italy, the cross-border workers agreement and its telework protocol limit telework to 25% to keep cross-border tax status.
  • The A1 certificate: mandatory for residents of France, Germany and Italy when they work in two states, telework included. It proves the employee is covered by Swiss social security and exempt from contributions in the country of residence; the employer requests it via the ALPS platform.
  • Proof of presence: during an audit, presence in Switzerland can be proven with badge logs, train tickets, parking receipts and lunch expenses in Switzerland.
  • The risk for the employer: employees who work significantly from their home country may lead foreign tax authorities to argue that the Swiss company has a fixed place of business there, exposing it to corporate tax abroad. That is why some Swiss employers cap telework in the employment contract.

For Swiss companies employing cross-border workers, 2026 brings clarity but also complexity. While social security rules are harmonized across Europe, tax rules differ drastically depending on whether your employee lives in France, Germany, or Italy.

Managing a mixed team? You cannot apply the "French rule" to a German resident. Doing so could expose your company to tax risks and your employees to double taxation.

This guide synthesizes the three regimes to help HR managers and employees stay compliant.

1. Which social security threshold applies to every cross-border worker?

Regardless of the country of residence (FR, DE, IT), the multilateral framework agreement on telework (in force since 1 July 2023) sets a hard limit to remain under the Swiss social security system. It covers telework between 25% and 49.9% of working time; below 25%, the ordinary coordination rules apply and the worker remains covered by Swiss social security.

🛡️ THE 49.9% SAFETY NET

Cross-border workers must work less than 50% of their time in their country of residence. Exceeding this triggers a switch to the foreign social security system (URSSAF, Deutsche Rentenversicherung, INPS), creating massive costs and compliance issues for the Swiss employer.

2. How is telework taxed in France, Germany and Italy?

This is where compliance gets tricky. The "safe harbor" for tax varies significantly.

Country of ResidenceTax Rule for TeleworkKey Risk
🇫🇷 France40% Limit. The 2023 additional agreement, applicable since 1 January 2026, allows up to 40% remote work per calendar year without changing the place of taxation*.Low. Clear legal framework if under 2 days/week.
🇩🇪 GermanyCross-border workers under Art. 15a of the Germany–Switzerland treaty (regular return home): salary taxed in Germany, Swiss withholding capped at 4.5% (Gre-1 residence certificate); full home-office days do not count as non-return days (consultation agreement of 26 July 2022). Without that status: days worked in Germany are taxed there.Medium. Check the cross-border status; a salary split only applies to workers without it.
🇮🇹 ItalyAgreement in force since 17 July 2023, applied since 1 January 2024. "New" frontaliers are taxed concurrently. Telework is limited to 25% to maintain fiscal status.Medium. Strict tracking required to distinguish "Old" vs "New" frontaliers.

*The 40% rule mainly matters for cross-border workers taxed at source in Switzerland, typically those employed in Geneva: according to the State Secretariat for International Finance (SIF), telework remuneration remains taxable in the employer's state up to 40% of working time per calendar year. Above that limit, all telework days become taxable in France from the first day. Cross-border workers employed in one of the eight cantons of the Franco-Swiss agreement of 11 April 1983 (Bern, Solothurn, Basel-Stadt, Basel-Landschaft, Vaud, Valais, Neuchâtel and Jura) are taxed on their salary in France, their state of residence, according to the French tax authorities' official bulletin (BOFiP).

3. What is the "permanent establishment" risk for the employer?

Why are Swiss employers so strict about telework caps? It's not just about productivity; it's about Corporate Tax.

If employees work significantly from their home country (FR/DE/IT), foreign tax authorities may argue that the Swiss company has a "fixed place of business" abroad. This could lead to:

  • The Swiss company paying Corporate Income Tax in the foreign country.
  • Retroactive tax audits.
  • Complex legal obligations abroad.

HR practice: capping telework in the employment contract, for example at 40% for employees resident in France, limits this risk.

4. Why is the A1 certificate mandatory?

Whether your employee is French, German, or Italian, the A1 Certificate is mandatory. It proves they are covered by Swiss social security and exempt from paying contributions in their home country. According to the Swiss Federal Social Insurance Office (FSIO), the employer applies to its OASI compensation office via ALPS (Applicable Legislation Portal Switzerland); an A1 certificate issued under the framework agreement is valid for up to 3 years and renewable, and for applications filed since 1 July 2024 it can only be backdated by 3 months.

EMPLOYER OBLIGATIONS
  • Apply via ALPS: Use the digital platform to request A1 forms for all cross-border staff.
  • Track Days: Implement a robust tracking system (badging) to prove presence in Switzerland during audits.
EMPLOYEE OBLIGATIONS
  • Keep Proofs: Train tickets, parking receipts, and lunch expenses in Switzerland.
  • Carry the A1: Always have a digital or paper copy of the certificate when traveling.

5. How can cross-border workers limit the cost of currency exchange?

For cross-border workers, the administrative load is heavy, and currency exchange weighs on the net salary every month.

💡 THE IBANI TIP

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To measure this cost concretely, convert your Swiss salary into euros on our CHF/EUR converter: ibani converts at the real market rate, plus a margin of 0.40% to 0.15% depending on the amount.

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Frequently Asked Questions

How many days of telework can a cross-border worker living in France do in 2026?

For tax purposes, up to 40% of working time per calendar year, i.e. about 2 days a week for a full-time job, under the 2023 additional agreement to the Franco-Swiss tax treaty, applicable since 1 January 2026. For social security, the multilateral framework agreement allows the worker to remain covered by Swiss social insurance up to 49.9%, provided the employer applies for an A1 certificate.

What happens if a cross-border worker exceeds 40% telework?

For a cross-border worker taxed at source in Switzerland, typically in Geneva, telework remuneration only remains taxable in Switzerland up to 40%. Beyond that, the salary for all telework days in France falls under French tax, from the first day. The Swiss employer may also face the recognition of a permanent establishment in France, and therefore French corporate tax on part of its profits.

Who must apply for the A1 certificate of a teleworking cross-border worker?

The Swiss employer applies to its OASI compensation office, on the ALPS platform (Applicable Legislation Portal Switzerland). The certificate issued under the framework agreement on telework is valid for up to 3 years and renewable. For applications filed since 1 July 2024, it can only cover 3 months retroactively, so it is best requested as soon as telework starts.

How does a cross-border worker prove their days of presence in Switzerland?

In an audit, the burden of proof lies with the taxpayer. Badge records provided by HR, travel validation histories (SBB, SNCF) and expenses made near the office on the days declared are the strongest evidence. A monthly pass, an Outlook calendar or a sworn statement alone is not enough to establish presence on a given day.

Does the 40% threshold apply in the same way to a cross-border worker in Vaud and one in Geneva?

No. A cross-border worker employed in one of the eight cantons of the agreement of 11 April 1983 (Bern, Solothurn, Basel-Stadt, Basel-Landschaft, Vaud, Valais, Neuchâtel, Jura) is taxed on their salary in France, their state of residence, telework days included. A cross-border worker employed in Geneva is taxed at source in Switzerland: for them, the 40% threshold of the additional agreement determines where telework days are taxed.

Official sources