In Mexico, the annual fiscal package has become a focal point for taxpayers and advisors, raising questions about the extent of tax supervision. For the fiscal year 2026, the direction seems straightforward: while no significant structural reforms are forthcoming, there will be a consolidation of a model prioritizing tighter controls and greater authority for tax authorities. This year's package underscores a determination to increase revenue without radically altering the fiscal architecture.

A central theme of the new provisions is the enhancement of oversight related to digital tax receipts. The Servicio de Administración Tributaria (SAT) will now have more specific and expedited verification powers to ascertain whether reported operations are genuine or fabricated. This shift means that 'materiality' has transitioned from a theoretical concept to a practical necessity, requiring businesses to demonstrate the economic substance behind every transaction, rather than merely presenting a contract as proof.

The implications of these changes are significant for businesses operating in Mexico as they will face more rigorous checks and will need to adapt to a compliance environment that values efficiency and accountability. This may result in increased administrative burdens but could also lead to a higher level of assurance for tax authorities regarding the legitimacy of transactions, thereby steadily contributing to improved tax collection efforts.