Tax consulting company –
specializing in
indirect taxes

Approach

We are legally experienced tax and customs specialists. At the same time, we know from our own experience the demands that clients place on excellent professional advice that can also be implemented in practice.
We therefore advise in the same way as we would like to be advised ourselves. We ensure that our clients can implement their business goals with the greatest possible legal certainty.

Consequently, we act according to the following principles:

  • We look for a concrete and feasible solution proposal for every problem.

  • Only practicable solutions are real solutions. Theoretical consulting "constructs" and "disclaimers" do not help the client.

  • We communicate clearly, directly, and comprehensibly with clients and authorities.  

     

Jan Olaf Leisner

Attorney at law, tax law specialist

Vita

Jan Olaf Leisner has more than 15 years of experience in tax and customs compliance. Among other things, he helped develop the customs compliance program for one of Germany's largest customs departments, assisted with AEO certifications and successfully concluded numerous proceedings for customs violations. His clients in the field of customs compliance include groups in the automotive and supplier industries as well as in logistics. Companies also rely on Jan Olaf Leisner's many years of experience in preventive consulting to avoid irregularities and in internal company investigations to clarify and search for the causes of errors.

 

In addition, Jan Olaf Leisner has been one of Germany's leading criminal tax lawyers for two decades. In his more than 20 years of professional practice, he has represented clients in many of the most significant national and international tax and criminal tax proceedings. If violations do indeed result in fines or criminal proceedings, he is thus able to provide advice to the affected companies, board members and managing directors. In particular, he has the highest level of expertise in the preparation of supplementary tax and customs declarations or voluntary self-disclosures.

Matthias Kern

Certified tax advisor, Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

Matthias Kern is a certified tax advisor and and has a degree in finance. He gained experience in public authorities, consulting, and the automotive and logistics industry.
He completed his studies with the tax authorities and worked as a customs officer for a total of 8 years. As a senior manager in an internationally operating tax consulting firm and as a director in a Big 4 auditing firm, he has advised medium-sized companies and large corporations on customs and excise duties as well as on value-added tax and has thus been able to gain 10 years of "consulting experience". He was also employed for several years in management positions at two well-known corporations, including as a head of a customs department with several hundred employees and as a head of global customs strategy.

 

Matthias Kern advises on all topics of customs, excise taxes and VAT. His consulting focus is on organizational and process consulting as well as on IT solutions in the field of indirect taxes (software and data management).

Dr. Sebastian Engler

Lawyer, tax consultant, tax law specialist

Dr. Sebastian Engler was born in 1975, is married, and has three children. After completing his high school education and mandatory military service, he studied law at Albert-Ludwigs-Universität in Freiburg im Breisgau. Following his legal clerkship, Dr. Engler worked as a research assistant for three years at the Chair of Tax Law under Prof. Dr. iur. Georg Crezelius at the University of Bamberg/Erlangen. He obtained his doctorate on the topic of "Reversals in Gift Tax" and successfully completed the tax advisor examination.

 

Since 2005, Dr. Engler has been working as a tax lawyer and tax advisor. He initially worked at an international law firm specializing in tax law. In 2008, he was awarded the title of "Certified Specialist in Tax Law." Since 2010, Dr. Engler has been employed at Leisner Rechtsanwälte, where he became a partner in 2013.
For over 15 years, Dr. Engler has been handling mandates in various areas, including tax disputes of all kinds, customs and tax criminal law, voluntary disclosures, correction filings, and customs and tax compliance. In the field of tax consulting at LKL Steuerberatung, Dr. Engler is also responsible for the value-added tax department.
In the area of tax dispute resolution, Attorney Dr. Engler provides legal representation to his clients, particularly in contentious matters with tax authorities during tax audits, objection proceedings, and before all levels of financial courts, up to the Federal Finance Court. He represents individuals as well as companies and entrepreneurs of all sizes and industries.

René Jentzsch

Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

René Jentzsch holds a degree in finance (FH). He has gained several years of experience both in the authority, in the industry and in consulting. He graduated from the tax administration and worked as a customs officer for a total of 10 years - most recently in the overall project management ATLAS in the Federal Ministry of Finance. From 2007 to 2017, he held management positions in customs and foreign trade at two well-known DAX 30 corporations. His tasks there included the support of international projects, process optimizations and the implementation of IT-supported solutions. As a director in a tax consulting company, he established a new business field for the operational support of clients in addition to consulting focal points in the process and customs IT environment (e.g. specialist consulting for implementations with SAP GTS).

 

Mr. Jentzsch advises on all topics of customs and excise law. His consulting focus is on process design in interaction with IT-supported solutions for electronic customs and foreign trade processing.

Dominik Peter

Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

Dominik holds a degree in finance. He has already gained several years of experience in both government and industry. He graduated from the tax administration and worked as a customs officer for a total of 4 years. From 2017 to 2021, he was responsible for compliance in the areas of customs and foreign trade at a well-known corporation in Austria. His tasks there included, among others, the support of international projects, the implementation of guidelines and standards, the joint development of the customs strategy as well as having the position as deputy of the head of customs.


Mr. Peter advises on all topics of customs and excise law. His main areas of expertise are process consulting and the assessment of tax law issues in the field of indirect taxes.

Anne Goullon

Master of Science (IT-Management), Graduate in Finance (Diplom-Finanzwirtin (FH))

Vita

Anne Goullon holds a degree in finance and a master's degree in IT Management (MSc.). She worked in the customs administration for a total of 10 years. Among other things, she worked for more than five years in IT projects and accompanied the design, implementation, and further development of various customs processing systems in Germany and at EU level.


Subsequently, she worked for several years as head of customs IT teams at an international logistics group and a well-known e-commerce company. She led development and support teams as well as IT projects and accompanied new and further developments as well as software migrations.


Anne Goullon advises on all aspects of customs and excise law, always with a focus on providing the best possible systemic support.

Stefan Krinner

Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

Stefan Krinner holds a degree in Finance (FH) and a Master's degree in General Management (M.A.).
He has already gained several years of experience in the authorities as well as in industry. He graduated from the tax administration and worked as a customs officer for more than 5 years. From 2017 to 2022, he held various positions at a well-known German car manufacturer. His tasks there included customs cost optimisation, the implementation and optimisation of import processes in the EU, the implementation of a customs service provider on the European side after Brexit, and support in enabling the customs function in the UK.
 
Mr Krinner advises on all topics of customs and excise law at LKL. His advisory focus is on litigation and the assessment of tax law issues in the area of indirect taxation.

 

Malte Conradi

Certified tax advisor, Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

Malte Conradi is a certified tax advisor and holds a degree in finance (FH).

He has more than nine years of professional experience, which he gained both in the authority and in consulting. Mr. Conradi graduated from the tax administration and worked as a customs officer for more than four and a half years before moving into consulting with a Big 4 accounting firm in 2019. There, as a manager and authorized signatory, he most recently advised predominantly medium-sized companies and large corporations on the topics of customs, excise and value-added tax. In addition, Mr. Conradi dealt with appeal and lawsuit proceedings, the support of tax audits as well as grant management in the context of company sales.

 

At LKL, Mr. Conradi advises on all issues of customs, excise and value added tax law. His consulting focus lies in process consulting as well as in the assessment of tax law issues in the field of indirect taxes.

Patrick Nieveler

Business Economist

Vita

Patrick Nieveler has been working in the field of customs, foreign trade and excise for more than 20 years. He has gained several years of experience in various groups in the mechanical engineering, consumer goods and automotive industries. From 2012 to 2022, he held a management position at a well-known German automotive manufacturer, where he was responsible for customs procedures, customs law, and energy and electricity tax. His responsibilities also included heading working groups focusing on European customs law at the German Association of the Automotive Industry (VDA) and the Federation of German Industries (BDI). Within the scope of these activities, he was significantly involved in the drafting of the Union Customs Code and its implementing regulations.
A personal concern of Patrick Nieveler is the education and training of young talents. In this context, he temporarily held a lectureship at the Federal University of Applied Sciences and thus supported the training of customs officers of the higher service. Currently, he holds a lectureship at the Augsburg University of Applied Sciences for the part-time course "Customs and Foreign Trade Management".
 
Mr. Nieveler advises LKL on all issues of customs and excise law. His consulting focus is on the implementation and process design of customs procedures, excise procedures as well as customs valuation and customs debt law.

 

Michael Sonntag

Graduate in Finance (Diplom-Finanzwirt (FH))

Vita

Michael Sonntag holds a degree in finance (FH). He has gained several years of experience in both customs administration and industry.

He graduated from the tax administration and worked as a customs officer for a total of 3.5 years. From 2012 to 2024, he worked for a well-known German car manufacturer in the area of customs and foreign trade - 10 years of which in a management position. In addition to employee development, he was responsible for ensuring customs compliance, process optimization and managing the further development of customs IT applications, among other things.

 

At LKL, Mr. Sonntag advises on all aspects of customs and excise law. He specializes in the implementation and process design of customs procedures, excise procedures and customs value and customs debt law.

Career

We are hiring!

You are motivated and committed, reliable and a team player? You are interested in exciting and at the same time highly challenging mandates and projects? Our firm, our consulting approach and our range of services arouse your curiosity? Then please contact us if you have one of the following qualifications:

Graduate in finance:

You have completed your studies at the federal or state financial administration and are looking for new challenges either directly after the graduation or after a few years of professional experience in public authorities, consulting, or industry.

Certified tax advisor:

You have successfully passed the tax advisor exam and have already gained at least 4 years of professional experience in the field of indirect taxes.

Lawyer:

You are a lawyer and have already gained at least 4 years of professional experience in the field of indirect taxes.