The head of the Irish trade union movement has admitted the public sector allowance system is outdated.
Irish Congress of Trade Unions general secretary David Begg said public sector pay scales need to be addressed to update the system.
He warned pay structures should be refashioned in a more logical and sensible way.
"That's a matter for the employers and the unions and public service to do over a period of time," said Mr Begg.
Public Expenditure and Reform Minister Brendan Howlin said he strongly agreed with the congress boss, adding he had already called for an overhaul of the way in which public servants are paid.
He made the claim less than a week after he announced his department had failed in its target to save 75 million euro in a slash and burn of public sector pay bonuses.
Only one of 1,100 allowances for existing staff could be scrapped - a 218 euro representational allowance for staff attending European Union meetings.
That saved 3.5 million euro of the original 75 million euro targeted.
Around 30% of Government spending goes on pay - an estimated 15.4 billion euro.
Public servants, including school principals, gardai, doctors and nurses, are given allowances on top of their salary. This includes bonuses for working bank holidays and unsociable hours, and travel expenses.