The Firm
A firm dedicated to tax law, between Annecy and Geneva
COTAX is a law firm dedicated to tax law, based in Geneva. We act for companies and groups, their executives and shareholders, as well as for individuals and families whose wealth has an international dimension.
Background
A practice built on both sides of the border.
Education
Paris Bar School, CAPA. Admitted to the Annecy Bar (France) and to the Geneva Bar (EFTA/EU).
International firm
Tax law practice at EY, serving companies, groups and private clients.
COTAX France
Creation of the COTAX practice in France, in Annecy, dedicated to tax advisory and litigation.
COTAX Switzerland
Creation of COTAX SUISSE Sàrl in Geneva, rue des Bains, for a combined reading of Swiss and French law.
Working languages: French, English, Italian, Spanish.
Contact details
COTAX SUISSE Sàrl
35, rue des Bains, 1205 Genève, Suisse
CHE-400.324.700
Mon - Fri · 9am - 12pm and 2pm - 5pm
Book an appointmentThe lawyers
Two lawyers, one French-Swiss practice.
Me Gilles Colin
Partner
Me Gilles Colin
Partner
A lawyer specialised in tax law, Gilles Colin is a partner at COTAX, with dual expertise in domestic and international taxation. He advises and assists companies, executives and individuals on their tax and wealth strategy, tax risk management and the resolution of disputes with the tax authorities, including maritime taxation and international projects.
- Bar admissions
- Annecy Bar · EU/EFTA list of the Geneva Bar
- Languages
- French, English, Italian
Areas of practice
- Tax audits and litigation
- Corporate and transaction taxation
- International taxation
- Restructurings, M&A, Private Equity, LBO
- Real estate and wealth taxation
- Maritime taxation (yachting)
Me Kevin Sirman
Tax lawyer
Me Kevin Sirman
Tax lawyer
A tax lawyer admitted to the Geneva and Paris Bars, Kevin Sirman has nearly 10 years of experience in international taxation acquired in France and Switzerland, in particular in the tax department of a major energy group and at Big Four firms. He advises wealthy private clients on tax residence, cross-border wealth structuring and disputes with the tax authorities.
- Bar admissions
- Geneva and Paris Bars
- Languages
- French, English
Areas of practice
- Tax residence and international mobility
- Cross-border wealth structuring
- Disputes with the tax authorities
- Withholding tax and taxation at source
Our strengths
What sets COTAX apart from other Geneva tax firms.
Tax litigation
Objections, hierarchical appeals, administrative courts and courts of appeal in France. Cantonal courts and the Federal Supreme Court in Switzerland.
France Switzerland cross-border
Tax treaties, double taxation, international administrative assistance, automatic exchange of information.
Indirect taxes
French and Swiss VAT, exemptions, public authorities, academic institutions, foundations and NGOs.
Voluntary disclosure & compliance
Non-punishable voluntary disclosure, simplified recovery of tax for heirs, bringing filings into compliance.
Our approach
From diagnosis to defence, a method in three stages.
Diagnosis
A full tax review of your situation, under French as well as Swiss law, before any recommendation. We identify open risks, running deadlines and the tax optimisation genuinely available.
Structuring
Documented and secure structures: technical memos, sources and case law cited, risks identified.
Defence
Handling audits and litigation, from the initial objection up to the administrative and federal courts.
Our commitments
A practice built on principles, proven by experience.
Three commitments define our relationship with every client: confidentiality, responsiveness and availability. The rest is a matter of method.
Confidentiality
Legal professional privilege protects every exchange, from the first meeting to litigation.
Responsiveness
Short tax deadlines require fast answers. We organise ourselves to meet them.
Availability
A single, reachable point of contact who knows your file from end to end.
Technical rigour
Documented recommendations: technical memos, sources and case law cited, risks identified.
Cross-border reading
Tax treaties, double taxation, administrative assistance: both legal systems, simultaneously.
Independence
Advice free from any commercial interest, focused solely on the security of your situation.
A tax question between France and Switzerland?
Set out your situation in a confidential appointment. We answer with precision, under Swiss as well as French law.
Law firm in Geneva · 35, rue des Bains, 1205 Geneva · Monday to Friday