With competence and commitment
at your side

Anna Gette

Trainee tax clerk

Ansgar Woltemate

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

Ansgar Woltemate is a partner and managing director of Trewitax Deutschland GmbH and continues to work as an auditor and tax consultant. Since 2013, he has been supporting our clients in the main areas of ongoing tax and business consulting (esp. of corporations), auditing and M&A projects.

His further areas of expertise are tax advice to employees in cross-border matters (in particular to Switzerland) and the support of clients with project company structures (e.g. property developers).

Antje Deichmeier

Tax consultant / authorized signatory / team leader

As a tax consultant and authorized signatory, Antje Deichmeier supports our clients in the main areas of preparing annual financial statements and tax returns, international employee taxation, optimizing financial accounting and ongoing tax consulting.

Her other areas of expertise include the preparation of insolvency accounts and tax advice to insolvency clients.

Antonio Celano

Assistant tax consultant / Stud. Bachelor of Arts - Taxes and Auditing

Cajetan Weber

Stud. Master of Science - Business Administration

Cajetan Weber is studying business administration in the master's program at the renowned Ludwig Maximilian University in Munich. For several years, he has been working for Trewitax as a student trainee in the field of annual audits and has been involved in project-related work, e.g. in structuring and succession consulting.

Other focal points of his work include company valuations, IT-related problems and supporting our clients in fulfilling their reporting obligations to the Transparency Register resulting from the Money Laundering Act.

Chantal Buhl

Office Manager

Clara Leone

Trainee tax clerk

Daniel Tessendorf

Assistant in tax consultancy and auditing / Business economist GA

Dipl. Wirt.-Ing. Frank Riedel

Certified Public Accountant / Tax Consultant / Specialist Consultant for International Tax Law / Managing Director / Partner / Team Leader

Frank Riedel is a partner and managing director of Trewitax Deutschland GmbH and has been with the company since 2003. Prior to that, he worked as a manager of an international auditing and tax consulting firm. As an experienced auditor, tax advisor and specialist consultant for international tax law, he supports our clients in the areas of international tax consulting, tax structure and structuring consulting, voluntary and legally required audits, international accounting and group accounting.

Joanna Nocon

Tax assistant / Wage and salary specialist / Team leader

Joanna Nocon has been working for Trewitax GmbH since 2013 as a tax clerk and payroll assistant. As team leader, she is responsible for the payroll department and her areas of expertise include consulting, optimization and preparation of payrolls. She supports our international clients in the registration and payment of German social security and payroll taxes.

As an experienced tax specialist, Joanna Nocon assists our clients in setting up, digitizing as well as optimizing their financial accounting.

Jonas Specker

Assistant in Tax Consulting and Auditing / Bachelor of Arts - Taxation and Auditing

Julian Rottach

Lawyer

Julian Rottach joined Trewitax GmbH as a lawyer after studying law with a focus on commercial criminal law. He is a graduate of a specialist course in tax law and advises our clients on the interface between law and taxes.

His consulting focus is on corporate and private succession planning. In addition, he regularly assists our clients in connection with the formation, restructuring and liquidation of partnerships and corporations.

As in-house lawyer of Trewitax GmbH, Julian Rottach also represents the legal interests of the company and advises management and colleagues on legal issues.

Katharina Dietrich

Office Manager

Katharina Dietrich is a trained businesswoman for tourism and leisure. After 13 years, she made a change in industry and has been working as Office Manager for Trewitax GmbH in Singen since April 2021.

The day-to-day, smooth management of the office and client care are among her responsibilities.

Lena Hauke

Stud. Bachelor of Arts - Taxation and Auditing

Lina Kanwischer

Trainee tax clerk

Luisa Pankraz

Assistant tax consultant

Lukas Terbeck

Assistant tax consultant / wage and salary specialist

As a tax clerk and specialist assistant for wages and salaries, Lukas Terbeck has been supporting our clients in the preparation of financial accounting, payroll accounting, annual financial statements and tax returns since August 2019.

Dipl. Wirt.-Ing. Martin Klumpp

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

Martin Klumpp is a partner and managing director of Trewitax Deutschland GmbH and has been with the company since 1996. With many years of experience as an auditor and tax consultant, he serves our clients with his expert knowledge in the areas of international tax consulting, tax structure and structuring consulting, financial consulting, data protection and restructuring consulting. His further area of expertise is tax advice for insolvency mandates. Until 2018, Martin Klumpp was a lecturer at the Duale Hochschule BW Villingen-Schwenningen in the area of tax and business. He is also a regular speaker for DATEV in the area of digital law firms.

Melissa Maier

Trainee tax clerk

Nadezda Frank

Trainee tax clerk

Stefanie Dering

Office Manager

Stella Luengen

Assistant in tax consulting and auditing

Tanja Riede

Payroll and financial accountant

Tatjana Golowatisch

Tax consultant

Tatjana Golowatisch has been working for Trewitax GmbH as a tax consultant since April 2017. She supports our clients in the main areas of ongoing tax advice, in particular for corporations in national and cross-border matters, as well as in the preparation of annual financial statements and tax returns.

In addition, Julia Golowatisch advises our clients on international tax law and M&A projects. With the foreign languages Russian and English, she has comprehensive language skills for international tax consulting.

Tim Heine

Stud. Bachelor of Arts - Business Informatics

Waltraud Augustyniak

Business economist VWA

Dr. Olesja Dittmann

Certified Public Accountant / Tax Advisor / Specialist Advisor for International Tax Law / Managing Director / Partner / Team Leader

Dr. Olesja Dittmann is a partner and managing director of Trewitax Deutschland GmbH since 2019. She has been working for Trewitax as a tax consultant, auditor, specialist consultant for international tax law and authorized signatory since January 2014.

She serves our clients in the main areas of ongoing tax and business consulting, auditing, M & A and international tax consulting. With the foreign languages English, Russian and Spanish, she has comprehensive language skills for international tax consulting.

Her further area of expertise is tax advice on insolvency mandates.

Stefan Mayer

Tax consultant / authorized signatory / branch manager Constance

Stefan Mayer works for Trewitax as a tax consultant and authorized signatory. Since 2010, he has been supporting our clients in the main areas of ongoing tax and business consulting, the preparation of annual financial statements and tax returns.

He also serves as the audit manager for voluntary and statutory annual audits.

Julia Woltemate

Certified public accountant / tax consultant / authorized signatory

Julia Woltemate has been working for Trewitax Deutschland GmbH as an auditor and tax consultant since 2021. Prior to that, she worked as a manager at an international auditing and tax consulting firm in the Financial Services division.

As an experienced auditor and tax advisor, Julia Woltemate supports our clients in the main areas of international tax consulting, tax structure and structuring consulting as well as M&A.

She has extensive knowledge and many years of practical experience in group accounting, international financial reporting (IFRS) and annual auditing.

Melina Heiser

Office Manager / Bachelor of Arts / Data Protection Officer / Team Leader

Melina Heiser has been a part of the Trewitax team since 2016. She leads the office management and is responsible for the support of clients and internal processes. Since 2018 she is also still working as a data protection officer.

Petra Baumann

Attorney at Law

Martina Osswald

Accountant

Anja Ehinger

Office Manager

Moritz Hirling

Stud. Bachelor of Arts - Business Informatics

David Perez

Personnel and organization consultant

Jacqueline Orth

Assistant in tax consulting and auditing, Bachelor of Law - Business Law

Christine Krug

Tax specialist

Brigitte Brütsch

HR-Managerin

Michael Langer

Assistent in der Steuerberatung und Wirtschaftsprüfung / Bachelor of Arts – BWL Schwerpunkt Finanzen

Isabelle Soremski

Stud. Bachelor of Law – Wirtschaftsrecht

Isabelle Soremski studiert im Bachelorstudiengang Wirtschaftsrecht an der HTWG in Konstanz. Seit 2023 verstärkt sie das Team der Trewitax GmbH.

Als Werkstudentin unterstützt sie ihre Kolleginnen und Kollegen bei der Durchführung von Wirtschaftsprüfungen, der Erstellung verschiedener Steuererklärungen und anderen Projekten.

Lea Eggers

Assistentin in der Steuerberatung und Wirtschaftsprüfung / Master of Arts – Taxation / Bachelor of Laws – Wirtschafts- und Steuerrecht

Nach erfolgreichem Abschluss ihres dualen Studiums in Wirtschafts- und Steuerrecht beim Finanzamt im Februar 2022 ist Lea Eggers in die Steuerberatung gewechselt. Seit Juli 2023 unterstützt sie das Team der Trewitax bei der Erstellung von Jahresabschlüssen und Einkommensteuererklärungen. Des Weiteren wirkt Sie als Assistentin in der Steuerberatung und Wirtschaftsprüfung bei freiwilligen und gesetzlich vorgeschriebenen Jahresabschlussprüfungen mit. Von Oktober 2022 bis August 2024 absolvierte sie berufsbegleitend ihren Master of Arts in Taxation.

Lina Klumpp

Auszubildende zur Steuerfachangestellten

Nach dem Abschließen ihrer allgemeinen Hochschulreife hat Lina Klumpp im September 2023 ihre Ausbildung zur Steuerfachangestellten bei der Trewitax GmbH begonnen. In den ersten drei Monaten unterstützt sie das Office und danach durchläuft sie die weiteren Bereiche der Ausbildung zur Steuerfachangestellten.

Tijana Vasiljevic

Stud. Bachelor of Arts – Digital Businessmanagement

Tijana Vasiljevic ist seit September 2023 bei der Trewitax GmbH tätig. Gleichzeitig absolviert Sie ihr Studium zum Bachelor of Arts im Bereich "Digital Business Management" an der DHBW in Villingen-Schwenningen.

Alexander Kaziuberda

Assistent in der Steuerberatung und Wirtschaftsprüfung / Bachelor of Science - Wirtschaftswissenschaften

Moira Vodopivec

Assistentin in der Lohnbuchhaltung

Nelli Fritsch

Lohnbuchhalterin

Dennis Balemans

IT-Consultant

Nathalie Kubitz

Steuerfachangestellte

Barbara Fischli

Clerk

Andreas Schwarzenbach

Partner

Bianca Dobler

Fiduciary

Bianca Dobler joins the team of Trewitax Kreuzlingen AG in autumn 2019. She completed a fiduciary apprenticeship and then successfully trained as a specialist in finance and accounting with a federal certificate. She gained years of experience in various fiduciary companies, making her a competent contact person in all fiduciary matters.

Juliette Campana

Clerk

Karin Füchter

Clerk

Noah Dudler

Clerk

Pascal Debrunner

Partner

Pascal Debrunner has been working as an auditor at Trewitax Kreuzlingen AG since 2012. The qualified auditor and business economist FH previously worked for over six years as an auditor at PwC in Zurich and St. Gallen, where he worked at manager level in the areas of trade, industry and services. This experience makes him a competent contact for all questions concerning auditing, accounting and company valuation.

Sonja Schlauer

Fiduciary

Sonja Schlauer graduated from commercial high school with a vocational baccalaureate and then trained as a fiduciary with a federal certificate. Since 2007, she has been putting this profound knowledge into practice for the clients of Trewitax Kreuzlingen AG, in particular in the areas of general accounting, financial statement preparation and tax consulting.

Stefan Zürcher

Partner

Seven years of experience as a tax commissioner for legal entities at the Canton of Thurgau and many years of consulting experience in the border triangle of Lake Constance make Stefan Zürcher a proven expert in national and international tax consulting with a focus on restructuring and cross-border business transactions. The certified tax expert and certified expert in accounting and controlling has been a partner of Trewitax Kreuzlingen AG since 1999.

Verena Oberhänsli

Office Manager

Claudia Nigg

Yannik Monti

Fiduciary

Manuela Kettwig

Mandatsleiterin

Manuela Kettwig verstärkt seit Juni 2024 das Team der Trewitax Kreuzlingen AG. Sie konnte in ihrer langjährigen Tätigkeit als Steuerfachangestellte und Treuhänderin mit eidg. Fachausweis umfangreiche Erfahrungen in der Mandantenbetreuung in Deutschland und als Mandatsleiterin in der Schweiz sammeln. Die Ausbildung zur Treuhänderin mit eidg. Fachausweis hat sie 2012 erfolgreich abgeschlossen.

Françoise Schütz

Sachbearbeiterin

Françoise Schütz hat ihre Ausbildung zur Steuerfachangestellten in Deutschland erfolgreich abgeschlossen. Seit 2024 unterstützt sie das Team der Trewitax Kreuzlingen AG im Bereich der Besteuerung natürlicher Personen. Zusätzlich ist sie für das Besuchermanagement und die interne Organisation verantwortlich und trägt damit wesentlich zum reibungslosen Ablauf des Unternehmens bei.

Daniel Broger

Clerk

Franz Broger

Partner

Herbert Fuchs

Mandate Manager

Herbert Fuchs is a certified public accountant and accountant with a federal diploma. As a former insurance broker, head of administration and chief financial officer, Herbert Fuchs can look back on a wealth of experience from which the clients of Trewitax St. Gallen have also benefited since 2004.

Hermann Rothauer

Partner

Prisca Fässler

Head of Mandate

Esther Di Benedetto

Secretariat

Ankica Zagradanin

Fiduciary clerk

Nadine Federer

Clerk

Yvonne Leutenegger

Trust Officer

Hansjörg Etter

Fiduciary officer

Sandro Di Domenico

Partner, Certified Public Accountant

"In addition to my work as an auditor and tax consultant at Trewitax, I have been involved in the aid project "Pro Pomasqui" in Ecuador for over 25 years. People often ask me how this fits together. Just like consulting, development work requires a lot of commitment, passion and cooperation. Through my involvement with Pro Pomasqui, I recharge my batteries for my day-to-day work. The contrast couldn't be greater, but the mix of the two activities makes it varied and exciting."

Bruno Faoro

Partner, Certified Public Accountant

"I became a self-employed auditor because I am interested in the range of fiduciary services, auditing and taxes. Self-employment requires personal commitment and is compensated by proximity to clients. Self-employment requires a long-term focus and short term success is not my thing. I like to work and live solution-oriented and pragmatic, because with a perfect professional analysis alone, good advice is not done. I am the financial family doctor of my clients, who has the whole picture in mind and maintains a good exchange with my professional colleagues."

Roger Deutsch

Partner, Certified Public Accountant

"I became an auditor because in no other profession do you get so close to people and their needs at such a young age. Even after 25 years, looking after SME entrepreneurs is still a very varied job that always challenges and motivates me to develop good solutions for our clients with foresight. Being open and flexible to new things is a basic requirement to be able to cope well with the constant changes in our profession, because if you don't move with the times, you move with the times."

Annegret Buol

Fiduciary with federal certificate of proficiency

"Since my apprenticeship in Chur, I have remained loyal to fiduciary services - nomen est omen. The work offers a lot of variety every day, is diverse both in terms of tasks and clients, and challenges you again and again thanks to legal and technical changes. Even though the profession has remained the same, I have worked in different places. I moved from the mountains to the big city. Now, at Trewitax, I have once again found a real home for the last years of my career. With exciting tasks, open-minded "Gspänli" - and finally a genuine Grisonian as boss."

Anja Fischer

Secretarial staff

"I was able to gain my first work experience in the commercial sector at Trewitax Zurich. I liked it so much that I immediately longed for a change back - since then I have been working in the secretariat and supporting my colleagues in different areas. In my private life, too, I live a diverse life, travel Europe, explore nature with my Labrador dog Xanny, and always try to learn something new and develop myself further."

Tereza Fischer

Fiduciary with federal certificate of competence

"What attracts a PhD of film studies to turn her back on the colorful Cannes Film Festival, to visit the cinema only in her spare time, and to devote herself to numbers instead? The challenge of learning something new again - but above all the people. At Trewitax, I was very fortunate to be part of a well-coordinated, dedicated team that supported me on this path and that is made up of people who are full of life and experience. But it is also the clients who give me insights into new worlds and whom I, in turn, can support where their main competence does not lie. For me, the work as fiduciary is almost as versatile as the stories in the movies - but I'm much closer to them."

Antje Holzbecher-Engler

Office Manager

"Even before, people called me "Duracell" because I never got tired of dancing. Now it's not just the daily sport that keeps me going, but also the work, which I enjoy and where I never run out of steam. I had imagined the job of office manager to be rather boring, because my goal was accounting. I wouldn't have thought that this job title hides a varied job where I am the linchpin and motivator for everyone. I'm the mistress of creative chaos who has an eye for the essentials and pulls all the strings."

Claudia Preisig

Fiduciary with federal certificate of proficiency

"During my studies, I traveled half the world: from Turkmenistan, where you're only allowed to travel under strict guard, to wildlife-rich Kenya and deep into the Bolivian Amazon. I'm always drawn to the world, to explore the unknown and enjoy the freedom. Professionally, I've landed in the meantime. At Trewitax, I can live out my other passion: that for numbers. As a trustee and the person responsible for our complete digital software solution, I get to take responsibility and act independently. This is completely in line with my desire for autonomy, which I value not only when traveling."

Angela Serratore

Secretarial staff

"My Italian blood gets boiling when I see beautiful cars and tinker with my old Cinquecento. Football is another passion of mine. I used to kick a ball myself, now I'm just a big fan. What I love about soccer is the teamwork. That's important to me in my job, too, whether it used to be as a toddler educator trying to teach the little ones to treat each other fairly or as part of a well-coordinated team at Trewitax."

Sabrina Soltermann

Fiduciary in training

«An meiner letzten Stelle bin ich sozusagen gegen meinen Willen zur Buchhaltung gekommen, habe aber schnell Spass daran gefunden. Um mich herum ging es manchmal hektisch zu, denn spannende Fälle im Bereich des Geldwäschereigesetztes haben das Team beschäftigt. Mit meiner ruhigen Art habe ich stets Ruhe in den Betrieb gebracht. Es tönt vielleicht widersprüchlich, aber nach fünfzehn Jahren in meinem allerersten Job, suche ich im Treuhand eine neue Herausforderung und vor allem die Abwechslung.»

Igor Kojic

eidg. dipl. Experte in Rechnungslegung und Controlling

«Mich zieht es immer wieder in die Ferne. Vor allem im Winter geniesse ich die Wärme südlicher Länder. Aber ich komme auch immer gerne zurück: Mein Einstieg bei der Trewitax liegt schon ein Weilchen her. Von 2014 bis 2019 war ich Teil des Teams bei der Trewitax Kreuzlingen. Nach zwei eidgenössischen Fachausweisen, einem Diplom, vielen Reisen und Erfahrungen bei anderen Treuhandbüros bin ich zur Trewitax zurückgekehrt. Hier ist es vor allem die Beratung, die mir am Herzen liegt. Ich werde auch von hier aus wieder verreisen und vor allem auch weiterbildungstechnisch neue Herausforderungen suchen.»