Consortium buying — multiple RFCs, one order

When the group wants to buy as a group, without losing control per company

Consortium buying is common in Mexico: industrial groups clustered around COMCE or CONCAMIN, chambers like CANACINTRA or COPARMEX, dealer associations, and holdings with several legal entities that share a procurement function. The operating promise is attractive —better price for volume, one supplier, one negotiation— but the fiscal and logistics complexity is not trivial. Each company wants its own invoice, its own cost center, and, in many cases, its own delivery.

At Corp-Merch Mexico we run the consortium model with three layers. The first is the commercial negotiation, where the lead buyer of the group signs a master agreement with us, locks total volumes per category, and fixes the price. The second is invoicing, where each consortium participant gets its own CFDI 4.0 with its RFC, fiscal address, and, when applicable, its Carta Porte 3.0 complement if the goods cross state borders. The third is delivery, which can be centralized to a warehouse of the lead buyer or split among the group members according to pre-agreed addresses.

For the model to work, the lead buyer hands us at contract start a roster of participants with RFC, legal name, fiscal and delivery address, and accounts payable contact for each. We validate the roster against the SAT to rule out inconsistencies that later block electronic invoicing. When a participant changes address or leaves the roster, we update it through a signed addendum and notify the SAT when the change is substantial, within the timeframe set by the current RMF.

There is a special case that comes up in chambers and associations: the participant without an active RFC. An academy, a professional college, or a small civil association may not hold an RFC active for invoicing. In that scenario we operate with a third-party operation receipt, where the lead buyer absorbs the corresponding VAT and we issue the CFDI 4.0 to their name with the third-party operations complement. This is consistent with what the SAT requires in the CFDI 4.0 filling guide and removes the risk of a later audit observation.

For holdings with a fiscal address in one state and operating warehouses in others (say, a parent in Polanco with distribution centers in Guadalajara and Monterrey), we issue the CFDI 4.0 to the parent's fiscal address and the Carta Porte 3.0 to each delivery destination, so the transit is correctly supported for foreign trade complement purposes when applicable. If the goods cross the northern border, we add the temporary or definitive import pedimento according to the customs regime of the participant.

One piece that has grown through 2024 and 2025: group buying for MSMEs through promotion programs. If your chamber or organization participates in a consolidated purchasing program backed by development banking or NAFIN, we adjust the quote to the format the tender requires, with unit breakdown, VAT, and, when the tender asks for it, national content indicators. The last point matters because several Mexican public purchasing programs grant additional score to merch that proves a minimum percentage of national integration, and our file carries it broken down by input.

The last friction point in consortia is collections. We run two routes: centralized, where the lead buyer pays the total invoice and each participant pays them according to their consumption (most common in holdings with centralized treasury), or decentralized, where each participant pays their own CFDI under their credit line. In both cases we send the consolidated account statement every Monday so the lead buyer's accounts payable area has visibility without having to request ad-hoc reports.

One operational detail we insist on with every consortium: the change-control calendar. Participant rosters shift during the year, fiscal addresses change when a branch moves, and credit lines expire. We schedule a quarterly review with the lead buyer to refresh the roster, validate RFCs and CSVs (constancia de situación fiscal) against the SAT, and reconcile any discrepancy in billing entities. The review is short —typically forty-five minutes— and saves the consortium from the disputes that show up when an invoice lands at the wrong RFC because the registry was stale.