For you in Mainz for over 30 years

Our work respects traditions but is not limited by them, because:

“Change is the law of life. And those who look only to the past or the present are certain to miss the future." (John F. Kennedy)

Our company has continued to develop organizationally, personally, and professionally. Thanks to teamwork characterized by mutual trust, our client base has grown organically. In addition, several acquisitions have fueled the growth of our company.


Founding of the tax consulting firm by Mr. Werner Renkes as an individual practice


Conversion of the firm into a partnership with two other professional colleagues


Foundation of CONCEPT Renkes & Partner mbB as a tax consulting company (initially in the legal form of a GmbH, later conversion into a partnership)
Recognition of the company as an auditing company by the Chamber of Auditors.


After graduating in business administration (FH), Volker Hummel begins his professional activity at our company. After passing his professional examination, he is appointed a tax advisor and auditor.


Relocation from Frauenlobstraße to Mombacher Straße 93 in Mainz.


Mr. Joachim Wittlich, auditor and tax advisor becomes a partner of the company.


Volker Hummel is accepted into the partner group.

"Thanks to the cooperation characterized by mutual trust, the client base has grown organically. Furthermore, several acquisitions of law firms have promoted the growth of our company."




Relocation of the law firm from Mombacher Straße to our current office building Am Sägewerk 13 in Mainz-Gonsenheim Bettina Harms, tax consultant, joins our company.


Our founding partner Werner Renkes leaves the company as a partner and has been working "of counsel" ever since.


Bettina Harms is accepted into the partner group.

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