SAT tax assessment: decide what to pay and what to challenge by item
A resolution assessing tax debt calls for separate decisions on payment, challenges and security. Evidence of an earlier payment must be...
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SAT and IMSS notices: who should handle each case file
Two documents received by the same business may concern different authorities, periods and procedures. Separate evidence files help...
Lost your e.firma KEY file? How to choose your renewal route
Downloading a CER certificate does not recover the private KEY file. For an adult individual taxpayer, the renewal route depends on...
A problem with Mexico's SAT: clarification, a PRODECON complaint or legal defense?
The appropriate response to a SAT problem depends on the document and the right affected. Administrative clarification, a complaint and...
You received a Mexican tax diagnosis: turn findings into documented corrections
A useful tax diagnosis connects each finding to a period, document, difference and next action. Separate confirmed errors from missing...
Mexico Fuel Tax Deduction in 2026: Payment, CFDI, and a Vehicle-Level Audit Trail
A Mexican fuel deduction requires an authorized payment method from the first peso, valid CFDI evidence, a connected vehicle, and...
When Do You Need to Register With SAT? Mexico's 2026 RFC Map for Individuals
Mexico has separate moments for obtaining an RFC, activating an economic activity, and updating existing duties. This 2026 map shows...