Trewitax

Our promise

This is Trewitax

Trewitax - that stands for trust, auditing and tax consulting. Our alliance of legally independent and economically independent companies combines knowledge, quality and motivation. Whether in Switzerland, Germany, Austria or South Tyrol - Trewitax provides sustainable advice at partner level.

This is Trewitax
Trewitax

What can we do for you?

Our services

Trust & Accounting

Trust & Accounting

With a professional accounting system, you control your company's success.
Auditing

Auditing

We see ourselves not only as legal auditors, but also as your partner.
Tax consultancy

Tax consultancy

From simple tax returns to sophisticated tax planning.
Business consulting

Business consulting

Trewitax accompanies you from strategy development to practical implementation.
Cross-border consulting D-A-CH-S

Cross-border consulting D-A-CH-S

Locally anchored and active across borders for 15 years.
Succession & Restructuring

Succession & Restructuring

Recognition of the financial situation as well as assistance in the purchase or sale of the company.
Trust & Accounting

Trust & Accounting

With a professional accounting system, you control your company's success.
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Auditing

Auditing

We see ourselves not only as legal auditors, but also as your partner.
Read more
Tax consultancy

Tax consultancy

From simple tax returns to sophisticated tax planning.
Read more
Business consulting

Business consulting

Trewitax accompanies you from strategy development to practical implementation.
Read more
Cross-border consulting D-A-CH-S

Cross-border consulting D-A-CH-S

Locally anchored and active across borders for 15 years.
Read more
Succession & Restructuring

Succession & Restructuring

Recognition of the financial situation as well as assistance in the purchase or sale of the company.
Read more
Trewitax

We are there for you at six locations

Our teams

We are there for you with our approximately 130 employees in the entire D-A-CH-S region. Find your contact persons from our locations here.

Singen

Dipl. Wirt.-Ing. Martin Klumpp
Dipl. Wirt.-Ing. Martin Klumpp
Certified Public Accountant / Tax Consultant / Managing Director / Partner / Team Leader
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Dipl. Wirt.-Ing. Frank Riedel
Dipl. Wirt.-Ing. Frank Riedel
Certified Public Accountant / Tax Consultant / Specialist Consultant for International Tax Law / Managing Director / Partner / Team Leader
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Dr. Olesja Dittmann
Dr. Olesja Dittmann
Certified Public Accountant / Tax Advisor / Specialist Advisor for International Tax Law / Managing Director / Partner / Team Leader
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Ansgar Woltemate
Ansgar Woltemate
Certified Public Accountant / Tax Consultant / Managing Director / Partner / Team Leader
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Julia Woltemate
Julia Woltemate
Certified public accountant / tax consultant / authorized signatory
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Antje Deichmeier
Antje Deichmeier
Tax consultant / authorized signatory / team leader
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Stefan Mayer
Stefan Mayer
Tax consultant / authorized signatory / branch manager Constance
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Tatjana Golowatisch
Tatjana Golowatisch
Tax consultant
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Julian Rottach
Julian Rottach
Lawyer
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Petra Baumann
Petra Baumann
Attorney at Law
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Joanna Nocon
Joanna Nocon
Tax assistant / Wage and salary specialist / Team leader
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Melina Heiser
Melina Heiser
Office Manager / Bachelor of Arts / Data Protection Officer / Team Leader
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Waltraud Augustyniak
Waltraud Augustyniak
Business economist VWA
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Christine Krug
Christine Krug
Tax specialist
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Lukas Terbeck
Lukas Terbeck
Assistant tax consultant / wage and salary specialist
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Daniel Tessendorf
Daniel Tessendorf
Assistant in tax consultancy and auditing / Business economist GA
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Lea Eggers
Lea Eggers
Assistentin in der Steuerberatung und Wirtschaftsprüfung / Bachelor of Laws – Wirtschafts- und Steuerrecht / Stud. Master of Arts – Taxation
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Michael Langer
Michael Langer
Assistent in der Steuerberatung und Wirtschaftsprüfung / Bachelor of Arts – BWL Schwerpunkt Finanzen
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Antonio Celano
Antonio Celano
Assistant tax consultant / Stud. Bachelor of Arts - Taxes and Auditing
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Alexander Kaziuberda
Alexander Kaziuberda
Assistent in der Steuerberatung und Wirtschaftsprüfung / Bachelor of Science - Wirtschaftswissenschaften
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Luisa Pankraz
Luisa Pankraz
Assistant tax consultant
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Melissa Maier
Melissa Maier
Trainee tax clerk
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Anna Gette
Anna Gette
Trainee tax clerk
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Martina Osswald
Martina Osswald
Accountant
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David Perez
David Perez
Personnel and organization consultant
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Nelli Fritsch
Nelli Fritsch
Lohnbuchhalterin
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Moira Vodopivec
Moira Vodopivec
Assistentin in der Lohnbuchhaltung
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Anja Ehinger
Anja Ehinger
Office Manager
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Chantal Buhl
Chantal Buhl
Office Manager
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Katharina Dietrich
Katharina Dietrich
Office Manager
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Stefanie Dering
Stefanie Dering
Office Manager
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Brigitte Brütsch
Brigitte Brütsch
HR-Managerin
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Moritz Hirling
Moritz Hirling
Stud. Bachelor of Arts - Business Informatics
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Tim Heine
Tim Heine
Stud. Bachelor of Arts - Business Informatics
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Lena Hauke
Lena Hauke
Stud. Bachelor of Arts - Taxation and Auditing
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Tijana Vasiljevic
Tijana Vasiljevic
Stud. Bachelor of Arts – Digital Businessmanagement
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Cajetan Weber
Cajetan Weber
Stud. Master of Science - Business Administration
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Isabelle Soremski
Isabelle Soremski
Stud. Bachelor of Law – Wirtschaftsrecht
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Nadezda Frank
Nadezda Frank
Trainee tax clerk
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Lina Kanwischer
Lina Kanwischer
Trainee tax clerk
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Lina Klumpp
Lina Klumpp
Auszubildende zur Steuerfachangestellten
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Jacqueline Orth
Jacqueline Orth
Assistant in tax consulting and auditing, Bachelor of Law - Business Law
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Stella Luengen
Stella Luengen
Assistant in tax consulting and auditing
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Clara Leone
Clara Leone
Trainee tax clerk
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Tanja Riede
Tanja Riede
Payroll and financial accountant
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Jonas Specker
Jonas Specker
Assistant in Tax Consulting and Auditing / Bachelor of Arts - Taxation and Auditing
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Kreuzlingen

 Stefan Zürcher
Stefan Zürcher
Partner
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Andreas Schwarzenbach
Andreas Schwarzenbach
Partner
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Pascal Debrunner
Pascal Debrunner
Partner
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Bianca Dobler
Bianca Dobler
Fiduciary
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Christa Paffrath
Christa Paffrath
Fiduciary
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Sonja Schlauer
Sonja Schlauer
Fiduciary
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Yannik Monti
Yannik Monti
Fiduciary
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Flavio Bucca
Flavio Bucca
Trainee
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Juliette Campana
Juliette Campana
Clerk
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Noah Dudler
Noah Dudler
Clerk
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Barbara Fischli
Barbara Fischli
Clerk
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Claudia Nigg
Claudia Nigg
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Karin Füchter
Karin Füchter
Clerk
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Verena Oberhänsli
Verena Oberhänsli
Office Manager
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St. Gallen

Franz Broger
Franz Broger
Partner
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Hermann Rothauer
Hermann Rothauer
Partner
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Herbert Fuchs
Herbert Fuchs
Mandate Manager
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Prisca Fässler
Prisca Fässler
Head of Mandate
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Yvonne Leutenegger
Yvonne Leutenegger
Trust Officer
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Daniel Broger
Daniel Broger
Clerk
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Hansjörg Etter
Hansjörg Etter
Fiduciary officer
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Ankica Zagradanin
Ankica Zagradanin
Fiduciary clerk
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Nadine Federer
Nadine Federer
Clerk
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Esther Di Benedetto
Esther Di Benedetto
Secretariat
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Zurich

Roman Alder
Roman Alder
Fiduciary with federal certificate of competence
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Angela Serratore
Angela Serratore
Secretarial staff
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Annegret Buol
Annegret Buol
Fiduciary with federal certificate of proficiency
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Roger Deutsch
Roger Deutsch
Partner, Certified Public Accountant
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Sandro Di Domenico
Sandro Di Domenico
Partner, Certified Public Accountant
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Bruno Faoro
Bruno Faoro
Partner, Certified Public Accountant
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Anja Fischer
Anja Fischer
Secretarial staff
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Tereza Fischer
Tereza Fischer
Fiduciary with federal certificate of competence
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Antje Holzbecher-Engler
Antje Holzbecher-Engler
Office Manager
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Claudia Preisig
Claudia Preisig
Fiduciary with federal certificate of proficiency
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Sabrina Soltermann
Sabrina Soltermann
Fiduciary in training
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Trewitax

News from the world of Trewitax

News and Publications

EXPERT INFO 3/2023
  • Neues Aktienrecht: Verlustverrechnung
  • AHV-Reform 2024
  • Bewertung von personenbezogenen Unternehmen
  • Digitale Signatur
pdf (1.9 MB)
Key figures 2024
pdf (129 KB)
EXPERT INFO 2/2023
  • Erhöhung der MWST-Sätze per 1. Januar 2024
  • Doppelbesteuerungsabkommen Schweiz–Frankreich: Besteuerung bei Homeoffice 
  • Bereit für das neue Datenschutzrecht?
  • Rechtsprechung Ferienanteil im laufenden Lohn
pdf (1.9 MB)
Checkliste Steuererklärung (Zürich)

Belege zusammenstellen leicht gemacht: Ausdrucken, Belege zusammensuchen und einschicken oder elektronisch ausfüllen und zusammen mit den digitalen Belegen sicher per Datenupload hochladen.

pdf (105 KB)
Key figures 2023
pdf (129 KB)
Personnel master sheet

with additional data of employees liable to withholding tax and registration for family allowances

pdf (180 KB)
Trewitax

Open positions

Current job offers and apprenticeships

We offer a variety of development opportunities and career prospects that will help you advance individually. Are you passionate about what you do and enjoy developing customized solutions for our clients? Then you've come to the right place!
Trewitax

Open positions

Current job offers and apprenticeships

We offer a variety of development opportunities and career prospects that will help you advance individually. Are you passionate about what you do and enjoy developing customized solutions for our clients? Then you've come to the right place!

Subscribe to the newsletter and secure your knowledge advantage.

Your Contact Person

Dipl. Wirt.-Ing. Martin Klumpp

Certified Public Accountant / Tax Consultant / Managing Director / Partner / Team Leader