Spain. AEAT is out tax authority and has begun using AI in recent years, as an early adopter. The Spanish government in general seems very favorable towards AI and it’s funding a nationally trained model.

https://sede.agenciatributaria.gob.es/Sede/en_gb/gobierno-abierto/transparencia/informacion-institucional-organizativa-planificacion/inteligencia-artificial.html?faqId=376c6e2f72610910VgnVCM100000dc381e0aRCRD