About Me

I am an international tax lawyer with a passion for cross-border work and have been a partner here at Bird & Bird since 2014. Today, as head of our Dutch Tax practice, I'm based out of The Hague.

As a dual qualified tax lawyer with over 24 years' experience, I have built my practice around domestic and overseas clients, focusing on innovative companies. I specialise in international tax and advise European and US multinationals on cross-border transactions, corporate reorganisations and M&A. I also advise on the creation of European investment and private equity funds, real estate investment funds, financing, licensing and holding structures.

Before joining the team at Bird & Bird, I worked as an international tax lawyer in the Netherlands, Luxembourg and New York. Today I'm a frequent speaker on tax topics at seminars and conferences, and often act as a conference chairman.

I am a member of the Dutch Association of Tax Advisers (NOB), the International Fiscal Association, the Dutch Bar Association (NOvA) and the American Bar Association.


  • Universiteit Leiden, Master's degree, Notarial law
  • Universiteit van Amsterdam, Master's degree, Tax Law/Taxation


  • Dutch Bar (Amsterdam and The Hague), Netherlands, 2001
  • Association of Tax Advisers, Netherlands, 2000
  • New York State Bar, 2007
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We have dealt primarily with Willem Bongaerts. I trust Willem and he is my first call for doing business outside of the US. I trust that Willem has my back and has shown himself to be knowledgeable but also have access to resources in other countries and subject matter where he might not be an expert.

The Legal 500 EMEA, 2023

Willem Bongaerts is calm and offers very pondered analysis. Searching for a well-balanced solution. Quick response in urgent matters.

The Legal 500 EMEA, 2023

Clients report that Willem Bongaerts of Bird & Bird offers 'terrific knowledge of the law, with prompt turnaround and responsiveness.' Another client describes him as 'knowledgeable, down to earth and practical.' Bongaerts advises clients on advance tax rulings for the creation of Dutch investment platforms. He also assists clients with the tax aspects of corporate and financial transactions.

Chambers and Partners Europe, 2020

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