Brazil Guide 2026 : Brazil
Ranked Individual
Provided by Mattos Filho
Our work covers diverse aspects of taxation, providing efficient, personalized solutions to obtain the best possible outcomes.
Our expert team works in coordination with professionals from the firm’s other practice areas to meet highly complex tax demands from local and international clients.
Provided by Chambers
Mattos Filho maintains a market-leading tax disputes practice in Brasília, regularly acting on complex litigation before the STF and STJ. The law firm is recognised for its role in significant tax controversies involving ICMS, PIS/COFINS and corporate tax matters. The team is particularly active in cases with nationwide implications, including proceedings under the general repercussion system.
Provided by Chambers
Mattos Filho represented Instituto para Desenvolvimento do Varejo (IDV) in a dispute before the STF regarding ICMS-DIFAL collection on interstate sales to non-taxpayers, involving over BRL1 billion.
Provided by Chambers
You can speak with any partner at any time. Mattos Filho has a high level of technical expertise and a highly qualified team. Their structure allows issues to be effectively decentralised and encourages strong involvement and engagement from everyone.
Mattos Filho excels through its highly capable technical team and its mastery of the issues at hand. It also has a sharp understanding of higher court jurisprudence and the dynamics that influence both the courts and other legal players.
Mattos Filho has extensive knowledge of the business and tax issues that directly affect our operations. It has supported us in highly complex cases and is widely respected and recognised at the national level.
Mattos Filho's technical competence in the highly specialised areas of tax law is remarkable. Their command of the entire body of jurisprudence on the subject is evident, as is the ease with which they engage with the justices.
Provided by Chambers
Ariane Costa Guimarães is a highly regarded tax disputes practitioner with a strong track record before the higher courts. She is recognised for her role in complex and high-value litigation, including leading cases under the general repercussion system. Ariane regularly represents major companies and industry associations in matters with nationwide impact. Her work is particularly noted for its strategic approach and distinctive perspective on tax procedure and jurisprudence.
A highly qualified professional with in‑depth knowledge, Ariane Guimarães is also exceptionally up to date and highly attuned to the client’s needs and limitations.
Ariane is an excellent lawyer: intelligent, helpful and highly skilled.
Ariane Guimarães is an exceptional and highly qualified lawyer, combining outstanding technical ability with a strong human approach. She is a source of inspiration, encouraging those around her to perform at their best.
Tax: Brasília
Provided by Mattos Filho
Ariane Guimarães
View profile of Ariane Guimarães
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