Understand your current position
Understand your current situation and identify inconsistencies, risks and opportunities.
Smart Tax Law
Every business decisioncarries a tax impact.
I turn tax uncertainty into a clear roadmap: sharper decisions, smarter structures, and sustainable growth with confidence.
R$ 0+
million
in strategic tax impact generated
0+
clients
advised on complex structures
Sound familiar?
Your company may be paying more tax than necessary.
And every month without fixing it, the loss grows.
A common scenario
When the decision stalls,
the problem decides for you.
Without a clear picture of the tax cost of each path, expanding, importing or restructuring can create operational, fiscal and financial risk.
In practice terms, that often means:
01
Goods held at customs
operations at a standstill
02
Tax assessment
Tax authorities at your door
03
Tax enforcement proceedings
assets at risk
04
Cash outflows
with no oversight
When time works against you, clarity becomes your most valuable asset.
Is your business structure still operating
without a strategic perspective?
without tax predictability?
What you need is more than just an answer.
You need to:
See your savings potential
Compare your current scenario with an optimized one and uncover real savings opportunities.
Current
R$ ---
Potential
R$ ---
Get an action plan to move forward
Receive strategic guidance to reduce costs and take advantage of tax benefits with confidence.
All handled securely, confidentially and tailored to your business.
How I work
This is exactly where my work begins.
I do not focus solely on solving isolated legal issues.
I step in to:
Because good decisions don't come from guessing.
They come from clarity.
About
Expertise, strategy, and a
genuine connection.
Mariana Matias
It's a pleasure to meet you. I'm Mariana. I chose Tax Law because it is where the reality of business meets regulation and where good strategy determines who moves forward. My journey was shaped by a desire to navigate the complexities of the tax world, first for myself, and later for my clients.
I believe people who look for a tax lawyer aren't really after a tidy legal answer — they're after direction. Knowing what to do, in what order, with what risk. That's what I want to deliver in every conversation — not memorized statutes, but a clear path you can follow with confidence.
High-value tax counsel is built on more than the law. It is built on business intelligence.
FocusNational & International Tax Law
PracticeBrazil and abroad
LanguagesPortuguese · English · Spanish
Career Path
A journey built with purpose, continuous study and strategic practice.
Education
01
Law · International experience
Law degree and postgraduate studies at PUCPR, with a strong foundation in Tax Law and a focus on international matters developed through academic research groups and legal competitions.
- Competitor in the world's leading international trade law competitions, held in the United States (John H. Jackson Moot Court Competition)
- Coach of the PUCPR International Trade Law Study Group (GDCI) for the John H. Jackson Moot Court Competition
Start
02
Novos Talentos · Gaia Silva Gaede
Admission to the firm's renowned program shaped my technical foundation and practical view of business law. The journey was further shaped by a range of professional experiences.
- Novos Talentos Program · Gaia Silva Gaede
- International Law and Tax Advisory Practice · Martinelli Advogados
- International Tax Practice · Roveda & Marcelino Advogados
- Volunteer legal team lead · ONG A Ponte
International
03
International and Tax Law
Worked in Tax Advisory, with a focus on indirect taxation. Developed experience across multiple areas of International Law, including international experiences, gradually transitioning into the field of International Tax.
- Postgraduate degree in International Law · PUCPR
- Customs Law and International Trade Taxation · IBDT (2023)
- Women Inside Trade (WIT)
- WCSA · World Complexity Science Academy
Today
04
Master's & independent practice
Master's candidate in Economic Law and Development (PUCPR) with a Fundação Araucária research grant, building a practical legal experience combined with academic research.
- Master's in Economic Law and Development · PUCPR (Fundação Araucária grant)
- Law 14.754/2023 and offshore taxation · IBDF (2025)
- Member of the Paraná Institute of Tax Law (IDT/PR)
- Member of TaxPUC
- Participant in Mulheres no Tributário (Women in Tax)
- Member of the OAB/PR Committees on Tax Law, International Law, and Law & Economics
Education
01
Start
02
International
03
Today
04
Law · International experience
Law degree and postgraduate studies at PUCPR, with a strong foundation in Tax Law and a focus on international matters developed through academic research groups and legal competitions.
- Competitor in the world's leading international trade law competitions, held in the United States (John H. Jackson Moot Court Competition)
- Coach of the PUCPR International Trade Law Study Group (GDCI) for the John H. Jackson Moot Court Competition
Novos Talentos · Gaia Silva Gaede
Admission to the firm's renowned program shaped my technical foundation and practical view of business law. The journey was further shaped by a range of professional experiences.
- Novos Talentos Program · Gaia Silva Gaede
- International Law and Tax Advisory Practice · Martinelli Advogados
- International Tax Practice · Roveda & Marcelino Advogados
- Volunteer legal team lead · ONG A Ponte
International and Tax Law
Worked in Tax Advisory, with a focus on indirect taxation. Developed experience across multiple areas of International Law, including international experiences, gradually transitioning into the field of International Tax.
- Postgraduate degree in International Law · PUCPR
- Customs Law and International Trade Taxation · IBDT (2023)
- Women Inside Trade (WIT)
- WCSA · World Complexity Science Academy
Master's & independent practice
Master's candidate in Economic Law and Development (PUCPR) with a Fundação Araucária research grant, building a practical legal experience combined with academic research.
- Master's in Economic Law and Development · PUCPR (Fundação Araucária grant)
- Law 14.754/2023 and offshore taxation · IBDF (2025)
- Member of the Paraná Institute of Tax Law (IDT/PR)
- Member of TaxPUC
- Participant in Mulheres no Tributário (Women in Tax)
- Member of the OAB/PR Committees on Tax Law, International Law, and Law & Economics
Practice Areas
Where expertise drives results.
Each practice area reflects a real problem that businesses and business owners face. We don't offer generic solutions: we always start from the specific diagnosis of your business.
I also work with tax settlements, the impacts of the tax reform and offshore structuring.
What Sets Me Apart
How I work.
Technical depth
I go beyond the obvious answer. I look for what is best for the specific case, with clear grounds and consequences.
Systemic view
I anticipate risks and parallel issues. An effective solution, with no loose ends.
Strategic guidance
I organize the path from diagnosis to decision. The client moves from vulnerability to a position of control.
International network
I have partners across multiple international jurisdictions to enable the creation and maintenance of offshore structures, so you don't have to worry about that stage.
Ready for a no-commitment conversation?
A first consultation is enough to understand if it makes sense to work together.
Contact
The first step toward clarity.
The first conversation is meant to listen and understand your situation. At the end, I will tell you how I can help. You leave with direction, and not with more questions.
Response timeI reply to messages within 24 business hours. For urgent matters, WhatsApp is the fastest channel.
Service via videoconference throughout Brazil and abroad.