The decisive factor is the basis under civil law (net or gross price agreement). In the case of statutory fees (lawyers, notaries, tax consultants, architects), the VAT is owed in addition. Thus, the new tax rates must be settled if the services are rendered in this period.
Hinweis
Die genannten Rz. beziehen sich auf das BMF-Schreiben vom 30.06.2020 a.a.O.
Merkblatt zur Umsatzbesteuerung in der Bauwirtschaft, BStBl I 2009, 1292