The Dáil approved legislation to give and extra €16,000 allowance to three junior ministers last week.
The three 'super junior' ministers are Fianna Fáil's Chief Whip Jack Chambers, Fine Gael Minister of State for Climate Change and Transport Hildegarde Naughton and Green Party Minister of State for Agriculture Pippa Hackett.
PAC chairman Brian Stanley says the government's spending is outrageous, and he says the committee should look into it.
"PAC has to oversee public spending, how the public purse is managed, do tax payers get value for money and the committee will decide in due course the matters that we are going to examine.
"For my part, I want us to be very active to make sure that where there is awful waste of public money that we do that."
