Stefan Winheller, Partner, German Attorney at Law, LL.M. Tax (GGU, CA, USA), Certified Specialist for Tax Law

Stefan Winheller

Partner, German Attorney at Law, LL.M. Tax (GGU, CA, USA), Certified Specialist for Tax Law

Stefan Winheller, Partner, German Attorney at Law, LL.M. Tax (GGU, CA, USA), Certified Specialist for Tax Law

German, English

For more than 20 years, Attorney Stefan Winheller has been specializing in tax law. He advises and represents charitable and non-charitable foundations as well as other nonprofit organizations. He supports wealthy private individuals in Germany and abroad, companies and the public sector in the establishment of foundations, asset structuring and business succession planning.

In addition, he supports companies and entrepreneurs, especially those with blockchain-based business models and/or substantial crypto assets, in establishing a tax-optimized asset and business structure (foundation models, foundation holdings, GmbH holdings, asset protection) and in international tax law regarding questions on international tax structuring and optimization - often also in an international, cross-border context.

A further focus of his work is advising domestic and foreign entrepreneurs and crypto investors on the supplementary declaration of income for tax purposes as part of a voluntary disclosure exempting them from prosecution. Thanks to his many years of experience in international tax law and crypto tax law, Stefan Winheller and his team prepare effective supplementary declarations and thus pave the way back to tax honesty and impunity for his clients.

Stefan Winheller is regularly publishing articles in specialist books and magazines on his areas of expertise. He is the initiator and co-editor of the first commentary on nonprofit law published by the renowned German legal publishing house Nomos. Furthermore, he worked as a lecturer and speaker, e.g. for the Abbe Institute for Foundation Studies at the University in Jena and the University of Münster for the master's degree in “Nonprofit Management and Governance”.

Stefan Winheller studied law at the Universities of Heidelberg, Bielefeld, Speyer and Cologne, specializing in tax law. After being admitted to the bar, he completed postgraduate studies in U.S. tax law at the Golden Gate University, San Francisco (USA). He used his time abroad in the USA to intensively study the taxation of nonprofit organizations and foundations under U.S. law as well as the special features of international tax law.

Since he began working as an attorney, Stefan Winheller has regularly written articles in specialist books and journals on his areas of specialization. He is the initiator and co-editor of the first comprehensive commentary on nonprofit law published by Nomos-Verlag. He has also worked as a lecturer for the Abbe Institute for Foundations at the Friedrich Schiller University in Jena and for the Westfälische Wilhelms University in Münster for the Master's program "Nonprofit Management and Governance". 

Stefan Winheller is a business angel and early investor for startup companies, especially in the tech sector. For more than seven years, he has been CEO of the American nonprofit organization American Friends of Germany, Inc., which supported German nonprofit organizations in their fundraising activities in the USA until the end of 2012.

As founder and managing partner of WINHELLER, Stefan Winheller is in charge of the strategic direction and development of the law firm. He is married and has three children.

Associations and Volunteering

  • German-American Lawyers' Association (task force “Law of Taxation”)
  • German Bar Association
  • Tax Law Group of the German Lawyers' Association
  • Institute of Tax Advisers in Hessen, Germany
  • Legal committee of the German Fundraising Federation


  • German crypto investor with almost 500 million euros in assets
    Specialist advice on criminal tax law, supplementary declarations, international tax law
  • Family foundation with company participation
    Legal and tax advice to the founder and the board of the family foundation with regard to amendments to the articles of association and the sale of a shareholding worth approx. 100 million euros
  • NFT investor with double-digit million profits
    Comprehensive advice on income tax and other tax issues as well as asset structuring (holding etc.)
  • Bundesministerium für Bildung und Forschung (BMBF)
    Legal backing of the BMBF in the establishment of various German Health Research Centres (DZG) and the German Cancer Consortium (DKTK)
  • Caritasverband Frankfurt e.V.
    Ongoing advice and expert valuation on the association's articles as well as nonprofit issues
  • FC Gelsenkirchen Schalke 04 e.V.
    Legal advice on various issues concerning the law of associations and nonprofit law
  • Fraunhofer-Institut für Zelltherapie und Immunologie
    Nonprofit law advice related to various research facilities
  • Hubert Burda Stiftung
    Comprehensive revisions of the statute, agreements regarding forwarding of funds, staff contracts
  • Islamic Relief Worldwide (UK) und Islamic Relief – Humanitäre Organisation in Deutschland e.V
    Consultancy relating to comprehensive corporate restructuring of the globally operating Islamic relief organizations
  • Landesstiftung "Miteinander in Hessen"
    Ongoing tax advice and drafting of contracts regarding refugee aid projects
  • Steuerberaterverband Hessen e.V.
    Tax and legal advice on issues of legal structure and brand licensing problems


  • Corporate Tax Germany, Stefan Winheller, in: Foreign Tax and Trade Briefs, Lexis Nexis
  • Individual Income Tax, Stefan Winheller (Co-Autor), in: Foreign Tax and Trade Briefs, Lexis Nexis

full list of publications

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