Profile
Work Department
Position
Partner
Career
Juan Carlos has been part of the firm since 2012 and joined as a partner in 2016. He specializes in tax matters (advisory and litigation), an area in which he has excelled throughout his career in highly complex cases. He has provided tax advice to clients such as Avianca and Ingenio Palo Gordo.
Before joining Mayora & Mayora, he was legal advisor to the Superintendency of Tax Administration (SAT) and consultant to the Constitutional Court of Guatemala, as well as researcher in tax law at the University of Salamanca. Chambers & Partners and The Legal 500 have recognized him as an outstanding professional in this field.
He has been a professor of tax law at several universities, both in undergraduate, masters and doctoral studies. His publications include several articles on tax and administrative law issues, on which he also frequently lectures at national and international conferences. He also publishes quarterly tax articles for Lataxnet/WTS, a global network of tax and transfer pricing law firms, to which the firm also belongs. Lastly, he served as President of the Latin American Institute of Tax Law, the only Guatemalan lawyer to have held such position.
Languages
Memberships
Education
DOCTORATE IN FINANCIAL AND TAX LAW UNIVERSITY OF SALAMANCA, SPAIN
DIPLOMA OF ADVANCED STUDIES IN FINANCIAL AND TAX LAW UNIVERSITY OF SALAMANCA, SPAIN
DEGREE IN FINANCIAL AND TAX LAW UNIVERSITY OF SALAMANCA, SPAIN
DIPLOMA OF ADVANCED STUDIES IN FINANCIAL AND TAX LAW UNIVERSITY OF SALAMANCA, SPAIN
BACHELOR OF LAW FRANCISCO MARROQUÍN UNIVERSITY, GUATEMALA
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Testimonials
Collated independently by Legal 500 research team.
- ‘The firm stands out thanks to the vast experience of the partner responsible for the tax practice.’ ‘The team delivers great service and attention to detail, knowledge of their clients and availability.’ 'They explain tax issues in a way that is clear for non-lawyers, but have an in-depth understanding of the technical and legal elements of the situation. They present effective and genuine solutions, minimising risk for the client. They are not overly aggressive in their advice, unlike other firms, which can increase the risk of subsequent inspections and adjustments by the treasury.' 'Juan Carlos Casellas has deep knowledge of the Guatemalan legislation on tax issues and comes up with practical and effective solutions to the problems presented, without increasing the risk for the client.'
Key clients
- Arroyo/EDC Applus Norcontrol Belcorp Guatemala Bolsa de Valores Nacional de Guatemala Brizmud Cindu de Guatemala Elevadores Otis GBM de Guatemala Grupo Monge Grupo Salinas Ingenio Palo Gordo Pochteca Guatemala

