Welcome to Dyzak & Sistermanns

We are pleased to be able to give you a first impression of our office and the services we offer.

For more than 50 years now, we have been providing advice in tax matters to private persons, freelancers and companies of all sizes.

In the second generation since 1998, we have been offering our clients one-stop advice service in tax and legal matters. A team of qualified and long-standing dedicated colleagues supports us in this. Please arrange an appointment with us, so that we can also give you a personal impression, because:

Your confidence is the basis of our work.


  • Classical Services
  • Succession Planning
  • International tax laws

We provide professional advisory and consultancy services both in tax questions and regarding economic targets to private persons, freelancers and companies of all sizes and legal forms.
In this, we are cross-sectoral and work for all professional groups.

Management Consulting is becoming more and more important for every enterprise, so it is one of the activities we focus on.

Management Consulting should not start just then when an enterprise is already in a crisis but should accompany it with an eye to the future. In our understanding, the target of Management Consulting is to avoid a crisis.

Our work as lawyers is focused on economic efficiency.

Together with you, we weigh up the measures that are sensible in consideration of the costs risk. What good is it to you to win a lawsuit if the opponent is unable to pay?


Klaus Sistermanns

lawyer/tax consultant

Partner i.S.d. PartGG


  • Constitutive Tax Advisory Service
  • Commercial and Company Law
  • International Tax Law
  • Contract Law

Foreign languages: English, Dutch

Mira Dyzak-Sistermanns


Partner i.S.d. PartGG


  • Family Law
  • Law of Succession
  • Employment Law

Foreign languages: English, French

Brigitte Dyzak

tax consultant

Partner i.S.d. PartGG


  • Asset Formation
  • Old Age Provision
  • Advisory Service in Succession Planning

Foreign languages: English, French