31 December 2022 sees the end of a crossover period where version 3.3 and version 4.0 can both be used, while version 4.0 is mandatory from 1 January 2023. Although not expressly mentioned in the Tax Treasury’s publication, the extension also permits the use of version 2.0 for payment supplements and proof of withholdings until 1 January 2023.
Source: auxadi.com
