Experience since 1969: Tradition through innovation

Tax Consulting 4.0 - our digital services

We are shaping the future of tax consulting. Hannes & Kollegen is your partner on the way to the digitization of your accounting and financial reporting. With our electronic tenant PISA, you can easily exchange information with us, with banks and authorities - at any time, digitally and securely.
We'll create your paper bill. With our "Digital Accounts Payable Management" service, we can provide you with a complete digital processing of your incoming invoices - from entry through booking, to payment and archiving.

Classic Tax Consulting - what to expect anyway

Classic tax advice is natural to us. We create your financial accounting, payroll accounting, financial statements, tax returns and advise you in all tax matters.
We attach great importance to the quality of our work. For this reason, we regularly have our tax office management externally audited by TÜV Rheinland: We are certified according to the ISO 9001: 2008 standard and a holder of the quality seal of the German tax consultant association e.V.

Advice - individual and personal

Individual solutions for individual clients. In our consulting, we analyze the specific needs of your company to integrate the exact experts and services you need. We give you tailor-made, competent and interdisciplinary advice.

Your personal advisor keeps hold of the reins. This means that you are in the best hands during the whole company cycle - from start-up to business expansion and optimization to a possible sale.


Hannes & Kollegen is a member of the strong ETL family. The ETL consultants work in a close-knit network of different disciplines. We offer small and medium-sized companies, self-employed persons and freelancers in all industries all company-relevant consulting services from a single source. Whether you are looking for tax advice, legal advice, auditing, business consulting or financial services, our ETL Group is a tailor-made and seamless round-trip business.

Proximity to our clients plays an important role for us. Your personal advisor will keep hold of the reins and, as necessary, provide you with the exact experts and services you need. The personal support we provide to our clients and the high level of consulting quality are always our top priority in our national and international business.



Industry sectors

We support clients of all legal forms. Our focus is on the areas of Limited Liability Company, Limited Partnership, and registered natural or legal persons. In addition, we are experts on tax consulting for associations and professional associations.

Whether broadband or expert knowledge, our expertise covers a wide range of industries. We are particularly specialized in the areas of media and communication, civil engineering, construction, gardening, landscaping, transport and crafts.

We have various associations and professional associations and are supported by our experts.

For physicians, doctors, dentists, pharmacies, physiotherapists and private clinics, we offer the innovative industry solution ADVISION. At our location you will be looked after by experts in our sister company ETL ADVISA Berlin-Wilmersdorf GmbH.

For clients in the gastronomy and hotel industry sector, we offer the branch solution ADHOGA. Our specialized experts will assist you in our sister company ETL ADHOGA Berlin GmbH.