According to the cited documentsOperating and living
From its portal SAT offers online 'Solicitar NIT' (request a tax ID) (portal.sat.gob.gt/portal/solicitud-electronica-de-nit/), 'Cita para concluir la solicitud de NIT' and 'Agendar mi cita' (appointments), the RTU (taxpayer register) processing status, the Agencia Virtual (with password recovery and processing status) and the 'Requisitos de inscripción' page for individuals and companies (portal.sat.gob.gt/portal/requisitos-de-inscripcion-personas-empresas/). The ICS 2024 lists registration with SAT among the mandatory registrations that follow commercial registration.