6.When the audited accounts for 2021 become available, trade repositories referred to in paragraph 1 shall report to ESMA the indicators referred to in Article 3(1) for 2021.Trade repositories shall be charged any difference between the annual supervisory fee for 2021 actually paid and the annual supervisory fee that would have been due for 2021 if the calculation of the applicable turnover had been based on the indicators reported pursuant to the first subparagraph.ESMA shall send the invoice for any additional payment pursuant to the second subparagraph at least 30 days before the respective payment date.