Since 2020, the Congress of Mexico City approved updates to the rates for the Property Acquisition Tax in Mexico City, also known as the Real Estate Acquisition Tax (ISAI, per its acronym in Spanish), which has led various judicial bodies to rule on its constitutionality. These bodies have declared that the ISAI rate update is unconstitutional, arguing that it lacks progressivity.
A key issue is the inconsistency in the criteria used to determine the effects of injunctions granted by these judicial bodies. Throughout the years, some resolutions have resulted in the complete exoneration of the ISAI, while others have mandated partial or full payment of the tax, resulting in conflicting outcomes. On May 16, 2024, the Collegiate Circuit Court (Pleno Regional en Materias Administrativas y Civil de la Región Centro-Norte de la Ciudad de México) issued a rresolution to resolve this discrepancy regarding ISAI criteria for the 2021 and 2022 fiscal years. In this resolution, the court determined that appeals (amparos) granted should result in complete exemption from ISAI for the appellant, aiming to prevent further controversy. This rresolution is relevant for the current year and for pending appeals, as the lack of progressivity in ISAI determination persists. In addition, this resolution establishes mandatory case law for Mexico City judicial bodies.
Our team of experts is available to address any questions or comments you may have on Property Acquisition in Mexico City.
Interested in industrial Poles in the Mexican State of Yucatán? Read our Tax Alert on Welfare Industrial Poles Decree (Progreso I and Merida I).
Subscribe to our bulletin to stay updated on all tax matters in Mexico
A&M Benefits Reference Guide
December 11, 2025
Many of the limits that pertain to qualified retirement plans and benefit plans are set by the Internal Revenue Service (IRS) and are subject to cost-of-living adjustments. In 2026, employees will be able to increase their retirement savings and contributions to health savings accounts as a result of the increased limits. The IRS limits for 2026 are summarized in the table below along with certain important compliance deadlines.
Pharma in Focus: A Prescription for Thai Tax & Tariff Health
December 8, 2025
Alvarez & Marsal recently hosted an engaging and practical session tailored for tax, finance, and trade professionals in the pharmaceutical industry. This first edition of our Thailand Tax Talk: Industry Series explored how tax leaders in the pharma sector can respond to increasing regulatory pressure, operational complexity, and cross-border trade disruption.
Supreme Court Upholds Delhi High Court Ruling: Indian Subsidiary Does Not Automatically Constitute PE, and No Further Profit Attribution Is Warranted Once the Subsidiary Arm’s Length Remuneration Is Paid
December 5, 2025
The Supreme Court’s affirmation of the Delhi High Court ruling in the Progress Rail case provides important clarity on Permanent Establishment standards in India.
The decision reinforces key principles on control, core functions, agency thresholds, and profit attribution.
It further underscores that arm’s-length remuneration to Indian subsidiaries precludes additional attribution.
A significant development for multinational enterprises evaluating their India-linked operating models.
OBBBA and Qualified Small Business Stock: Bigger, Faster, Broader Section 1202 Benefits for PE, VC and Founders
December 4, 2025
Discover how the One Big Beautiful Bill Act (OBBBA) modernizes Section 1202 QSBS, offering earlier exclusions, higher caps, and broader eligibility for PE, VC, and founders.