International tax advisors for the US, Germany & Switzerland.
We help founders, expats and mid-market groups solve cross-border tax—compliantly, fast, and in plain English/German.
One team for US/DE/CH
One engagement across jurisdictions, consistent advice and one point of contact.
Senior attention, fast turnarounds
Clear answers within 24–48 hours, no junior hand-offs.
Transparent, fixed-fee options
Defined deliverables and pricing before we start.
Sesch USA LLC is a U.S.-based tax advisory firm specializing in U.S. tax compliance, cross-border structuring, and international taxation between the United States, Germany, and Switzerland.
Working in close cooperation with Sesch Group GmbH Wirtschaftsprüfungsgesellschaft (Germany) and Sesch Taxrep GmbH (Switzerland), the firm provides integrated advisory services for individuals, companies, and financial institutions operating across these three jurisdictions.
Core areas of expertise include:
- U.S. tax advisory and compliance services for private and corporate clients (taxrep.us)
- International tax coordination between the U.S., German, and Swiss tax systems
- Advisory for foreign financial institutions on U.S. tax matters, including FATCA and Qualified Intermediary (QI) compliance (ustaxbanks.com)
Through this network, Sesch USA LLC supports clients in navigating complex international tax regulations with precision, consistency, and a strong focus on regulatory compliance.
Reliable tax advice requires more than technical expertise – it demands an understanding of how U.S., German, and Swiss tax systems interact in practice.
Our work focuses on providing clear, consistent, and compliant solutions for clients who operate across borders or maintain international investments.
Whether it is U.S. income taxation, cross-border structuring, FATCA and QI compliance, or the coordination of filings in multiple jurisdictions, every engagement is handled with precision and personal responsibility.
The goal is always the same: to provide certainty in a complex tax environment and to build lasting confidence through transparent communication and dependable results.
Alexander Foelsche
Managing Partner – Sesch USA LLC
Certified Public Accountant (US)
AICPA U.S. International Tax Certificate
Wirtschaftsprüfer (DE)
Revisionsexperte (CH)
Certified Financial Services Auditor
MoR Management of Risk Practitioner
PRINCE2 Practitioner in Project Management
Sesch Group GmbH Wirtschaftsprüfungsgesellschaft
Sesch Group GmbH is a German public audit firm providing specialized assurance and advisory services for regulated financial and real-estate sectors. We support cross-border clients together with Sesch Taxrep GmbH and Sesch USA LLC.
Our services include statutory audits and compliance reviews under German law:
- FinVermV audits for financial investment intermediaries (finvermv-pruefung.de)
- MaBV audits for real-estate developers and property managers (mabvprüfung.de)
- EWKFondsG audits related to the German Single-Use Plastics Fund (einwegkunststoffpruefung.de)
- Asset protection and wealth structuring (asset-protection-service.de)