Outstanding expertise

Your partner for corporate tax law

Over 120 years of experience

4 partners – 120 years of professional experience – 200,000 consultancy hours

We are member of the

BERLINTAX, the tax consultancy firm in the heart of Berlin: From foundation to succession, we support companies of all legal forms in tax and business matters – from sole proprietorships to listed stock corporations. The entrepreneurial growth and economic stability of our clients are important to us.

We stand for reliability in the preparation of payroll and financial accounting, profit determination and tax filing and offer competent help with restructuring and insolvency.

This is why we have been awarded the “Best Tax Advisor” seal.

Digital processes

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Everyone is talking about digitisation. So do we, of course, but differently. We first identify any corporate processes that can really be made more efficient, faster and better through digitisation. After all, digital processes are not an end in themselves, but must bring a clear advantage for you as a client. Ultimately, not every complex process can be fully automated. With our experience, we set you on the right path.

Real estate and taxes

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The majority of our clients come from the real estate industry. We have been advising market stakeholders along the entire value chain from architects to apartment building managers for over 40 years. Our clients, who have placed their trust in us for years and generations, also include a considerable number of family businesses with extensive real estate assets. Based on extensive industry knowledge and a solid expertise, we offer you tailor-made advice and the consistent implementation of your goals for sustainable tax optimisation. Control your success!

Transaction and structuring

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Anyone dealing with transactions, restructurings and reorganizations without tax advice is almost certain to fail. It is thus highly advisable to involve us in your business plans and goals at an early stage. We accompany you - and your family is so desired - as an entrepreneur with the tax optimisation of the acquisition structure, tax due diligence, with measures of the conversion and conversion tax law, as well as corporate and asset succession. Control your success!

Corporate tax law

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We are here for you. At any time. Together, we go further beyond traditional tax consultancy services. We make of your case our own business, creating proven added value for you with our strategic consultancy services, our network, and smart design advice. We understand companies because we are entrepreneurs ourselves. Control your success!

Your tax experts

Hans-Wolfram Dunckel

Markus Frank

Oliver Hagen

Kerstin Menz

Hans-Wolfram Dunckel


+49 30 809711 - 0

Hans-Wolfram Dunckel knows how business works - in theory and in practice. During his apprenticeship as a chemist in the 1980s, Hans-Wolfram Dunckel - who was born in Berlin-Spandau - also studied business administration at the Free University of Berlin, with a focus on tax law and auditing. After completing his studies, the business graduate applied and expanded his knowledge at a medium-sized auditing firm, where he specialised in advising and auditing non-profit companies and real estate funds.

To round off his knowledge, he passed the tax advisor exam in 1989. After being appointed tax advisor, he moved to Berlintax (at that time still Schnoeckel und Partner Steuerberatungsgesellschaft). A year later, he was appointed partner at the law firm and became a mainstay of the company. He developed the real estate fund division in the law firm for many years, and brings his extensive practical knowledge of real estate and partnership taxation to his clients' advice.

Markus Frank


+49 30 809711 - 0


Markus Frank is a highly trained jurist and has been working as a lawyer primarily for entrepreneurs for over 20 years. He has been a specialist lawyer for tax law since 2003 and a specialist lawyer for commercial and corporate law since 2007. Markus Frank's particular strength lies in corporate and asset succession, corporate acquisitions and strategic advice to medium-sized companies.

Markus Frank has also been a certified supervisory board member (SHB) since 2017. For many years, he has been sharing this experience with a large number of (family) companies as chairman of advisory and supervisory boards.

Career: Markus Frank, born in Bremen in 1965, came to Berlin to study and do his legal clerkship. During that time, he was a research assistant to lawyer Prof. Dr. Benno Heussen. In 1999, he founded the law firm Gentz und Partner Rechtsanwälte, Steuerberater, Notare. Since 2019, he has also been the managing partner of Berlintax.

Oliver Hagen


+49 30 809711 - 0


Oliver Hagen is a passionate tax advisor - and has been so for over 20 years. After training in the financial administration of Lower Saxony, Oliver Hagen initially worked for several years at the regional finance office in Hanover. He then moved to the Federal Ministry of Finance (BMF - Bonn / Berlin). At the Ministry, he acquired a broad knowledge of tax law across all types of tax in the economic policy department.

After passing his tax advisor exam in 2002, he decided to work in the private sector. Since then, Oliver Hagen has worked as a tax advisor to companies and private individuals in all tax and accounting law matters. His clients include small to medium-sized companies in the service sector, as well as manufacturers with a total of several thousand employees, companies in the public sector, hospital companies, welfare associations and much more.

Furthermore, Oliver Hagen advises companies of all sizes across Germany on wage tax law, and boasts ample experience in the sustainable and strategic alignment of remuneration models.

Kerstin Menz


+49 30 809711 - 0

Kerstin Menz is a tax advisor through and through. She completed her apprenticeship as a tax assistant in the first tax consultancy firm that had established itself on the island of Rügen after the fall of the Wall. Following her practical training, Kerstin Menz studied business administration with a focus on business taxation and auditing at the Free University of Berlin, and graduated in 1998 with a degree in business administration.

After working for a tax consultancy firm in the north of Berlin for a number of years and working as an independent management consultant, Kerstin Menz moved to Gentz und Partner, and passed the tax consultant exam in 2009. For many years, she was a partner at the law firm with which she is still strategically and socially connected. Kerstin Menz has been a partner and managing director at Berlintax since 2020, and sets new quality standards in company accounting and tax advice.

We thank you for the years of extremely competent, professional, reliable, and friendly cooperation in the area of financial accounting, preparation of annual financial statements, and tax filing. The BERLINTAX team always has an open ear and questions are always answered competently and comprehensibly. Thank you for that. We can recommend BERLINTAX unreservedly!

Barbara Lewetzki, CEO
Hauselfen GmbH

Committed, reliable, fast. Berlintax depicts economic realities in a comprehensible and appropriate manner.

Sascha Rybarczyk, General Manager
botspot GmbH

As an entrepreneur and managing director, it is important to me to be accompanied in tax matters by a partner who thinks entrepreneurially himself. Berlintax meets all my needs: from accounting issues within my company to complex tax advice that cleverly combines my companies and business areas in a tax-optimised manner. For me, an ideal match of operational tax skills and clever, entrepreneurial advice!

Vian Feldhusen, CEO
Vian Ventures GmbH

Current client information

Read our current client information here (currently only available in German). Available online quickly and at any time. You also have the option of accessing the client information from the previous months.