Regulatory Bodies
Mexico's Servicio de Administración Tributaria, equivalent to the IRS.
SAT (Servicio de Administración Tributaria) is the Mexican federal agency under SHCP responsible for collecting federal taxes (ISR, IVA, IEPS), enforcement, and CFDI administration. It defines tax regimes (RESICO, Actividad Empresarial), publishes vehicle-expense deduction rules, and runs the CFDI 4.0 portal. Site: sat.gob.mx.