Mexico’s e‑invoicing regime, governed by the CFDI XML format (Anexo 20, version 4.0), applies universally to all taxpayers and covers B2B, B2C, and B2G transactions with no turnover threshold. The 2026 tax reform tightens authenticity checks, expands SAT enforcement powers, and imposes fines of 5–10 % of invoice value for non‑compliance.