About us – welcome to ADB

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ADB stands for Altorfer Duss & Beilstein and is based in Zurich. It was founded as a partnership in 1954 and transformed into a corporation in 2005. ADB is one of the leading tax law firms in Switzerland.


Taxes – that’s our business. We are an independent tax law firm and offer national and international clients comprehensive consultancy focusing on Swiss and international tax law and bordering areas of Swiss business law. Our services are based on decades of professional experience and are characterised by recognised specialist expertise. Professional dialogue with the tax authorities provides the basis for optimal solid solutions.


The ADB team is composed of ten account leaders Marco Duss, Jürg Altorfer, Marco Greter, Urs Zeltner, Andreas Helbing, Fabian Duss, Britta Rehfisch, Mathias Häni, Pascal Taddei and Fabian Streule along with four other tax experts.


Due to our membership with Nexia International as well as our well established longtime contacts with foreign advisers, we are able to guarantee our customers a competent service in an international environment.


With our avocational roles as lecturers, specialist writers and judges, we each provide our own additional contribution to the development of tax law and ensure at all times that our know-how is up to date.