TPA in Bulgaria Our office in Bulgaria, based in Sofia, offers services in the fields of Accounting, Tax Advisory, Business Consulting and Audit. Our work is characterized by the highest quality, continuous improvement of our know-how and attention to the needs of our clients. The TPA Group The TPA Group is one of the leading tax advisory and auditing services companies in Central and South Eastern Europe.More than 1,000 employees work for the TPA Group at 27 offices in Albania, Austria, Bulgaria, Croatia, Czech Republic, Hungary, Poland, Romania, Serbia, Slovakia and Slovenia.