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Management

Dr. oec. Sonja Sidler

Certified Tax Expert
Managing Partner
Phone +41 44 210 30 00

Career Summary

Dr. oec. Sonja Sidler is founder and Managing Partner of Alva Tax and Finance AG.


Sonja Sidler is a Certified Tax Expert with over 15 years experience in tax planning and financial consulting services. She began her career in the Swiss banking industry where she gained broad experience in corporate finance and private equity, and was Head of Tax and Finance at a quoted, multinational company in the manufacturing industry. Prior to establishing Alva Tax and Finance AG in June 2009, Sonja Sidler was an international tax partner at Deloitte, Zurich.


Sonja Sidler has significant experience in the area of mergers & acquisitions, business succession planning, international finance and treasury structures, international reorganisations, financial restructuring, optimisation of group structures, Swiss domestic and international corporate tax planning and EU tax law.


Sonja Sidler has served a multitude of local and global corporations across a range of industries and internationally based individuals.

Academic Background and Memberships

  • Master of Business Administration and PhD in Finance of University of Zurich
  • Swiss Certified Tax Expert
  • Part time lecturer at University of Lucerne for advanced studies
  • Member of the Chamber of Trust, the official network of Swiss Certified Accountants and Tax Consultants.
  • Member of IFA International Fiscal Association