JAN SPIECKERMANN

Combining human creativity with smart technology is not only my passion, but also my expertise.

Find out more about Jan

As a Tax Advisor, industrial engineer, and business lawyer – with professional experience at a "Big Four" firm, among others – I have been successfully combining both worlds for many years: knowledge times interpersonal skills to the power of digitality. In this way, we can work closely and familiarly with our clients, even over hundreds of kilometers, for maximum flexibility and proximity, and, of course, maximum results. It is a concept that I not only live myself but also want to pass on to all parties with our firm.

Short CV

  • Certified consultant for online trade / e-commerce (IFU / ISM gGmbH)
  • Specialist consultant for the healthcare sector (DStV e.V.)
  • Founder and partner of 3S.tax Steuerberatung
  • Activity as a Tax Advisor / Manager at a Big4 auditing company in Berlin and Düsseldorf; VAT / Tax Management Consulting division; advising multinational corporations
  • Activity as a Tax Advisor at a medium-sized auditing company in Hamburg and Berlin; Division: Consulting for startups and technology companies
  • Worked as a tax assistant for a medium-sized auditing / tax consultancy firm in Düsseldorf; area: general tax advice; annual financial statements; tax returns
  • Studied business law in Hamburg; degree: Master of Laws (LL.M.); specializing in tax law
  • Studied industrial engineering in Hamburg; degree: Bachelor of Engineering (B.Eng.); focus on business informatics
  • Training as a wholesale and foreign trade merchant

DIGITAL. SIMPLE. HUMAN.

Datev Digitale Kanzlei 2025

3S.tax stands for modern tax advice that is technically profound, digitally sophisticated and humanly clear. We combine tax expertise with technological understanding – with one goal: to solve complex issues in a way that works for you.

We support companies, families and private individuals who value reliable advice, clean structures and strategic thinking. The following applies: We don't tell you what you want to hear – but what you need to know to make the right decisions.

Our focus lies where traditional tax consulting often ends.

Tax consulting 5.0
The renaissance of the human touch

More about us – 3S.tax

We are a modern tax consultancy with a clear focus: clean structures, reliable results and solutions that work in everyday life. We don't tell you what you want to hear – we tell you what you need to know in order to make good decisions.

Why 3s.Tax – your Advantages

  • In-depth expertise in e-commerce, VAT, and international structures – including OSS/IOSS, third-country transactions, and complex supply chains.
  • Strong in contentious tax audits – from risk analysis to negotiation.
  • Second Opinion – independent second opinion with clear risk assessment and recommendation for action; implementation in tax compliance and in the ERP on request.
  • Tax Technology & ERP – Tax logic cleanly anchored in the system: Tax-Tech & ERP consulting that really works.
  • Compliance & Risk – pragmatic tax compliance setups that withstand audits.

Main Areas of Focus

E-Commerce

Platform business, marketplaces, fulfillment, OSS/IOSS: We structure VAT, goods flows, and reporting in such a way that scaling does not become a tax trap.

International Tax Law

Cross-border structures, permanent establishments, withholding taxes – we plan cleanly and support implementation & documentation.

Consulting in tax audits

Early risk analysis, stringent argumentation and clear strategy – also as a sparring partner for other consultants.

Special VAT consulting

Supply/service chains, chain transactions, intra-community matters, digital services – legally compliant and process-proof in the ERP.

Tax Criminal Law & Prevention

In cooperation with specialized partner lawyers: clean processing, clear communication, preventive controls.

Who We Work For

Large E-Commerce Companies

Scalable structures for marketplaces, international flows of goods and reporting – details under e-commerce and International Tax Law.

Digital Entrepreneurs

Lean processes, clean VAT, clear compliance – more at Startup Consulting, VAT, and Tax-Tech & ERP.

Second Opinion

If You Want Absolute Clarity

You already have an assessment – but want to be sure? We check independently, point out risks, alternatives and side effects and deliver a clear, ready-to-sign recommendation. On request with implementation in tax compliance and in the ERP.

Next Step

Short & Concise

Book a short meeting, share documents, plan the result – quickly and in a structured manner. We are particularly strong when things get contentious or international. And if you only need a second opinion: Second Opinion is possible at any time.

Find out more about our tax advice 5.0

Oh yes, Industry 4.0 arose from the idea of creating highly automated environments. Various technologies, sensors, data processing, connectivity and cloud computing were to be at the service of companies. An era was promised and predicted in which people would play an increasingly minor role in working life. In production, people would increasingly disappear and IoT and robotics would take over repetitive and easily standardized tasks in their place. But what should we do now, in the midst of this era? And above all, what is really important to us as people, as individuals? Can we now devote ourselves to the essential things again? If we take a look at Industry 5.0, we can see that existing technologies are actually being used today, that they are giving us completely new working environments and that we are about to enter the next era of working methods. This is because technologies enable mobility and freedom for the individual. New concepts are finding their way into the world of work. With the result of greater diversification. And more time for the family, thanks to smart products.

But what exactly distinguishes 5.0 from 4.0? Technology and automation can only cope to a certain point without human input. Especially in our consulting area, human emotionality paired with artificial intelligence is the be-all and end-all. The combination of smart technology with human creativity is more in demand than ever. Especially in the tax area, advice is becoming increasingly difficult and fragmented. The Tax Advisor of today therefore uses the advancing technology to offer his clients far better services and greater added value than just a few years ago.

This is why we not only use our tax expertise for our clients, but also combine our individual creativity with the advantages of digitalization. This means that where there is no third-party software for specific client requirements, interfaces or entire software components are developed and programmed by our IT specialists and partners. In this way, we achieve the most effective and individual solution for all parties involved through human collaboration and the interplay of different disciplines. And this goal remains our greatest.

Tax consulting 5.0
The renaissance of the human touch

For all these questions and our answers to make sense, we need to look back a few years together. We are skipping a few innovations and are at the beginning of the noughties. The industrial revolutions 1.0 to 3.0 are behind us. Industry 4.0 was on everyone's lips at the time, and to some extent still is today. But stop, what was that again?

Find out more about our tax advice 5.0

Oh yes, Industry 4.0 arose from the idea of creating highly automated environments. Various technologies, sensors, data processing, connectivity and cloud computing were to be at the service of companies. An era was promised and predicted in which people would play an increasingly minor role in working life. In production, people would increasingly disappear and IoT and robotics would take over repetitive and easily standardized tasks in their place. But what should we do now, in the midst of this era? And above all, what is really important to us as people, as individuals? Can we now devote ourselves to the essential things again? If we take a look at Industry 5.0, we can see that existing technologies are actually being used today, that they are giving us completely new working environments and that we are about to enter the next era of working methods. This is because technologies enable mobility and freedom for the individual. New concepts are finding their way into the world of work. With the result of greater diversification. And more time for the family, thanks to smart products.

But what exactly distinguishes 5.0 from 4.0? Technology and automation can only manage up to a certain point without human input. Especially in our consulting area, human emotionality paired with artificial intelligence is essential. The combination of smart technology with human creativity is more in demand than ever. Especially in the tax area, consulting is becoming increasingly complex and detailed. The Tax Advisor of today, therefore, uses advancing technology to offer his clients far better services and greater added value than just a few years ago.

This is why we not only use our tax expertise for our clients, but also combine our individual creativity with the advantages of digitalization. This means that where there is no third-party software for specific client requirements, interfaces or entire software components are developed and programmed by our IT specialists and partners. In this way, we achieve the most effective and individual solution for all parties involved through human collaboration and the interplay of different disciplines. And this goal remains our greatest.

Our values and what drives us

Our law firm thrives on versatility. An essential part of this is thinking outside the box. For more humanity, individual solutions and digital foresight.

Bearing responsibility

Trust is not just a good feeling, but the essential basis for long-term and effective cooperation. That is why we use our expertise to the best of our knowledge and belief and attach great importance to responsible cooperation. Full of confidence and integrity.

Making connections

We see ourselves as a hub - between people and data, agile entrepreneurship and mostly rigid legal requirements, between inspiring visions and valuable experiences. In order to solve tasks in their best form and achieve the desired goals, it is important to us to understand people and their concerns precisely. Full of openness to new subject areas, appreciation for every project and great respect for our clients, employees and partners.

Preisschild Umsatzstsuerberatung

Setting innovations

We are driven by a breath of fresh air. That's why we not only have our finger on the pulse of the times, but also go one step further and take the lead in the digitalization of tax consulting - as pioneers. With the highest standards for our work and an innovative mindset that is constantly evolving.

Imparting knowledge

Transparency and comprehensibility open up the view and the scope of one's own possibilities. That is why we ensure that complex issues are presented in an uncomplicated way, communicate in simple language and via direct and short channels, and make tax advice not only efficient, but also an interpersonal and comprehensible experience for all parties. For more self-confidence and the highest quality on the digital path.

Our network moves us forward together!

Even something that doesn't sound quite ordinary at first is one of the most important things about our work: cooperation, teamwork, exchange, learning from each other and supporting each other in order to see and achieve the big picture in the end.

Find out more about our network

That's why we build our network. With empathy and a keen interest in our clients' goals. We have been building our network for many years. After all, we meet a wide variety of people every day and see the connections that result from all these encounters. People who share our philosophy and values and who are full of passion, mutual appreciation and openness to new ideas. We want to inspire people to trust each other and create great things. And above all, we want to inspire people to really live the word cooperation in order to tackle projects together. Our network not only offers complementary tax experts and lawyers from all necessary disciplines, it also goes a special step further. This is because the network spins out in all directions to ultimately unite again in a common hub. The cooperation between our clients and us.

We offer our clients experts in communication, branding, strategy consulting, experienced contacts and consultants for international trade in goods (especially from the Far East), procurement, logistics and consulting as well as for the entire supply chain. We see no limits to the professions of our cooperation partners.
Our clients can benefit from our network at any time on request. Feel free to contact us.

We connect you!

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3S.tax Steuerberatung - Spieckermann & Partner Steuerberatungsgesellschaft PartG mbB 97 Bewertungen auf ProvenExpert.com