Your Mexican sale was declined and the customer had the money: what changed in 2026

Why Mexico stopped being a card market, how SPEI works, and the automatic limit now declining transfers from anyone who never configured it.

Pagnovo Team · 2026-08-13

There is one decline that confuses everybody: the Mexican customer has the money, the account is in order, no fraud signal — and the transfer does not go through. Since January 2026 this has become far more common, and the cause is not in your checkout.

First: Mexico is no longer a card market

Anyone building a Mexican operation from the Brazilian playbook makes the same mistake twice: they assume cards will do. They will not. SPEI — the interbank transfer system run by the Bank of Mexico — already moves more money than cards in the country.

SPEI settles between banks in seconds, runs 24 hours a day, 365 days a year, and is addressed by CLABE, an 18-digit number identifying the account.

Insisting on international cards alone for a Mexican sale costs you on three fronts at once:

The caveat almost nobody mentions about SPEI

SPEI runs continuously — but each bank keeps its own crediting hours. So the system is up 24/7, and yet a transfer made outside the receiving bank's operating window may take a while to show up for the beneficiary.

This matters if you release orders automatically on confirmation: confirmation happens, but the time to reach it is not uniform across banks. Better to account for that in your order messaging than to promise "immediate release" without qualification.

What changed in 2026: the MTU

Here is the news that explains a good share of the unexpected declines.

The Bank of Mexico created the MTU — Monto Transaccional del Usuario, a transfer limit set by the account holder themselves. It became available in October 2025 and turned mandatory on 1 January 2026.

The detail that creates the problem: anyone who never configured their own MTU was given an automatic cap. That default ceiling is 1,500 UDIS per transaction — roughly MXN 12,800.

Translated into your funnel: a meaningful share of Mexican consumers never opened their bank's configuration screen and are therefore operating under a limit they did not choose and most likely do not know about. If your ticket runs above that, the transfer is declined on a limit, not for lack of funds — and the customer has no idea why.

What to do with this

1. Find out whether your ticket brushes the ceiling. If the product costs more than ~MXN 12,800, the problem will show up. Comfortably below it, you are fine for now.

2. Explain the decline in the right place. A checkout message, in Spanish, saying the limit can be adjusted in their own banking app recovers part of the loss. Customers do not know they can change it.

3. Offer a second route. Traditional bank transfer remains available for high tickets. Having a single method is what turns a limit into a lost sale.

4. Consider splitting the charge. For high recurring tickets, smaller instalments keep each operation under the ceiling.

5. Measure approval by method and by amount band. It is the only way to see this kind of loss. Average approval hides it: the problem concentrates in one specific band.

The underlying mistake

Treating Mexico as "one more country where we accept cards". Every market has its own payment system, with its own rules that change without warning for outsiders. SPEI is mature, fast and dominant — but it has a new rule that quietly kills sales for anyone unaware of it.

At Pagnovo, Global Processing in Mexico accepts SPEI and bank transfer, settling in local currency, PIX or crypto. If you are building a cross-border operation, see also why accepting international cards is not enough or talk to our team.