Gardaí have confirmed they investigated serious allegations sent to them by a serving civil servant a number of years ago.
The allegations were received in 2007 and gardaí say they were fully investigated.
The investigation was conducted by the Garda Bureau of Fraud Investigation and RTÉ News understands that the complainant was interviewed by detectives.
A file was sent to the Director of Public Prosecutions.
The Garda Press Office said this evening if any new or further information on these matters is provided they will be fully investigated.
Earlier, a member of the Public Accounts Committee confirmed to RTÉ that a dossier alleging tax evasion by some politicians over a number of years had been given to the committee.
The Irish Times reported some details of the alleged scheme today.
Minister for Health Leo Varadkar said tax evasion by anyone is not acceptable and there can be no tolerance of it.
He said he himself is tax compliant and he felt sure the PAC will investigate further.
Mr Varadkar also said there is now legislation in place to protect whistleblowers.
Yesterday, members of the PAC received a letter and a dossier of allegations of substantial tax evasion by people, including senior politicians and at least one former judge, going back over 15 years.
The allegations were made by a serving civil servant who sent the dossier under the new Protected Disclosure of whistleblowing legislation.
He uncovered the alleged tax evasion in the course of his official duties.
The civil servant also makes serious allegations that senior ministers and a number of State agencies failed to fully investigate his findings.
PAC Chairman John McGuinness said he believes this is the first disclosure to the PAC under the new legislation, and as such, it is taking a cautious approach and taking legal advice.
That legal advice will be discussed next Thursday.
Asked whether he had any knowledge of the matter this morning, Minister for Public Expenditure and Reform Brendan Howlin said he knew nothing about it, apart from what he read in the paper.