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Attorneys and Tax Advisors
Karl Sommer
Attorney; Swiss Certified Tax Expert

Karl Sommer is principally active in the areas of tax, company and inheritance law. After years of work at the tax authorities, today he advises private individuals as well as small to medium-sized companies on tax law, whether in tax proceedings or concerning tax structuring.

He acts as counsel to private persons in inheritance issues such as the drawing up of wills and testaments. As a representative of heirs and executor of wills, he transacts inheritances and inheritance disputes. In addition, he serves as a substitute judge for the canton of Zurich.


2017Founding partner at KSF AG
2006Partner at the law firm Künzli Kaufmann & Partner
(beginning September 2016 Kanzlei Künzli & Partner)
1999Law firm Luther, Künzli Kaufmann
1998Swiss Certified Tax Expert
1994Cantonal Tax Office Zurich
1992Admission to the Bar
1987University of Zurich (lic. iur.)


German, English


All Swiss courts of law

Professional groups

Private individuals

Legal and litigative representation before tax authorities and courts

Inheritance law and estate planning

Company law

Child and adult protection law (KESB)

Financial intermediary SRO


+41 (0) 44 254 60 60

F +41 (0) 44 254 60 61


Künzli Sommer Frey AG

Mühlebachstrasse 20

CH-8008 Zürich