Tax control guide for companies in Mexico

Tax compliance requires coordination among accounting records, invoices, returns and documentary evidence. Specific requirements depend on the relevant regime, transactions and period.

Areas worth reviewing

Every company incorporated in Mexico must comply with a set of obligations before the Tax Administration Service (SAT). The most relevant include:

Monthly and annual returns. Legal entities must file VAT and income tax returns monthly, plus an annual return within the first three months of the following fiscal year. Non-compliance generates surcharges and updates that can represent significant costs.

CFDI 4.0. Since 2023, the Digital Tax Invoice version 4.0 is mandatory for all operations. This version incorporates new fields such as the CFDI use by the recipient and validation of the tax regime of both issuer and recipient. Errors in stamping can result in non-deductible expenses.

Informative declaration of operations with third parties (DIOT). Monthly, companies must report their operations with domestic and foreign suppliers. Omission or inconsistency in this declaration is one of the main causes of SAT requirements.

Internal review and prevention

An internal review may help identify differences, document assumptions and prioritize matters requiring professional validation. Any correction or supplementary return should be evaluated for the specific case.

Technology can support reconciliations and pattern detection, but outputs require human validation and do not constitute a diagnosis on their own.

Control practices

Maintain an organized digital file of all issued and received CFDIs. Monthly reconcile accounting records with filed returns. Review the correct classification of income and deductions according to the tax regime. Have a specialist who monitors changes in tax legislation, which in Mexico are frequent and relevant.

Tax compliance is not just a legal obligation: it is a competitiveness and trust factor for partners, investors and clients.