TAOISEACH Enda Kenny has warned that the Revenue will pursue up to 160,000 householders who have not registered for the property tax.
He welcomed the fact that 1.5m households out of the 1.66m who were sent property tax letters have signed up so far ahead of today's extended 8pm deadline.
But Mr Kenny made it clear that the Revenue would pursue those who had not registered.
"Clearly the Revenue Commissioners have the authority and the power and the backing of Government to see that those who don't contribute do so," he said.
Mr Kenny said that people had been surprised at the ease of the options they had in paying the property tax, and also at the flexibility in determining which valuation bands their house was in.
"I commend Josephine Feehily and her team in the Revenue for the extraordinary work they have done with such competence in such a short time," he said.
Mr Kenny was speaking after opening the Irish Sport headquarters in Abbotstown in West Dublin - the planned site of the cancelled "Bertie Bowl" stadium.