Answer
Due to the implementation of CRS and FATCA in the Dutch legislation, DEGIRO is obliged to provide the Dutch tax authorities information on its clients and their accounts. The following information may be shared (of private individuals):
Name and address;
Tax residence country and tax identification number;
Date of birth and place of birth;
Username;
Account balance at year end;
Gross amount of interest, dividend and other income;
Gross sale proceeds.