Swiss tax law
Admitted to practise in Switzerland, we advise and litigate on Swiss tax matters: residency, lump-sum taxation, income and wealth tax, holding structures, rulings and disputes before the cantonal and federal authorities.
Swiss tax lawKSI Attorneys-at-law LLC · International tax
A boutique tax firm for complex cross-border situations
Advising high-net-worth individuals and families on cross-border structures, tax residency and complex disputes, as Swiss and French tax counsel, with in-depth knowledge of how US and Brazilian tax rules affect residents of both countries.
- AdmittedGeneva and Paris Bar Associations
- CounselEvery client works directly with senior counsel
- ConfidentialityStrict professional secrecy
Geneva46.20°N · 6.14°E
Paris48.88°N · 2.31°E
São Paulo23.59°S · 46.69°W
01Areas of law
Four practices, one cross-border perspective
Each matter is handled by senior counsel, with the tax consequences in every jurisdiction considered from the outset.
01
Tax law
International tax planning and tax disputes for private clients with ties to several countries.
Read more02Corporate law
Company formation, holding structures and governance for entrepreneurs and investors.
Read more03Immigration law
Residence permits, work authorizations and lump-sum taxation for those relocating to Switzerland.
Read more04Real estate acquisition
Securing the purchase of a home or investment property in Switzerland and France, from eligibility to closing.
Read more02Specialized expertise
Swiss and French tax law, and the reach of US and Brazilian rules
French tax law
Admitted to practise in France, we advise and litigate on French tax matters: residency, exit tax, French real estate and IFI, gifts and inheritance, tax audits and proceedings.
French tax law
Also for residents of Switzerland and France
US connections
Citizens and green card holders living in Switzerland or France: how US worldwide taxation interacts with local tax, the foreign tax credit and treaty positions.
US connectionsBrazilian connections
Residents with Brazilian income, assets or family: the treaties with Switzerland and France, assets held abroad, holdings and succession.
Brazilian connections03The firm
Complex international situations deserve senior-level attention, not commoditised advice.
KSI Attorneys-at-law LLC is a boutique tax firm founded by Kevin Sirman, a Franco-Swiss attorney-at-law with ten years of experience in international tax law, registered at the Geneva and Paris Bar Associations.
We operate from Geneva, Paris and São Paulo, advising clients across Europe, the Americas and beyond, in English, French, Portuguese and conversational Russian.
About the firm10Years in international tax law
4Languages — EN · FR · PT · RU
3Offices — Geneva · Paris · São Paulo
04Relocation to Switzerland
A stable foundation for your life, your family and your wealth
In a world of shifting regulations and political uncertainty, Switzerland stands apart.
We assist high-net-worth individuals and entrepreneurs at every stage: residence permits, lump-sum taxation, the transfer of assets and the purchase of a home.
Relocating to Switzerland