Who We Are

Our clients include entrepreneurs, companies of all legal forms and from all industries, as well as private individuals—we advise them on all tax-related questions.

International tax law is one of our main areas of expertise. For companies and entrepreneurs, the increasing globalization of their business activities poses special tax challenges. We offer them competent advice on cross-border issues aimed at optimizing taxation and avoiding double taxation by several states.

Tax consultancy services for German and international real estate investments (especially in the USA) are a further focus. We specialize in closed-end funds and can look back on several decades of successful experience in this field.

Our long-standing relationship with the German tax authorities and our extensive network of tax advisors, auditors, and lawyers in Germany and abroad enables us to offer our clients a very broad range of services.


Dieter Niehaves, PhD

Holder of a Master’s degree in Business Administration from the universities of Siegen and Hamburg, Dieter is a publicly appointed certified tax advisor (1998) and was awarded the academic degree of “Master of International Taxation” in 2002. He followed this with a PhD in International Taxation of Agency Permanent Establishments in 2009.

Before joining Hansa-Atlantic in 2016, Dieter had had years of experience working for international accounting firms, where he dealt with the tax affairs of companies and partnerships. Dieter has a keen interest in international tax issues. His main areas of activity are:

Dipl.-Kfm. Harald Reps

Holder of a Master’s degree in Business Administration from the University of Hamburg, Harald is a publicly appointed certified tax advisor.

From 1973 to 1978, Harald was a tax accountant with Arthur Young & Co., the German partner of Arthur Young, CPA, USA. He was responsible for auditing the financial statements of German companies pursuant to German and U.S. law (GAAP, GAAS, 10-K). In 1978, he moved to Lehndorff-Vermoegensverwaltung, Hamburg, and worked as a tax accountant there until 1979.

In 1980, Harald set up Hansa-Atlantic Steuerberatungsgesellschaft m.b.H.

Cross-border taxation between Germany, the USA and Canada is Harald’s specialist field. Since 1978, his consulting activities have focused on the design of real estate investments as well as providing tax planning and administration services to German individual and institutional investors.


Hansa-Atlantic GmbH & Co. KG
Habichthorst 34-36
22459 Hamburg

Phone +49 (0) 40 577 096-0
Fax +49 (0) 40 55 258 91
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