Independent Assurance Report

on the Sonova Corporate Responsibility Reporting 2020/21


We have been engaged to perform assurance procedures to provide limited assurance on the aspects of the 2020/21 Corporate Responsibility (CR) Reporting of Sonova Holding AG, Stäfa and its consolidated subsidiaries (“Sonova Group”).

Scope and subject matter

Our limited assurance engagement focused on the selected CR indicators for the year ended on 31 March 2021 published on Sonova’s website(1) marked with (×) PwC CH and summarized in the GRI content index:

  • the tables disclosed in the sections ‘Advancing our people’ and ‘Protecting the planet’ marked with (×) PwC CH; and
  • the management of reporting processes with respect to the CR Report and the preparation of CR indicators as well as the related control environment in relation to data aggregation of CR indicators.


The management reporting processes with respect to the CR reporting and CR indicators were prepared by Sonova Group based on the internal policies and procedures as set forth in the following:

  • the Sonova Group internal CR reporting guidelines based on the ‘GRI Standards’ published in October 2016 by the Global Reporting Initiative;
  • the Sonova Group internal reporting manuals ’Environmental Reporting’ dated 31st of March 2020 and ‘HR KPI Calculation Factsheet’; and
  • Procedures, by which the data for the CR indicators reporting is gathered, collected and aggregated internally.

Inherent limitations

The accuracy and completeness of CR indicators are subject to inherent limitations given their nature and methods for determining, calculating and estimating such data. Our assurance report should therefore be read in connection with Sonova’s internal guidelines, definitions and procedures on the CR reporting.

Sonova’s responsibility

The Board of Directors of Sonova Holding AG is responsible for both the subject matter and the criteria as well as for the selection, preparation and presentation of the selected data and information in accordance with the criteria. This responsibility includes the design, implementation and maintenance of related internal control relevant to this reporting process that is free from material misstatement, whether due to fraud or error.

Our responsibility

Our responsibility is to express a limited assurance conclusion on whether anything has come to our attention to indicate that the identified CR information selected and contained in this report and as published on Sonova’s website(1) and marked with (×) PwC CH is not stated, in all material respects, in accordance with the reporting criteria.

We planned and performed our procedures in accordance with the International Standard on Assurance Engagements (ISAE 3000) (Revised) ‘Assurance engagements other than audits or reviews of historical financial information’, and, in respect of greenhouse gas emissions, with the International Standard on Assurance Engagements (ISAE 3410) ‘Assurance Engagements on Greenhouse Gas Statements’. These standards require that we plan and perform the assurance engagement to obtain limited assurance on the identified sustainability information prepared, in all material aspects, in accordance with Sonova’s internal policies and procedures.

A limited assurance engagement under ISAE 3000 (Revised) and ISAE 3410 is substantially less in scope than a reasonable assurance engagement in relation to both the risk assessment procedures, including an understanding of internal control, and the procedures performed in response to the assessed risks. Consequently, the nature, timing and extent of procedures for gathering sufficient appropriate evidence are deliberately limited relative to a reasonable assurance engagement and therefore less assurance is obtained with a limited assurance engagement than for a reasonable assurance engagement. The procedures selected depend on the assurance practitioner’s judgement.

Our independence and quality control

We are independent of the Sonova Group in accordance with the International Code of Ethics for Professional Accountants (including International Independence Standards) issued by the International Ethics Standards Board for Accountants (IESBA Code) that are relevant to our audit of the financial statements and other assurance engagements in Switzerland. We have fulfilled our other ethical responsibilities in accordance with the IESBA Code.

Our firm applies International Standard on Quality Control 1 and accordingly maintains a comprehensive system of quality control including documented policies and procedures regarding compliance with ethical requirements, professional standards and applicable legal and regulatory requirements.

Summary of the work performed

Our assurance procedures included, amongst others, the following work:

  • Evaluation of the application of Group guidelines
    Reviewing the application of the Sonova Group internal CR reporting guidelines;
  • Site visit and management inquiry
    Remote site visit procedures at Sonova USA Inc. The selection was based on quantitative and qualitative criteria;
    Interviewing personnel responsible for internal reporting and data collection at the site and at the Sonova Corporate level;
  • Assessment of the key figures
    Performing tests on a sample basis of evidence supporting selected CR indicators concerning completeness, accuracy, adequacy and consistency;
  • Review of documentation and analysis of relevant policies and principles
    Reviewing relevant documentation on a sample basis, including Sonova Group CR policies, management of reporting structures and documentation.


Based on our work performed nothing has come to our attention causing us to believe that in all material respects:

  • The CR indicators outlined in the scope and subject matter section and published on Sonova’s website(1) marked with (×) PwC CH are not stated in accordance with Sonova Group internal policies and procedures; and
  • The management of reporting processes with respect to the CR Report and the preparation of CR indicators as well as the related control environment in relation to data aggregation of these key performance indicators are not functioning as designed.

PricewaterhouseCoopers AG

Stephan Hirschi

Raphael Rutishauser

Zurich, 14 May, 2021

  1. The maintenance and integrity of Sonova’s website is the responsibility of the Board of Directors; the work carried out by us does not involve consideration of these matters and, accordingly, we accept no responsibility for any changes that may have occurred to the CR indicators or reporting criteria when presented on Sonova’s website.
Dieser Abschnitt ist nur in englischer Sprache verfügbar.