Tax advisory and planning
Transaction structuring, tax regime analysis and opinions supporting business decisions.
Rodrigues Ribas,
Weingärtner Welter
Attorneys at Law
Brazilian Bar Association — OAB/RS 16,998
Legal and business intelligence for companies, individuals and the non-profit sector.
The firm
A practice built on continuity and technical precision
A Brazilian boutique law firm based in Porto Alegre, focused on tax, corporate and non-profit law. Rodrigues Ribas, Weingärtner Welter is the result of more than a decade of practice, combining complementary expertise around a single objective: compliance, stability and legal agility in day-to-day operations.
Our practice is closely connected to business reality and attentive to the transformations reshaping the Brazilian tax environment — the ongoing Tax Reform, the digital economy and cash efficiency through tax assets. Both partners hold Master's degrees from PUCRS and are actively involved with the Foundation for Advanced Studies in Tax Law (FESDT). Our combined background includes teaching, agile methods, an Italian dual degree and internationally recognised research in taxation.
Practice areas
Eight areas, one integrated reading
Brazilian Tax Reform
Impact assessment, contract review, systems adaptation and transition planning.
Tax litigation and settlement
Administrative and judicial defence, tax settlement programmes and voluntary disclosure.
Corporate law
Incorporation, restructuring, shareholders' agreements and governance.
Wealth and succession planning
Holding structures, estate planning and asset protection.
Non-profit sector
Tax immunity, certifications and statutory compliance.
International taxation and the digital economy
Cross-border operations, double taxation treaties and digital services taxation.
Environmental taxation and carbon markets
Carbon credits, sustainable finance and taxation of the energy transition.
Partners
Corporate practice, academic depth
Juliana Rodrigues Ribas
Attorney at Law · OAB/RS 96,840
LL.M. and Ph.D. candidate at PUCRS. Professor of Tax Law. Coordinator of the Law and Economics of Taxation research line at GTAX/PUCRS. Member of FESDT and IBDT.
Isabela Weingärtner Welter
Attorney at Law · OAB/RS 128,883
LL.M. from PUCRS and Dottoressa Magistrale in Giurisprudenza from Università degli Studi di Parma, Italy. Young Researcher Award, 26th Global Conference on Environmental Taxation (2025). Member of FESDT and associate researcher at Rivista Diritto e Pratica Tributaria.