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Auditing and tax consulting for medium-sized businesses

The requirements for conducting annual audits are becoming more stringent all the time. We adapt to this development and rise to the challenge.

Years of experience in conducting statutory and voluntary annual audits enable us to quickly familiarize ourselves with the individual situations and circumstances of your company and thus ensure a smooth and efficient audit process.

You would also like to manage your company in a financially conscious way?

We know the special needs of medium-sized and family-run companies. For your ideas and strategies, we develop individual solution concepts to exploit your tax opportunities and reduce your tax burden.

With us you have a competent partner at your side. We analyze your current situation and develop solutions tailored to your individual needs. The upcoming tasks will be professionally handled by us in highest quality.

Tax and business management issues are so closely intertwined that an optimal tax solution is not possible without simultaneous business management consulting. Business management issues are of central importance for every entrepreneur.

Especially in times of digital change, it is important to question one's own entrepreneurial strategy. Future viability is created through dialog. It is important to us that you achieve long-term success through our consulting.


DELTA AUDIT GmbH is a supra-regionally active auditing and tax consulting company founded in 2006 and based in Mainz. The firm is managed by the founder and owner Christian Müller as a professional. Together with his team, the firm stands for the auditing and consulting of medium-sized companies and private individuals at eye level. We convince through our many years of experience and expertise. We prefer short ways and an easily understandable language. What our clients appreciate about us is that we focus on personal service. We develop individual solutions for our clients, always keeping an eye on future challenges. The focus of our activities is on auditing. We serve production, trading and service companies from a wide range of industries and legal forms, in particular from the tourism sector.


The secret of success is to understand the viewpoint of others.






Christian Müller is a member of the Institute of Public Auditors in Germany.

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