Matheus Monteiro Morosini

Matheus Monteiro Morosini is a partner in the Tax practice at Martinelli Advogados, specialising in strategic tax litigation and complex tax advisory matters. With more than 20 years of experience, he advises Brazilian and multinational companies on high-value tax controversies, tax risk management and sophisticated disputes before administrative and judicial courts.

His practice encompasses federal, state and municipal taxes, social security contributions, tax audits, administrative proceedings before CARF and other tax authorities, judicial litigation and strategic advisory on tax governance. He is particularly recognised for structuring legal strategies aimed at mitigating tax exposure, preserving business continuity and enhancing legal certainty in highly complex matters.

Matheus also advises clients on the practical implications of Brazil's tax reform, assisting companies in adapting governance structures and managing tax risks arising from an evolving regulatory framework.

Partner – Martinelli Advogados (2026 – Present)

Advises domestic and multinational companies on strategic tax litigation, tax controversy and complex advisory matters involving significant financial exposure.

Leads sophisticated tax disputes, judicial and administrative proceedings, tax governance projects and multidisciplinary teams focused on tax risk mitigation.

Partner – Prolik Advogados (2006–2026)

Developed an extensive practice representing major corporations in tax litigation and advisory matters over two decades.

Tax Attorney – Prolik Advogados (2005–2006)

Intern – Prolik Advogados (2001–2004)

Vice President – Paraná Institute of Tax Law (IDT/PR)

Member – Tax Law Committee, Brazilian Bar Association – Paraná Chapter (OAB/PR)

Member – Tax Affairs Council, Federação das Indústrias do Estado do Paraná (FIEP)

Articles on Tax Litigation and Tax Reform

Publications regarding tax governance and tax controversy

Contributions to academic and professional discussions on administrative tax litigation

Advises leading Brazilian and multinational companies operating in manufacturing, agribusiness, energy, retail, logistics, financial services and technology.

Matheus is recognised for combining deep technical expertise with strong institutional engagement and a practical, business-oriented approach. In addition to his legal practice, he plays an active role in the development of Brazilian tax law through leadership positions at the Paraná Institute of Tax Law (IDT/PR), participation in professional organisations and academic activities.

Clients value his ability to develop sophisticated legal strategies that balance technical excellence with commercial objectives, particularly in matters involving significant financial exposure and regulatory complexity.

Advises leading Brazilian and multinational companies on complex tax litigation involving federal, state and municipal taxes.

Represents clients before CARF, tax authorities and courts in high-value tax controversies.

Structures sophisticated tax risk management strategies and tax governance frameworks.

Assists companies in navigating the practical implications of Brazil's tax reform.

Advises clients on strategic disputes involving indirect taxes, social security contributions and regulatory matters.

More than 20 years of experience advising Brazilian and multinational companies on sophisticated tax litigation and strategic tax advisory matters.

Regularly represents clients before administrative tribunals, including CARF, tax authorities and the Judiciary in disputes involving complex tax assessments and high-value financial exposure.

Provides strategic advice on tax governance, tax risk mitigation, corporate reorganisations, indirect taxes and social security matters, supporting clients in making business-critical decisions.

Actively advises companies on the implementation of legal strategies arising from Brazil's tax reform and evolving tax regulations.

Academia Brasileira de Direito Constitucional (ABDCONST)

Postgraduate Degree in Tax Law

Pontifícia Universidade Católica do Paraná (PUC-PR)

LL.B.