A SAT audit is not an indication of wrongdoing. It is an administrative procedure that any Mexican taxpayer can face, and foreign-owned corporations in Mexico are frequent targets because cross-border transactions\u2014intercompany loans, royalties, management fees, and dividend distributions\u2014attract SAT scrutiny by their nature. The outcome of an audit depends less on the original tax position than on how the company responds: the quality of documentation provided, the procedural choices made, and whether legal counsel is involved from the start.<\/p>\n\n\n\n
Related issues may require complementary legal analysis, depending on the transaction and operating structure.<\/p>\n\n\n\n
The desk audit is the most common audit type for foreign-owned corporations. SAT issues a formal requirement (requerimiento) requesting documents and information\u2014typically CFDI records, bank statements, tax returns, and financial statements\u2014within a specified deadline.<\/p>\n\n\n\n
The desk audit is conducted remotely. SAT auditors analyze the submitted materials and compare them against the CFDI information in SAT’s own systems, banking information obtained from CNBV, and customs data. CFDI reconciliation errors, unexplained bank credits, and discrepancies between income reported and deposits received are the primary triggers for follow-up requirements or formal assessments.<\/p>\n\n\n\n
Response timelines are strict. A company that receives a requerimiento has a legally defined period to respond\u2014typically 15-20 working days, with limited extensions. Failing to respond within the deadline allows SAT to proceed with a presumptive assessment based on the information it has.<\/p>\n\n\n\n
The field audit authorizes SAT auditors to physically visit the company’s registered address, inspect books and records, interview employees, and request documents. The auditors must present an audit order (orden de visita) identifying the taxpayer, the tax periods covered, and the specific taxes under review.<\/p>\n\n\n\n
The field audit is governed by CFF Art. 46-A, which caps its duration at 12 months from the date the auditors present the order. This 18-month cap for large taxpayers (contribuyentes grandes) is enforced, meaning SAT must conclude the audit within that period or the legal basis for the audit expires.<\/p>\n\n\n\n
During the field audit, companies have the right to designate legal representation, to have counsel present during all interactions with auditors, and to respond to preliminary findings (acta final de visita) before a formal assessment is issued.<\/p>\n\n\n\n
The electronic review is the newest and fastest-expanding audit modality. SAT initiates it based entirely on digital information\u2014CFDI records from all Mexican taxpayers in the company’s supply chain, banking information, and third-party filings\u2014without any physical document request.<\/p>\n\n\n\n
SAT generates a pre-liquidation (preliquidaci\u00f3n) identifying the specific discrepancy it believes it has found and gives the company 15 working days to either accept the discrepancy and pay or contest it. Electronic reviews are faster than traditional audits and are typically focused on a specific, narrow issue: an unmatched CFDI deduction, a specific intercompany transaction, or a LIVA refund claim SAT wants to verify.<\/p>\n\n\n\n
Mexico’s CFF and the Carta de los Derechos del Contribuyente establish clear procedural rights for companies under audit:<\/p>\n\n\n\n
Foreign-owned corporations are audited with a focus on cross-border transactions:<\/p>\n\n\n\n
The acuerdo conclusivo procedure (CFF Art. 69-C) is one of the most powerful tools available to a taxpayer under audit. It allows the taxpayer to negotiate the disputed tax position directly with SAT through PRODECON as a mediator before a formal assessment is issued.<\/p>\n\n\n\n
The critical feature of the acuerdo conclusivo: the first time a taxpayer uses it, 100% of penalties are waived.<\/strong> Only the base tax and surcharges remain. For a transfer pricing adjustment or a large CFDI dispute where penalties would be 55-75% of the omitted tax, this reduction is financially transformative.<\/p>\n\n\n\n To qualify, the company must file the acuerdo conclusivo request while the audit is still open\u2014after the preliminary findings are communicated but before the final assessment. Once an assessment is issued, the procedure is no longer available.<\/p>\n\n\n\n PRODECON facilitates meetings between SAT and the taxpayer, provides independent technical opinions on disputed issues, and produces an agreement document that resolves the audit. SAT is not obligated to accept the taxpayer’s position, but in practice, agreed-upon resolutions are common on factual disputes.<\/p>\n\n\n\n The strategic question in every audit is when to cooperate and provide additional information versus when to withhold and preserve positions for litigation.<\/p>\n\n\n\n Voluntarily providing information beyond what the SAT specifically requested can open new audit issues. On the other hand, refusing to provide clearly requested documents increases the risk of a presumptive assessment based on incomplete information.<\/p>\n\n\n\n The optimal approach:<\/p>\n\n\n\n Broaden the analysis with our guide to tax optimization for Mexican businesses<\/a>.<\/p>\n\n\n\n Prepare for the next stage with tax consulting within a business context in Mexico<\/a>.<\/p>\n\n\n\n Explore the related legal considerations in legal strategies for fiscal dispute resolution with the SAT<\/a>.<\/p>\n\n\n\nStrategic choices during an audit<\/strong><\/h2>\n\n\n\n
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Continue your legal review<\/strong><\/h2>\n\n\n\n
Frequently asked questions<\/strong><\/h2>\n\n\n\n