Ulises Castilla Flores

Ulises Castilla Flores

Baker & McKenzie Abogados, S.C.


Ulises Castilla is a partner in Baker McKenzie's Tax Practice Group in Mexico City. A seasoned litigator in the private and public sectors, he has more than two decades' experience in tax dispute resolutions and advising on tax strategies for the business sector. Prior to joining the Firm, Ulises was the head of litigation area of large taxpayers for the Tax Administration Service. His practice also covers tax planning and transfer pricing.

Practice Focus

Ulises' practice focuses on tax dispute resolutions, including conclusive agreements (alternative dispute resolutions), administrative appeals, nullity suits, and constitutional appeals (amparos). He has significant experience in tax audits and is included in rankings by Latin America Chamber and Partners as well as the International Tax Review, with the latter naming him as one of the top tax controversy practitioners in Mexico. Among Chambers and Partners' client interviews, Ulises is considered by clients as an excellent tax lawyer.

Ulises also provides advisory work on cases of anti-money laundering before the Financial Intelligence Unit of the Finance Ministry in Mexico.

Professional Associations and Memberships

  • Tax Law Commission of the Mexican Institute of Public Accountants - Member
  • IFA Commission of Court Precedents - Mexico Division

Corporate Responsibility

Ulises has been working on pro bono projects and community involvement. He has a particular interest in devoting part of his time to legal services that result in a social benefit


  • Mexico (1992)


  • Universidad Tecnologica de Mexico (Masters in International Business) (2006)
  • Universidad Autónoma de Nuevo León (Master's Degree, Tax) (2001)
  • Universidad Panamericana (Post Graduate Studies, Constitutional Law) (1999)
  • Universidad Tecnologica de Mexico (Post Graduate Studies, Labor Law) (1995)
  • Universidad Tecnologica de Mexico (Law Degree) (1992)


  • English
  • Spanish