Staff numbers have risen by 840 in the past year and wages have gone from a forecast $513 million to $670 million in the first two years of the Super City.
This has prompted councillor Cameron Brewer to blame Mayor Len Brown for the "worrying" figures and brought murmuring in senior levels that chief executive Doug McKay is not doing enough to control staff numbers and costs.
"The mayor likes to give the impression that he's reduced staff numbers, but the reality is we're seeing the numbers creep up," Mr Brewer said.
The Super City began in November 2010 with 7478 staff and 729 vacancies - an allowance of 8207 staff. This was about 1200 fewer staff from the 9430 of the former eight councils.