The Moriarty Tribunal is due to publish its report today into the finances of the late Charles Haughey.
The report will deal with millions of euros in payments received by the former Taoiseach between 1979 and 1996 from various identified and unidentified sources.
It is expected to draw a link between a £50,000 payment he received from a wealthy Saudi sheikh in 1985 and his support for Irish passport applications from a number of Middle Eastern nationals.
However, reports this morning say the tribunal has been unable to identify any other significant favours received by any of the known donors.
Elsewhere, the tribunal is expected to conclude that Mr Haughey used money from the Fianna Fáil party leader's account and from Brian Lenihan's medical treatment fund for his own personal gain.
The consequences for Mr Haughey's family could be significant because the report is expected to find that the former Taoiseach was unco-operative, meaning the tribunal could recoup some legal costs from his estate.