The Finance Minister says Fine Gael's proposals to reform stamp duty are "daft" and will threaten thousands of jobs.
Brian Cowen says the main opposition party's policy is "poorly thought-through".
He claims their plans would threaten the value of everyone's house and not just those who are in the process of buying.
"It's obvious what's going to happen - it's just a badly thought through idea," he said.
"And it's being compounded now by the fact that the labour party are trying to cobble a joint policy arrangement with them on foot of that proposal, which seems to help people who are selling expensive houses," he said.