In recent years, Mexican tax authorities have intensified scrutiny on transactions involving Mexican companies, especially regarding the “materiality” of service expenses. Recent regulatory changes and court rulings highlight the need for multinational corporations with Mexican subsidiaries to diligently document the reality and substance of service expenses, ensuring compliance and preventing potential tax audits and penalties.
Understanding “Materiality” in Mexican Taxation
Historically, Mexican tax authorities introduced Article 69-B to the Federal Tax Code in 2014 to combat fake tax invoices linked to nonexistent operations. While initially targeting explicitly fraudulent practices, the tax authorities’ focus has since broadened significantly. Today, virtually all service transactions, particularly between related parties, undergo rigorous examination to verify their authenticity, or “materiality.” Failure to convincingly document these transactions can result in denied tax deductions, creating substantial financial risks for businesses operating in Mexico.
Key Regulatory Changes: Criterion 44/ISR/NV
A major shift occurred in October 2024, when Mexico’s tax administration introduced the non-binding administrative criterion 44/ISR/NV. This criterion specifies that for a service expense—whether domestic or cross-border—to be deductible, businesses must provide explicit and thorough evidence that services were delivered, not just invoiced or contracted.
Although classified as non-binding for taxpayers, this criterion is mandatory for tax authorities. Thus, without proper documentation, companies may face denial of deductions or tax refunds during audits or examinations. This new administrative requirement has widespread implications, as auditors are now obligated to verify the materiality of each deducted service, further increasing the documentation burden on taxpayers.
Documenting Materiality: Ambiguity and Judicial Insights
A significant challenge arises from Mexico’s lack of statutory definitions or comprehensive administrative guidance on what precisely constitutes sufficient evidence of materiality. This absence leaves taxpayers grappling with uncertainty, particularly since tax authorities may request highly specific documentation years after a transaction.
Nevertheless, recent judicial decisions offer valuable guidance. Mexican courts have clarified that mere invoices, payment records, or contractual agreements typically do not suffice as evidence of materiality. Instead, effective documentation often includes comprehensive evidence, such as service proposals, detailed agreements, credentials of service providers, deliverables like reports or software, time sheets, project timelines, and even visual documentation such as photos or videos of the provided service.
Courts have emphasized reasonableness, explicitly ruling against excessive or irrational demands by tax authorities. Consequently, taxpayers should adopt a pragmatic approach, aligning documentation efforts with the nature and complexity of the service transactions in question.
A US Perspective: Addressing Cross-Border Complications
From the viewpoint of US multinationals, Mexican audits focused on materiality can resemble transfer pricing disputes, though authorities often approach them differently. Despite this overlap, accessing mutual agreement procedures (MAP) under the US-Mexico tax treaty remains complicated, with inconsistent acceptance by Mexican authorities.
US taxpayers must be proactive, filing protective treaty notifications early—ideally before adjustments seem likely—to preserve the right to pursue MAP relief. Annual updates of these notifications are also recommended. However, given procedural complexities and uncertainties surrounding the Mexican competent authority’s stance, bilateral Advance Pricing Agreements (APAs) have become an increasingly attractive option, offering clarity on pricing and deductibility issues upfront.
Practical Steps for Companies Operating in Mexico
To effectively navigate these challenges, companies should consider adopting the following best practices:
- Proactive Documentation: Develop comprehensive and customized evidence files immediately upon completion of service transactions.
- Technology Utilization: Leverage digital tools beyond standard accounting systems to streamline document retention and accessibility, mitigating risks associated with personnel turnover.
- Cross-functional Collaboration: Engage tax departments more deeply in operational decisions, including procurement, vendor evaluations, and contract management.
- Advance Pricing Agreements: Seek bilateral APAs to secure upfront agreement on service expense deductibility and transfer pricing considerations.
Conclusion
With increasing regulatory rigor and evolving judicial interpretations around service transaction deductions in Mexico, multinational corporations must prioritize meticulous documentation of “materiality.” While uncertainties persist, proactive strategies, judicial insights, and bilateral agreements represent essential tools for maintaining compliance and mitigating risk in Mexico’s complex tax environment.
This article is adapted from insights provided by Roberto Cardona Zapata, Mark Martin, Thomas Bettge, and Michel Sánchez O’Sullivan, specialists at KPMG, originally published by Bloomberg Tax.
