The TPA Horwath Group is one of the leading tax advisory and auditing services companies in Central and South Eastern Europe. 11 Countries. 1 Company. More than 1,000 employees work for the TPA Horwath Group at 26 offices in Albania, Austria, Bulgaria, Croatia, the Czech Republic, Hungary, Poland, Romania, Serbia, Slovakia and Slovenia. TPA Horwath services include tax advisory, accounting, auditing and advisory in CEE/SEE.