Tax mailbox notices stand even without the time the alert was sent
Electronic notification through the tax mailbox. It is not a legal requirement that the related record state the time at which the tax authority sent the electronic alert to the taxpayer.
Official heading (Spanish): NOTIFICACIÓN ELECTRÓNICA POR BUZÓN TRIBUTARIO. NO CONSTITUYE UN REQUISITO LEGAL QUE LA CONSTANCIA RELATIVA DEBA CONTENER LA HORA EN QUE LA AUTORIDAD HACENDARIA ENVIÓ EL AVISO ELECTRÓNICO RESPECTIVO A LA PERSONA CONTRIBUYENTE.
The ruling
Collegiate Circuit Courts disagreed on whether the tax mailbox notification record must show the time the alert was sent when the taxpayer does not open the document. The Regional Plenary Court held it is not a legal requirement, because the deadlines under articles 17-K and 134, section I, of the Federal Tax Code run by full days.
Our take
This closes a formal argument that had worked in some circuits. Going forward, a deemed tax mailbox notification stands on the date of the alert, and a taxpayer who does not open the mailbox is deemed notified on the fourth day. In practice, the risk lies in contact details: an outdated email or an alert no one reads means lost defense deadlines. Treat the tax mailbox as a critical channel, with assigned owners and daily review. Challenges to notifications should focus on whether the alert was actually sent to the registered contact.
What to do
- Update contact details registered in the tax mailbox and assign owners.
- Check the mailbox daily and keep a log of alerts received.
- When challenging, test whether the alert actually reached the registered contact, not the time.
Details
- Court
- Regional Plenary Courts
- Type
- Binding precedent (jurisprudencia)
- Identifier
- PR.A.C.CN. J/42 A (12a.)
- Digital registry
- 2032265
- Published
- June 12, 2026
- Area
- Tax litigation
- View official source ↗
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Schedule a conversationOther precedents in the same area
- Conagua: without prior alert, water-mailbox service is unlawful
- Poorly grounded delegation to report audit findings leads to remand, not annulment
- Nullity complaint by mail: no proof of exact hour when time compensation applies
- Garnishment via the tax mailbox is clearly defined and respects legal certainty
Prepared by Artegia for information only; not legal advice. Headings in English are unofficial translations. The official text is the one published in the Semanario Judicial de la Federación or the TFJA journal.