Revenue has advised that this year's surge in corporate tax receipts is sustainable and can be included in forecasts going forward, Finance Minister Michael Noonan said today.
Almost 8% more tax has been collected than had been expected so far this year, driven by corporation tax receipts.
This has helped the Government cut its budget deficit but also prompting warnings that it should not spend gains that could quickly disappear.
Mr Noonan said the Office of the Revenue Commissioners, which assesses and collects taxes, told his department that the increase in corporation tax was very broadly based, came from a number of sources and was seen across all sectors.
"They think it's sustainable and they said there shouldn't be any concern about putting it in for the tax base for next year," Mr Noonan said.
"But we have been wrong in our forecasts (in the past), we're not taking any risks with the forecasts. If more money comes in we'll do what we're doing this year and take it off the deficit," the Minister added.
The Government had expected to take in €4.6 billion in corporate tax in 2015 but already running €2 billion ahead of target, it could return to the peak of €6.7 billion that was collected in 2006, before the financial crisis began.
Corporate taxes, much of which Ireland draws from its large cluster of multinational firms such as Apple - which announced 1,000 new jobs in Cork today - have represented over 13% of the entire tax take this year compared to 11% in 2014.
The Government used most of the tax windfall for this year on additional spending despite a warning from the Central Bank Governor against basing spending commitments on tax gains.
Other analysts have urged the Government to heed the lessons of Ireland's property crash when stamp duty was used to reduce rates of income tax during the boom, a policy that had to be reversed quickly and painfully during the bust.
Meanwhile, Michael Noonan also said today that he does not expect European Union regulators to issue a decision on the country's tax deal with Apple until after Christmas.
Earlier this week, Mr Noonan had said that a decision was expected before Christmas.
But yesterday the Government got "some low level information that it probably wouldn't come until after Christmas," the Finance Minister said.
Mr Noonan, who has expressed confidence in the past that Ireland would be cleared of any wrongdoing, said the Government did "not have a straight read" of what the ruling would be.
He added that he did not want to be seen as prejudicing the decision.