Ariane Costa Guimarães

Practice Areas

Tax; Government Relations; Mattos Filho 100% Pro Bono

Career

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.

Education