Blog · Guides on CFDI 4.0, SAT and electronic invoicing
Learn about electronic invoicing, SAT complements, and tax compliance in Mexico. Written by the Factura Digital team.
- Guides
- News
- Case studies
- API
What is CFDI 4.0 and how does it affect your invoicing in Mexico?
Complete guide to version 4.0 of Mexico's Digital Tax Receipt over the Internet: what changes vs 3.3, official dates, new SAT validations, and how to migrate without delays.
Carta Porte 3.1: a guide to issuing the complement without mistakes
Carta Porte 3.1 is the CFDI complement that covers the transport of goods across Mexican territory. Guide covering who must issue it, what changes vs 3.0, and how to avoid fines.
Payment Complement 2.0 (REP): when and how to issue it
The Payment Reception Complement version 2.0 is the CFDI that documents partial or total payments of invoices issued on credit. Guide covering when to issue it, SAT deadlines, and special cases.
How to issue a CFDI 4.0 step by step (2026)
Operational guide to issue a CFDI 4.0 from scratch: prerequisites, recipient data capture, line items, taxes and stamping with your PAC. Without skipping any mandatory field.
What is the SAT and how the CFDI system works
The SAT is Mexico's tax authority. We explain its role, the history of electronic invoicing in Mexico, what a PAC is and how a CFDI moves from issuance to the SAT.
PAC vs Multi-PAC: electronic invoicing architecture explained
A PAC certifies CFDIs on behalf of the SAT. But depending on a single one is a single point of failure. We explain what a multi-PAC architecture is, how failover works and why it's the difference between always invoicing and being stuck.
Start with 10 free stamps
Create your account with your tax certificate and CSD. No credit card.