IX International Tax Law Congress of Rio de Janeiro draws nearly 3,000 registrations and pays tribute to Gustavo Brigagão

From 12 to 14 August 2026, the Sheraton Grand Rio Hotel & Resort hosted the IX International Tax Law Congress of Rio de Janeiro, organised by ABDF – IFA Brazil. Held in a hybrid format under the theme "Tax Reform in Motion: First Challenges of Implementation", the Congress drew nearly 3,000 registrations and 270 speakers, bringing together jurists, academics, public authorities and private practitioners.

Opening plenary

ABDF President Betina Treiger Grupenmacher opened the Congress and chaired the opening plenary, "Institutional Leaders", which brought together Adilson Rodrigues Pires, Ana Claudia Borges, André Gomes de Oliveira, Carolina Brasil, Clelio Chiesa, Denise Lucena Cavalcante, Gustavo Brigagão, Halley Henares, Luís Eduardo Schoueri, Marcelo Campos, Marcelo Magalhães Peixoto, Mariana Porto Koch, Mary Elbe Queiroz, Paulo Ayres Barreto, Tácio Lacerda Gama and Valter Lobato.

Tribute to Gustavo Brigagão

This edition paid tribute to Professor Gustavo Brigagão, ABDF President Emeritus, for his contribution to Brazilian tax law and his long-standing work with ABDF. The tribute took place on the main stage, alongside ABDF directors and guests, and was accompanied by the launch of a book in his honour.

Programme

Over three days, panels and plenary sessions addressed central issues in the implementation of the reform, including artificial intelligence in tax law, split payment and assisted tax assessment, the Selective Tax, and the taxation of payment methods and digital businesses. International panels discussed tax cooperation and competition between countries in the context of the OECD and the United Nations, as well as the future of Pillar Two.

The closing plenary brought together Ives Gandra da Silva Martins, Heleno Torres, Humberto Ávila, Agostinho Tavolaro, Justice Regina Helena Costa and Misabel de Abreu Machado Derzi.

WIN and ABDF Jovem

ABDF WIN | CEMT led the plenary session "Elas Debatem", with Rita Nolasco, Flavia Gaeta, Ana Carolina Monguilod, Danielle Brigagão, Bianca Xavier, Carla Tredici Christiano and Flávia Romano Rezende. The collective book "Novas Fronteiras da Tributação Brasileira", developed by ABDF WIN | CEMT, was also launched during the Congress.

ABDF Jovem | YIN IFA held a dedicated panel with Eduardo Barboza Muniz, Flávia Treiger Grupenmacher, Pedro Grillo, Luís Eduardo Maneira, Caroline Santos, João Pedro Nobre and Luciana Prates Caldas Cordeiro.

The Congress closed on the evening of 14 August with a party at the Gávea Golf Club for participants in the hybrid format.

Books launched at the Congress

• "Reforma Tributária em Homenagem a Gustavo Brigagão", vols. 1 and 2 (Arraes Editores), a collective work celebrating the career of Gustavo Brigagão, ABDF President Emeritus. Buy the book
• "Novas Fronteiras da Tributação Brasileira: Consumo, Renda, Contencioso e Cooperação Fiscal", a collective work by ABDF WIN | CEMT with 75 authors (NSM Editora). Buy the book

Photo highlights

ABDF WIN plenary participants, the closing plenary audience, the opening plenary, the authors of the ABDF WIN | CEMT collective book and Gustavo Brigagão at the launch of the book in his honour. Photos: Fernando Dantas/ABDF and Nilton Fukuda.

See all photos on Flickr →

ABDF thanks the speakers, participants, sponsors and supporters of this edition. The programme, speakers, photos and videos are available on the Congress website.