Aardaí say they have already investigated allegations of tax evasion by senior politicians between the 1970s and 1990s.
A spokesman said the force has already "fully investigated" the allegations presented to it, and a file was sent to the DPP.
Meanwhile the Department of Jobs insists a witness statement from a whistleblower doesn't contain any new information.
And it's denied that the minister Richard Bruton, pictured, has ignored the evidence from the whistleblower, Gerry Ryan.
Today's Irish Times reports that Mr Ryan was asked to give a witness statement to the Garda Bureau of Fraud Investigation about his allegations, and that he passed this to the Department in 2012 - but that minister Richard Bruton, to this day, has failed to pass it on.
The Department denies those claims. Today it pointed to a statement released by the minister on Saturday, where he said the statement was still bring prepared.
He said it was still being finalised to make sure it complies with certain laws, but that it would be finished and sent to Gardaí shortly.
In that statement, Minister Bruton also said the witness statement did not include anything that hadn't already been investigated by the Gardaí.
If this is true, that would suggest there's little more that the Gardai can do about these allegations.
Although Gardai haven't yet been given the most recent dossier, this lunchtime a spokesman said Gardaí received allegations of tax evasion by politicians in 2007.
It said they were fully investigated at the time and a file was sent to the DPP - and that while any new evidence will be investigated, that's where the Garda involvement ends. for the time being.
PAC to consider evidence on Wednesday
But the next twist could come on Wednesday, when the Public Accounts Committee decides whether to investigate the claims itself.
That's looking more and more likely - meaning a series of ministers could be called in to account for how they handled allegations about some of their own party colleagues.
There is a growing school of thought that because the whistleblower's concerns relate to how the allegations were treated before now, the latest batch of allegations should be investigated by a body which has not yet considered them.
As it's believed the allegations have already been passed to Gardaí, the Director of Corporate Enforcement, the Revenue Commissioners, the Garda Fraud Bureau and two different Tribunals, the PAC may be the only forum left to investigate.
It will have to examine the actions of a series of ministers from three different political parties between 1997 and the current day.
Mary Harney was the Minister in charge of the Department from 1997 until September 2004, shortly after the allegations were first brought to light, and partly substantiated by the McCracken Tribunal.
In the final months of her tenure she directed Gerry Ryan to conclude his investigations, and to pass on his findings to the appropriate bodies.
She confirmed in the Dáil a year later that Gerry Ryan had disagreed with her at the time, and wanted to continue the investigation.
In the meantime she had been succeeded by Fianna Fáil's current leader Micheal Martin.
A Fianna Fáil source said the whistleblower had sought a meeting with Micheal Martin a few weeks after he took over the Department.
He met him in January 2005, and appointed Matthias Kelly - a well-known and highly-respected QC - the next month to assist Gerry Ryan in bringing them to a conclusion.
Later that year, files were then passed on to a range of bodies - including the Gardaí, the Director of Corporate Enforcement, the Revenue Commissioners and the Mahon and Moriarty Tribunals.
Micheal Martin was later succeeded by his Fianna Fáil colleagues Mary Coughlan, Batt O'Keeffe and Mary Hanafin, before the change of government which saw Richard Bruton sent to the Department in 2011.
All of those former ministers could be among those called to give evidence if the PAC decides to undertake its own inquiry.
