The 2026 Tax Reform has introduced substantial changes to the tax interest guarantee scheme in Mexico. Although these provisions are general in nature, their impact on transfer pricing audits is direct and profound, transforming the way multinational groups must assess and manage the risks associated with possible adjustments arising from their transactions with related parties.
In a more rigorous tax environment, the guarantee of tax interest is no longer an administrative formality but has become a strategic factor that impacts companies’ liquidity and financial decision-making.
Tax Reform 2026: Relevant changes in guarantees
The reform strengthens the regulatory framework whereby taxpayers who decide to challenge tax credits must guarantee tax interest in order to suspend their enforcement. Previously, there were certain margins that allowed access to means of defense without immediate immobilization of resources; however, this margin has been significantly reduced.
Under the new legislation, the guarantee can be implemented through:
- Cash deposits.
- Bonds.
- Letters of credit.
- Other instruments provided for in current tax legislation.
The structural element of this change is that the guarantee becomes an indispensable element in avoiding collection actions while the defense procedure is ongoing, which requires a careful assessment of the financial implications of each mechanism.
Relevance of the new scheme in transfer pricing audits
The strengthening of the guarantee scheme takes on a critical dimension in the area of transfer pricing due to the technical and economic nature of these processes:
- Amount of adjustments: Tax credits in this area often involve significant sums, as they cover multiple fiscal years and recurring operations.
- Duration of disputes: Given the complexity of functional analyses and the need to conduct specialized tests, these processes tend to be considerably lengthy.
- Technical nature of adjustments: As they are based on judgments of comparability and economic assumptions, differences with the authority often lead to lengthy defense proceedings.
Practical implications for taxpayers with intercompany transactions
Under this new regulatory environment, taxpayers who engage in related-party transactions face additional challenges that require a comprehensive approach:
Greater emphasis on prevention The preparation of robust and consistent transfer pricing studies is consolidated as the first element of risk mitigation in the event of a possible audit and the determination of a tax credit.
Early assessment of scenarios In the face of a potential adjustment, it is key to analyze courses of action in advance (self-corrections, agreements with the authority, or litigation), considering not only the technical merits but also the financial impact of ensuring tax compliance.
Comprehensive tax and financial risk management Due to the effects on liquidity and debt indicators, close coordination between the tax, financial, and legal areas of the organization is essential.
Conclusion: A preventive and strategic approach
The changes introduced by the 2026 Tax Reform in terms of guaranteeing tax interests underscore the need to analyze disputes from a comprehensive perspective. In the case of transfer pricing, this environment makes it clear that decisions should not be evaluated solely on technical criteria, but also considering their financial and global risk management implications.
The proper evaluation of possible scenarios is now a fundamental part of the correct administration of intercompany operations and the mitigation of risks associated with their taxation.
TPC Group, as a specialized firm, advises its clients on the preventive analysis of their transfer pricing policies, enabling risk management aligned with the new tax guarantee and defense requirements in the context of the 2026 Reform.
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