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Lawyers

Guillermo Fonseca

Guillermo Fonseca

Work Department

Tax

Position

Counsel at Alvarez Abogados.

Career

With over 30 years of experience in tax law, Guillermo has built a distinguished practice advising clients on a full spectrum of tax matters, with particular emphasis on the tax structuring of complex corporate and transactional operations. His work is characterized by a deep understanding of the legal and commercial implications of taxation, allowing him to deliver strategic, value-driven solutions to both domestic and international clients.

Guillermo has played a key role in some of the most significant local and cross-border transactions in recent decades, providing counsel on mergers and acquisitions, corporate reorganizations, financing structures, and cross-jurisdictional investments. He regularly advises high-profile clients across a variety of industries, offering tax guidance that ranges from day-to-day compliance and operational issues to sophisticated, tailor-made solutions for high-stakes business initiatives.

His experience extends to advising clients on the tax aspects of inbound and outbound investment strategies, ensuring alignment with local regulations while maximizing global tax efficiency. Guillermo is known for his pragmatic approach, technical precision, and ability to work collaboratively with multidisciplinary teams in high-pressure, deal-driven environments.

Languages

Spanish and English.

Memberships

Member of the Chilean Bar Association.

Member of the International Fiscal Association.

Education

Guillermo is a lawyer from Universidad de Chile (1995) and LL.M. in Tax Planning from Universidad de Santiago (2008).

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