TVNZ chief executive Kevin Kenrick says employees may have to declare any links with a political party as a result of Labour hopeful Shane Taurima's actions while general manager of its Maori and Pacific unit.
But TVNZ's existing guidelines for journalists already advise that and warn against situations similar to that when Mr Taurima was rehired at the state broadcaster last year.
Mr Taurima resigned last month when it was revealed he had been involved in organising a Labour Party fundraising hui at the TVNZ network centre, had participated in other Labour hui and was considering seeking the Labour nomination to stand in the Tamaki Makaurau electorate this year.
That was despite his assuring TVNZ management that he had no further political aspirations when he was rehired after unsuccessfully seeking Labour's nomination for the Ikaroa-Rawhiti byelection.
TVNZ has begun an inquiry into whether there was Labour bias at the unit under Mr Taurima, whether the state-owned company's resources were used for political events and whether there was any bias during his role as an interviewer on Q+A.