Skilled, personable, conscientious

About us

Ostschweizerische Treuhand Gesellschaft AG was founded in St. Gallen in 1918. After only a short time the economic significance of the Zurich region was recognised and a branch was opened in Zurich itself. This branch became legally independent in 1992.

As an accredited audit firm, we are authorised to conduct full and limited audits. Our core competences include services in the areas of finance, accountancy and auditing as well as corporate and tax consultancy.

We offer our clients a comprehensive service and support along with a personal business relationship. The excellent education and training as well as the many years’ experience of our specialists ensure that we can support you with well-grounded knowledge and first-class advice. When you deal with us you will find that your interests are looked after by the same person year in, year out.

Our membership of HLB International, a major network of similarly positioned professional accounting firms and business advisors in all the world’s most important countries, provides us with international support.

We would be happy if Ostschweizerische Treuhand Zürich AG could act on your behalf and we would be delighted to explain our services to you in a face-to-face conversation - with no obligation.

For The Strategy & Vision

Organisation and management

Executive Board:

Thomas N. Zehnder, LL.M, Swiss certified tax consultant, accredited audit expert
Reto Schmidhauser, Swiss certified accountant and accredited audit expert
Markus Harsch, Swiss certified fiduciary expert, accredited audit expert

Board of Directors:

Rolf Herter, M.C.J., Chairman
Thomas N. Zehnder, LL.M, Swiss certified tax consultant, Delegate
Reto Schmidhauser, Swiss certified accountant, Member

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