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Mexican tax compliance, explained with its legal basis.

Short guides for accountants, firms and companies in Mexico. Every rule, with the law or rule behind it.

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Buzón Tributario

Buzón Tributario: fines from January 2027 and how to enable it

From January 1, 2027, SAT can fine you $3,850 to $11,540 for not having the Buzón Tributario enabled. What it is, who must have it and how to activate it step by step.

2 min

In this post

  1. What is the Buzón Tributario?
  2. Who must have it?
  3. How to enable it step by step
  4. What if I already have it enabled?
  5. The hard part for a firm: checking dozens of mailboxes
  1. 2027 ReformTax changes for 2027: what actually changes for accountants and SMBsRESICO up to 5 million, Buzón Tributario fines, regularization and new limits on deductions. A clear summary of the 2027 Economic Package.3 min
  2. REPPayment complement (REP): when to issue it and what happens if it's missingWhen the electronic payment receipt is issued, the deadline to stamp it, why without a REP the VAT on PPD invoices cannot be credited and how to spot the missing ones.1 min
  3. Accounting firmsHow to handle 20 or more RFCs in an accounting firm without losing controlThe five tasks that take the most time at a firm with many clients and how to organize them: downloads, reviews, mailboxes, e.firmas and the team.2 min
  4. DIOTDIOT: how to file it and the mistakes that can get you finedWhat the DIOT is, who files it, what information it carries per supplier, the most common mistakes and the fine for filing it wrong or late.2 min
  5. CFDIAn invoice I already deducted was cancelled: what happens and what to doHow CFDI cancellation with the recipient's acceptance works, what happens to your deduction and creditable IVA if an invoice you received is cancelled, and how to correct it.2 min
  6. 69-BSAT's 69-B list: how to check whether your supplier is an EFOS and what to doWhat the 69-B list is, its four statuses (presumed, disproved, definitive, favorable ruling), how to check it and the 30-day deadline to correct.2 min
  7. Compliance opinionThe 32-D compliance opinion: how to get it and what each result meansWhat SAT's compliance opinion is, why you're asked for it, how to download it, what positive, negative, suspended and no obligations mean, and how to fix a negative one.2 min
  8. 2027 ReformTax regularization 2027: who can reduce fines and surchargesThe 2027 Federal Revenue Law (LIF) proposes reducing fines, surcharges and collection costs on debts from 2025 and earlier years. What we know and what to prepare.1 min
  9. RESICORESICO 2027: the cap rises to 5 million, is it worth it for you?The 2027 reform proposes raising the RESICO limit for individuals from 3.5 to 5 million pesos. Who wins, what doesn't change and what to review before deciding.2 min
  10. RMF 2027Miscellaneous Tax Resolution 2027: a summary for accountantsThe key points of the 2027 RMF for accountants and businesses: CFDI rules, deadlines, RESICO and Buzón Tributario. Updated as soon as it is published in the DOF.1 min
  11. CFDIBulk CFDI download with the e.firma: how it worksWhy SAT's bulk download requires the e.firma and not the CIEC, what gets downloaded, how long it takes and what happens to your e.firma when you connect it to Clauhub.1 min
  12. CFDIWhat to check in your CFDI every month: 6 alertsSix things SAT sees in your invoices that you probably don't: the 69-B list, the 69 list, cancellations, payments without a REP, the wrong regime and the DIOT. With their legal basis.2 min