Guilherme Chambarelli is a lawyer with a strategic practice in Business Law, dedicated especially to the legal challenges of the Financial and Capital Markets, the Digital Economy and the Governance of Family Businesses.
A specialist in Corporate and Tax Law, his work is guided by the structuring of complex transactions — such as corporate reorganizations, investment rounds and efficient tax planning — always focused on strengthening the companies he advises and ensuring their longevity.
Guilherme advises everyone from large multinational companies and publicly held corporations to early-stage startups, family businesses and ventures taking their first steps. Regardless of size or maturity, his work aims to provide legal certainty and strategic clarity, helping each business grow in a structured and sustainable way.
A professor at Ibmec and Fundação Getulio Vargas, and a mentor at Distrito for Startups, he shares his experience with new generations of entrepreneurs and jurists, helping to develop a more robust, ethical and conscious innovation ecosystem.
In addition to his work as a lawyer, Guilherme is also an entrepreneur. Founder of TaxLab University and Legal Dept., he lives first-hand the challenges of getting ideas off the ground, managing teams, dealing with uncertainty and making decisions in risky scenarios. This experience on both sides — legal and business — sharpens his listening, refines his strategic vision and makes him even more attuned to the real pain points of entrepreneurs.
With a career that combines academic excellence and hands-on experience in Corporate Law, Guilherme Chambarelli represents a profile of legal leadership that inspires confidence, translates complexity and anticipates solutions — always alongside those who build the new.
Education
Postgraduate degree (LL.M.) in Tax Law from Fundação Getúlio Vargas; Postgraduate degree in Customs Law from Universidade Cândido Mendes; Advanced Course in Tax Case Law (Curso PJT) from the Brazilian Financial Law Association (ABDF) and the Tax Debate Group (GDT); Law degree from Universidade Estácio de Sá.
Track Record
Advised on the formation of a fintech focused on international investments, including corporate structuring and foreign exchange aspects.
Provided tax advice to a fuel distributor on the social security levy on bonus payments.
Advised on opening correspondent accounts with Russian financial institutions, enabling the foreign trade activities of a Brazilian company.
Advised on a structured credit transaction with a national açaí producer, focusing on guarantees and contract design.
Supported a food wholesaler in the recovery of tax credits, focusing on financial recomposition.
Assisted a textile manufacturer in reviewing payroll charges, identifying opportunities to reduce labor and social security costs.
Supported an executive education company in obtaining a tax incentive.
Developed a tax restructuring strategy for an energy company, aimed at mitigating undue charges.
Led the tax restructuring of an athlete intermediation and agency company, resulting in tax savings of approximately 35%.
Developed tax planning for a hotel group operating in Rio de Janeiro, aligning legal and operational strategies.
Advised on setting up the Brazilian subsidiary of a Bulgarian company specialized in developing online casinos.
Advised an Isle of Man-based company specialized in developing online casinos.
Supported the opening of a branch in Brazil for an international athlete agency group, ensuring legal compliance and speed in the process.
Structured the Brazilian subsidiary of an Austrian geointelligence and artificial intelligence startup.
Advised an Israeli jewelry company on its entry into the Brazilian market.
Structured the Brazilian operation of an Australian startup specialized in rewards programs.
Provided legal advice on an investment round in a startup focused on training actors and performing arts professionals.
Structured the formation of a marketplace offering products, services and digital influencer agency.
Coordinated the incorporation of a Brazilian subsidiary belonging to a South Korean state-owned energy company.
Provided legal advice to a healthcare financing fintech in its legalization and regulatory compliance process.
Assisted in the creation and regularization of tokens issued by a fintech and crypto-asset exchange, ensuring compliance with applicable legislation.
Prepared a tax restructuring plan for a family group owning several buildings, focusing on reducing IPTU (municipal property tax).
Supported a hospital in negotiating and reducing tax liabilities and civil debts, contributing to the institution’s financial rebalancing.
Advised a nationally renowned singer on obtaining a specific tax benefit, contributing to the efficient structuring of income and asset protection.
Guided Brazilian coaches working abroad through tax exit processes, ensuring compliance with Brazilian legislation and mitigating double taxation risks.
Complementary Courses
Corporate Reorganizations and Taxation from the Brazilian Financial Law Association (ABDF); Tax Planning from Ibmec; Law for Startups from StartSe; Contract Law: From Trust to Promise to Contract from Harvard Law School; ESG in Practice from Future Law.
Professional Experience
Legal Director at the Rio de Janeiro Startup Association (Associação Carioca de Startups); Partner at Legal Dept. Academy; Partner at TaxLab University; Partner at Academia Fiscal; Legal Director at Apex Bank; Head of Tax at TR3 Bank; Mentor at Distrito for Startups; Director of the Tax Debate Group (GDT).
Academic Experience
Coordinator of the Startup Taxation Course at TaxLab University; Coordinator of the Tax Procedure 4.0 Course at TaxLab University; Professor in the LL.M. in Law and Technology and the LL.M. in Corporate Law at Ibmec; Professor in the LL.M. in Corporate Law and Capital Markets at Fundação Getúlio Vargas; Professor in the Corporate Practice and Succession and Estate Planning Course at the Bar Association’s Law School (ESA-OAB/RJ); Professor in the Tax Case Law Course at the Bar Association’s Law School (ESA-OAB/RJ); Professor in the MBA in Tax Planning at Universidade Cândido Mendes; Contributor to the Electronic Journal of the PJT – Tax Case Law Project; Researcher and Academic Author in Tax Law at Fundação Getúlio Vargas.
Awards and Recognition
ITR World Tax Brazil – General Corporate Tax
The Best Lawyers in Brazil – Tax Law
Publications
Author of the book “Arquitetura Jurídica para Empresas” (Legal Architecture for Companies), Editora Lumen Juris (2026); Co-author of the book “Prática Tributária nos Tribunais Superiores”, Editora RT (2024); Co-author of the book “Direito, Economia e Filosofia”, Editora Foco (2023); Co-author of the book “Tributação na Sociedade Moderna”, vol. III, Arraes Editores (2021); Co-author of the book “Teses Tributárias: Uma Análise das Jurisprudências dos Tribunais Superiores”, Editora Lumen Juris (2020); Organizer and co-author of the book “Temas de Processo Tributário”, Editora Lumen Juris (2019); Co-author of the book “Análise Jurisprudencial de Teses Relevantes em Direito Tributário”, Editora Lumen Juris (2019); Co-author of the book “Direito Aduaneiro”, Editora Ágora (2019); Co-author of the book “Coletânea de Direito Aduaneiro”, Editora IOB (2016); Author of several articles in online journals.
Memberships
Member of the Brazilian Financial Law Association (ABDF); Member of the Tax Debate Group (GDT); Member of the Financial and Tax Law Committee of the Institute of Brazilian Lawyers (IAB); Member of the Digital Law Committee of the Institute of Brazilian Lawyers (IAB).
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