Our services

We offer a one-stop shop of qualified tax and business experts combined with legal back-up.


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Whether you require traditional services such as payroll and financial accounting, annual accounts and tax declarations, other services such as tax planning, long-term planning and business management, or our specialised services of business valuation and international tax law, we are pleased to be of service to you.
Our clients are predominantly small and medium-sized firms and private individuals from all corners of Germany and, for international matters, from further afield.
Our partners and staff offer you reliable, competent and personal support. We would be happy to welcome you to our modern offices.


Our team

Our team includes tax consultants, a lawyer and fifteen other staff members qualified in the areas of payroll accounting, balance sheet accounting, taxation and business administration.

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For us it is important without saying that all our professionals and staff take part in continuous training to develop their skills.
We also place great value on our staff working as independently as possible in their specialist field. Mutual trust and collaboration are therefore emphasised.
Get to know us! We're looking forward to meeting you!



As you can see from our range of services, we offer a comprehensive service, both nationally and internationally, on a one-stop-shop basis.

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In order to make this possible, we have built up networks, both locally and abroad, with reliable partners on whom we can call at any time.
At national level, we have links in particular with auditors and specialised lawyers, but also with various associations, chambers and other organisations.
Internationally, we are represented in approximately 40 countries through the AITC network, made up of trusted consultants who are personally known to us. We are therefore able to provide you with assistance beyond Germany's borders.



The office was founded in Dortmund in the 1930s by Ferdinand Seiler, even before the profession of tax consultant existed.


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Ferdinand Seiler worked as an accountant, auditor and, after the Second World War, trustee. After his death in 1957, Wolfgang Seiler (1930-1997) took over the practice, initially as a tax agent then later as a tax consultant. However, Wolfgang Seiler's main activity was bankruptcy administration, and the office was already one of the leading firms in the area in the 1970s. After qualifying as a tax consultant, Martin Seiler (born in 1962) entered the new partnership as a partner, and his wife, Martina Seiler, herself a lawyer, followed in 1997. After years of growth, the firm is today a specialist in international consultancy and management consultancy, in particular in the areas business valuation and succession. While its clients at the beginning of the 1990s were still mainly local industrial businesses, including firms operating in the coal and steel processing industries typical of the Ruhr region, medium-sized service providers and manufacturers operating in other sectors, including far beyond the Ruhr region and Germany, now feature among our valued clients of whom we are proud.