The competent fiscal authorities are equally responsible for handling questions concerning the foreign resident tax. Alternatively, you may contact the Central Federal Taxation Office (BZSt), at: www.bzst.bund.de . Under the terms “Mandatory tax deduction and exemption procedures“, you will find information about the Income Tax Act, double taxation treaty etc. along with various forms. The office in Berlin is located at: Bundeszentralamt für Steuern (Central Federal Taxation Office) DGZ-Ring 12 13086 Berlin Phone: (01888) 406 - 0 Fax: (01888) 406 - 3710 poststelle-berlin@bzst.bund.de Postal address: Bundeszentralamt für Steuern, 11055 Berlin.