CFDI and electronic accounting in SAP: what your system must cover

In Mexico, complying with the SAT (tax authority) is not a separate module: it runs through sales, purchasing, treasury and accounting. That's why tax issues in SAP are almost always configuration or master data issues.

1. Issuing CFDI 4.0

Check that your customers have their RFC (tax ID), legal name, tax regime and postal code exactly as they appear on their tax status certificate. It's the most common cause of stamping rejections.

2. Payment complement

Invoices issued with the installment or deferred payment method (PPD) require a payment complement when they are collected. If your team issues it outside SAP, your receivables and the SAT probably don't match.

3. Receiving supplier invoices

Validating received CFDIs against the SAT before posting them prevents deducting canceled invoices or invoices with wrong data. Automating this step saves hours of data entry every month.

4. Electronic accounting

Your chart of accounts must be mapped to the SAT grouping code, and SAP must be able to produce the trial balance and, when requested, the period's journal entries in the required format.

5. DIOT

The DIOT (report of operations with third parties) is built from the VAT actually paid to suppliers. If payments aren't properly linked to their invoices, the report comes out incomplete and reconciliation becomes manual.

Warning sign

If your accounting team spends days every month reconciling SAP against the SAT portal, the system isn't doing its job. We can review your tax localization and tell you where the difference is.