Salary hikes ... Prime Minister Julia Gillard with the head of her department Dr Ian Watt, left, will receive significant raises.

Salary hikes ... Prime Minister Julia Gillard with the head of her department Dr Ian Watt, left, will receive significant raises. Photo: Andrew Meares

All 21 heads of federal public service departments will be on salaries of at least $650,000 by 2014.

The salary package of the most senior public servant, the head of the Department of the Prime Minister and Cabinet, will increase by more than $200,000 before July 1, 2014, from $620,000 to $825,000.

The Remuneration Tribunal has also awarded a $180,000 boost to the salary of the secretary of the Treasury over that same period from $615,000 to $805,000.

The national secretary of the Community and Public Sector Union, Nadine Flood, said that there was ''no doubt that agency heads do complex jobs and should be paid appropriately''.

''However, for the thousands of Australian public service staff who earn, on average, less than $60,000 a year and are facing yet another round of job losses and budget cuts, these increases seem a bit rich,'' Ms Flood said.

She said frontline staff felt they were ''copping the brunt of the cuts while agency heads get the big rewards. It's pretty clear different standards apply to public service chiefs and their staff''.

The independent tribunal's decision on the pay packets of public service heads also opens up a big gulf between the pay of the heads of the biggest departments - such as Treasury, defence and foreign affairs - and the heads of other departments such as communications, immigration and the Attorney-General's Department.

There is now a difference of $50,000 between the salary package of the head of the Prime Minister's Department and the head of one of the departments in the lowest pay bracket. But by July 2014 the difference will be $175,000.

A departmental head's base salary is now 72 per cent of their package. This will drop to 70 per cent in 2014, the difference made up by superannuation, vehicle allowances and travel entitlements. Because of budget cuts, many departments no longer pay their top bureaucrats a bonus.

''We are not seeing a consistent approach across the top levels of the public service,'' Ms Flood said.

The pay of public service chiefs puts them in the league of the heads of large private companies.

The head of the Australia Institute, Richard Denniss, said it now took public service chiefs less than 10 days to earn the amount of money a recipient of unemployment payments now earned in a year.

''No one is suggesting that we don't need highly capable people at the top of the public service but there's no evidence that paying departmental secretaries more than $500,000 per year is going to make them work harder or smarter,'' he said.