Please refer to the tax authorities websites for further information.
UK:https://www.access.service.gov.uk/login/signin/creds
DE:https://www.bzst.de/EN/Home/home_node.html
FR: https://www.impots.gouv.fr/portail/
IT:https://www.agenziaentrate.gov.it/portale/web/english/nse/
ES:https://www.agenciatributaria.es/AEAT.internet/en_gb/Inicio.shtml
PL:https://www.gov.pl/web/national-revenue-administration/about-us