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Band 4
Provided by Ariane Costa Guimarães
Tax; Government Relations; Mattos Filho 100% Pro Bono
Ariane focuses her practice on tax litigation, particularly on legal strategies in Brazil’s superior courts. She assists clients with managing the impacts of court decisions on business and represents interests before the executive (Ministry of Economy) and legislative branches (National Treasury Policy Council and National Congress), coordinating the firm’s Government Relations practice. A vice-chairman of the Brazilian Bar Association – Federal District Chapter’s Superior Courts Commission (2022-2024), Ariane is also vice-president of the Legislation Committee of the American Chamber of Commerce (Amcham).
Ariane is a professor of Tax Law at the Centro Universitário de Brasília (UniCEUB), the founder and coordinator of the Group of Studies and Research in Tax Law (Gepat), as well as the founder of ‘Elas Pedem Vista’, a group that discusses current issues related to women in power. She is also a member of the firm’s Pro Bono Committee.
Centro Universitário de Brasília (UniCEUB)
Bachelor of Laws
Centro Universitário de Brasília (UniCEUB);
Master in Tax Law
Centro Universitário de Brasília (UniCEUB)
Doctorate in Tax Law
Georgetown University, USA
Visiting Researcher
Provided by Chambers
Ariane Costa Guimarães is renowned for her in-depth knowledge of tax-related disputes and is also notably skilled at being an amicus curiae.
Provided by Chambers
Ariane is very technical and responsive. Excellent lawyer.
She is simply an incredible professional. She has high technical capacity and reinforces a solid culture and ethical values.
Ariane is very technical and responsive. Excellent lawyer.
She is simply an incredible professional. She has high technical capacity and reinforces a solid culture and ethical values.
