About Me

I am a leading lawyer in tax litigation and tax controversy in Belgium and a teaching professor (tax litigation) at two Belgian universities. I also have complementary experience in other areas of tax law such as restructurings, tax planning for companies, due diligences, advance tax rulings, local taxes, stock option plans, international employment.

Specialising in tax from day one, my aim is to make the matter clear and understandable for the clients, then to indicate the possible savings, the recommended actions and the risks attached, if any. Our clients must be in a position to take a decision based on our opinion, which should be easily understandable. Case law and legal scholars' opinions are the foundation of the advice at a given time.

In litigation, the client must be defended firmly, but the way the arguments are put forward should leave the door open for a negotiated solution. My experience shows that disputes may be terminated at the administrative level of litigation with satisfactory results for both parties.

In court, my aim is to present short, structured written pleadings. Afterwards, the judge simply should be convinced that it is easier and simpler to find for the taxpayer. Pleading is an essential element of judicial tax litigation, and debates are nothing more or less than a first opportunity to convince the Court. It should be prepared with the same care as the written submissions and the lawyer must be able to answer all of the judge's questions.


  • 1989 - Licencié en droit (Master), Université Libre de Bruxelles, grande distinction (magna cum laude).
  • 1991 - Gegradueerde in de Fiscale Wetenschappen, Fiscale Hogeschool (Brussels), 'Met onderscheiding' (Postgraduate in tax law – cum laude)
  • 1993 - Master of Laws, Cambridge University (UK), 2.1


  • Brussels French-speaking bar, 1990
Testimonials Carousel Megaphone


"Olivier Bertin stands out in litigation"

Legal 500

Latest insights

More Insights

Belgium reduces tax benefits for companies under receivership, but extend them to private receivership schemes

Jun 11 2024

Read More

Tax returns deadlines: summary table of deadlines applicable as from the 2024 assessment year

May 17 2024

Read More

The Court of Appeal upholds the tax-neutral restructuring loss relief scheme

Jan 23 2024

Read More

What's on TwoBirds TV?

More Videos