# Is my fleet's fuel deductible? SAT rules for 2026

> The four LISR conditions for deducting fleet fuel in 2026: authorized payment method, valid CFDI, strict business necessity and correct accounting records.

**Author:** Rodrigo Vázquez — Mexican Tax Specialist (SAT, CFDI)  
**Reviewed by:** Marina Costa — Brazilian Tax & Compliance Specialist  
**Published:** 2026-07-14  
**Updated:** 2026-07-14  
**Last reviewed:** 2026-07-14  
**URL:** https://quilometragem.com/blog/is-my-fleets-fuel-deductible-sat-rules-for-2026

**TL;DR:** Fleet fuel is 100% deductible in Mexico if four conditions hold: authorized payment, per-fill CFDI, business necessity and archived XMLs.

- Cash kills the deduction with no minimum threshold, even MXN 600.
- Each fill-up's CFDI needs the RFC, liters and itemized VAT.
- The mileage logbook defends the consumption-to-activity ratio.
- An XML missing from accounting equals a nonexistent invoice.

## Summary

Fleet fuel in Mexico is 100% deductible if four LISR conditions hold: payment through an authorized method (never cash, no minimum threshold — Art. 27 section III), a valid CFDI per fill-up, documented business necessity with a mileage logbook, and accounting records with archived XMLs. The authorized wallet satisfies the first two by design.

## Frequently asked questions

### Is there a minimum amount below which I can pay for fuel in cash?

No. Art. 27, section III of the LISR requires an authorized payment method even below MXN 2,000. It is the only expense category with no cash threshold.

### What should I document for strict business necessity?

A per-unit mileage logbook, assigned routes and the consumption-to-activity ratio. Build it before the SAT asks.

## Sources

- [Ley del Impuesto sobre la Renta — Art. 27, fracciones I y III](https://www.diputados.gob.mx/LeyesBiblio/pdf/LISR.pdf) — Cámara de Diputados (2026-07-08)
- [Ley del Impuesto al Valor Agregado — Art. 5 (acreditamiento)](https://www.diputados.gob.mx/LeyesBiblio/pdf/LIVA.pdf) — Cámara de Diputados (2026-07-08)
- [Código Fiscal de la Federación — Art. 28 (contabilidad electrónica)](https://www.diputados.gob.mx/LeyesBiblio/pdf/CFF.pdf) — Cámara de Diputados (2026-07-08)