Fines, Digital Seals, and Materiality: The New Map of Tax Risks

Tax enforcement in Mexico is entering a stricter, more digital, and more preventive stage. During the first half of the year, revenue from tax fines grew more than 100% compared to the same period the previous year, according to official figures. The data confirms a significant shift in how the Tax Administration Service (SAT) reviews, detects, and penalizes possible noncompliance.

This scenario is not an isolated event. In recent years, reforms to the Federal Tax Code have expanded the authority's powers and strengthened mechanisms such as the temporary restriction and cancellation of Digital Seal Certificates (CSD). At the same time, the SAT now has greater technological capabilities, more robust databases, and analysis tools built on the evolution of electronic accounting, CFDI invoices, and other tax information schemes.

Against this backdrop, companies need to understand that enforcement no longer relies solely on traditional audits. Today, the authority can identify inconsistencies from data, cross-referenced information, and digital validations across multiple fronts, from foreign trade to reviews of tax domicile, refunds, CFDI invoices, and proof of materiality. This requires taxpayers to review their processes with a preventive, documentary, and strategic mindset.

Tax Domicile and RFC Operational Risks

The adoption of virtual offices, shared spaces, and flexible work models has created new risks for taxpayers. While these arrangements can be useful for entrepreneurs, SMEs, and companies with leaner structures, they can also cause problems during tax domicile verifications.

In practice, if SAT inspectors visit a shared address and reception staff cannot immediately identify the taxpayer, the authority may presume that the tax domicile does not exist or is invalid. This situation can trigger significant proceedings, including the cancellation of digital seals, with direct effects on the company's business operations.

The problem is that a failure to locate a taxpayer does not necessarily mean the company does not exist or that its operations are simulated. The Federal Tax Code recognizes the right to a hearing and allows taxpayers to clarify their situation. To do so properly, it is essential to act quickly and rely on specialized advice, both accounting and legal.

At this point, prevention is also operational. Companies should make sure their tax domicile, office contracts, receipts, and contact channels are up to date and can hold up under a verification.

Refunds, Materiality, and Documentary Burden

The rise in tax fines coincides with another relevant phenomenon for companies: a 12% decline in tax refunds authorized by the SAT during the same period. Both elements reflect a growing demand for documentation and support to prove that transactions actually took place.

Materiality has become a central criterion in the relationship between taxpayers and the authority. Today, having an invoice or an accounting record is not enough. Companies must be able to demonstrate that a service was rendered, that a good was delivered, that deliverables existed, and that the transaction had a verifiable business purpose.

The main challenge arises when the authority requests evidence of transactions carried out years earlier. Reconstructing documents, communications, reports, deliverables, or proof of performance can be costly, complex, and even impossible if they were not compiled from the moment the transaction occurred.

That is why materiality must be documented in real time. Every contract, purchase order, deliverable, proof of payment, email, minutes, report, or operational record can become a decisive element when facing an audit or a refund request.

A Preventive Culture in the Face of a Digitalized SAT

The new tax environment requires companies to move away from a reactive stance. The question is no longer whether the authority will review a transaction, but when it might do so and how much information it will have to challenge it.

Generally speaking, the SAT has a five-year window to exercise its auditing powers. This means that the documentation decisions a company makes today can affect future audits.

The recommendation is to move toward a preventive culture of documentation, internal controls, and periodic review of tax risks. Well-organized records make it possible to respond with greater order, speed, and certainty to any information request.

In the face of active, digitalized enforcement, the best defense is anticipation. Companies that consistently document their operations, keep their processes up to date, and work with specialized advisors will be better prepared to protect their business continuity and reduce contingencies.

SAT enforcement will continue to rely on increasingly precise technology, information, and analytical capabilities. For organizations, the challenge is to respond with more orderly processes, sufficient documentary evidence, and a preventive strategy that accompanies their operations from the start.