Your tax advisors in Siegen, Kreuztal, Olpe – and throughout Germany
Your Numbers. Our Responsibility. Your Relief.
Taxes are complex – but not complicated when you have the right partner by your side. We bring clarity to tax matters, translate paragraphs into understandable recommendations and guide you with foresight – personally, digitally and proactively. We support clients not only in Siegen, Kreuztal and Olpe, but throughout Germany – efficiently, flexibly and always within easy reach.
Your tax advisor for Siegen, Kreuztal, Olpe – and throughout Germany
Osman Tekin – Experience, Reliability and Foresight
Osman Tekin supports companies and private individuals on all tax and business management matters – factual, structured and with a deep understanding of entrepreneurial contexts. His commitment: clear analyses, well-considered solutions and advice that not only convinces professionally but also stands up in practice.
His professional path took him over several years as a tax advisor and audit manager to renowned auditing and tax consulting firms in South Westphalia. H & Co. KG. There, he primarily looked after medium-sized clients from industry, mechanical engineering, construction as well as the healthcare and social services sectors. The experience from this period continues to shape his work to this day – as does his pronounced understanding of processes, structures and industry-specific particularities. A further focus lies in the area of tax criminal law. In 2025, Osman Tekin successfully completed the further education programme at the FernUniversität in Hagen and has since been authorised to use the designation of Certified Adviser in Tax Criminal Law (FernUniversität in Hagen – Institute for Scientific Further Education).
He thus stands by his clients with sound expertise even in particularly sensitive constellations – for example in voluntary disclosures, tax criminal proceedings or as part of preventive tax compliance advisory. In this area, he combines specialist knowledge with sensitivity and strategic thinking.
Alongside his work in the firm, Osman Tekin is active in vocational training and continuing education: as a member of the examination committee for tax assistants and tax specialists at the Steuerberaterkammer Westfalen-Lippe as well as a specialist proofreader for balance sheet tax law at Lehrgangswerk Haas GmbH.
Your partner for national and international tax matters and digital solutions
Tax consulting with foresight – for Siegen, Kreuztal, Olpe and throughout Germany
Osman Tekin advises clients from various industries with a particular focus on national and international tax matters and digital processes. Thanks to his language skills in German, English and Turkish, he ensures secure, culturally sensitive communication – even across borders. His focus areas at a glance:
Tax consulting for special professional groups
Doctors and healthcare professionals, e-commerce traders, influencers and start-ups – with industry expertise and an individual perspective.
Digitalisation & process optimisation
More efficient workflows through the use of modern technologies, such as invoice-related integrated control systems.
Digital tax consulting
Bookkeeping, payroll, tax returns and annual financial statements – digital, transparent and efficient.
International tax law
Cross-border consulting for private individuals and businesses – legally sound and solution-oriented.
Real estate tax law
Support with acquisition, management and sale – tax-optimised and designed for practical use.
Expertise that moves mid-sized companies forward
Lotfi El Ayouchi – your tax advisor for Siegen, Kreuztal, Olpe and beyond
Lotfi El Ayouchi is one of the youngest tax advisors of his generation – combining broad expertise with deep practical experience. For many years, he has been supporting mid-sized companies on all tax and business management matters – from the classic preparation of annual financial statements through demanding structuring advisory to support during tax audits. The focus lies in particular on partnerships and corporations across a wide range of industries. Clients value his structured, solution-oriented approach, his clear language and his eye for the essentials – especially when things become complex. Shareholders and entrepreneurial personalities with special requirements, for example in succession matters or special projects, also regularly turn to him for support. Many engagements also come from the healthcare and advisory services sectors. A particular professional focus also lies in the area of tax criminal law: in 2025, Lotfi El Ayouchi successfully completed the further education programme at the FernUniversität in Hagen and has since been authorised to use the designation Certified Adviser in Tax Criminal Law (FernUniversität in Hagen – Institute for Scientific Further Education).
He thus stands by his clients with the necessary professional depth even in sensitive matters – whether preventively as part of a clean tax compliance strategy or as a reliable partner in tax criminal proceedings. Particularly in critical situations, sound knowledge is required – and this is precisely where he can apply his experience and specialisation in a targeted way.
Alongside his work in the firm, Lotfi El Ayouchi is also actively involved in the education and continuing development of the next generation of tax advisors – including as a member of the examination committees for tax assistants and tax specialists at the Steuerberaterkammer Westfalen-Lippe as well as a corrector in the subject 'Income Tax Law' at Lehrgangswerk Haas GmbH & Co. KG. He is also an active member of Wirtschaftsjunioren Südwestfalen e. V.
From bookkeeping to tax audits – competently at your side
Your tax advisor for Siegen, Kreuztal, Olpe and throughout Germany
With comprehensive language skills in German, English and Arabic, Lotfi El Ayouchi is able to advise and accompany clients from a wide variety of linguistic and cultural backgrounds on an individual basis. His professional expertise covers in particular the following focus areas:
Tax consulting for special professional groups
Doctors and healthcare professionals, e-commerce companies, online traders, influencers and start-ups – with an understanding of industry-specific requirements.
Succession planning & restructuring
Advisory on business succession as well as on holding structures, family companies and foundation models.
Digital tax consulting
Efficient handling of bookkeeping, payroll, tax returns and annual financial statements – digital, transparent and legally sound.
Support during tax audits
Expert support throughout the audit process – from preparation to communication with the tax authorities.
Representation before the Tax Court
Competent and assertive representation of your interests in tax court proceedings.
