enes +5411 4346-1000

“He is a very good and highly technical lawyer with a strong academic profile.”

Chambers & Partners 2022

Guillermo A. Lalanne


Phone +5411 4346-1038


Professional Experience

Guillermo Lalanne has been a Partner of the Tax Law Area since 2007. He joined the firm in 1999


He is a lawyer graduated from the Law and Social Sciences School of Universidad de Buenos Aires. He is a Doctor of Law graduated from Universidad de Navarra, Spain. With his PhD thesis “Los beneficios tributarios a la inversión y el empleo en el derecho comparado -España, Italia y Francia”, he obtained the highest grade (outstanding cum laude) in 1996.

He undertook a Major Program in Corporate Law (Programa de Especialización Derecho de Empresa, PEDEM).


He is distinguished as an expert in his practice area by the following international publications:

  • Chambers & Partners Global 2023: Tax
  • Chambers & Partners Latin America 2022: Tax
  • The Legal 500 2022: Tax (Leading Individual)
  • Latin Lawyer 250 2022: Tax
  • Leaders League, 2023:  Tax (Highly Recommended)

Professional Entities and Associations

  • Former President of the Board of Directors of the Argentine Fiscal Association (Asociación Argentina de Estudios Fiscales)
  • Member of the City of Buenos Aires Bar Association.

Academic Work

  • Professor of the Master’s Degree course in Tax Law at the Law School of Universidad Austral.
  • Professor of the Master’s Degree course in Tax Law at the Law School of Universidad Torcuato di Tella.
  • Professor of the Major in Tax Law Program at the Law School of Universidad Nacional de Córdoba.
  • In 2002, he was appointed national speaker by the Argentine Fiscal Association during the XXI Jornadas Latinoamericanas de Derecho Tributario sponsored by the Latin American Institute of Tax Law (Instituto Latinoamericano de Derecho Tributario, ILADT), for Theme I, entitled “El sistema tributario como instrumento de desarrollo e incentivación: hacia una teoría de la justicia en la no imposición.
  • Speaker in courses in Spain (Master’s Degree course in Tax Advice – Universidad de Navarra) and Peru (IX Encuentro Nacional Jurídico – SUNAT).

He participated as a speaker in seminars on topics of his practice area.