1. Without prejudice to its reporting obligations under Regulation (EU) No 1024/2013, the ECB shall by the end of each calendar year calculate the estimated annual costs in respect of the fee period for the following calendar year.
2. Within four months after the end of each fee period the ECB shall determine the actual annual costs for that fee period.
3. The estimated annual costs and actual annual costs shall serve as a basis for the calculation of the total amount of the annual supervisory fees referred to in Article 9(1).