Mr Guillermo Villaseñor-Tadeo > Sánchez Devanny > Mexico City, Mexico > Lawyer Profile

Sánchez Devanny
Guillermo Villaseñor-Tadeo photo

Work Department

Tax, Member of the Energy Industry Practice, Member of the Automotive Industry Practice.




Guillermo has more than nineteen years of experience in tax planning, including taxation of corporate restructuring transactions, mergers, acquisitions, and general tax advice, especially for business and multinational groups with operations in Mexico where he provides advice to achieve fiscal efficiency and provide assistance in developing tax policies for ongoing operations. His experience extends to transfer pricing, including the legal analysis of the implementation of policies, documentation and elaboration of economic studies and defense files to protect companies against potential tax investigations.  Guillermo has represented different industries before the Mexican Judiciary through constitutional (“amparo”) proceedings to contest the creation or amendments of tax laws that produce relevant economic negative effects, achieving tax refunds and the protection to future payments. He has also assisted multinational companies in complex cross-border tax litigation, in transfer pricing adjustments, cost-sharing arrangements, multinational restructures, and potential re-characterization of intercompany payments being able to successfully defend cases in the investigation stage or to reduce potential liabilities before contesting deficiencies before the Federal Tax Court.  Guillermo is a member of the firm’s Energy Industry Group, a group that includes practitioners of different law practice areas specialized in advising clients of the energy sector. Within the Energy Task Force, Guillermo specializes in tax laws affecting the energy sector. Prior to joining Sánchez Devanny, Guillermo was a partner at an international law firm where he was responsible of the tax litigation group, nationwide and lead tax counsel in different M&A transactions. He was named as “The National Expert” for his participation in the article Transfer Pricing 2018 included in the edition Getting the Deal Through  andExpert Panel 2018” by The Law Reviews for his participation in the Mexico Chapter of The Oil & Gas Law Review. He is fluent in English and Spanish.


Spanish, English.


  • Member and official Speaker of the Tax Affairs Committee of the American Chamber of Commerce.
  • Member and Chair of the Legal and Tax Affairs Committee of the Canadian Chamber of Commerce.
  • Member of the National Association of Corporate Counsel
  • Member of the International Fiscal Association (IFA).
  • Member of the Association of International Petroleum Negotiators.


  • Special Studies in International Taxation. Georgetown University Law Center, Washington, D.C., USA (2010).
  • Special Studies in Transfer Pricing. Universidad Anahuac / Universidad Cantábrica, México, D.F., México (2010).
  • Postgraduate Studies in Tax Law. Escuela Libre de Derecho, México, D.F., México (2004).
  • Law Degree. Universidad Iberoamericana, México, D.F., México (2000).

Lawyer Rankings

Mexico > Tax

Sánchez Devanny‘s international experience has given the practice substantial hands-on expertise in cross border tax matters. The 20-strong team is co-led by five partners: the experienced Ricardo Leon-Santacruz, who specializes in tax planning and transfer pricing; Guillermo Villaseñor-Tadeo, who leads on the litigation front; Luis Antonio González Flores, who has broad experience in national and international tax audits, anti-money laundering and anti-corruption compliance strategies, with a special focus on multinational enterprises; Mariana Eguiarte-Morett, who has ‘impressive technical knowledge on international tax matters’; and Abel Mejia-Cosenza, who specializes in international tax planning for both individuals and corporations.