Brisbane Labor Councillor David Hinchcliffe says according to his calculations, which are based on the Council's budget figures, rates on some inner-city apartments will rise by up to 700 per cent.
But Lord Mayor Campbell Newman has rejected such figures.
"There have been some significant increases for a small number of properties around the CBD and CBD frame," he said.
"Typically the increase... for the hardest-hit people is around about 150 to 160 per cent."
"The worst increase for any unit in the whole of the city of Brisbane is 300 per cent."