Mexico SAT tightens CFDI rules: invoices must prove real transactions
Mexico's tax authority now reviews not just CFDI format but whether the underlying business transaction actually occurred. Taxpayers must provide delivery proof, bank statements, and other evidence to support each invoice.
Mexico’s SAT is shifting CFDI audit focus from invoice format to transaction substance. A correctly issued CFDI alone is no longer enough; taxpayers must now prove the transaction was real and economically necessary, backed by delivery notes, bank records, and supporting evidence.
Mexico’s tax authority is tightening CFDI validation rules to require proof that invoiced transactions actually occurred, not just that the invoice was correctly formatted.
The SAT now reviews whether the underlying business transaction was real and had economic substance. A CFDI, contract, or accounting entry standing alone is insufficient. Taxpayers must provide supporting evidence to demonstrate the transaction took place.
What evidence the SAT expects
Acceptable proof includes:
- Delivery notes and proof of service
- Bank statements and payment flows
- Inventory movements and order records
- Photographs and transaction logs
- Supplier capacity assessment
- Business necessity of the expense
Audit readiness for retailers
For retail businesses, this is primarily an audit-readiness issue. Each CFDI should be linked to real business records such as orders, delivery notes, inventory movements, and bank records. If the transaction did not actually occur, the CFDI may be treated as false and produce no tax effects.
The shift means taxpayers can no longer rely on technical CFDI compliance alone. The SAT will examine whether suppliers had the capacity to deliver, whether the expense was necessary for the business, and whether payment actually flowed.