Hall of fameO'Farrell
Miguel A.M. Tesón is the Partner in charge of the Tax Law Department. He joined the firm in 1989.
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Tax
O'Farrell
O'Farrell is widely recognised for its exceptional track record in tax litigation, successfully representing corporates and individuals in complex, precedent-setting tax disputes before all levels of national, provincial and municipal courts. Market segments where the team is particularly strong include energy taxation, new taxes on extraordinary wealth, transfer pricing, tax inflation disputes, and discrepancies between double conventions and local regulations. Practice head Miguel A.M. Tesón is a stand-out practitioner with expertise spanning cross-border transactions, tax planning for foreign corporations, transfer pricing, federal tax law and local taxes. He receives high quality senior support from a strong bench of partners: Valeria Estathio has deep expertise in federal and international tax law; María Valls has a strong tax disputes practice; and Guillermo Lalanne is an authority on constitutional tax law and complex litigation.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
‘The O'Farrell tax department is made up of professionals with exceptional technical knowledge and the ability to combine this with practical experience. They have knowledge that makes a difference when it comes to proposing a strategy.’
‘Miguel Teson has unique experience in litigation. Celina Valls is the country's number one expert in inflation adjustment. Guillermo Lalane is recognized for his technical knowledge and experience. They are top-level professionals.’
Key clients
- Pampa Energía
- Naturgy Argentina
- Droguería del Sud
- Ford Argentina
- Importadora y Exportadora de la Patagonia
- Grupo Telefónica Argentina
- Biogenesis Bago
- Transener
- Sanofi
- Sacde
- Pop Argentina
- Telesistema
- Adecoagro
- IPH
Work highlights
- Submitted a claim on behalf of Telefónica de Argentina challenging the constitutionality of prohibiting inflation adjustment provisions to asset depreciation for income tax purposes; the Federal Tax Court sided with the company, establishing that the prohibition is not compatible with the property rights guaranteed by the Constitution.
- Obtained three favourable decisions from the Social Security Chamber of Appeals on behalf of Transener confirming the social security tax treatment applicable to companies with minority participation of the Federal State as a consequence of the privatisation of the pension regime.
- Obtained two preliminary injunctions in favour of Telefónica Móviles and AMX preventing the Municipality of La Matanza from imposing a local tax that was deemed unconstitutional.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.
Leading individuals
O'Farrell
Guillermo joined O’Farrell in 1999 and since 2007 he´s been is a Partner of the Tax Law Department. His main areas of practice are constitutional tax law and complex tax litigation, with focus on national tax law and local taxes.
Next Generation Partners
O'Farrell
Valeria Estathio has been working in the Tax Department of O’Farrell Law Firm since 2005 and has been a Partner since 2014.
O'Farrell
Celina Valls is a Partner at O'Farrell's Tax Department. She joined the firm in 2006. She leads complex tax disputes relating to international and national taxation matters. She is in charge of litigations related to transfer pricing. In addition, she advises both local and foreign companies on international, national and local taxation.
Practice head
The lawyer(s) leading their teams.
Miguel Tesón