What is the difference between ZertES and eIDAS for Swiss businesses?

ZertES (SR 943.03) is the Swiss Federal Act on Electronic Signatures, governing electronic signatures and related trust services within Switzerland. eIDAS (EU Regulation No. 910/2014) is the EU's equivalent framework, applicable across all 27 EU member states. For Swiss businesses, ZertES governs transactions with Swiss counterparties, Swiss courts, and Swiss public authorities. If your contracts, documents, or IP evidence will be presented in EU member state courts or to EU entities, eIDAS-compliant qualified trust services are required. Swiss Trust Layer issues timestamps that comply with both ZertES and eIDAS-equivalent standards, making them valid in both Switzerland and the EU.

Does Switzerland have a bilateral agreement with the EU on electronic signatures?

Switzerland is not an EU member and is not directly subject to the eIDAS Regulation. However, Switzerland has aligned ZertES with eIDAS standards to ensure broad mutual recognition in practice. Swiss-issued qualified electronic signatures and timestamps issued by providers accredited under ZertES are generally recognised in EU proceedings, particularly in countries with strong bilateral trade ties to Switzerland (Germany, Austria, France, Italy). For critical cross-border matters, Swiss Trust Layer recommends using a provider that holds accreditation under both ZertES and an EU QTSP framework to eliminate any recognition risk.

Can a Swiss company use ZertES timestamps to prove IP ownership in EU courts?

Yes, in practice. Swiss-issued qualified electronic timestamps from a provider meeting both ZertES SR 943.03 and eIDAS Art. 42 technical standards are accepted in EU court proceedings. The key requirement is that the timestamp be issued by a provider on an EU Trusted List or using technology meeting eIDAS Annex III standards. Swiss Trust Layer's qualified timestamp service meets these requirements, making timestamps suitable as IP creation date evidence in both Swiss cantonal courts and EU member state courts.

Which Swiss law applies to electronic signatures on business contracts?

Swiss business contracts are primarily governed by the Swiss Code of Obligations (OR/CO). For qualified electronic signatures, ZertES SR 943.03 and its implementing ordinances (VZertES/OCertES, SR 943.032) define the technical and procedural requirements. ZertES distinguishes between advanced electronic signatures (FES/SES) and qualified electronic signatures (QES/SEQ), and only the latter is legally equivalent to a handwritten signature for documents requiring written form under the OR. For documents that do not require written form, an advanced electronic signature or even a simple electronic confirmation may suffice.

What does a qualified electronic timestamp prove under Swiss law?

Under ZertES SR 943.03 and Article 14 of the implementing ordinance, a qualified electronic timestamp from a recognised Swiss certification service provider creates a legal presumption that the timestamped data existed in its exact, unaltered form at the date and time stated. This presumption is rebuttable. A party challenging it must prove the timestamp is inaccurate, but it significantly shifts the burden of proof in any Swiss court or regulatory proceeding. For IP protection, this means a qualified timestamp on your creative work, invention description, or business document establishes a court-admissible creation date without requiring additional evidence of authenticity.

Standards Compliance

ZertES vs. eIDAS: Was Schweizer Unternehmen 2026 wissen müssen

Swiss Trust Layer Team · Compliance & Legal

15. Mai 2026 9 Min. LesenZuletzt aktualisiert 21. August 2026

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In short

Verstehen Sie den Unterschied zwischen ZertES (Schweiz) und eIDAS (EU) für die Dokumentenunterzeichnung. Welcher Standard gilt — und ist Ihr Unternehmen compliant?

Im Januar 2025 unterzeichnete ein in Zurich ansassiges SaaS-Unternehmen einen Lizenzvertrag mit einem Berliner Unternehmenskunden. Der Vertrag war eine Standard-PDF-Datei, datiert und von beiden Parteien ausgefuhrt. Vierzehn Monate spater bestritt der Berliner Kunde den Umfang einer Verlangerungsklausel und stellte infrage, ob ein unterzeichneter Nachtrag vor oder nach dem Hauptvertrag erstellt worden war. Das Zurcher Unternehmen konnte die Dokumentenreihenfolge nicht nachweisen. Ein deutsches Gericht forderte einen qualifizierten elektronischen Zeitstempel an. Es gab keinen. Der Streit kostete das Zurcher Unternehmen CHF 320'000 an Rechts- und Schiedskosten, bevor es zu einer Einigung kam.

Wenn Ihr Unternehmen in der Schweiz oder in der EU tatig ist, werden Sie in jedem Gesprach uber rechtsverbindliche digitale Signaturen immer wieder auf zwei Namen stossen: ZertES und eIDAS. Beide regeln, wann eine digitale Signatur dieselbe Rechtskraft wie eine handschriftliche Unterschrift hat. Sie gelten jedoch in unterschiedlichen Rechtsordnungen, werden von unterschiedlichen Behorden ausgestellt und haben unterschiedliche Auswirkungen auf die Zulassigkeit vor Gericht und die grenzuberschreitende Anerkennung.

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