Minister for Finance Mr McCreevy will today face a motion of no confidence tabled by Fine Gael.
The debate on Mr McCreevy's performance comes just prior to the publication of the Book of Estimates and what is expected to the toughest Budget in years.
Fine Gael leader Mr Enda Kenny said Mr McCreevy has been found out. "Spending is now €1 billion ahead of the Budget day targets. Tax revenues are €1.3 billion below target. Even the manager of the local Christmas club could recognise that as a crisis," he said.
Mr Kenny accused Mr McCreevy of allowing public spending to rise at more than 20 per cent a year, and of not knowing how much his tax concessions cost."He also fooled himself and conned the country with accounting sleight of hand," the Fine Gael leader said.
The Labour Party is expected to support the no-confidence motion.