The Government could set up a site valuation tax quickly, with an average charge of €625 per household, an economic workshop in Dublin has been told.
Economist Ronan Lyons said the tax would raise about €3bn a year in revenue.
He said that 80% of the information required to set up a tax system, based on an annual charge of 2% of the land value, already exists and could be used to levy a new tax.
Under the system, he said those living in Dublin would pay the most, while those living in rural areas would pay the least, because of the relative values of land in different parts of the country.
The Campaign Against Household & Water Tax, which is being led by a number of Independent and United Left Alliance TDs, has voiced its opposition to the proposal.
It said a site valuation tax would ''hit precisely the people most suffering with debt and inflated mortgage payments'' and would be unfair as land value did not relate to people's ability to pay.
The group said any moves to introduce such a charge would be ''vehemently opposed'' by its members.
