The Federal Tax Administration FTA will not be available on December 25 and 26, 2023 and on January 1 and 2, 2024.
Due to the year-end closing, the FTA services in the ePortal will not be available from December 30, 2023 to and including January 2, 2024. VAT reports can be submitted again from January 1, 2024 (presumably from 8 a.m.).