Audit Engagement Letter Template for Switzerland

When conducting an audit in Switzerland, you must establish a formal contractual relationship with your audit firm through an Audit Engagement Letter. This document serves as the legal foundation for your audit engagement and ensures compliance with Swiss regulatory requirements. Understanding its components and legal implications helps you navigate the audit process effectively while protecting your company's interests.

When do you need this document?

You need an Audit Engagement Letter before any audit work begins in Switzerland. This requirement applies whether you're a public company subject to ordinary audit requirements under the Swiss Code of Obligations, or a smaller entity requiring a limited audit review. The letter becomes essential when engaging a new audit firm, renewing existing audit relationships, or when there are significant changes to your company structure or audit scope. Listed companies and entities with public interest must ensure their engagement letters meet enhanced requirements under Swiss Federal Audit Oversight Authority regulations. You'll also need this document when your Board of Directors formally appoints auditors or when changing from limited to ordinary audit requirements due to company growth.

Key legal considerations

Your Audit Engagement Letter must clearly define the audit scope, methodology, and level of assurance being provided. Under Swiss Auditing Standards, the letter should specify whether you're receiving an ordinary audit with full assurance or a limited review with reduced assurance. Management responsibilities must be explicitly outlined, including your obligations to provide complete financial records, maintain adequate internal controls, and ensure access to all relevant documentation. The agreement should address auditor independence requirements, potential conflicts of interest, and compliance with Swiss professional standards. Fee arrangements, reporting timelines, and communication protocols need clear definition to prevent disputes. Consider including provisions for additional services, changes in audit scope, and termination procedures to protect both parties' interests.

Legal requirements in Switzerland

Swiss law mandates specific content and compliance standards for audit engagement letters. Under the Swiss Code of Obligations Articles 727-731a, your letter must address statutory audit requirements appropriate to your company size and structure. The Federal Act on the Licensing and Oversight of Auditors requires confirmation that your chosen audit firm holds proper Swiss licensing and meets independence criteria. Your engagement letter must reference compliance with Swiss Auditing Standards, which align with International Standards on Auditing while incorporating Swiss-specific requirements. Data protection obligations under the Federal Act on Data Protection must be addressed, particularly regarding handling of sensitive financial information. The letter should confirm the audit firm's registration with the Swiss Federal Audit Oversight Authority and their commitment to regulatory reporting requirements. Additionally, mandate agreement principles under Swiss Civil Code Article 398 apply, ensuring proper contractual foundation for the professional relationship.