Clase 27/03/2026 - Silvina Coronello

Introduction to the Class

Overview of the Speaker

• The class is introduced by a speaker who presents Dr. Silvina Coronelo, an expert in tax law and a doctoral graduate from the University of Buenos Aires.

• Dr. Coronelo specializes in contemporary issues such as artificial intelligence and gender perspective, currently teaching applied artificial intelligence in taxation at UBA.

• She actively participates in conferences and has been appointed as a technical communicator for Argentina at international tax law events.

Key Principles in Tax Law

Focus on Legal Principles

• Dr. Coronelo emphasizes two critical principles: the principle of legal reserve and the principle of non-confiscation, dedicating time to each during the session.

• She expresses her preference for interactive discussions over presentations, encouraging participants to engage freely throughout the class.

Understanding Participants' Background

• The speaker checks if all attendees are lawyers or if there are accountants present, noting that different backgrounds may affect understanding of jurisprudence.

Review of Previous Topics

Recap of Prior Discussions

• Dr. Coronelo asks about previous topics covered, including principles within tax law related to reasonableness and taxpayer capacity.

• She mentions that there is always new material available for study due to ongoing developments in tax law.

Statute of the Taxpayer

Constitutional Norm Groups

• Discussion revolves around two main groups of constitutional norms: state powers regarding taxation and taxpayer rights which limit state power.

• The focus shifts towards analyzing taxpayer status, which includes principles that act as limits on state taxing authority.

Rights Within Taxpayer Status

Key Rights and Principles

• Important rights within taxpayer status include property rights, which relate directly to obligations imposed by taxes.

• Another significant principle discussed is legal reserve; it requires formal laws establishing taxes for constitutional validity.

Additional Principles Relevant to Taxation

Broader Contextual Principles

• Other relevant principles include equality, contributory capacity, equity, generality, due process rights related to fiscal claims.

• These principles also connect with judicial protection standards applicable within tax matters.

Current Focus: Principle of Legal Reserve

Definition and Importance

• The session aims to define what constitutes the principle of legal reserve concerning taxation requirements established by law.

Legislative Authority

Role of Legislative Bodies

• Emphasis is placed on legislative bodies being responsible for defining taxable subjects through democratic representation.

Essential Elements Defined by Law

Requirements for Valid Taxes

• Essential elements like taxable events must be clearly defined within laws prior to their enforcement according to legal reserve principles.

Subject Identification

Clarifying Taxable Subjects

• It’s crucial that laws specify who qualifies as taxpayers; ambiguity can lead to disputes regarding liability under tax regulations.

Exemptions from Taxation

Legislative Control Over Exemptions

• Exemptions must also be legislated; they cannot simply arise from executive decrees without proper statutory backing.

Overview of Regulatory Decrees and Constitutional Principles

Types of Decrees

• The discussion begins with the classification of regulatory decrees, including those by delegation and urgent necessity, emphasizing that none should modify existing laws.

• Articles 17 and 19 of the National Constitution are highlighted as foundational to understanding these principles, alongside limitations imposed on the executive by Articles 76 and 99(3).

Regulatory Decrees

• The first type discussed is regulatory decrees; Casas argues that a regulatory decree is unnecessary if it merely restates the law or exceeds its bounds, leading to potential unconstitutionality.

• The principle states that regulatory decrees cannot introduce new elements not established by law, reinforcing their limited purpose.

Delegated Decrees

• The second type involves delegated decrees where the executive acts under powers granted by legislation. Article 76 restricts such delegations concerning tax matters.

• Two court cases (Celcro and Camaronera Patagónica) are referenced to illustrate judicial interpretations regarding these types of decrees.

Urgent Necessity Decrees

Prohibition in Tax Matters

• Post-reform in '94, urgent necessity decrees are prohibited from being issued in tax matters according to Article 99(3).

• A historical case (Video Club Dreams) illustrates this prohibition where a decree extending taxes was declared unconstitutional due to violating the principle of legal reserve.

Implications for Taxation

• The case involved extending an existing tax on cinema tickets to video rentals without legislative backing, which was deemed unconstitutional.

Court Interpretations on Regulation

Recent Judicial Decisions

• A recent ruling (Piantonia Hermanos S.A.) examined whether regulations could alter the essence of laws governing bank transaction taxes.

• This case revealed how taxpayers circumvented taxes through banking maneuvers leading to expanded definitions within regulations.

Conceptual Clarity in Regulations

Definition Challenges

• The term "organized payment system" introduced by AFIP raised questions about its legality since it wasn't defined in original legislation.

Legal Precedents

• Previous rulings indicated that introducing concepts outside statutory language could violate legal reserve principles.

Supreme Court's Stance

Validation vs. Invalidity

• In Piantonia's case, the Supreme Court upheld AFIP’s definition as valid while dissenting opinions argued it exceeded lawful regulation limits.

Delegation Issues: Celcro Case Analysis

Legislative Parameters

• In Celcro's context, a lack of parameters for delegation led to a ruling against the constitutionality of empowering executives without clear guidelines.

Camaronera Patagónica Case Insights

Nature of Export Duties

• This case reaffirmed export duties' nature as tax-related issues requiring legislative authority rather than executive discretion.

Comparative Analysis with U.S. Rulings

International Context

• Discussion includes comparisons between Argentine rulings and recent U.S. decisions regarding delegation scope in taxation matters.

Conclusion on Regulatory Framework

Summary Points

• Emphasis on constitutional adherence for all forms of regulation and delegation within taxation frameworks remains critical for maintaining legal integrity.

The Nature of Tax Laws and Their Retroactivity

Understanding Tax Events

• The law must precede the taxable event, meaning it should not apply retroactively to events that occurred before its enactment.

• There are different types of taxable events: instantaneous (e.g., stamp tax) and periodic (e.g., income tax), each with distinct implications for retroactivity.

Instantaneous vs. Periodic Taxable Events

• Instantaneous events, like banking transactions, conclude immediately upon occurrence, leaving no room for retroactive application.

• In contrast, periodic events accumulate over time (like income tax), where some doctrines accept "improper retroactivity" if a law is enacted during the fiscal period it affects.

Improper Retroactivity in Practice

• An example includes laws that take effect mid-year but apply to the entire fiscal year; this can be valid if it impacts an ongoing taxable situation.

• Changes to minimum non-taxable amounts during an ongoing fiscal period illustrate how improper retroactivity can be applied without violating legal principles.

Jurisprudence on Retroactive Taxation

Accepting Retroactivity Under Certain Conditions

• Courts have accepted retroactive taxation when it serves as a safeguard against tax evasion or avoidance by taxpayers who might relocate their residency to escape taxes.

Recent Examples and Discussions

• During the pandemic, discussions arose around a solidarity contribution perceived as a new tax; debates ensued regarding its nature and legitimacy.

• Despite public figures questioning its classification as a tax, legal opinions maintained that its design inherently reflected its tributary nature.

Effects of Legislative News on Tax Compliance

Impact of Legislative Proposals

• The announcement of new taxes often leads to taxpayer flight; individuals may change their residency to avoid impending liabilities.

Legal Responses to Evasion Tactics

• Courts may allow certain forms of retroactivity as a means to prevent such evasive actions from becoming effective once news about potential taxes circulates.

Judicial Perspectives on Retroactive Legislation

Historical Context and Case Law

• The Supreme Court has historically ruled against excessive retroactive taxation based on cases like Juan Pedro Insúa (1987), which deemed such practices unconstitutional due to acquired rights through prior compliance.

Subsequent Reinforcement in Jurisprudence

• This principle was reiterated in later cases involving property revaluation where taxpayers had already fulfilled their obligations based on previous assessments.

Implications of Property Revaluation Cases

Specific Case Studies

• In Buenos Aires, property reevaluations led to demands for additional payments based on retrospective assessments despite prior compliance by taxpayers.

Court Rulings Against Retrospective Claims

• The court ruled that unless there was evidence of taxpayer wrongdoing or negligence, retrospective claims were unjustified given the administration's failure in timely updates.

Questions Surrounding Legal Certainty

Security in Taxation Laws

• Legal certainty is crucial for taxpayers; laws should provide clear guidelines without arbitrary changes that could disrupt financial planning and compliance expectations.

Balancing State Interests with Individual Rights

• While states possess taxing authority, they must respect established rights under existing laws; abrupt changes can undermine trust and stability within the economic system.