Podcast — Episode 1: CFDI 4.0 for merch
This is the pilot episode of the Corp-Merch.MX podcast. In each episode we talk with a sector expert about an operational topic that affects corporate merch professionals in Mexico. In this first episode we sit down with a certified public accountant specialized in foreign trade to discuss CFDI 4.0 applied to merch operations: which mistakes we see most often, what to validate before accepting an invoice and how to design an accounts-receivable flow that minimizes fiscal risk. The conversation is thirty-two minutes long and is available in audio plus an edited transcript.
About this episode
The episode was recorded at the Corp-Merch.MX offices in Mexico City during a forty-five-minute session edited down to thirty-two for the podcast. The guest is Lucía Mendoza, a certified public accountant with fifteen years of experience in foreign trade and the IMMEX regime, specialized in manufacturing and services companies. Lucía has supported more than eighty corporates through SAT audits and through the implementation of internal controls for electronic invoicing.
The topics covered are: the structure of CFDI 4.0 applied to merch, the most common errors we see in invoices from workshops and logistics suppliers, the validation of the 69-B blacklist and the positive compliance opinion, the correct use of PPD with payment complement, the Carta Porte 3.0 when goods travel by road, and the five points every company should review before accepting an invoice.
What you will learn
Five concrete operational ideas. The first is that not every invoice with a SAT stamp is tax-deductible: if the supplier is on the 69-B blacklist, the invoice is automatically voided and the expense becomes non-deductible even when every field is correct. The second is that the use of CFDI is the client's decision, not the supplier's: if the supplier defaults to G03 and you need G01, you have to ask for it before the invoice is stamped.
The third is that PPD without a payment complement is a problem: if you issue PPD and never issue the complement when you pay, the SAT interprets the invoice as still pending collection — both for the supplier and for you. The fifth is that validating the supplier before signing a contract takes five minutes and avoids serious problems. The validation is done on the SAT portal with the supplier's RFC and the evidence is kept for future audits.
Edited transcript: the highlights
(00:00) Corp-Merch.MX: Welcome, Lucía. Why does merch-sector invoicing have particularities that a general accountant does not always handle?
(00:42) Lucía Mendoza: The main particularity is that the sector works with workshops that are often informal or small businesses without robust tax infrastructure. So you see invoices issued with errors you would not see in other sectors: incorrect RFC, outdated fiscal address, use of CFDI that does not match the operation.
(03:15) Corp-Merch.MX: What is the error you encounter most often?
(03:22) Lucía Mendoza: PPD without payment complement. The corporate pays at thirty days, the workshop emits PPD, and at month-end nobody emits the complement. After six months, the SAT sees a hundred PPD without complement and considers those revenues still pending for the workshop — and for the corporate too. It is a problem avoided with operational discipline.
(12:30) Corp-Merch.MX: How do you validate a new supplier?
(12:48) Lucía Mendoza: I run four checks. The 69-B blacklist on the SAT portal. The positive compliance opinion — if the supplier is not up to date, their invoice is not deductible. The fiscal address in the SAT padron — it has to match the actual address. And the constitution of the company — if it was created two months ago, I want to understand why.
(22:10) Corp-Merch.MX: What about Carta Porte 3.0?
(22:18) Lucía Mendoza: Mandatory when the merchandise travels by road beyond the urban zone. Without the Carta Porte, the transfer does not exist for the SAT and the IVA on logistics is not creditable. Many corporates skip this when the carrier is a small freight company, and that costs them on the next audit.
(28:45) Corp-Merch.MX: One piece of advice for someone starting to invoice merch.
(28:53) Lucía Mendoza: Build the chart of accounts around the operation. Each merch project should have a code, a CFDI series and a clear link to the payment complement. When the chart of accounts reflects what the company actually does, the invoicing follows naturally. When it does not, every invoice is an exception.
Listen to the next episode
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Lucía Mendoza is a fictional persona created for editorial purposes. The opinions, criteria and frameworks described do not represent any real person or company. The transcript was edited for clarity and is published under editorial license. Corp-Merch.MX has no commercial, equity or sponsorship relationship with any accounting firm mentioned in this episode.