05/02/2026
TGS welcomes a new member in Germany
New members
Guido Siebert & Maximilian Siebert
About NSBB Steuerberatungsgesellschaft & SBB Partner
Based in Berlin and Cologne, NSBB Steuerberatungsgesellschaft & SBB Partner bring deep expertise in audit, tax consulting, international tax law and business advisory services. With a longstanding commitment to client success, the combined firms are recognized for supporting national and international clients with a strong focus on medium-sized companies, internationally active groups and private clients. with tailored, high-quality solutions grounded in integrity, strategic foresight and international know-how. Their professional teams are committed to delivering expert solutions that protect and enhance client value across all stages of business development.
Main Services
NSBB Steuerberatungsgesellschaft and SBB Partner provide comprehensive professional services that meet the evolving needs of clients in both national and international contexts:
- Audit & Assurance: Statutory and voluntary financial statement audits, including consolidated reporting under IFRS and German commercial law.
- Tax Consulting & Compliance: Strategic tax planning, international tax law advisory, tax declarations and compliance services tailored to businesses and private clients.
- International Tax Advisory: Guidance on cross-border tax matters, transfer pricing documentation, employee secondment, inbound/outbound investment structuring and expatriate tax issues.
- Business & Financial Advisory: Business planning, liquidity and asset management, bank negotiation support, and operational performance optimization.
- Succession & Structuring: Support in corporate succession planning, restructuring projects and strategic long-term financial solutions.
These services reflect the firms’ commitment to delivering high-quality, tailored solutions that help clients navigate complex regulatory environments while driving business growth and long-term success.
Core Values
Aligned with TGS Global’s philosophy of Think Global Sustainability, the membership of NSBB and SBB is grounded in shared values that define their professional conduct and client relationships:
- Client-Focused Excellence: Providing precise, responsive and high-quality services tailored to client needs.
- Integrity & Professionalism: Upholding ethical standards, confidentiality and trust in all engagements.
- Strategic Collaboration: Building long-term relationships with clients and partners through proactive advice and mutual respect.
- Sustainable Growth: Supporting sustainable business development through thoughtful planning, compliance and risk management — a value deeply shared with the TGS Global network.


