VAT payers who do have a registered bank account at Equa Bank are obliged to inform the tax authorities on the change of bank account number due to the merger of Equa Bank into Raiffeisenbank. The notification must be made via submission of official application about the changes of registration details within 15 days from the day it occurred (https://www.financnisprava.cz/cs/financni-sprava/novinky/novinky-2022/informace-k-uctum-vedenym-u-equa-bank).
Source: leitnerleitner.com