Competent, Clear & Personal
Your Trusted Tax Advisor in Mönchengladbach

For over 40 years, our tax firm in Mönchengladbach has been supporting business owners, self-employed professionals, private individuals, and non-profit organizations with clear, reliable, and tailor-made tax advice.

Our commitment:
clear solutions, long-term support, and optimal tax outcomes.

Tradition and Experience
Your Tax Advisory
Firm in Mönchengladbach Since 1981

The firm was founded in 1981 by Franz-Josef Thelen. Today, we are a well-established team that has been welcoming clients for decades in a pleasant and professional atmosphere. At our offices on Bettrather Straße 75 — right next to the Bunter Garten — we provide a calm setting where we take the time to focus on your tax-related needs.

Benefits
Why We’re the
Right Partner for You

  • Over 40 Years of Expertise
    Our firm stands for reliable, highly qualified tax advice — from the initial consultation to long-term support.
  • Clear and Understandable Tax Advice
    We make complex tax matters easy to understand. We explain, advise, and develop solutions tailored to your individual needs.
  • Personal Support
    We listen, think ahead, and act proactively — for your financial success and long-term tax security.
  • Long-Term Client Relationships
    Many of our clients have trusted us for decades — a clear sign of transparency, close cooperation, and quality.

Our Services
Tax Advisory Services for…


For over 40 years, we have provided our clients with expert, clear, and reliable tax advice, combined with a high level of personal commitment. This is how we build trust and long-term partnerships.

German tax law often appears complex and difficult to understand. We are happy to keep track of everything for you, translate complicated regulations into clear and understandable language, and do everything we can to achieve the best possible outcome for you.

We advise business owners, self-employed professionals, and private individuals. In addition, many non-profit organizations are among our clients.

  • Tax returns and annual financial statements

  • Financial accounting and payroll accounting

  • Support during tax audits

  • Individual tax planning and optimization (in particular choice of legal form and succession planning)

Get in Touch
Personal. Reliable. Solution-oriented.

Whether it’s a personal tax return, starting a business, or complex tax matters: we support you with expertise and commitment. Our goal is to provide clarity, minimize tax risks, and make the most of your tax advantages.

Are you looking for a tax advisor in Mönchengladbach who explains what really matters in a clear and understandable way? We look forward to getting to know you.

Contact us for an initial consulation –
we’re happy to help.

© 2026 - Sebastian Thelen Steuerberatung // All rights reserved.