# A SAT fuel audit: anatomy of a rejected deduction

> An illustrative SAT electronic review of fuel spend: how cash-paid and CFDI-less deductions fall, what it costs, and the remediation plan.

**Author:** Rodrigo Vázquez — Mexican Tax Specialist (SAT, CFDI)  
**Reviewed by:** Marina Costa — Brazilian Tax & Compliance Specialist  
**Published:** 2026-07-16  
**Updated:** 2026-07-16  
**Last reviewed:** 2026-07-16  
**URL:** https://quilometragem.com/blog/a-sat-fuel-audit-anatomy-of-a-rejected-deduction

**TL;DR:** Anatomy of a SAT fuel audit: cash spend and CFDI-less fill-ups fall to electronic cross-checks, with VAT rejected and fines added.

- Electronic reviews cross deductions, CFDIs and volumetric data.
- Cash spend is fully rejected, with no threshold and no defense.
- Items with complete CFDI, XML and logbook passed unchallenged.
- The 90-day fix: wallet, XML archive and quarterly reconciliation.

## Summary

An illustrative SAT electronic review (CFF Art. 53-B) of fuel spend: cross-checking declared deductions against received CFDIs and volumetric controls kills cash-paid spend (LISR Art. 27) and undocumented fill-ups, with VAT rejected in cascade and 55-75% fines. A 90-day remediation plan: eliminate cash, rebuild the XML archive and harden logbooks.

## Frequently asked questions

### Does the SAT need to visit a company to reject fuel deductions?

No. Electronic reviews (CFF Art. 53-B) cross-check returns, CFDIs and volumetric controls without a field visit.

### Can I recover fuel invoices from closed fiscal years?

Generally no: station portals limit issuance to the current period. A CFDI not recovered in time is a lost deduction.

## Sources

- [Código Fiscal de la Federación — Arts. 53-B (revisiones electrónicas) y 76 y ss. (multas)](https://www.diputados.gob.mx/LeyesBiblio/pdf/CFF.pdf) — Cámara de Diputados (2026-07-08)
- [Ley del Impuesto sobre la Renta — Art. 27, fracción III](https://www.diputados.gob.mx/LeyesBiblio/pdf/LISR.pdf) — Cámara de Diputados (2026-07-08)