Sinn Féin is calling for an end to what it says are tax advantages and exemptions given to investment funds in the residential property market.
The party will tell the Dáil later increased taxes are needed to deal with funds bulk buying homes at the expense of ordinary individuals and families.
Last year funds bought 4,900 private rental properties at 32% above average asking prices, according to a recent report.
The party's finance spokesperson, Pearse Doherty, says they are having a detrimental impact on the Irish property market.
"They pay no tax on the rental income when they rent these properties out.
"And any gains that are made, any increase in value by the time they sell them, they also don't have to pay any tax on those gains that materialise.
"This allows these institutional funds to actually unleash huge fire power in terms of outbidding and pushing up prices for homes right across the city of Dublin - but also wider afield."
He says the Government needs to act.
"We want to ensure the fact that they pay no tax comes to an end, we want to make sure that the fact that they're exempt from CGT - Capital Gains Tax - that that comes to an end.
"We want to ensure that the Government provide adequate resources to local authorities to fund the forward-purchasing of apartment complex, where it's required.
"And we want to ensure that an appropriate level of stamp duty is applied on these institutional investors".
During a debate on the cost of living on Newstalk Breakfast, Sinn Féin's housing spokesperson Eoin Ó Broin says renting is more expensive now than in the Celtic Tiger era.
"€1,500 across the State is the average cost of renting now, 2,000 in Dublin.
"We have been screaming for years for the Government to ban rent increases.
"We're meant to have a rent cap of 2% - every single county, in terms of the latest Daft and the Residential Tenancies Board reports, show rents well in excess of that.
"All of the western seaboard counties have 20% rental inflation or more.
"And Dublin, despite having some flattening during COVID, is now seeing rent increases of 8 to 14%.
"The reality is it is far too expensive to rent - it is now more expensive to rent than it was at the height of the Celtic Tiger".
Additional reporting: Adrian Harmon
